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Ricoh A741 Service Manual

Wide format copier

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A741

SERVICE MANUAL

PN: RCSM7030

RICOH GROUP COMPANIES

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Page 1 ® ® ® A741 SERVICE MANUAL PN: RCSM7030 RICOH GROUP COMPANIES...
Page 3 ® ® ® RICOH GROUP COMPANIES...
Page 5 A741 SERVICE MANUAL PN:RCSM7030...
Page 7 It is the reader's responsibility when discussing the information contained within this document to maintain a level of confidentiality that is in the best interest of Ricoh Corporation and its member companies. NO PART OF THIS DOCUMENT MAY BE REPRODUCED IN ANY...
Page 9 LEGEND PRODUCT COMPANY CODE GESTETNER RICOH SAVIN A741 FW7030D DOCUMENTATION HISTORY REV. NO. DATE COMMENTS 12/98 Original Printing...
Page 11 CAUTION DANGER OF EXPLOSION IF BATTERY IS INCORRECTLY RE- PLACED. REPLACE ONLY WITH THE SAME OR EQUIVALENT TYPE RECOMMENDED BY THE MANUFACTURER. DISPOSE OF USED BATTERIES ACCORDING TO THE MANUFAC- TURER’S INSTRUCTIONS. ATTENTION IL Y A DANGER D’EXPLOSION S’IL Y A REMPLACEMENT IN- CORRECT DE LA BATTERIE.
Page 13: Safety Precautions
Safety precautions This booklet provides safety warnings and precautions for our service personnel to ensure the safety of their customers, their machines as well as themselves during maintenance activities. Service personnel are advised to read this booklet carefully to familiarize themselves with the warnings and precautions described here before engaging in maintenance activities.
Page 14 Safety warnings and precautions Various symbols are used to protect our service personnel and customers from physical danger and to prevent damage to their property. These symbols are described below: DANGER: High risk of serious bodily injury or death may result from insufficient attention to or incorrect compliance with warning messages using this symbol.
Page 15: Installation Precautions
indicates that action is required. The specific action required is shown inside the symbol. General action required. Remove the power plug from the wall outlet. Always ground the copier. 1. Installation Precautions WARNING • Do not use a power supply with a voltage other than that specified. Avoid multiple connections to one outlet: they may cause fire or electric shock.
Page 16: Specifications 1
• Always handle the machine by the correct locations when moving it..• Always use anti-toppling and locking devices on copiers so equipped. Failure to do this may cause the copier to move unexpectedly or topple, leading to injury................•...
Page 17 • Check that the power cable covering is free of damage. Check that the power plug is dust-free. If it is dirty, clean it to remove the risk of fire or electric shock..................• Never attempt to disassemble the optical unit in machines using lasers. Leaking laser light may damage eyesight.
Page 18 • After maintenance, always check that all the parts, screws, connectors and wires that were removed, have been refitted correctly. Special attention should be paid to any forgotten connector, trapped wire and missing screws..................• Check that all the caution labels that should be present on the machine according to the instruction handbook are clean and not peeling.
Page 19: Table Of Contents
Rev. 01/2001 CONTENTS THEORY AND CONSTRUCTION SECTION 1-1 Specifications 1-1-1 Specifications ................1-1-1 1-2 Handling Precautions 1-2-1 Handling and storage of the drum ..........1-2-1 1-2-2 Storage of developer and toner ............1-2-1 1-2-3 Handling of the heaters ..............1-2-1 1-2-4 Storage of paper ................
Page 20: Troubleshooting
Rev. 02/2000 3-3-6 Transfer/separation section 3-3-37 3-3-7 Cleaning section 3-3-42 3-3-8 Fixing section 3-3-48 3-3-9 Other sections 3-3-60 3-4 PCB Initial Settings 3-4-1 Main PCB 3-4-1 3-4-2 Non-field-adjustable volume controls 3-4-3 3-5 Self Diagnostics 3-5-1 Self-diagnostic function 3-5-1 3-6 Troubleshooting 3-6-1 Image formation problems 3-6-1 3-6-2 Paper misfeeds...
Page 21 THEORY AND CONSTRUCTION SECTION...
Page 23 CONTENTS 1-1 Specifications 1-1-1 Specifications ..................1-1-1 1-1-5...
Page 25: Specifications
1-1-1 Specifications Type …………………………… Console type Copying method ……………… Dry indirect electrostatic photocopying Original type …………………… Sheet Original feed method ………… Moving originals Paper …………………………… (1) Plain paper: 64 – 80 g/m (fed from the roll unit or bypass table) (2) Special paper: Tracing paper, film (fed from the roll unit or bypass table) Roll paper size …………………...
Page 26 340-1 Photoconductor ……………… OPC (Drum diameter: 90 mm) Charging system ……………… Single plus corona charging Drum surface potential: 870 ± 50 V DC Exposure system ……………… Moving original scanning Light source …………………… Fluorescent lamp, 65 W Developing system …………… Dry (magnetic brush) Developer: Dual-component (ferrite carrier and black toner: N22T) Toner density control: Toner sensor...
Page 27 Accessories …………………… Original reversing guide Optional accessories ………… 3rd roll unit, roll shaft, carrier sheets (A0, A1, A2), key counter and original support 3rd roll unit (optional) Type …………………………… Built-in type Paper …………………………… Equivalent to the copier to be connected to Power source …………………...
Page 29: Handling Precautions
CONTENTS 1-2 Handling Precautions 1-2-1 Handling and storage of the drum ............1-2-1 1-2-2 Storage of developer and toner ............1-2-1 1-2-3 Handling of the heaters ............... 1-2-1 1-2-4 Storage of paper ................. 1-2-1 1-1-7...
Page 31: Handling And Storage Of The Drum 1
1-2-1 Handling and storage of the drum Use the following caution when handling the drum. • When removing the drum from the main unit, make sure not to expose it to direct sunshine or strong lighting. • Store the drum where the ambient temperature is kept between –20°C/–4°F and 40°C/ 104°F and humidity around 85%RH.
Page 33: Mechanical Construction
CONTENTS 1-3 Mechanical Construction 1-3-1 Part names and functions ..............1-3-1 1-3-2 Copy process ..................1-3-3 1-3-3 Machine cross sectional view ............. 1-3-3 1-3-4 Machine drive system ................. 1-3-4 (1) Drive system 1 (driven by the paper feed motor) ......1-3-4 (2) Drive system 2 (driven by the paper feed motor) ......
Page 35: Part Names And Functions 1
1-3-1 Part names and functions ˆ & · ˆ „ ° ﬁ › Á ‰ ¨ ˇ ´ ‚ ‡ Œ ﬂ Figure 1-3-1 1 Main switch ! Original table ) Original holding section ‚ Roll unit handle 2 Total counter @ Original loop guide ⁄...
Page 36 340-3 Metric Inch ‡ ﬂ ﬁ ‡ ﬂ ﬁ Added Features ‹ Fusing ‹ Paper Temp. ° ° Adjusted Toner Memory · · Recall › Mainte- › nance ‚ ‚ Synchro Full Size Interrupt Œ Paper Œ Length Memory Leading Leading Copy Edge...
Page 37: Copy Process 1
1-3-2 Copy process 1-3-3 Machine cross sectional view Original 1 Exposure 2 Original image reading Original image data read by the CIS is A/D converted and image-processed, and the LPH Fluorescent lamp LEDs light to form a static latent image on the drum surface. 4 Main charging 3 Static latent image formation...
Page 38: Machine Drive System 1
340-1 1-3-4 Machine drive system (1) Drive system 1 (driven by the paper feed motor) 1 Paper feed motor pulley 15/18 ( Bypass registration clutch gear 2 Cutter drive belt ) Gear 50T 3 Drive tension pulley ⁄ Registration clutch gear 4 Cutter drive pulley 20 ¤...
Page 39 340-1 (2) Drive system 2 (driven by the paper feed motor) 1 Cutter drive gear 21 $ Idle gear 16/25 2 Cutter gear 32 % Duplex gear 32 3 Eject gear 29 ^ Roll idle gear A 4 Fixing unit idle gear 24T &...
Page 40 (3) Drive system 3 (driven by the drum motor and fixing drive motor) (4) Drive system 4 (driven by the drive motor and toner feed motor) & ‹ ¤ ⁄ & Figure 1-3-7 Drive system 3 (outer side to the left frame) Figure 1-3-8 Drive system 4 (inner side from the left frame) 1 Main drive pulley # Fixing section drive gear...
Page 41 (5) Drive system 5 (driven by the original feed motor) Figure 1-3-9 Drive system 5 (outer side to the right frame) 1 Original feed motor pulley 7 Front lower original roller 2 Original feed drive belt 1 8 Front upper original roller 3 Idle pulley 16 9 Original feed pulley 4 Tension pulley...
Page 42 1-3-5 Mechanical construction of each section (1) Paper feed section The paper feed section is comprised of the parts shown in Figure 1-3-10. Paper can be fed either manually or automatically from a paper roll. In the paper feed section, a sheet of paper fed from the roll unit or placed on the bypass table is conveyed to the transfer section in synch with the LED on timing of the LPH section.
Page 43 1 Registration upper guide ¤ Roll paper conveying upper guide 2 Bypass pulley ‹ Center partition 3 Registration lower guide › Roll lever 4 Bypass table ﬁ Roll base B 5 Bypass registration roller ﬂ Paper roll shaft 6 Registration roller ‡...
Page 44 Paper Feed Drive The paper feed motor drives the paper feed rollers through electromagnetic clutches. When the feed clutch is off and the roll winding clutch is on, the paper spool reverses to pull back the roll leading edge the home position. Paper Roll and Original Width Detection Two sensors, paper size switches 1 and 2, detect the roll width.
Page 45 Paper Transport The by-pass registration clutch and the by-pass registration switch are used to control the paper feed timing. For roll feeding, the feed clutch, roll paper conveying clutch, registration clutch, and registration switch control the paper feed timing. The paper feed length is measured by the registration sensor on time. Initially, the paper feed motor is slightly faster than the drive motor which drives the pre-transfer drive roller.
Page 46 Winding operation of paper roll The leading edge of the paper in the roll unit is first fed to the home position (copy ready position) by the winding operation, where it is ready for copying. • After the following operations, if the leading edge of the paper roll is not at the home position, the winding operation for that roll unit will be performed.
Page 47 • With the roll paper leading edge detection switch on RWCL-U RLDSW-U 100 ms FCL-U Timing chart 1-3-2 Winding operation for the first roll unit (2) a The paper feed motor (PFM) and the upper roll winding clutch (RWCL-U) are turned on, and the paper starts to wind.
Page 48 (1-1) Bypass paper feed Paper insertion Original insertion BYPRSW: On OLDSW: On BYPTIMSW: Off BYPTIMSW: On OTDSW: On 1.75 s 200 ms 574 ms 750 ms BYPRCL OLDSW BYPRSW OTDSW BYPTIMSW 450 ms PSYNC signal Potential buildup completed. Primary original feed completed. Shading correction completed.
Page 49 (1-2) Roll unit paper feed Original insertion OLDSW: On OLDSW: Off OTDSW: On CHPSW: On RSW: Off RSW: On CHPSW: Off 200 ms 78 P OLDSW 375 ms RPCCL PCSW OTDSW FCL-U/M/L CHPSW1, 2 OFCL 450 ms 600 ms 574 ms PSYNC signal Potential buildup completed.
Page 50 d Potential buildup, primary original feed and then shading correction are completed. 450 ms after these secondary paper feed start conditions are satisfied, the PSYNC signal is turned on. e The roll paper conveying clutch (RPCCL) and registration clutch (RCL) turn on to start secondary paper feed.
Page 51 (2) Main charger section The main charger section is comprised of the drum, the drum potential sensor (DPS), the main charger assembly and the main charger grid as shown in Figure 1-3-12. The drum is electrically charged uniformly by means of a grid to form a static latent image on the surface.
Page 52 Figure 1-3-13 Main charger section (Main charger assembly) 1 Right main charger lid 5 Left main charger lid 2 Screw 6 Main charger terminal 3 Washer 7 Charger spring 4 Charger wire (tungsten wire) 8 Main charger shield MC REM CN6-17 GRID CONT CN7-23...
Page 53 Block Diagram Description 3.534 seconds after the drum motor starts, MCREM signal turns on and the main high voltage transformer applies approximately 6 kV to the charge corona wire. Grid voltage depends on the pulse width at CN7-2. When a charge corona leak occurs, the MC ALARM signal is sent to the main PCB and SC302 is displayed.
Page 55 Potential buildup completed. OTDSW: On ESW: On ESW: Off 2.3 s OTDSW 3.534 s MHVT 1.6 s 400 ms 400 ms GRID CONT 3.534 s 600 ms 400 ms DB CONT 400 ms Timing chart 1-3-5 Operation of the main high-voltage transformer a When the original is inserted, the original trailing edge detection switch (OTDSW) is turned on.
Page 57: Drum Drive Gear
Drum Drive Mechanism The drum is driven by the drum motor through an idle gear. The gear of the drum flange transmits the drum rotation to the cleaning brush and the cleaning spiral. This machine uses an OPC drum of 90mm diameter.
Page 58 340-3 Drum surface potential correction The grid control voltage (GRID CONT) is determined based on the target value set by simulation 35 to maintain the drum surface potential around the developing section to 870 V DC. • Correction timings 1) When any of the safety switches are turned off and on. 2) When the power plug is removed and reinserted.
Page 59 (3) Exposure and original feed section Figure 1-3-15 Exposure and original feed section 1 Original insertion guide 9 Original feed rear light shielding plate 2 Front upper original roller 0 Fluorescent lamp (FL) 3 Middle upper original roller ! Fluorescent lamp heater (FLH) 4 Contact glass @ Front lower original roller 5 Original holder rear guide...
Page 61 Original Feed Mechanism Original is fed by original upper rollers and original lower rollers, which are driven by the original feed motor. The original feed clutch controls the rollers movement according to the sensors. In the syncro-cut function, the length of the original is detected by the original trailing edge detect sensor on time.
Page 62 FLTH CN2-1 CN2-10 CN2-2 CN2-14 CN2-11 CN2-3 CN3-12 CN2-12 CN4-7A CN2-13 CN3-13 DCM2PCB MPCB DCM2PCB TXD/RXD CN3-30 INPCB CN3-31 DCM2PCB RXD/TXD CN3-32 CN3-33 FL CONT CN7-22 FL REM CN6-18 FLH REM CN5-5 CN4-13B CN6-6 OFM SPEED1 CN3-23 OPPCB OFM ENA CN3-24 OFM SPEED2 CN3-25...
Page 63 OLDSW: On OTDSW: Off OTDSW: Off OTDSW: Off OTDSW: Off OTDSW: On OTDSW: On 1325 ms OLDSW OTDSW 640 ms Forward 48 ms 48 ms 500 ms 500 ms Stop 200 ms 200 ms 500 ms Reverse OFCL Secondary paper feed start Second sheet secondary feed start Shading correction start Roll unit paper feed, multiple copying (2 sheets).
Page 64 (4) CIS and LPH section In the CIS and LPH section, the CIS reads the original image exposed by the fluorescent lamp (FL) and the drum surface is irradiated by the LPH to form a static latent image on it. Figure 1-3-17 CIS and LPH section 1 SLA (SELFOC lens array) 3 Fluorescent lamp (FL)
Page 65 340-1 CN11 ISUPCB CN17 CN22 CN21 LPHROMPCB INPCB 5 V DC LPHPSPCB MPCB FL CONT CN7-22 FL REM CN6-18 Figure 1-3-18 Block diagram of the CIS and LPH section 1-3-23...
Page 66 340-1 Original image reading The CIS (contact image sensor) consists of four channels of 3712 phototransistors. The original image is read by 14592 phototransistors along a line of the width of A0 (934 mm), and its analog data is sent to the ISU PCB (ISUPCB). Original image SLA (SELFOC 1 line...
Page 67 OLDSW: On OTDSW: Off OTDSW: On 1325 ms OLDSW OTDSW 640 ms Forward Stop Reverse OFCL 450 ms 450 ms OSYNC signal PSYNC signal Original and paper secondary feed start Image reading start Shading correction start Timing chart 1-3-7 Image reading and formation a 1 s after the original is conveyed and the original trailing edge detection switch (OTDSW) is turned on, the CIS (contact image sensor) starts shading correction and the fluorescent lamp (FL) lights.
Page 68 CIS correction • Shading correction Shading correction is carried out to correct the fluctuation in the fluorescent lamp (FL) intensity and variations in the sensitivity between the sensor elements constituting the CIS. If shading correction does not end within 30 s from its start, an original jam (J-05) is indicated.
Page 69 • AGC processing (gray level correction) The tone of the image is reproduced by dividing the CIS image read-in value into 256 levels. If the absolute white level is assumed to be 5.0 V and the absolute black level 0 V, the range of the actual image read-in value is narrower than the range from 0 to 5.0 V, so the tone of the reproduced image is affected.
Page 70 340-1 (5) Developing section The developing section is comprised of the developing unit assembly and the toner hopper assembly. The developing unit assembly is comprised of the developing roller and doctor blade which form a magnetic brush, and the developer paddle and developer spiral roller which mix the developer.
Page 71 Development Unit Drive The development unit is driven by the drive motor through a timing belt. The development paddle moves the developer from left to right, and the development spiral moves the developer from right to left (as viewed from the operation side). This distributes the developer evenly in the development unit. The development thermistor and the toner sensor are located in the center of the development unit.
Page 73 340-1 Forming the magnetic brush The developer flows by the rotation of the developing roller and the magnetic brush is formed on pole N1. The height of the magnetic brush is set by the gap between the doctor blade and the developing roller. The developing bias voltage (650 V DC) which is output from the developing bias high-voltage transformer (DBHVT) is applied to the developing roller to improve the image contrast.
Page 74 Temperature compensation of the toner sensor output Temperature compensation of the toner sensor (TNS) output value is applied by the following formula. The output values from the toner sensor (TNS) and the developing unit thermistor (DTH) are input to the main PCB (MPCB). The main PCB samples the two input values at 8 ms intervals.
Page 75 Toner sensor output correction based on the copy count The toner sensor (TNS) output is corrected by the following formula based on the copy count (copy distance). X = KM + TS where X: control input value (V, toner sensor output value after copy count correction) M: copy distance after execution of simulation 60 (m) TS: actual toner sensor output (V) K: distance correction coefficient (0.00021 V/m)
Page 76 Toner density control Message requesting toner to be replenished Add toner indictor on Toner sensor output voltage (V) 3 min Toner empty high level 0.351 V Toner empty level 0.234 V Toner control level Figure 1-3-27 Toner density control A The value set while simulation 60 (developer setting) is performed is used as the toner control level (initial output value for the toner control sensor).
Page 77 Toner Density Control [cont...] If solid black copies are made continuously, toner supply from the toner hopper cannot keep up with toner consumption and toner near end will be falsely indicaed. In this case, if “Single” has been selected in SP 67, toner is supplied after every copy job, and the toner density will automatically recover to the normal level (This prevents false toner near end detection, but users need to wait after every copy job).
Page 79 (6) Transfer/separation section The transfer/separation section is comprised of the transfer charger assembly, the pre- transfer roller, and the separation claws as shown in Figure 1-3-28. Figure 1-3-28 Transfer/separation section 1 Separation claw solenoid (SSOL) 7 Transfer charger 2 Tungsten wires 8 Separation charger 3 Pre-transfer upper inner guide 9 Transfer charger assembly...
Page 80 Block Diagram Description The transfer & separation high voltage transformer applies the transfer and separation voltages. The transfer and separation triggers are applied from CN4-1B and CN4-2B. The transfer voltage is about dc –5.3 kV and the separation voltage is about ac 5.6 kV and dc 40 V. When transfer or separation charge leakage occurs, the ST ALARM signal is sent to the main PCB, and SC401 is displayed.
Page 82 The transfer charger assembly is divided into the transfer charger which transfers the toner image formed on the drum to the paper, and the separation charger which removes the paper from the drum. Transfer charging and separation charging are performed by applying high voltage which is output from the ST high-voltage transformer (STHVT) to both ends of each tungsten transfer charger and separation charger wires.
Page 83 Separation Claw (Pick-off Pawl) Mechanism During stand-by, the separation claws are not in contact with the drum surface. 450 ms after the drum potential step control is finished, the separation claw solenoid is energized and the claws move up to the drum.
Page 85 OTDSW: Off OTDSW: On PCSW: On PCSW: Off OTDSW PCSW 944 ms SSOL 1704 ms 1680 ms THVT 2.3 s 800 ms SHVT DB CONT 450 ms 450 ms PSYNC signal Potential buildup completed. Primary original feed completed. Shading correction completed. Timing chart 1-3-8 Operation of the transfer/separation section a 2.3 s after the original is inserted and the original trailing edge detection switch (OTDSW) is turned on, the drive motor (DM) turns on and, at the same time, separation charging...
Page 86 340-1 (7) Cleaning section Cleaning is performed by the blade cleaning method and the cleaning fur brush. The cleaning section is comprised of the cleaning blade and the cleaning fur brush which remove the residual toner adhering to the drum after transfer, and the cleaning unit spiral which collects and sends toner to the waste toner tank.
Page 87 Toner Collection Mechanism During stand-by, the cleaning blade is not in contact with the drum surface. During copying, the cleaning solenoid is energized and the cleaning blade is pressed against the drum surface. When the toner disposal tank becomes full, the toner overflow switch turns off and a message is displayed for the user to replace the tank.
Page 89 CSOL 1 CN6-5 CSOL 2 CN6-4 TDT DSW CN3-7 CSOL CN3-8 MPCB Figure 1-3-32 Block diagram of the cleaning section 1-3-37...
Page 90 OTDSW: On OTDSW: Off OTDSW 1.3 s CSOL 1 10 min CSOL 2 Timing chart 1-3-9 Operation of the cleaning solenoid The cleaning solenoid (CSOL) is controlled by signals CSOL 1 and CSOL 2. a 1.3 s after the original is inserted and the original trailing edge detection switch (OTDSW) is turned on, signals CSOL 1 and CSOL 2 are turned on and the cleaning solenoid (CSOL) is turned on.
Page 91 (8) Static eliminator section The static eliminator section is comprised of the two cleaning lamps as shown in Figure 1-3-33. The post-transfer lamp (RTL) is to eliminate unnecessary charge, and the pre- charging lamp (PCHL) is to eliminate the residual charge after transfer. Post-transfer lamp ..
Page 92 MPCB CN6-8 OPPCB PCHL RTL REM CN4-12B CN5-6 PCHL REM CN5-7 CN4-12A Drum CN6-7 Figure 1-3-34 Block diagram of the static eliminator section OTDSW: On OTDSW: Off OTDSW 2.3 s PCHL Timing chart 1-3-10 Operation of the static eliminator section a After the drive motor (DM) is turned on, the pre-charging lamp (PCHL) and the post- transfer lamp (RTL) are turned on.
Page 93 (9) Fixing section ‹ › ¤ ⁄ &* Figure 1-3-35 Fixing section # Fixing unit front guide 1 Fixing heater M (H1) $ Fixing unit lower partition 2 Fixing heater S (H2) % Front lower removal cover 3 Oil roller ^ Press roller 4 Heat roller &...
Page 95 Oil Supply Mechanism The oil roller, which contacts the heat roller applies oil to the heat roller surface. The heat roller gear drive is transmitted to the oil roller gear through an idle gear, and the oil roller rotates in the same direction as the heat roller.
Page 96 Fixing Unit Release Mechanism The fixing section can be released from the drum section to remove misfed paper in the fusing section. When the left and right levers are pulled, the hooks are released and the fixing unit can be pulled towards the operator’s side.
Page 97 Fixing Entrance Guide The fixing entrance guide controls the angle of the paper leading edge, so that the paper is fed properly between the heat roller and press roller without creasing or misfeeding. The height of the center of the guide can be changed by changing the number of spacers to suit various types of paper. Fusing Entrance Guide 1-3-41-3...
Page 98 340-3 The fixing section is comprised of the parts shown in Figure 1-3-35. After the transfer operation, the paper is conveyed to the fixing section and passes between the heat roller and the press roller. A constant pressure is applied between the heat roller and the press roller by the fixing press spring and the toner transferred is fixed on the paper by the heat and pressure applied from each roller.
Page 99 Heating and temperature control of heat roller and press roller • Heat roller temperature control 1 Fixing unit thermistor 1 (FTH1) detects the surface temperature around the center of the heat roller and fixing unit thermistor 2 (FTH2) detects the surface temperature of the right end of the heat roller.
Page 100 • Heat roller temperature control 2 When the temperature T detected by the external temperature thermistor (ETTH) is as ETTH in the table, the control temperatures are changed to prevent poor fixing. If the ambient temperature is below 15°C/59°F, fixing is not performed sufficiently, and if greater than 30°C/86°F, the image may be blurred.
Page 101 • Press roller temperature control 1 If the surface temperature of the press roller is less than its minimum value or the surface temperature between the heat roller side and on the opposite side is different, fixing problems may occur. Therefore, the following control is performed to keep the surface temperature of the press roller constant.
Page 102 Paper Exit Mechanism After the image is fixed, the copy paper is transported to the copy tray by the exit rollers. There are 13 separation claws (hot roller strippers) which help paper to separate from the heat roller. Separation Claw Upper Exit Roller Lower Exit Roller 1-3-46...
Page 103 ELECTRICAL SECTION...
Page 105: Electrical Parts Layout
CONTENTS 2-1 Electrical Parts Layout 2-1-1 Electrical parts layout ................2-1-1 1-1-11...
Page 107 340-3 2-1-1 Electrical parts layout Machine left Machine inside Machine right Right frame Left frame Machine rear Figure 2-1-1 Printed circuit boards 1. Main PCB (MPCB) ..........Output control for image processing and LED printhead (LPH) and control of other electrical components.
Page 108 340-3 3. LPHROM PCB (LPHROMPCB) ......Stores LPH light intensity correction data. 4. Operation unit PCB (OPCB) ......Consists of operation keys, display LEDs and LCD. 5. Servo motor control 1 PCB (DCM1PCB) ... Drive control of the drive motor, drum motor and fixing drive motor.
Page 109 340-3 21,22 30,31 34,44 35,36 13,43 37,38 16,23,24 17,25,26 18,27,28 Machine left Machine inside Machine right Figure 2-1-2 Switches and sensors (1) 1. Main switch (MSW) ..........Turns AC power supply to the power source PCB on and off. 2. Safety switch 1 (SSW1) ........Forms a safety circuit when the left front cover is open.
Page 110 340-3 21,22 30,31 34,44 35,36 13,43 37,38 16,23,24 17,25,26 18,27,28 Machine left Machine inside Machine right Figure 2-1-3 Switches and sensors (2) 7. Safety switch 6 (SSW6) ........Forms a safety circuit when the upper rear cover is open. 8. Original holding section switch (OHSW) .... Detects that the original holding section is open.
Page 111 11. Registration switch (RSW) ......... Control of paper feed motor, drive motor, fixing drive motor, feed clutch, roll paper conveying clutch and registration clutch and detection of paper jams. 12. Paper conveying switch (PCSW) ....... Control of separation claw solenoid and detection of paper jams.
Page 112 340-3 21,22 30,31 34,44 35,36 13,43 37,38 16,23,24 17,25,26 18,27,28 Machine left Machine inside Machine right Figure 2-1-4 Switches and sensors (3) 23. Upper paper size switch 1 (PSSW1-U) ....Detection of paper size in the 1st roller unit. 24. Upper paper size switch 2 (PSSW2-U) ....Detection of paper size in the 1st roller unit.
Page 113 340-3 *1 ....28. Lower paper size switch 2 (PSSW2-L) Detection of paper size in the 3rd roller unit. 29. Waste toner tank detection switch (TDTDSW) ............Detects presence of the waste toner tank. 30. Fixing unit thermal switch 1 (FTSW1) ....Forms the fixing heater M and S safety circuits.
Page 114 340-1 11,12 9,10 Machine left Machine inside Machine right Figure 2-1-5 Motors 2-1-8...
Page 115 1. Drive motor (DM) ..........Drives developing unit and transfer unit. 2. Original feed motor (OFM) ......... Drives original feed unit. 3. Paper feed motor (PFM) ........Drives paper feed unit. 4. Fixing drive motor (FDM) ........Drives fixing unit. 5.
Page 116 340-1 14,18 20,21 12,13 Machine left Machine inside Machine right Figure 2-1-6 Others 1. Original feed clutch (OFCL) ....... Original feed (control of original feed roller rotation). 2. Registration clutch (RCL) ........Secondary feed of paper fed from roll unit (control of registration roller rotation).
Page 117 5. Middle roll winding clutch (RWCL-M)....Winding of paper roll (control of 2nd roll unit paper roll shaft rotation). *1 ...... 6. Lower roll winding clutch (RWCL-L) Winding of paper roll (control of 3rd roll unit paper roll shaft rotation). 7.
Page 119: Detection Of Paper Misfeed
CONTENTS 2-2 Detection of Paper Misfeed 2-2-1 Paper misfeed detection ..............2-2-1 2-2-2 Paper misfeed detection conditions ............ 2-2-2 1-1-13...
Page 121: Paper Misfeed Detection
2-2-1 Paper misfeed detection When a paper jam occurs, the copier immediately stops copying and the display on the operation unit shows a code consisting of “J” followed by a number between 01 and 06, indicating the location of the jam. Paper jam counts sorted by the detecting conditions can be checked by simulation 74.
Page 122: Paper Misfeed Detection Conditions
340-1 2-2-2 Paper misfeed detection conditions OTDSW OLDSW OFCL PCSW BYPRSW BYPRCL FCL-U FCL-M FCL-L Figure 2-2-2 Misfeed detection 2-2-2...
Page 123: Timing Chart No. 1
1. Paper jam in the paper feed section (1st roll unit): J-01 When the new paper roll is wound up (first paper feed), the registration switch (RSW) does not turn on within 2720 ms after the upper feed clutch (FCL-U) has turned on. FCL-U 2720 ms Timing chart 2-2-1...
Page 124: Timing Chart No. 5
3. Paper jam in the paper feed section (3rd roll unit): J-03 When the new paper roll is wound up (first paper feed), the registration switch (RSW) does not turn on within 6380 ms after the lower feed clutch (FCL-L) has turned on. FCL-L 6380 ms Timing chart 2-2-5...
Page 125 5. Paper jam in the original feed section: J-05 The original trailing edge detection switch (OTDSW) does not turn on within 3 s after the original feed motor (OFM) has turned on to start original feed. The original leading edge detection switch (OLDSW) stays off 1 s after the original trailing edge detection switch (OTDSW) has turned on.
Page 126 340-1 6. Paper jam inside the copier main unit: J-06 The registration switch (RSW), paper conveying switch (PCSW) or eject switch (ESW) is on when the main switch (MSW) is turned on or during ready mode. The paper conveying switch (PCSW) does not turn on within 3392 ms after the registration clutch (RCL) has turned on.
Page 127 The eject switch (ESW) does not turn off within 8s after the registration clutch (RCL) has turned off. Timing chart 2-2-13 No pulse signal is detected from the fixing unit pulse sensor (FPS) for 1 s while the eject switch (ESW) is on. Pulse detection time Timing chart 2-2-14 2-2-7...
Page 129: Operation Of The Pcbs
CONTENTS 2-3 Operation of the PCBs 2-3-1 Power source PCB ................2-3-1 (1) Noise filter circuit ................. 2-3-2 (2) Rectification/surge limiter/smoothing circuit ........ 2-3-2 (3) Pulse width control circuit ............2-3-3 (4) 24 V DC output/error detection circuit ......... 2-3-4 (5) 5 V DC output/5 V DC over-current protection circuit ....
Page 131: Power Source Pcb
2-3-1 Power source PCB Transformer 24 V DC output AC input 24 V DC Noise Rectification/ output circuit filter surge limiter/ circuit smoothing circuit +12 V DC ±12 V DC output circuit –12 V DC Error Photocoupler detection circuit Pulse width control/ over-current protection circuit Over-voltage...
Page 132 (1) Noise filter circuit Figure 2-3-2 Noise filter circuit The noise filter circuit consists of coils L1, L2 and L3 and capacitors C1, C2, C3, C4 and C5. It prevents high-frequency noise from escaping to the outside through the AC input line. It also prevents noise from external devices from entering this copier through the AC input line.
Page 133 (3) Pulse width control circuit DCIN+ T1 2/3 DCIN– R20 R21 Z9 2/2 Figure 2-3-4 Pulse width control circuit In the pulse width control circuit, FETs Q3 and Q4 are switched on and off by the pulse signals from the pulse width control IC U2. The current flowing into the primary side coil of transformer T from the smoothing circuit is switched, and an e.m.f.
Page 134 (4) 24 V DC output/error detection circuit CN2-1 CN2-2 CN2-3 CN2-4 R46 C27 C28 +24 V CN3-1 CN3-2 +24 V +24 V CN3-3 +24 V CN3-4 CN3-5 CN3-6 CN3-7 R53 D15 CN3-8 CN3-9 C35 R54 C33 D16 +24 V CN4-1 CN4-2 +24 V CN4-3...
Page 135 (5) 5 V DC output/5 V DC over-current protection circuit 24 V DC CN5-1 +5.1 V CN5-2 +5.1 V CN5-3 +5.1 V CN5-4 +5.1 V CN5-5 CN5-6 CN5-7 CN5-8 +5.1 V CN6-1 CN6-2 +5.1 V +5.1 V CN6-3 CN6-4 +5.1 V CN6-5 CN6-6 CN6-7...
Page 136 (6) Over-voltage protection circuit C44 R64 D22 C45 CN7-1 +12 V CN7-2 CN7-3 –12 V +5 V +24 V R77 R78 R85 C50 Figure 2-3-7 Over-voltage protection circuit 24 V DC, 5 V DC and ±12 V DC from the respective output circuits are applied to comparator Z12.
Page 137: Lph Power Supply Pcb
2-3-2 LPH power supply PCB 24 V DC Transformer 5 V DC output Noise 5 V DC filter output circuit circuit Error Photocoupler detection circuit Pulse width control/ over-current protection circuit Over-voltage Photocoupler detection circuit Figure 2-3-8 LPH power supply PCB block diagram The LPH power supply PCB consists of noise filter, pulse width control, 5 V DC output, over- voltage and over-current protection circuits and generates stable 5 V DC.
Page 138 (2) Pulse width control circuit T1 1/3 DCIN+ T1 2/3 DCIN– T1 3/3 Z3 2/2 Z2 2/2 Figure 2-3-10 Pulse width control circuit In the pulse width control circuit, FET Q1 is switched on and off by the pulse signals from the pulse width control IC Z1.
Page 139 (3) 5 V DC output/error detection circuit CN-B +5 V Figure 2-3-11 5 V DC output/error detection circuit The 5 V DC output circuit rectifies the voltage generated on the transformer secondary coil using diode D9, smoothes it using choke coil L2 and capacitors C19 and C20 and outputs it as 5 V DC.
Page 140: Servo Motor Control 1 Pcb
2-3-3 Servo motor control 1 PCB Servo motor control 1 PCB consists of drive motor control circuit, fixing drive motor control circuit and drum motor control circuit, all independent from each other. (1) Drive motor control circuit The drive motor control circuit is composed of the components as shown in Figure 2-3-12 to control the rotation of the drive motor.
Page 141 (2) Fixing drive motor control circuit The fixing drive motor control circuit is composed of the components as shown in Figure 2-3-13 to control the rotation of the fixing drive motor. 24 V 24 V CN3- 3 CN5 - 1 FDM REM FDM CLK CN3 - 4...
Page 142 (3) Drum motor control circuit The drum motor control circuit is composed of the components as shown in Figure 2-3-14 to control the rotation of the drum motor. 24 V 24 V CN3- 5 CN4 - 1 DRM REM CN4 - 2 DRM CLK CN3 - 6 DRM FG...
Page 143: Servo Motor Control 2 Pcb
2-3-4 Servo motor control 2 PCB Servo motor control 2 PCB communicates serially with the main PCB. It receives commands from the main PCB at input terminal DCM2PCB RXD and emits data at output terminal DCM2PCB TXD. DCM2PCB RXD Servo motor Main PCB control 2 PCB DCM2PCB TXD...
Page 144 (1) Original feed motor control circuit The original feed motor control circuit consists of CPU IC8 and four FETs. The FETs turn on to operate the original feed motor in response to the on/off signal (PWM0/P34) and the direction signals (OFM F ON and OFM R ON). The original feed motor turns in the normal direction to move an original into the direction of exposure.
Page 145 (2) Paper feed motor control circuit The paper feed motor control circuit consists of CPU IC8 and an FET. When signal PWM1/ P35 goes low, the FET turns on to drive the motor. When high, the FET turns off and the motor stops.
Page 146: Main Pcb
2-3-5 Main PCB MPCB Analog signals Sensors Switches Clutches Operation unit Motors IC 83 IC 74 ASIC ASIC IC 84 IC 93 IC41 High-voltage IC 111 IC 102 Roll paper transformers feed Commu- Commu- switches nication nication Fluorescent IC110 IC22 lamp Battery RESET...
Page 147 (1) Fixing temperature error detection circuit SSW 3,4,5,6 CN4-17B DI32 5 V DC R454 DI31 R455 R453 R383 R382 IC1A CN4-17A 24 V to PRY 1,2 CN4-16B R458 IC332Z-1 R456 5 V DC R457 ASIC 5 V DC IC41 5 V DC IC20 IC20 R159...
Page 148 (2) Reset circuit IC111 IC40-2 IC118 5 V DC C136 _RES2 5 V DC ASIC _RES1 IC41 CP93 R361 5 V DC R362 IC119 IC119 C137 ASIC 10 13 8 11 IC102 IC119 IC119 IC119 IC40-1 IC132-5 IC119 IC39-5 Figure 2-3-22 Reset circuit The reset circuit is comprised of system reset IC118 and peripheral circuits.
Page 149 • System reset IC operation timing 4.25 V RES1 Figure 2-3-23 System reset IC operation timing 1 When the power is switched on and the 5-V-DC power source voltage rises to 4.25 V, the potential of capacitor C137 connected to the TC pin of IC118 rises. 2 As the charging of C137 continues and the potential of the TC pin rises to 2 V, the output level of the RES1 pin goes high.
Page 150 (3) Image processing unit The image processing unit consists of an LSI exclusive for image processing (ASIC IC121, 112, 150, 103, 61, 100, 89 and 99). The IPU circuit receives 8-bit image signal (256 tone levels) digitized in the ISU PCB, edits the data into 5-bit signals (32 levels) and sends them to the LED printhead.
Page 151 • Input processing unit Eight-bit image data from the ISU PCB is read into line FIFO memory (C114) line by line. Holding data of a total of 7 lines via SRAMs (IC106, 113, 122, 123, 137, 138 and 139), IC121 conducts correction of the current line using the data of three lines on each side of it to eliminate any shift of the image in the sub scanning direction.
Page 152 • γ correction 8-kbyte SRAM 1 (IC104) is used for γ correction where a γ table is selected for each pixel out of the 32 tables (8k/256). The γ table data is stored in 32-kbyte SRAM 2 (IC105) to be used for selection of the table to be read out of SRAM 1 (IC104).
Page 153 • Zoom processing unit Processing for enlargement or reduction in the main scanning direction in zoom mode or processing in the main scanning direction in independent zoom mode is conducted at the zoom processing unit (IC103) based on the magnification ratio data computed by the CPU. Then pixel data is added or deleted at certain intervals to determine the actual enlargement or reduction.
Page 154 • Filter processing unit When a mode is selected on the operation panel, the CPU sets a value corresponding to that mode on the register. This starts image differentiation or integration to make a copy as close to the original as possible by modifying the image continuity in accordance with the type of the original used.
Page 155: Backup Pcb
2-3-6 Backup PCB BUPCB 5 V DC MPCB Data bus Address bus Control signals Lithium battery SRAM backup power supply unit Figure 2-3-26 Backup PCB block diagram Backup PCB (BUPCB) consists of SRAM, lithium battery BT1 and backup battery power supply unit and is connected to the main PCB with connectors.
Page 157: Image Processing
Image Processing Overview The CIS (Contact Image Sensor) reads one line of the original at 400 dpi resolution. The signal from the CIS is sent to the ISU board. The analog signal from the CIS is changed into 8-bit digital data after applying AGC (Auto Gain Control) processing and shading correction.
Page 158: Isu Pcb
2-3-7 ISU PCB The ISU PCB consists of analog processing unit where original image data read by the contact image sensor (CIS) is held for sampling and A-D-converted, shading correction unit, line forming unit where shading-corrected data is turned into line memory and a CPU in charge of data control for the respective ISU blocks.
Page 159 340-1 (1) Analog processing unit Four analog signals from the contact image sensor for one-line image data are output to the buffers of the analog processing unit in synch with start signal SI from the ISU PCB. As each sensor output has a high impedance, it is converted into a low-impedance signal by the buffer (IC42, 36, 34, 32) at the first stage.
Page 160 (2) A-D conversion/AGC processing unit Image data from the contact image sensor is converted into 8-bit digital data by the A-D conversion circuit IC1. When reference voltages for A-D conversion are set to 5 V and 0 V, the weight of the digital data (ID0 – ID7) is 5-0/256, i.e. about 19.5 mV. However the data obtained using the white reference plate is smaller than 5 V for the absolute white.
Page 161: Operation Unit Pcb
2-3-8 Operation unit PCB The operation unit PCB consists of keyboard input circuit, LED lighting circuit and display section, all controlled by one-chip CPU IC1. This four-bit CPU controls the keyboard inputs, display LED on/off and display on the operation panel according to the programs installed on it.
Page 162: Inverter Pcb
340-1 2-3-9 Inverter PCB CN2-1 +24 V CN2-2 CN1-4 CN1-3 Lighting CN1-2 signal (FL REM) CN2-5 Intensity CN1-1 control signal CN2-6 (FL CONT) Figure 2-3-31 Inverter PCB block diagram The inverter PCB consists of the high-frequency pulse generating circuit from which a high- frequency pulse of 37 kHz is emitted to the fluorescent lamp and the preheat circuit for the fluorescent lamp filaments.
Page 163 SET UP AND ADJUSTMENT SECTION...
Page 165 Rev. 04/2000 CONTENTS 3-1 Installation 3-1-1 Unpacking and installing the copier ……………………………. 3-1-1 (1) Installation environment …………………………………... 3-1-1 (2) Installation procedure ……………………………………… 3-1-2 3-1-2 Copy mode initial settings …………………………………….. 3-1-27 3-1-3 Installing the key counter (optional) ………………………….. 3-1-28 3-1-4 Installing the roll unit (optional) ……………………………….. 3-1-31...
Page 167: Unpacking And Installing The Copier
340-1 3-1-1 Unpacking and installing the copier (1) Installation environment 1. Temperature and humidity: 10°C – 35°C/50°F – 95°F, 15% – 85% RH 2. Power source: 120 V AC, 13 A/220 – 240 V AC, 8 A 3. Power source frequency stability: 50 Hz ± 0.3%, 60 Hz ± 0.3% 4.
Page 168 340-3 (2) Installation procedure Start Unpack the copier. Adjust the fixing pressure. Remove main charger assembly, accessory case and retaining tape. Connect the power cord. Remove spacers from the roll units Force the copier to stabilize and remove developing unit cover. (simulation 41).
Page 169 340-1 Unpack the copier. 1. Top pad 2. Inner case 3. Outer case 4. Main charger assembly 5. Dust cover 6. Machine body 7. Bottom pads 8. Skid 9. Front right pad 10. Hinge joint 11. Accessory case (see page 3-1-4 and Figure 3-1-3).
Page 170 Figure 3-1-3 Accessory case 1. Paper roll shafts 5. Accessory case 2. Original loop guide 6. Main unit support plates (2) 3. Tray stoppers (2) 7. Main unit support covers (2) 4. Accessory spacer 3-1-4...
Page 171 340-3 1. Remove the 14 hinge joints. (Packing case retainers), 6 top, 8 bottom. 2. Remove the top case, outer case, inner case, top board, top pad, four props , front right pad, and dust cover (see Figure 3-1-2). 3. Remove the tape retaining the front covers and copy bin. 4.
Page 172 340-3 6. Open the front cover. 7. Remove the two screws on the stopper support plate attached to each front cover and remove a screw on the earth wire. 8. Lift a front cover, and pull out the pin on the front cover from the hinge on the main unit to detach the front cover.
Page 173 340-3 10. Pass a rope through the machine bolts attached to the front and rear of the right side of the main unit. 11. Lift the right side of the main unit with the rope to remove the bottom pad. 12.
Page 174 340-3 Remove the main charger assembly, accessory case and retaining tape. 1. Remove the main charger assembly secured to the original holding section with tape. 2. Take out the accessory case placed on the base assembly of the main unit. 3.
Page 175 340-1 Remove spacers from the roll units and the developing unit cover. 1. Pull out the 1st roll unit. 2. Release the roll paper upper guide in the direction of the arrow by holding the roll paper insertion knobs. 3. Remove the roll unit spacer retained by tape. 4.
Page 176 Remove the tape retaining the cleaning unit weight. 1. Open the original holding section. 2. Pull the main unit release lever to open the main unit. 3. Remove the tape retaining the cleaning unit weight. 4. Close the original holding section. Cleaning unit weight Figure 3-1-11 Attach the flywheel assembly.
Page 177 Attach the main charger assembly. 1. Remove the 9P connector on the cleaning unit assembly. 9P connector Figure 3-1-13 2. Open the right cover. 3. Push the toner collection pipe downward until it is held by the pin and locked in place.
Page 178 4. Remove the M3 × 8 screw holding the cleaning unit retention stopper. 5. Slide the cleaning unit retention stopper in the directions of the arrows 1 and 2 to unlock the stopper plate. 6. Pull the cleaning assembly toward you and remove the cleaning assembly from the main unit.
Page 179 7. Loosen the two M4 × 8 screws holding the stopper plate, slide the plate all the way to the left and retighten the screws. Cleaning unit retention stopper M4 × 8 Stopper plate Figure 3-1-16 8. Fit the main charger assembly to the cleaning assembly by engaging the hinge on the main charger assembly with the groove in the cleaning unit retention stay.
Page 180 9. Attach the cleaning assembly to the main unit by inserting the cleaning unit retention stay in the larger hole in the rear of the left side plate of the main unit. (The small hole in front side is for shipment). Be sure to use this hole.
Page 181 340-3 11. Refit the 9P connector of the cleaning assembly to its original position. 12. Disconnect the 3P connector on the cleaning solenoid. 3P connector Cleaning solenoid Figure 3-1-20 13. Release the toner collection pipe. Caution: Closing the right cover without releasing the toner collection pipe causes a message to be displayed requesting that the waste toner tank be checked;...
Page 182 340-1 Remove the protection tape from the developing unit assembly. 1. Loosen the two upper rear cover pins and open the upper rear cover. 2. Remove the two screws from the upper rear cover and a screw from the earth wire to remove the upper rear cover from the main unit.
Page 183 340-1 5. Loosen the screws of the developing unit retention plates attached on the left and right of the developing unit lower partition and rotate the developing unit retention plates toward the front. Screw Developing unit retention plate Figure 3-1-24 6.
Page 184 340-1 Attach the developing unit cover to the developing unit assembly. 1. Remove the clamp (1 screw) attached to the right side of the developing unit cover. Developing unit cover Screw Clamp Figure 3-1-26 2. Insert the pin on the left side of the developing unit cover in the hole in the developing unit left plate to attach the cover to the developing unit assembly.
Page 185 Adjust the horizontal level of the unit. 1. Place a level on the developing unit lower partition and check that the unit is horizontal in all the directions. If not adjust the adjustment nuts with the caster lever (Item No.: 67802210). 2.
Page 186 Adjust the fixing pressure. 1. Pull the main unit release lever to open the main unit. 2. Open the front covers. 3. Detach the front left and right removal covers (1 screw each). 4. Tighten the fixing unit pressure adjustment nuts until they are fast. 5.
Page 187 Force the copier to stabilize (simulation 41) . 1. Force safety switch 6 on. 2. Turn the main switch on. 3. Enter 10871087 with the numeric keys to enter the simulation mode. 4. Enter 041 with the numeric keys. 5. Press the enter key. The copier enters the forced stabilization mode. Safety switch 6 Figure 3-1-30 3-1-21...
Page 188 Add the starting developer (simulation 10). Caution: Before adding the starting developer, ensure that developing unit assembly is located all the way to the machine left and the gear of the developing unit assembly meshes well with the gear of the main unit. 1.
Page 189 Rev. 01/2001 Set the developer (simulation 60). Input 060 with the numeric keys. Press the enter key. • The unit starts operating. When 3 minutes have elapsed since the start of operation, the toner control voltage is automatically set and the value is shown on the display.
Page 190 Pour toner into the toner hopper assembly. 1. Fit the 3P connector of the toner feed motor. 2. Shake a toner bottle well from side to side and up and down to mix the contents. 3. Remove the seal from the cap of the toner bottle. Figure 3-1-32 4.
Page 191 340-1 5. Hold the bottle at the lower part of it with one hand; slide the bottle to the machine center and then back to the original position four or five times while tapping the bottom with the other hand. Figure 3-1-34 6.
Page 192 Attach the accessories. 1. Attach the loop guide to the main unit by engaging the grooves in the loop guide with the two pins on the upper rear cover. 2. Open the copy bin and attach the tray stoppers to the left and right front covers by hanging the tray stopper claws in the tray stopper holes matching the desired size.
Page 193 340-3 3-1-2 Copy mode initial settings The factory settings for this machine are as shown below. • Contents of settings Sim. No. Contents Setting at factory Settings Exposure steps 1: 13 STEPS Auto shutoff function Present 1: ON Optional roll unit Not installed 1: NO CON-...
Page 194: Installing The Key Counter (Optional)
340-3 3-1-3 Installing the key counter (optional) Note that the following part is required in installing a key counter: Key counter socket assembly (Part No. 41529210) Procedure 1. Open the right cover. 2. Detach the right front cover. 3. Remove the three screws and detach the main switch assembly. 4.
Page 195 5. Remove the two screws (the lower one is fastened with a nut from the rear side) and detach the key counter cover. 6. Using the two screws removed in step 5, attach the key counter socket to the main switch assembly.
Page 196 8. Reattach the main switch assembly to the main unit. 9. Refit the right front cover on the main unit. 10. Close the right cover. 11. Plug the power cord to a wall outlet then turn the main switch on. 12.
Page 197 3-1-4 Installing the Roll Unit (optional) Procedure Be sure to turn the copier main switch off and unplug the power cord from the outlet before attaching the optional wall unit. Caution: Before starting the following procedure, ensure that the unit support assembly is present on the copier main body since the assembly cannot be attached to the copier after the roll unit is installed.
Page 198 Open the right side upper cover and remove the toner disposal tank. Remove the four screws and the right side lower cover [7A]. 10. Close the right side upper cover. 11. Remove the four screws and the rear lower cover [7B]. 12.
Page 199 14. Remove one screw and remove the lower lid [10]. 15. Fit the roll conveying support plate [P] to the copier rear frame with the three chromate binding screws [K] (M4x6) using the screw holes [11] in the frame. 16. Fit the bearing [Q] to roll conveying roller [D] with the stop ring [L].
Page 200 19. Fit the bearing [Q] to the shaft of the roll conveying rear roller [D] with the stop ring (E-7)[D] from outside of the roll conveying support plate [P]. 20. Fit the roll drive assembly [C] to the position where the roll drive lid [9] was until its removal in step 13, using the three screws which were holding the lid.
Page 201 23. Loop the drive belt [G] over the pulley [18] and the pulley [19] on the roll drive assembly. 24. Press the drive tension assembly [16] in the direction of the arrow in the diagram until its edge [20] covers half the hole [21] in the roll drive assembly, and retighten the assembly’s screw [17] loosened in step 22.
Page 202 29. Fit smaller pieces [27] of the roll sliders to the inside of the right and left frames using three binding screws (M4x6)[K]. NOTE: Orient the smaller pieces [27] with the portions [29] toward the front of the machine. 30. Slide one large piece [28] of the slider onto the smaller piece [27] installed inside the left frame.
Page 203 33. Place the roll unit [A] on the roll slider [F]. NOTE: 1. When carrying the roll unit, be sure to hold the bottoms of the left and right frames. 2. After installing the roll unit, remove the pads from it. 34.
Page 204 38. Loosen the three screws and remove connector [33], then slide the power source PCB assembly [34] in the direction of the arrow. 39. Install the empty switch [I] and two size detection switches [T] with two bronze binding screws [J] and [U] (M3x12) respectively.
Page 205 Operation Check Insert the copier power plug into the wall outlet and turn the main switch on. Access SP mode and change the setting of SP89 from 1 to 2 to select the Roll Unit. Load paper in the roll unit using the roll shaft and make test copies to check the operation.
Page 206 Roll Slider G. Drive Belt H. Bearing Empty Switch Bronze Binding Screw M3x12 2 Bronze Binding Screw M4x6 Stop Ring (E-7) M. Cable Tie N. Roll Shaft 3-1-40...
Page 207 O. Roll Heater Label (120V only) 1 Roll Conveying Support Plate 1 Q. Bearing R. Roll Conveying Rear Guide Cable Tie Size Detection Switch U. Bronze Binding Screw M3x12 4 Wire 3-1-41...
Page 208 Rev. 01/2001 ⇒ 3-1-5 Drum Conditioning Start Enter simulation mode. Input "103" with the numeric keys. The image is visible from around the 6 tone for Test Pattern 1, from around the 3 tone for Test Pattern 2 and from around the 9 tone for Test Pattern 3.
Page 209 340-3 CONTENTS 3-2 Simulation 3-2-1 Simulation function ................3-2-1 (1) Running a simulation ..............3-2-1 (2) Simulation list ................3-2-2 (3) Contents of simulations ............... 3-2-8 1-1-19...
Page 211: Simulation Function
340-3 3-2-1 Simulation function This copier is equipped with a simulation function which can be used to check the operation and allow adjustment of the electrical components. (1) Running a simulation Start Turn the main switch on. Enter 10871087 with the numeric - - - - - - Entering the simulation mode.
Page 212 340-3 (2) Simulation list Sim. Section Simulation contents Default Exiting simulation mode ——— Copying with original but no paper ——— Paper Checking paper feed clutch operation ——— feed/ Names of clutches and order of activation: conveying 1. Upper feed clutch 2.
Page 213 340-3 Sim. Section Simulation contents Default Paper Checking switch operation ——— feed/ Display Switch conveying Bypass registration switch (cont.) Bypass timing switch Upper roll paper leading edge detection switch Middle roll paper leading edge detection switch Lower roll paper leading edge detection switch (optional) Registration switch Paper conveying switch...
Page 214 340-3 Sim. Section Simulation contents Default Paper Adjusting 100% magnification ——— feed/ Adjusting leading edge registration ——— conveying Adjusting synchrocut length (297 mm) ——— (cont.) Adjusting synchrocut length (1189 mm) ——— Adjusting the leading edge margin ——— Adjusting the trailing edge margin/displayed ———...
Page 215 340-3 Sim. Section Simulation contents Default Charge Turning the cleaning lamps on ——— erasing Fixing Forced stabilization ——— Displaying the fixing unit thermistor detection ——— temperatures Setting fixing stabilization at low speed ——— Checking fixing heater operation ——— Operation Turning all the operation unit LEDs on ———...
Page 216 340-3 Sim. Section Simulation contents Default Copy Switching the counter counting units ——— modes Selecting the language ——— ——— Selecting between metric/inch Selecting the No. of exposure steps 1: 13 STEPS Initializing backup memory 2 ——— Switching the fixing temperature OTHERS Disabling cancellation of the auto shutoff function 1: ON...
Page 217 340-3 Sim. Section Simulation contents Default Image Adjusting exposure amount ——— quality Adjusting half-tone image quality ——— Adjusting AE optimum level ——— Switching filter modes ——— Adjusting filter gain ——— Setting AE fine adjustment intervals Gray output ——— 32-gradation output ———...
Page 218 340-3 (3) Contents of simulations Sim. Description Exiting simulation mode Description Exits simulation mode and returns to normal mode. Purpose Used when closing simulation mode. Method Press the enter key. The copier returns to the normal mode. Copying with original but no paper Description Makes copies without feeding paper.
Page 219 340-3 Sim. Description Checking paper feed clutch operation Description Operates the upper, middle and lower feed clutches individually. Purpose To check the operation of the paper feed clutches when the primary paper feed fails. Method Press the enter key. The feed clutches are activated one by one in the following order and each remains on for 4 seconds.
Page 220 340-3 Sim. Description Checking roll paper conveying/registration clutch operation Description Operates the roll paper conveying and registration clutches individually. Purpose To check the operation of the roll paper conveying clutch and registration clutch when the secondary paper feed fails. Method Press the enter key.
Page 221 340-3 Sim. Description Checking switch operation Description Checks the actions of the switches on the paper path by feeding paper. Purpose To check switches when paper jams. Method 1. Press the enter key. 2. Select the paper source by pressing the paper source key. 3.
Page 222 340-3 Sim. Description Checking paper feed motor operation Description Operates the paper feed motor. Purpose To check the drive in the paper feed section. Method Press the enter key. The paper feed motor starts to rotate. Completion Press the stop/clear key to stop the motor. Checking counter operation Description Increments the counts on the total counter and the key counter without...
Page 223 340-3 Sim. Description Checking fan motor operation Description Operates the fan motors individually. Purpose To check operation of the fan motors. Method Press the enter key. A step number is shown on the display. Selection Press the leading edge margin key to change the step number. STEP1: LPH fan motors 1, 2 on STEP2: LPH fan motors 1, 2 half-speed STEP3: Cooling fan motor full-speed...
Page 224 340-3 Sim. Description Checking original detection switch operation Description Displays the actions of the original leading/trailing edge detection switches. Purpose To check the original leading/trailing edge detection switches when the original feed fails. Method 1. Open the original holding section. 2.
Page 225 340-3 Sim. Description Setting delay before original feed start Description Sets the time to turn the original feed clutch on after the original leading edge detection switch is turned on. Purpose To facilitate copying for unaccustomed users by extending the time to start primary original feed after the insertion of original.
Page 226 340-3 Sim. Description Ignoring developing control Description Sets whether developing control is ignored or not. Purpose To operate the machine with the developing section removed. Method Press the enter key. Setting Choose a setting with the mode set keys. Display Setting description 1: CANCEL OFF Developing control used...
Page 227 340-3 Sim. Description Entering drum surface potential data for black & white mode Description Sets the drum surface potential in black & white (character) mode. Purpose To enter the value written on the simulation label after replacing the backup PCB or simulation 70 has been run. Method Press the enter key.
Page 228 340-3 Sim. Description Entering drum surface potential data for half-tone mode Description Sets the drum surface potential in half-tone mode. Purpose To enter the value written on the simulation label after replacing the backup PCB or simulation 70 has been run. Method Press the enter key.
Page 229 340-3 Sim. Description Displaying the thermistor outputs Description Displays the detected temperatures of the thermistors. Purpose To check the temperatures inside and outside the machine and near the fluorescent lamp. Method Press the enter key. The detected temperatures (°C) of the following thermistors are shown on the display.
Page 230 340-3 Sim. Description Coating the cleaning blade with toner Description Applies toner to the cleaning blade by coating the drum with toner. This simulation can be run after machine stabilization. To run this simulation before machine stabilization, run simulation 41 first. Purpose Used when replacing the cleaning blade or drum or installing the copier.
Page 231 340-3 Sim. Description Displaying the fixing unit thermistor detection temperatures Description Displays detected temperatures of fixing unit thermistors 1 to 4 and the external temperature thermistor. Purpose To check the fixing temperature when a fixing problem occurs. Method 1. Press the enter key. The current temperatures detected by fixing unit thermistors 1 to 4 and the external temperature thermistor are shown on the display in °C.
Page 232 340-3 Sim. Description Turning the cleaning lamps on Description Turns the pre-charging and post-transfer lamps on. Purpose To check the operation of the lamps when an offset occurs. Method Press the enter key. The pre-charging and post-transfer lamps turn on. Completion Press the stop/clear key.
Page 233 340-3 Sim. Description Checking fixing heater operation Description Turns fixing heaters M and S on. Purpose To check the operation of fixing heaters M and S. Method Press the enter key. Fixing heaters M and S turn off. Selection Select a heater to be turned on with the leading edge margin key or left margin key and then press the enter key.
Page 235 Sim. Description Turning the drum heater on Description Turns on the drum heater. Purpose To check drum heater operation Method Press the enter Key, Fixing heater turns off and drum heater turns on for 20 seconds. Completion This mode automatically stops after 20 seconds. 3-2-23-1...
Page 236 340-3 Sim. Description Turning all the operation unit LEDs on Description Turns LEDs on the operation panel on. Purpose To check the indicators and ready-lamp on the operation panel. Method Press the enter key. All the indicators and the ready lamp on the operation panel turn on.
Page 237 340-3 Sim. Description Loading developer Description Determines the toner control voltage automatically. Purpose Used at machine setup and after replacing the developing assembly or developer. Method Press the enter key. The drive motor turns on to conduct aging for three minutes.
Page 238 340-3 Sim. Description Turning developing bias on Description Outputs the developing bias. Purpose To check if the developing bias is output correctly when image contrast is poor. Method Press the enter key. Selection Select the bias mode with the mode set keys. The developing bias turns on at the value corresponding to the selected bias mode.
Page 239 340-3 Sim. Description Checking/changing toner control voltage Description Checks/sets the toner control voltage value determined automatically in simulation 60. Purpose Used after replacing the backup PCB. Method Press the enter key. Selection Change the setting by pressing leading edge margin key or left margin key. Indication 1 S: Toner control voltage value (the same value as simulation 60) ON: Level where the toner feed motor is turned on...
Page 240 340-3 Sim. Description Checking toner feed motor operation Description Carries out toner replenishment. Purpose To check the toner feed motor operation when a toner replenishment problem occurs. Method Press the enter key. The toner feed motor turns on for 5 s and toner is fed. •...
Page 241 340-3 Sim. Description Entering toner sensor control level/copy count Description Checks/sets the toner control voltage and copy count which are determined automatically in simulation 60. Purpose To set the toner sensor control level and copy count to the values set automatically in simulation 60 after the backup PCB has been replaced and simulation 70 has been run.
Page 242 340-3 Sim. Description Initializing backup memory 1 Caution: Clears all RAM Memory Description Initializes the contents of the backup memory. Purpose Used after replacing the backup PCB. Method 1. Press the enter key. The display changes from “INITIALIZING ON” to “INITIALIZING OK”.
Page 243 340-3 Sim. Description Sim No. Contents Default (cont.) Adjusting the trailing edge margin/displayed synchrocut length Trailing edge margin Displayed synchrocut length Adjusting the paper cut position for specified length cut mode Short, 1st roll unit (plain paper) Short, 1st roll unit (tracing paper) Short, 1st roll unit (film) Short, 3rd roll unit (plain paper) Short, 3rd roll unit (tracing paper)
Page 244 340-3 Sim. Description Sim No. Contents Default (cont.) Selecting the action after paper empty detection Plain paper 10 s Tracing paper 10 s Film Switching between front and rear ejection of originals ORG PSTN (S) 1: EJECT ORG PSTN (C) 2: RETURN Selecting the copy count timing MODE 1...
Page 245 340-3 Sim. Description Sim No. Contents Default (cont.) Adjusting filter gain CHARACTER HALF LIGHT BD HALF LIGHT BL Setting AE fine adjustment intervals Selecting current correction value MODE: 00 Adjusting base 4 output density DENSITY 2 DENSITY 3 Adjusting thresholds (central exposure level) THLD BW THLD HLF 1 THLD HLF 2...
Page 246 340-3 Sim. Description Intentionally Left Blank Intentionally Left Blank 3-2-34...
Page 247 340-3 Sim. Description Displaying/clearing total paper feed count Description Checks/resets the total paper feed count. Purpose To check the replacement time of the maintenance parts. Method Press the enter key. The number of copies made since the last count setting to the present is shown on the display. Display example TOTAL 1580...
Page 248 340-3 Sim. Description Intentionally Left Blank 3-2-36...
Page 249 340-3 Sim. Description Entering the service telephone No. Description Sets the telephone number to be shown on the service call code display. Purpose Used after replacing the backup PCB. Method Press the enter key. Setting 1. Enter the telephone number with the following keys. Characters and Keys to be pressed symbols...
Page 250 340-3 Sim. Description Intentionally Left Blank 3-2-38...
Page 251 340-3 Sim. Description Intentionally Left Blank 3-2-39...
Page 252 340-3 Sim. Description Displaying set data Description Displays data settings of the simulation items. Purpose To check data settings. Method Press the enter key. Selection 1. Select the simulation No. to be checked with the leading edge margin key and left margin key. 2.
Page 253 340-3 Sim. Description Specifying addresses/displaying data Description Displaying internal data. Purpose No need to run this simulation during maintenance. Method Press the enter key. The address No. for internal data is shown as six binary digits and the contents are displayed in hexadecimal. Display example 000000 00C0...
Page 254 340-3 Sim. Description Selecting the language Description Changes the language of the messages. Purpose To be set according to user request. Method Press the enter key. The current language is shown on the display. Selection Select one of the following languages with the mode set keys: Japanese English (UK) German...
Page 255 340-3 Sim. Description Selecting between metric/inch Description Sets the specification of the copier to metric or inch. Purpose Used after replacing the backup PCB. Method Press the enter key. The current setting is shown on the display. Setting Change the setting with the mode set keys. Setting description 1: CENCH 2: INCH...
Page 256 340-3 Sim. Description Initializing backup memory 2 Description Initializes the backup memory according to the destination. Purpose Used after replacing the backup PCB. Method Press the enter key. Selection Select the destination with the mode set keys. Display Destination 1. JPN Specification for Japan 2.
Page 257 340-3 Sim. Description Switching the fixing temperature Description Sets the secondary fixing temperature according to the destination. Purpose Used after replacing the backup PCB. Method Press the enter key. The current setting is shown on the display. Setting Change the setting with the mode set keys. Setting description 1: JPN (100 V areas) 2: OTHERS (120 V, 200 V areas)
Page 258 340-3 Sim. Description Setting optional roll unit Description Sets the installation of the 3rd roll unit. Purpose To be set after the optional 3rd roll unit is installed. Method Press the enter key. The current setting is shown on the display. Setting Change the setting with the mode set keys.
Page 259 340-3 Sim. Description Setting the maximum copy length for multiple copy mode Description Sets the maximum copy length for multiple copy mode. Purpose To be set according to user request. Method Press the enter key. The maximum copy length for multiple copy mode is shown on the display.
Page 260 340-3 Sim. Description Selecting the action after paper empty detection Description Sets the time before the paper empty detection function is activated. Purpose To be set depending on the type of roll paper in each paper source. Method Press the enter key. Selection Select the type of paper to be set with the leading edge margin key or left margin key.
Page 261 340-3 Sim. Description Switching between front and rear ejection of originals Description Switches the ejection direction of originals after copying. Purpose To be set according to user request. Method Press the enter key. Selection Select the copy mode to be set with the leading edge margin key and left margin key.
Page 262 340-3 Sim. Description Displaying the ROM versions Description Displays the versions of the currently installed ROMs. Purpose To check the ROM versions. Method Press the enter key. The ROM versions are shown on the display. Selection Change the display of the ROM versions with the mode set keys. Display Type of ROM Main control ROM 1...
Page 263 340-3 Sim. Description 32-gradation output Description Outputs a 32-gradation test pattern with the LPH current corrected. Purpose To check for an LPH problem, dirty main charger wire, grid or housing or drum problem. See page 3-3-18. Method Press the enter key. A test pattern copy in 32 gradation levels is ejected. Figure 3-2-2 Interruption Press the job stop/roll cut key.
Page 264 340-3 Sim. Description 32-gradation output (without compensation) Description Outputs a 32-gradation test pattern without correcting the LPH current. Purpose To check if the LPH current correction ROM is correctly installed to the main PCB. Method Press the enter key. A test pattern copy in 32 gradation levels is ejected as in simulation 103.
Page 265 340-3 Sim. Description Setting the controller type Description Sets the type of CAD controller to be used. Purpose To be set after installation of the interface controller. Method Press the enter key. Selection Select the type of CAD controller with the mode set keys. Display Setting description 1.
Page 266 340-3 Sim. Description Checking fluorescent lamp operation Description Lights the fluorescent lamp. Purpose To check the fluorescent lamp operation. Method Press the enter key. The fluorescent lamp lights and the display shows the following data. Display example Data No. Contents Standard fluorescent lamp light amount Current fluorescent lamp light amount Completion...
Page 267 340-3 Sim. Description Checking shading compensation operation Description Performs shading compensation and shows CIS channel data. Purpose To check respective channel data when solid black areas are too thin or white stripes appear on the copy image. Method Press the enter key. After shading compensation is completed, channel data is shown on the display.
Page 268 340-3 Sim. Description Checking AGC processing operation Description Performs AGC processing and shows data of the CIS channels. Purpose To check for an AGC error during A-D conversion. Method Press the enter key. After AGC processing is completed, the display shows the mean values for individual channels.
Page 269 340-3 Sim. Description Selecting the connection to the interface controller Description Selects the connection to the interface controller. Purpose To be run after an interface controller is installed. Method Press the enter key. The current setting is shown on the display. Selection Change the setting with the mode set keys.
Page 270 340-3 Sim. Description Adjusting γ correction Description Performs γ correction. Purpose Used after replacing the backup PCB, ISU PCB or CIS, or after running simulation 70 or 121. Be sure to clean the contact glass and the middle upper original rollers before running this simulation. Method Press the enter key.
Page 271 340-3 Sim. Description Adjusting optical axis Adjustment See page 3-3-30-9. Adjusting the image width in the main scanning direction Adjustment See page 3-3-30-10. Adjusting exposure amount Description Sets the exposure amounts for the respective original modes. Purpose Used after cleaning or replacing the fluorescent lamp or contact glass. Adjustment See page 3-3-24.
Page 272 340-3 Sim. Description Adjusting half-tone image quality Adjustment See page 3-3-26. Adjusting AE optimum level Adjustment See page 3-3-25. Switching filter modes Description Switches the contrast for copying letters. Purpose To be set according to user request. Adjustment See page 3-3-27. Method Press the enter key.
Page 273 340-3 Sim. Description Adjusting filter gain Adjustment See page 3-3-27. Setting AE fine adjustment intervals Adjustment See page 3-3-25-2. Selecting current correction value Description Performs current correction so that the currents of individual LEDs constituting the LPH are uniform and the gray output during simulation 102 is even.
Page 274 340-3 Sim. Description Solid black test pattern output Description Outputs a solid black test pattern. Purpose To check for a problem on the main PCB when an image problem occurs. Method Press the enter key. A 594-mm-long test pattern for solid black adjustment is produced.
Page 275 340-3 Sim. Description Adjusting Exp. 7.0 threshold See the memory unit service manual. Setting the memory unit connection See the memory unit service manual. Selecting display of the “Output?” screen after restart See the memory unit service manual. Setting the AE scan See the memory unit service manual.
Page 276 Sim. Description PM Cycle copy counter Description Displays copy count between preventive maintenance cycles. Displaying/Clearing Jam/SC counters Description Displays and clears counters for paper jams, original jams and SC’s Purpose To check or reset the counters for paper/original jams and SC’s. Method Press the enter key.
Page 277: Assembly And Disassembly
340-3 CONTENTS 3-3 Assembly and Disassembly 3-3-1 Cautions during disassembly and assembly ........3-3-1 (1) Caution ..................3-3-1 (2) Method of executing simulation ........... 3-3-2 3-3-2 Paper feed section ................3-3-3 (1) Adjustment of 1189 mm synchro cut (adjustment of paper feed motor speed) .............
Page 278 340-3 3-3-5 Developing section ................3-3-31 (1) Changing developer ..............3-3-31 (2) Adjustment of doctor blade: reference ........3-3-33 (3) Adjustment of position for magnetic brush: reference ....3-3-35 (4) Replacement of the lower developing seal ........ 3-3-36 3-3-6 Transfer/separation section .............. 3-3-37 (1) Replacement of charger wire ............
Page 279: Cautions During Disassembly And Assembly
3-3-1 Cautions during disassembly and assembly (1) Caution • When carrying out disassembly, be sure to turn the main switch off and pull out the power cord before starting. • When handling PCBs avoid touching PCB connectors with the bare hands or scratching equipment.
Page 280 (2) Method of executing simulation Start Input “10871087” with the numeric Enters simulation mode... keys......“000”...
Page 281: Paper Feed Section
340-3 3-3-2 Paper feed section Note: Follow the running order of simulations for image adjustment where indicated, otherwise the contents of the simulations may be affected and the correct copy image may not be obtained. (1) Adjustment of 1189 mm synchro cut (adjustment of paper feed motor speed) Perform when the paper is not cut to the proper length when paper is A0 (1189 mm) or larger or when the cutting length differs according to the paper used (normal paper, film, tracing paper).
Page 282 Is length A Increase the value with the from the line to the trailing mode set keys. edge shorter than 16 mm? Is length A Decrease the value with from the line to the trailing the mode set keys. edge longer than 17 mm? Press the stop/clear key.
Page 283 340-3 (2) Leading edge margin adjustment Perform when the leading edge margin of the copy image is not within the specified range. Sim. 53 Sim. 57 (p. 3-3-22) Caution: • Before starting this adjustment, ensure that the adjustment in the above simulation is completed.
Page 284 340-3 (3) Adjustment of 297 mm synchro cut Perform when the paper is not cut to the proper length when carrying out synchro cut copy with a paper less than A0 (1189 mm) size. Sim. 53 Sim. 55 (p. 3-3-22) Caution: •...
Page 285 340-3 (4) Adjustment of paper cutting position when the paper length is specified Perform when the paper is not cut to the proper length when executing fixed length copies or when the cutting length differs according to the paper used (normal paper, film, tracing paper).
Page 286 Is the paper Increase the value with the cut shorter than specified mode set keys. length A? Is the paper Decrease the value with the cut longer than specified mode set keys. length A? Setting range: –128 to +128 Adjust for the other size? Reference: 0 Change for 1 step: 0.922 mm The larger the value, the longer...
Page 287 Cutter Unit Removal 1. Remove the lower rear cover and the lower left cover. Secure the cutter home position sensor disk using 1 screw. 2. Remove the developer collection box, and remove the stepped screw. 3. Remove the 4 screws securing the paper guide. Then turn the paper guide to remove it (1 connector).
Page 289 340-3 (5) Adjustment of displayed synchro cut length Perform when the synchro cut length shown on the display is different from the actual cut length. Procedure Start. Enter simulation mode. Input “058” with the numeric keys. Press the enter key. Select “SYNCHRO ADJ”...
Page 290 340-2 (6) Attachment and removal of the roll paper feed lower roller A Follow the procedure below when cleaning or replacing the roll paper feed lower roller A. Procedure 1. Remove the front covers. 2. Remove the 1st roll unit from the main unit (two screws on each side). Roll unit Roll unit Figure 3-3-4(a)
Page 291 340-2 4. Remove the six screws and spring then the slider right attachment plate. Figure 3-3-4(c) 5. Remove the E-ring, drive gear 20T and pin. 6. Remove the E-ring and bearing. Figure 3-3-4(d) 3-3-9-2 3-3-11...
Page 292 340-2 7. Remove the E-ring on the right side of the roll paper feed lower roller A and remove the bearing. 8. Remove the E-ring and bearing from the hinge section by moving it in the direction of the arrow. Remove the roll paper feed lower roller A from the roll unit. 9.
Page 293 340-2 5. Remove the main PCB (lower right side of equipment). 6. Remove the E-ring and the bearing retaining the roll paper conveying rear roller B from the outside of the right side plate. Figure 3-3-4(g) 7. Remove the roll paper conveying rear roller B from the main unit. •...
Page 294 340-2 (8) Attachment and removal of the roll paper conveying rear roller B (for optional 3rd roll unit) Follow the procedure below when cleaning or replacing roll paper conveying rear roller B (for optional 3rd roll unit). Procedure 1. Remove the front covers, lower left cover and lower right side cover. 2.
Page 295 340-2 7. Remove the roll paper conveying rear roller B from the main unit. • When attaching, make sure that the longer of the two thin ends of the shaft is positioned on the left as shown in the figure. 8.
Page 296 340-2 5. Open the upper right side cover and remove the waste toner tank. 6. Remove the E-ring and the bearing retaining the bypass feed roller from the outside of the right side plate. Figure 3-3-4(m) 7. Remove the bypass feed roller from the main unit. •...
Page 297 340-2 (10) Attachment and removal of the roll paper conveying rear roller A Follow the procedure below when cleaning or replacing roll paper conveying rear roller A. Procedure 1. Remove the lower rear cover and lower left cover. 2. Remove the roller paper conveying clutch. 3.
Page 298 340-2 6. Remove the roll paper conveying rear roller A from the main unit. • When attaching, make sure that the longer of the two thin ends of the shaft is positioned on the left as shown in the figure. 7.
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Page 300: Main Charger Section
3-3-3 Main charger section (1) Replacing the drum Replace the drum as follows. Caution: After replacing the drum be sure to clean the main charger assembly and check the drum surface potential (see page 3-3-18) after coating the cleaning blade with toner (simulation No.
Page 301 340-1 3. Remove the screw on the drum left rail guide. 4. While holding the drum release plate toward the drum, slide the drum left rail guide toward the machine rear. The drum release plate is locked and the drum flange is unlocked from the drive joint.
Page 302 340-1 6. Remove the screw and raise the drum right rail guide. 7. Attach the screw removed in step 6 to part A so that the main unit is kept open. 8 . Roll the drum toward you along the drum right rail guide. 9 .
Page 303 340-1 (1-1) Cleaning the drum electrodes Procedure • Cleaning the electrode on the drum right flange 1. Detach the cleaning assembly. 2. Remove the screw on the drum left rail guide (see page 3-3-11). 3. While pressing the drum release plate toward the drum, slide the drum left rail guide toward the machine rear.
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Page 305 (2) Cleaning the drum Follow the procedure below when image errors occur. Caution: • Avoid direct sunlight and strong light when cleaning the drum. • Dust in the air and from the cleaning pad may damage the drum during operation. Avoid working in dusty place.
Page 306 340-1 (3) Changing the charger wire Follow the procedure below when the charger wire is broken or when replacing the charger wire. Caution: • Use the specified tungsten wire for the charger wire. (Item No. 74716280, Anodized tungsten wire, 0.08 mm) •...
Page 307 340-1 3. Remove the right and left main charger lids. 4. Remove the charger spring from the main charger terminal and loosen the screw to remove the charger wire. Main charger right lid Screw Washer Main charger left lid Tungsten wire Charger spring Main charger terminal Figure 3-3-11...
Page 308 340-1 6. Hook the charger spring to the main charger terminal and pass the tungsten wire through the opening in the wire adjustment plate. 7. Pass the tungsten wire under the washer and fasten it with the screw keeping the charger wire stretched so that the charger spring is at least 16 mm long.
Page 309 340-3 (4) Adjustment of trailing edge margin Follow the procedure below when the correct trailing edge margin (border erase width) cannot be obtained in border erase mode. Sim. 59 Sim. 58 Sim. 53 Sim. 55 Sim. 56 (p. 3-3-7) (p. 3-3-22) (p.
Page 310 340-3 (5) Checking drum surface potential Follow the procedure below after replacing the drum, LPH and drum potential sensor. Procedure Approx. 3 cm Start. Enter simulation mode. Input “103” with the numeric keys. Press the enter key.* The test pattern Test pattern 2 Test pattern 3 Test pattern 1...
Page 311: Exposure And Original Feed Section
340-3 3-3-4 Exposure and original feed section (1) Attachment and removal of fluorescent lamp Follow the procedure below when cleaning or replacing the fluorescent lamp. Caution: After cleaning or replacing the fluorescent lamp, select copy contrast indicator 4 and make a test copy to check the image in each original mode.
Page 312 340-3 4. Remove the four screws and the right and left contact glass retainers. 5. Remove the contact glass. 6. Remove the hinge left cover and upper left cover. Screws Contact glass retainer Hinge left cover Upper left cover Contact glass Screws Contact glass Contact glass retainer...
Page 313 340-3 7. Remove the two screws securing the fluorescent lamp socket mount at the machine left. 8. Remove the fluorescent lamp by pulling it out of the fluorescent lamp heater. • When reattaching the fluorescent lamp, be sure to orient it with the manufacturer's mark on the right side of the copier.
Page 314 340-3 (2) Adjustment of 100% magnification Follow the procedure below when the magnification is not obtained. Caution: • Select the 2nd roll unit to carry out test copying for roll paper feed adjustment. The difference in magnification in normal copy operation for each roll unit is minimized by adjusting with the 2nd roll unit selected (as standard selection).
Page 315 340-3 (3) Adjustment of leading edge registration Follow the procedure below when there is a regular error between the leading edges of the original and the copy image. Sim. 53 Sim. 57 Sim. 54 (p. 3-3-22) (p. 3-3-5) Caution: • Before starting this adjustment, ensure that all the adjustments in the above simulations are completed.
Page 316 340-3 (4) Adjustment of exposure amount Follow the procedure below when cleaning or replacing the fluorescent lamp and contact glass, or when an image error occurs on test copies. Also, perform when it is not possible to obtain a good copy image when a correct mode is selected for the original.
Page 317 340-3 • Adjustment for half tone mode Required originals • When adjusting in the normal original mode: Test chart • When adjusting in the dark original mode: Dark poster • When adjusting in the light original mode (dark background): Map •...
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Page 319 340-3 • Adjustment of AE optimum level Caution: Do not change the MAX mode settings. Procedure Start. Enter simulation mode. Input “142” with the numeric keys. Press the enter key. Select the original mode to be adjusted with the leading edge margin or left margin key. POINT (PLAIN): normal original mode POINT (DARK): dark original mode POINT (LIGHT): light original mode...
Page 320 340-3 Examples of required originals and correct images Ajustment for normal original mode: MAX (PLAIN) POINT (PLAIN) POINT • Few black solid areas • Comparatively many black solid areas • Clear high contrast black lines or • High contrast solid black lines or characters characters Example: Posters...
Page 321 340-3 • Setting AE fine adjustment intervals Follow the procedure below when the copy density range is too narrow after the copy density has been adjusted with the copy contrast keys in auto contrast mode. Required original • Test chart Procedure Start.
Page 322 340-3 (5) Half tone mode image quality adjustment Follow the procedure below to adjust the image density to make clear copies of originals with characters and photographs or dark posters in half tone mode. • Adjusting for half tone light original mode Required original •...
Page 323 340-3 • Adjusting for half tone dark original mode Required original • Dark poster Procedure Start. Enter simulation mode. Input “141” with the numeric keys. Correct image Incorrect image Press the enter key. Figure 3-3-20(g) Select “HALF D” with the leading edge margin or left margin key.
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Page 325 340-3 (6) Image contrast adjustment (adjustment of filter gain) Follow the procedure below to make characters clear. • Adjustment for black & white (character) mode Required original • Test chart Procedure Start. Insert the original and make a test copy. Correct image Incorrect image Is the image contrast...
Page 326 340-3 • Adjustment for half tone light original mode (dark background) Required original • Map Procedure Start. Insert the original and make a test copy. Correct image Incorrect image Is the image contrast correct? Figure 3-3-20(i) Enter simulation mode. Input “144” with the numeric keys. Press the enter key.
Page 327 340-3 • Adjusting for half tone light original mode (light background) Required original • Test chart Procedure Start. Insert the original and make a test copy. Is the tone grada- Correct image Incorrect image tion clear? Figure 3-3-20(j) Enter simulation mode. Input “144”...
Page 328 (7) Image focus adjustment (LPH height adjustment) Perform after replacing the LPH. Procedure 1. Enter simulation mode. 2. Input “158” with the numeric keys. 3. Press the enter key. A test pattern is printed out. Figure 3-3-21 Test pattern 4. Using a magnifier, check if the lines of the smaller pattern are clearly printed. 5.
Page 329 340-1 8. Close the LPH lower partition and retighten the three screws. 9. Refit the developing assembly to the main unit. 10. Press the enter key and check the test pattern printout. 11. Adjust the height of the LPH by turning the adjustment pins on the machine right and left.
Page 330 340-1 (8) Replacement of the ISU PCB Procedure 1. Open the main unit. 2. Remove the three screws and pull out the ISU mount. 3. Remove all the connectors inserted into the ISU PCB. 4. Remove the four screws and the ISU PCB. ISU PCB ISU mount Figure 3-3-24...
Page 331 340-1 (9) Replacing the LED printhead and LPHROM PCB Replace the LED printhead as follows. Caution: Always replace the LED printhead and LPHROM PCB as a set. After replacing the LED printhead, be sure to adjust the image focus (simulation No. 158: see page 3-3-28). Procedure 1.
Page 332 340-1 5. Remove the two pins. 6. Remove the 8P and 60P connectors. 7. Take out the LED printhead. LED printhead 8P connector 60P connector Figure 3-3-25 (c) 8. Remove the seven screws and the main PCB cover. 9. Remove the two screws, and remove the LPHROM PCB connectors from the main PCB. Screws Screws LPHROM PCB...
Page 333 340-1 10. Remove the four screws and then the LPH right and left positioning plates & LPH cleaning spring plate. 11. Remove the LPH cleaning lever. Screws LPH left Screw positioning plate LPH cleaning spring plate Screw LPH right positioning plate LPH cleaning lever LED printhead Figure 3-3-25 (e)
Page 334 340-1 (10) Cleaning the LED printhead Perform the following cleaning when the copy image is faint or a white line appears longitudinally. Procedure 1. Detach the cleaning assembly, drum and developing assembly. 2. Remove the three screws and open the LPH lower partition. 3.
Page 335 340-1 (11) Replacement of the contact image sensor Replace the contact image sensor as follows. Procedure 1. Detach the cleaning assembly and drum. 2. Open the upper right side cover (one screw) and detach the lower left cover, operation unit, left center original cover, right center original cover, hinge left cover, hinge right cover, upper left cover and upper right cover.
Page 336 340-1 6. Remove the two pins and the ISU mount. ISU mount Figure 3-3-25 (i) 7. Remove the four bundles of contact image sensor wires from the five wire retainers. Wire retainers Figure 3-3-25 (j) 3-3-30-6...
Page 337 340-1 8. Remove the seven screws from the original front guide. Original front guide Screws Screw Screws Screw Screw Figure 3-3-25 (k) 9. Remove the two screws holding the contact image sensor. Contact image sensor Screw Screw Figure 3-3-25 (l) 3-3-30-7...
Page 338 340-1 10. Detach the contact image sensor from the main unit. Contact image sensor Figure 3-3-25 (m) 11. Refit all the removed parts. Caution: Refit the four bundles of contact image sensor wires so that numbers 1 to 4 indicated on the connectors match the connector numbers CN1 to CN4 on the ISU PCB.
Page 339 340-3 (12) Adjustment of optical axis Follow the procedure below if there is a regular error between the centers of the original and the copy image on the paper. Procedure Start. Enter simulation mode. Original Copy example 1 Copy example 2 Input “132”...
Page 340 340-3 (13) Adjustment of the image width in the main scanning direction Follow the procedure below to widen the maximum print width of LPH when the right or left edge of the copy image is not printed after the optical axis has been adjusted in simulation 132.
Page 341 340-3 (14) Adjustment for prescan in reduction copy mode Follow the procedure below if a trailing edge margin appears when carrying out synchro cut copy in reduction copy mode. Procedure Start. Trailing edge margin Enter simulation mode. Original Copy example Input “025”...
Page 342 340-3 (15) Setting the shading mode Follow the procedure below to set the exposure lamp light intensity for shading if soil on the contact glass causes longitudinal lines on the copy image. Required original • Test chart Procedure Start. Enter simulation mode. Original Copy example 1 Copy example 2...
Page 343: Developing Section
3-3-5 Developing section (1) Changing developer Follow the procedure below when replacing the developer. Procedure 1. Remove the lower rear cover. 2. Put the plastic bag in the developer collection box. Plastic bag Developer collection box Figure 3-3-26 3. Open the upper right side cover. 4.
Page 344 340-3 5. Close the upper right side cover. 6. Remove the 3P connector of the toner feed motor. 7. Enter simulation mode. 8. Perform simulation “41” (forced stabilization). 9. Perform simulation “10” (drive motor operational check). • The main unit starts operation and the developer is ejected from the developing assembly into the plastic bag in the developer collection box.
Page 345 (2) Adjustment of doctor blade: reference Perform when carrier or dark background appears on copies, or when attaching or removing the doctor blade. Procedure 1. Remove the developer from the developing assembly. (Follow steps 1 to 14 of changing developer on page 3-3-31.) 2.
Page 346 4. Loosen the six doctor blade adjustment screws on the upper developing unit stay. Doctor blade adjustment screws Figure 3-3-30 5. Insert a thickness gauge into the five points indicated in the diagram and adjust the gap between the doctor blade and the developing roller to the individually specified distances by turning adjustment screws 1 and 2.
Page 347 (3) Adjustment of position for magnetic brush: reference Check or adjust when the image is faint. Caution: Before adjusting, check that the position of the doctor blade is correct and that there is the right amount of developer. Procedure 1. Detach the toner hopper assembly from the developing assembly. 2.
Page 348 (4) Replacement of the lower developing seal Replace the lower developing seal as follows. Procedure 1. Peel the lower developing seal off the developing assembly. 2. Attach the new lower developing seal to the developing assembly using double-sided tape. • Ensure the ends of the seal are aligned with the inner edges A and B of the right and left developing unit frames so the seal does not crease.
Page 349: Transfer/Separation Section
340-1 3-3-6 Transfer/separation section (1) Replacement of charger wire Follow the procedure below when the charger wire is broken or when replacing the wire. Caution: • Use the specified tungsten wire for the charger wire. (Item No. 74716280, Anodized tungsten wire, 0.08 mm) •...
Page 350 3. Remove the transfer inner shield from the transfer outer shield. Transfer outer shield Transfer inner shield Figure 3-3-35 4. Remove the right and left transfer charger lids and the left and right transfer seals. 5. Remove the charger spring from the pin inside the transfer charger left housing and loosen the screw to remove the charger wire.
Page 351 6. Wind the tungsten wire 4-5 times around one end of the charger spring and hang the charger spring on the protrusion inside the transfer charger left housing. 7. Pass the tungsten wire under the washer and tighten with the screw keeping the charger wire stretched so that the charger spring is at least 16 mm long.
Page 352 (2) Replacement of transfer wire Follow the procedure below when the transfer wire is broken or when replacing the wire. Caution: • Approximately 3.0 m of wire is required to replace the transfer wire. • Use the specified wire (Item No. 74716290). Procedure 1.
Page 353 4. Hook the transfer wire onto the claw and thread it through the grooves of the transfer outer shield. Cross the wire at the 16th pin as shown below and continue to thread the wire. • When wiring at the last claw, pass the transfer wire through the insulating tube so that the insulating tube is in the position shown in the figure.
Page 354: Cleaning Section
3-3-7 Cleaning section (1) Attachment and removal of the cleaning blade Follow the procedure below when replacing the cleaning blade. Caution: Coat the cleaning blade with toner (simulation No. 40) after replacing it. Procedure 1. Remove the main charger assembly from the cleaning assembly. 2.
Page 355 340-1 4. Remove the stop rings on the left and right side and remove the bearings. 5. Remove the screw on the cleaning seal left and right attachment plates. Cleaning blade Bearing Stop ring Cleaning seal right attach- ment plate Cleaning blade Stop ring Bearing...
Page 356 9. Remove the weight mount (two screws) from the cleaning blade and fit it to the new blade. Weight mount Cleaning blade Figure 3-3-46 10. After replacement, return the parts to their original positions. Caution: When refitting the cleaning seal right and left attachment plates, ensure the right and left cleaning seals (red) are not overriding the seal parts of the lower cleaning blade.
Page 357 340-1 (2) Attachment and removal of lower cleaning blade Follow the procedure below when replacing the lower cleaning blade. Procedure 1. Loosen the four screws (1 each on right and left, 2 in the center) and remove the lower cleaning blade. Lower cleaning blade Figure 3-3-48 2.
Page 358: Fur Brush Gear
340-1 (3) Attachment and removal of cleaning fur brush Follow the procedure below when cleaning or replacing the cleaning fur brush. Procedure 1. Remove the cleaning blade. 2. Remove the stop ring and then remove fur brush gear 17, the shim, pin and the bearing. Fur brush gear 17 Bearing Shim...
Page 359 (4) Attachment and removal of separation claw Follow the procedure below when replacing the separation claw. Procedure 1. Remove the screws on the separation spring. Separation shaft Separation spring Figure 3-3-51 2. Remove the separation claw guide. 3. Move the separation claw to the D-cut section of the separation shaft and remove the separation claw from the separation shaft.
Page 360: Fixing Section
340-1 3-3-8 Fixing section (1) Attachment and removal of fixing heaters M and S Follow the procedure below when inspecting or replacing fixing heaters M and/or S. Procedure 1. Detach the upper right removal cover, upper left removal cover, lower right removal cover, and lower left removal cover.
Page 361 (2) Attachment and removal of heat roller Follow the procedure below when cleaning or replacing the heat roller. Procedure 1. Remove fixing heaters M and S (see page 3-3-48). 2. Press the fixing section release lever to open the fixing section. 3.
Page 362 340-1 6. Remove the middle removal cover. 7. Remove the 2P connector of the eject switch, the 3P connector of the fixing unit pulse sensor, the two screws and the upper eject guide. 3P connector Upper eject guide 2P connector Figure 3-3-56 8.
Page 363 340-3 9. Remove the C-ring, the bearing retainer (two screws) and the heat roller bearing on the heat roller right side. 10. Remove the heat roller. Heat roller bearing C-ring Heat roller Bearing retainer Figure 3-3-58 11. After cleaning or replacement, return the parts to their original positions. Important: After replacement of the heat roller, the separation claws may leave lines on solid black copies if sufficient silicon oil is not applied on the roller surface.
Page 364 340-3 (3) Attachment and removal of the press roller Follow the procedure below when cleaning or replacing the press roller. Procedure 1. Remove the left and right fixing unit release sliders from the upper release pivot pin and open the fixing section all the way (see page 3-3-49). 2.
Page 365 (4) Attachment and removal of oil roller Follow the procedure below when replacing the oil roller. Procedure 1. Detach the upper right removal cover, upper left removal cover, lower right removal cover, and lower left removal cover. 2. Remove the four screws and the 4P and 5P connectors and then detach the original table assembly.
Page 366 4. Remove the crimp springs on the right and left of the oil roller. Crimp spring Figure 3-3-63 5. Loosen the hex-socket-head screw and remove gear 27T from the left of the oil roller. 6. Remove the E-rings on the left and right of the oil roller and remove the bearings. E-rings Bearing Hex-socket-head screw...
Page 367 7. Remove the oil roller. Oil roller Figure 3-3-65 8. After replacement, return the parts to their original positions. 3-3-55...
Page 368 (5) Attachment and removal of fixing unit thermistors 1 and 2 Follow the procedure below when inspecting or replacing fixing unit thermistors 1 or 2. Procedure 1. Remove the upper right removal cover, upper left removal cover, lower right removal cover, and lower left removal cover.
Page 369 (6) Attachment and removal of fixing unit thermal switches 1 and 2 Follow the procedure below when inspecting or replacing fixing unit thermal switches 1 or Caution: • When replacing the fixing unit thermal switches (thermostats), be sure to use the specified parts.
Page 370 (7) Attachment and removal of fixing unit thermistors 3 and 4 Follow the procedure below when inspecting or replacing fixing unit thermistors 3 or 4. Procedure 1. Remove the left and right fixing unit release sliders from the upper release pivot pin and open the fixing section all the way (see page 3-3-49).
Page 371 (8) Attachment and removal of the external temperature thermistor Follow the procedure below when inspecting or replacing the external temperature thermistor. Procedure 1. Remove the lower left cover. 2. Remove the screw and the 2P connector and remove the external temperature thermistor.
Page 372: Other Sections
3-3-9 Other sections (1) Adjusting the tension of paper feed section drive belt 1 Follow the procedure below when attaching or removing the paper feed motor or when replacing paper feed section drive belt 1. Procedure 1. Remove the lower left cover. 2.
Page 373 (2) Adjusting the tension of paper feed section drive belt 2 [when installing 3rd roll unit (optional) only.] Follow the procedure below when replacing paper feed section drive belt 2. Procedure 1. Remove the lower left cover. 2. Loosen the screw on paper feed drive tension plate 2. 3.
Page 374 (3) Adjusting the tension of the cutter drive belt Follow the procedure below when attaching or removing the cutter unit or when replacing the cutter drive belt. Procedure 1. Remove the lower left cover. 2. Loosen the screw on the cutter drive tension plate. 3.
Page 375 340-3 (4) Adjusting the tension of original feed drive belt 1 Follow the procedure below when attaching or removing the original feed clutch or when replacing original feed drive belt 1. Procedure 1. Open the upper right side cover. 2. Loosen the two screws on the original drive tension plate. 3.
Page 376 340-1 (4-1) Adjusting the tension of the developing drive belt Follow the procedure below when replacing the developing drive belt. Procedure 1. Remove the lower left cover. 2. Loosen the screw holding the developing drive tension plate. 3. Retighten the screw with the edge of the developing drive tension plate aligned with the center of the hole in the developing drive mount.
Page 377 340-1 This page is intentionally left blank. 3-3-65...
Page 378 (5) Attachment and removal of ozone filter Follow the procedure below when replacing the ozone filter. Procedure 1. Open the main unit. 2. Remove the lower left cover. 3. Remove the screw and then the ozone filter retainer. 4. Remove the screw and the ozone filter. Ozone filter Ozone filter retainer Figure 3-3-74...
Page 379: Pcb Initial Settings
CONTENTS 3-4 PCB Initial Settings 3-4-1 Main PCB .................... 3-4-1 3-4-2 Non-field-adjustable volume controls ..........3-4-3 1-1-25...
Page 381 3-4-1 Main PCB When replacing the main PCB, simply fit the backup PCB that was attached to the old main PCB to the new main PCB. However, if the backup PCB is going to be replaced, it is necessary to take the following procedure. Procedure •...
Page 382 340-3 • With the new backup PCB 7. Connect the power plug and turn the copier main switch on. 8. Enter the simulation mode. 9. Run simulations 70 and 85. 10. Clean the contact glass and middle upper original roller. 11.
Page 383: Non-Field-Adjustable Volume Controls
340-3 Sim. No. Contents Adjusting the image width in the main scanning direction Adjusting exposure amount Adjusting half-tone image quality (dark/light) Adjusting AE optimum level Switching filter modes Adjusting filter gain Setting AE fine adjustment intervals Selecting current correction value Adjusting base 4 output density Adjusting thresholds (central exposure level) Adjusting Exp.
Page 384 1-1-26...
Page 385: Self Diagnostics
CONTENTS 3-5 Self Diagnostics 3-5-1 Self-diagnostic function ............... 3-5-1 (1) Self-diagnostic display ..............3-5-1 1-1-27...
Page 387 3-5-1 Self-diagnostic function (1) Self-diagnostic display This unit is equipped with a self-diagnostic function. When it detects a problem with itself, it disables copying and displays a self-diagnostic code (SC-xxx) indicating the nature of the problem together with the message requesting to call for service on the display. To reset SC302, 340, 355, 401, 601, 690, 900, 921,990 or 991turn the main switch off then on.
Page 388 340-3 Self diagnostic codes Remarks Code Contents Check procedures/ Causes corrective measures Backup RAM problem The SRAM Run simulation 70 and reset Collapse in data pattern of (IC1, IC3) on the memory contents. the specified area of the the backup RAM has been found dur- PCB has a ing 20-s-interval detection...
Page 389 340-3 Remarks Code Contents Check procedures/ Causes corrective measures Interface controller com- Poor contact Check the connection of C-33 munication problem in the connec- CON3 on the interface PCB Communication between tor terminals and continuity across the the copier and interface of CON3 on connector terminals.
Page 390 340-3 This page is intentionally left blank. 3-5-4...
Page 391 340-1 Remarks Code Contents Check procedures/ Causes corrective measures IPC1 problem The main Replace the main PCB and Processing request given PCB is defec- check operation. to communication CPU tive. IC22 fails to be processed within 512 ms. IPC2 problem The main Replace the main PCB and Processing request given...
Page 392 340-1 Remarks Code Contents Check procedures/ Causes corrective measures Transfer charger leakage The transfer Check the transfer charger The shorting alarm signal charger leaks. assembly and clean if neces- (ST ALARM) is detected sary. six times in succession The transfer Check if the transfer charger while the transfer charger charger wire...
Page 393 Remarks Code Contents Check procedures/ Causes corrective measures Dark potential correction The drum Check the connector termi- problem: No. of correc- potential sen- nals and repair if necessary. tions expired sor connector Ten corrections cannot terminals achieve normal correction. make poor contact.
Page 394 Remarks Code Contents Check procedures/ Causes corrective measures Abnormally low tempera- Fixing heater Check for continuity. If none, ture at fixing heater M M has a replace fixing heater M. Fixing temperature drops break. to less than 100°C/212°F Fixing heater Check the connectors and after reaching the M connector...
Page 395 340-1 Remarks Code Contents Check procedures/ Causes corrective measures Abnormally high tempera- Fixing unit Measure the resistance and if 0 Ω, replace the thermistor. ture at fixing heater M thermistor 1 Fixing temperature ex- has shorted. ceeds 195°C/385°F after Solid state Measure the resistance and reaching the stabilization relay 1 is de-...
Page 396 340-1 Remarks Code Contents Check procedures/ Causes corrective measures Abnormally low fixing Fixing heater Check for continuity. If none, temperature M or S has a replace fixing heater M or S. Both fixing heaters M and break. S remain at less than Fixing heater Check the connector termi- 80°C/176°F after 6 min-...
Page 397 340-3 Remarks Code Contents Check procedures/ Causes corrective measures Abnormally high toner The toner Replace the toner sensor sensor output sensor is de- and check operation. Abnormally high value fective. (F9h or greater) has been The main Replace the main PCB and detected five times in suc- PCB is defec- check operation.
Page 398 Remarks Code Contents Check procedures/ Causes corrective measures Total Counter Problems The total counter Check the connectors of the total counter and remedy the connection if necessary. connectors are OFF or connector terminals make poor contact. 3-5-9-1...
Page 399 CONTENTS 3-6 Troubleshooting 3-6-1 Image formation problems ..............3-6-1 (1) No image (entirely white)............. 3-6-4 (2) No image (entirely black)............. 3-6-5 (3) Image is too light................. 3-6-6 (4) Background is visible..............3-6-7 (5) A white line appears longitudinally..........3-6-8 (6) A black line appears longitudinally.
Page 400 340-3 (7) Operation unit PCB ..............3-6-35 (8) Inverter PCB ................3-6-36 (9) ISU PCB ..................3-6-37 3-6-4 Electrical problems ................3-6-38 (1) The machine does not operate at all when the main switch is turned on................... 3-6-38 (2) The drive motor does not operate..........3-6-39 (3) The drum motor does not operate.
Page 401 (3) No original conveying..............3-6-52 (4) Original jam................3-6-53 (5) Paper jam.................. 3-6-53 (6) Toner falls onto the paper conveying section......3-6-54 (7) Abnormal noise................. 3-6-54 1-1-31...
Page 403: Image Formation Problems
3-6-1 Image formation problems (1) No image (entirely (2) No image (entirely (3) Image is too light. white). black). See page 3-6-4. See page 3-6-5. See page 3-6-6. (4) Background is visible. (5) A white line appears (6) A black line appears longitudinally.
Page 404: Image Is Blurred
(10) Image is blurred. (11) The leading edge of (12) The leading edge of the image is consist- the image is sporadi- ently misaligned with cally misaligned with the original. the original. See page 3-6-11. See page 3-6-11. See page 3-6-12. (13) Paper creases.
Page 405 (19) One forth the A0 (20) One forth the A0 width of the image width of the image is white. is black. See page 3-6-15. See page 3-6-16. 3-6-3...
Page 406 (1) No image Causes (entirely white). 1. No transfer charging. 2. LPH fails to turn on. Causes Check procedures/corrective measures 1. No transfer charging. A. Broken transfer Replace the wire. charger wire. B. Leaking transfer Clean the transfer charger housing. charger housing.
Page 407 340-3 (2) No image Causes (entirely black). 1. Fluorescent lamp fails to light. 2. No main charging. 3. Loose LPH data wire connectors. 4. Defective main PCB. 5. Defective LPH. 6.Loose ISU data wire connectors. 7.Defective ISU PCB. Causes Check procedures/corrective measures 1.
Page 408 340-3 Causes Check procedures/corrective measures Run simulation 159. If no test pattern is output, check the 3. Loose LPH data wire connection of the LPH data wire connectors and remedy if connectors. necessary. Run simulation 159. If no test pattern is output after the 4.
Page 409 340-3 (4) Background is visible. Causes 1. Dirty lens array in the CIS. 2. Deteriorated developer. 3. Misadjusted fluorescent lamp intensity. 4. Misadjusted developing section. 5. Misadjusted drum surface potential. 6. Dirty main charger shield. Causes Check procedures/corrective measures 1. Dirty lens array in the Clean the lens array in the CIS.
Page 410 (5) A white line appears Causes longitudinally. 1. Dirty or flawed main charger grid. 2. Foreign matter in the developing section. 3. Flawed drum. 4. Dirty contact glass. 5. Dirty middle upper original roller. 6. Dirty LPH. Causes Check procedures/corrective measures 1.
Page 411 340-3 (7) A black line appears Causes laterally. 1. Flawed drum. 2. Dirty developing section. Causes Check procedures/corrective measures 1. Flawed drum. Replace the drum (see page 3-3-10). 2. Dirty developing Clean the developing section. section. 3-6-9...
Page 412 (8) One side of the copy Causes image is darker than 1. Dirty main charger wire. the other. 2. Dirty lens array in the CIS. 3. Defective fluorescent lamp. Causes Check procedures/corrective measures 1. Dirty main charger Clean the main charger wire. If it is extremely dirty, replace wire.
Page 413 (10) Image is blurred. Causes 1. Original is conveyed erratically. 2. Deformed press roller. 3. Paper conveying drive system problem. Causes Check procedures/corrective measures 1. Original is conveyed erratically. A. Dirty or deformed Clean or replace any of the front upper, middle upper, rear front upper, middle upper, front lower and rear lower original rollers if upper, rear upper,...
Page 414 340-1 (12) The leading edge of Causes the image is spo- 1. Registration clutch or bypass registration clutch radically misaligned installed or operating incorrectly. with the original. 2. Original feed clutch installed or operating incorrectly. 3. Loose original feed drive belt 1. Causes Check procedures/corrective measures 1.
Page 415 (14) Offset occurs. Causes 1. Defective cleaning blade. 2. Cleaning solenoid malfunctioning. 3. Post-transfer lamp fails to light. Causes Check procedures/corrective measures 1. Defective cleaning Replace the cleaning blade (see page 3-3-42). blade. 2. Cleaning solenoid Run simulation 45 and if the cleaning solenoid does not malfunctioning.
Page 416 (16) Fixing is poor. Causes 1. Wrong paper. 2. Misadjusted fixing pressure. 3. Misadjusted fixing temperature. 4. Flawed press roller. Causes Check procedures/corrective measures 1. Wrong paper. Check if the paper meets specifications. 2. Misadjusted fixing Check if the fixing unit pressure adjustment nuts are pressure.
Page 417: One Forth The A0 Width Of The Image Is White
(18) The center of the Causes image is misaligned 1. Paper roll is not installed correctly on the roll shaft. with the original. 2. Paper is not placed correctly on the bypass table. 3. Original is not placed correctly. Causes Check procedures/corrective measures 1.
Page 418: One Forth The A0 Width Of The Image Is Black
340-2 (20) One forth the A0 Causes width of the image 1. Defective CIS or ISU PCB. is black. 2. Defective LPH. Causes Check procedures/corrective measures 1. Defective CIS or ISU Change the connections of CN1, CN2, CN3 and CN4 of PCB.
Page 419: Paper Misfeeds
3-6-2 Paper misfeeds Problem Causes/check procedures Corrective measures A piece of paper torn from copy Check and remove it, if any. J-04 appears paper is caught around the by- as soon as pass registration roller along the main the paper conveying path. switch is Defective bypass registration If CN3-14 on the main PCB...
Page 420: Copying Frequently
Problem Causes/check procedures Corrective measures Defective eject switch. If CN3-16 on the main PCB J-06 appears remains low when the eject as soon as switch is turned on and off, re- the main place the eject switch. switch is turned on. Wrong paper.
Page 421: Copying Frequently
Problem Causes/check procedures Corrective measures Wrong paper. Check and, if the paper is ex- Paper jam in tremely curled or inappropriate the 2nd roll for copying, change it. unit (J-02) A piece of paper torn from copy Check and remove it, if any. occurs during paper is left along the paper con- copying fre-...
Page 422 Problem Causes/check procedures Corrective measures The roll paper feed upper roller Check and replace the roll pa- Paper jam in of the 3rd roll unit is deformed per feed upper roller if neces- the 3rd roll or worn. sary. unit (optional) Broken registration switch ac- Check and, if the actuator is (J-03) occurs...
Page 423 Problem Causes/check procedures Corrective measures A piece of paper torn from copy Check and remove it, if any. Paper jam paper is left along the paper inside the conveying path between the main unit registration roller and eject (J-06) occurs roller.
Page 424 Problem Causes/check procedures Corrective measures Defective fixing unit pulse sen- If the level of CN3-17 on the Paper jam sor. main PCB does not change inside the when the fixing unit pulse sen- main unit sor is turned on and off, replace (J-06) occurs the fixing unit pulse sensor.
Page 425: Pcb Terminal Voltages
3-6-3 PCB terminal voltages Precautions • When handling the circuit boards, do not touch the components wth bare hands. • ICs can be damaged by static discharges. If a PCB contains ICs, do not touch the ICs, cable connectors or edge connectors. •...
Page 426 Y E C FS-1V 7000267L-C U-2 MADE IN JAPAN C5 R14 FS-1V MADE IN JAPAN Y E C 7000268L-B Terminals (CN) Voltage Remarks Local voltage AC supply, input 24 V DC 24 V DC supply, output 3-1, 2, 3, 4 3-5, 6, 7, 8 24 V DC 24 V DC supply, output 4-1, 2, 3, 4 4-5, 6 24 V DC...
Page 427: Lph Power Source Pcb
(2) LPH power source PCB Y E C 6000727L-C 3402806 MADE IN JAPAN F1 10A/125V WARNING FOR CONTINUED PROTECTION AGAINST RISK OF FIRE,REPLACE ONLY WITH SAME TYPE AND RATING OF FUSE. Terminals (CN) Voltage Remarks 24 V DC 24 V DC supply, input B-5, 6, 7, 8 5 V DC 5 V DC supply to LPH, output B-5, 6, 7, 8 5 V DC...
Page 428: Main Pcb
(3) Main PCB ZMCG43 M3881M2-061FP 3-6-26...
Page 429 340-3 Terminals (CN) Voltage Remarks 5-6, 7 +12 V DC +12 V DC supply, input 5-6, 7 –12 V DC –12 V DC supply, input DTH detection, input FTH1 detection, input FTH2 detection, input FTH3 detection, input FTH4 detection, input 2-10 ETTH detection, input 2-14...
Page 430 340-3 Terminals (CN) Voltage Remarks 3-22 5-6, 7 0/5 V DC OSSW2 on/off, input 3-23 5-6, 7 0/5 V DC OFM SPEED1, output 3-24 5-6, 7 0/5 V DC OFM ENA, output 3-25 5-6, 7 0/5 V DC OFM SPEED2, output 3-26 5-6, 7 0/5 V DC...
Page 431 340-3 Terminals (CN) Voltage Remarks 4-12B 5-2, 3 0/15.5 V DC RTL on/off control, output 4-13B 5-2, 3 0/15.5 V DC FLH on/off control, output 4-14B 5-2, 3 0/24 V DC RH-M on/off, output 4-17B 5-2, 3 24 V DC 24 V DC supply, input 5-2, 3 24 V DC...
Page 432 340-3 Terminals (CN) Voltage Remarks 7-16 5-6, 7 0/5 V DC (pulse) PS-M detection, input *1, 2 7-17 5-6, 7 0/5 V DC (pulse) PS-L detection, input 7-18 5-6, 7 0/5 V DC PSSW1-M on/off, input 7-19 5-6, 7 0/5 V DC PSSW2-M on/off, input 7-20 5-6, 7...
Page 433: Servo Motor Control 1 Pcb
340-2 (4) Servo motor control 1 PCB TR13 TR11 TR10 TR14 Terminals (CN) Voltage Remarks 24 V DC DM drive, output 0.5 V AC (sinusoidal) DM FG, input 24 V DC 24 V DC supply, input 5 V DC 5 V DC supply, input 0/5 V DC DM drive/stop control, input 0/5 V DC (pulse)
Page 434: Servo Motor Control 2 Pcb
(5) Servo motor control 2 PCB 6172802 KU-42294V-O H µPC393 IC15 TD62304 74HC14 IC10 IC11 TR14 IC12 µPC393 IC13 74HC16 IC14 FUSE1 125V 5A FUSE2 125V 5A TR15 TC57256AD-15 WARNING FOR CONTINUED PROTECTION AGAINST RISK OF FIRE. REPLACE ONLY WITH SAME TYPE AND RATING OF FUSE. Terminals (CN) Voltage Remarks...
Page 435: Output Pcb
(6) Output PCB 3-6-33...
Page 436 Terminals (CN) Voltage Remarks 24 V DC 24 V DC supply, output 24 V DC 24 V DC supply, output 24 V DC 24 V DC supply, output 24 V DC 24 V DC supply, output 24 V DC 24 V DC supply, output 24 V DC 24 V DC supply, output 24 V DC...
Page 437: Operation Unit Pcb
(7) Operation unit PCB LED1 LED4 LED2 LED3 LED23 LED14 LED18 LED5 LED10 SW16 SW11 LED24 LED42 LED6 LED15 LED19 LED43 SW17 SW12 LED25 LED7 LED11 LED16 LED20 SW10 SW18 LED8 LED12 SW13 LED13 LED22 LED9 LED17 LED21 SW14 SW26 SW27 SW28 SW22...
Page 438: Inverter Pcb
(8) Inverter PCB For continued protection against MATSUSHITA ELECTRIC WORKS, LTD. CAUTION risk of fire. Repiase only with same type and ratings of fuse. R20 C9 R13-1 R13-2 Vrem T125V 3A 960903 R14 C6 R9 C2 Q3 R1 R2 R5 R6 R7 R8 R3 R4 Model No.CHF651HPA-20M DC24V 1.6A 3402807...
Page 439: Isu Pcb
(9) ISU PCB C100 C108 C109 C120 C121 C134 C132 NF63 NF62 NF64 NF61 IC11SHDG43 NF60 NF29 M380221-4SKT Terminals (CN) Voltage Remarks 5/0 V DC (pulse) ISUPCB serial communication, output 5/0 V DC (pulse) ISUPCB serial communication, input 5/0 V DC ISUPCB reset, input 0/5 V DC ISUPCB connected/not connected...
Page 440: Electrical Problems
3-6-4 Electrical problems Problem Causes Check procedures/corrective measures There is no power Measure the input voltage. The machine at the wall outlet. does not op- The power plug is Check that the power cord is firmly con- erate at all not connected cor- nected to the outlet.
Page 441: The Drum Motor Does Not Operate
340-2 Problem Causes Check procedures/corrective measures The drive motor Check for continuity across the coil. If none, The drive mo- coil is broken. replace the motor. tor does not Run simulation 10. If no clock pulse is output The main PCB is operate.
Page 442 340-1 Problem Causes Check procedures/corrective measures The paper feed Check for continuity across the coil. If none, The paper motor coil is bro- replace the motor. feed motor ken. does not op- The main PCB is Run simulation 11 and check if CN3-29 on erate.
Page 443 340-3 Problem Causes Check procedures/corrective measures The paper convey- Run simulation 18. If CN4-6A on the main The paper ing fan motor is PCB goes low but the paper conveying fan conveying fan defective. motor does not rotate, replace the motor. motor does The main PCB is Run simulation 18.
Page 444 Problem Causes Check procedures/corrective measures (13) The middle roll Check for continuity across the coil. If none, The middle winding clutch coil replace the clutch. roll winding is broken. clutch does The connector Check for continuity across the terminals. If not operate.
Page 445: The Cutter Clutch Does Not Operate
Problem Causes Check procedures/corrective measures (17) The lower feed Check for continuity across the coil. If none, The lower clutch coil is bro- replace the clutch. feed clutch ken. does not op- The connector Check for continuity across the terminals. If erate.
Page 446: The Cleaning Solenoid Does Not Operate
Problem Causes Check procedures/corrective measures (21) The bypass regis- Check for continuity across the coil. If none, The bypass tration clutch coil is replace the clutch. registration broken. clutch does The connector Check for continuity across the terminals. If not operate. terminals of the none, replace them.
Page 447 Problem Causes Check procedures/corrective measures (25) The fluorescent Check for continuity across the filament. If The fluores- lamp filament is none, replace the lamp. cent lamp broken. does not light. The fluorescent Check for continuity across the right and left lamp socket lamp sockets.
Page 448: Fixing Heater M Or S Does Not Turn On (C-630, C-631, C-640, C-641, C-650, C-660)
Problem Causes Check procedures/corrective measures (29) Fixing heater M or Check for continuity across the terminals. If Fixing heater S has a break. none, replace the heater. M or S does Fixing unit thermal Check for continuity across the terminals. If not turn on switch 1 or 2 is none, locate and remove the cause of the...
Page 449: No Main Charging
Problem Causes Check procedures/corrective measures (31) The main charger See page 3-6-5. No main wire is broken. charging. The main charger housing leaks. The main high- voltage trans- former connectors make poor contact. The main PCB is defective. The main high- voltage trans- former is defective.
Page 450: The Job Stop/Roll Cut Key Does Not Operate
340-1 Problem Causes Check procedures/corrective measures (33) The separation Visually check. Replace the wire if neces- No separation charger wire is sary. charging. broken. The ST high-volt- Check if the connectors are securely con- age transformer nected. If not, remedy. connectors make Check for continuity across the connectors.
Page 451: The Dehumidifier Does Not Operate
Problem Causes Check procedures/corrective measures (36) The fluorescent Check the resistance across the terminals. If it is ∞ Ω, replace the heater. The fluores- lamp heater has a cent lamp break. heater does The main PCB is If the fluorescent lamp heater operates with not operate.
Page 452: The Lower Roller Unit Heater Does Not Operate
340-3 Problem Causes Check procedures/corrective measures (40) The lower roll unit Measure the resistance across the termi- nals. If it is ∞ Ω, replace the heater. The lower heater has a roller unit break. heater does The lower roll unit Check for continuity across the switch.
Page 453: Mechanical Problems
340-1 3-6-5 Mechanical problems Problem Causes/check procedures Corrective measures Check if the surface of the roll paper If they are, clean with iso- No primary feed upper roller of the 1st roll unit propyl alcohol. paper feed. and that of roll paper feed lower roller A are dirty with paper dust.
Page 454 Problem Causes/check procedures Corrective measures Check if the surface of the bypass If it is, clean with isopropyl No primary paper feed roller is dirty with paper alcohol. paper feed. dust. (cont.) Check if the bypass paper feed roller If it is, replace the roller. is deformed or worn.
Page 455 Problem Causes/check procedures Corrective measures Check if the original leading edge If CN3-12 on the main No original detection switch operates correctly. PCB does not change lev- conveying. els when the original lead- (cont.) ing edge detection switch is turned on and off, re- place the switch.
Page 456 Problem Causes/check procedures Corrective measures Check if the developing section is If it is, clean the develop- Toner falls extremely dirty. ing section and around onto the pa- that area. per conveying Check if the lower cleaning blade is If it is, replace. section.
Page 457 CONTENTS 3-7 Appendixes Timing chart No. 1 ..................3-7-1 Timing chart No. 2 ..................3-7-2 Timing chart No. 3 ..................3-7-3 Timing chart No. 4 ..................3-7-4 Timing chart No. 5 ..................3-7-5 Operation Unit PCB..................3-7-6 Power Source PCB 1/2.................. 3-7-7 Power Source PCB 2/2..................
Page 458: Preventive Maintenance
PREVENTIVE MAINTENANCE CHECK LIST A741 NOTICE: This PREVENTIVE MAINTENANCE CHECK LIST applies only to those machines that have been maintained and placed in operating environments that meet Ricoh specifications. 4-1-1...
Page 459: Preventive Maintenance Schedule
PREVENTIVE MAINTENANCE SCHEDULE CK = CHECK MODEL: A741 REGULAR PERIODIC MAINTENANCE MAINTENANCE CL = CLEAN Page 1 of 9 LU = LUBRICATION ADJ = ADJUST RE = REPLACE INST = INSTALL CHECKPOINT PART NO. REMARKS * INSTALLATION * 1 count = 1 foot of Copy Paper Feed Install at initial set-up.
Page 460 PREVENTIVE MAINTENANCE SCHEDULE CK = CHECK MODEL: A741 REGULAR PERIODIC MAINTENANCE MAINTENANCE CL = CLEAN Page 2 of 9 LU = LUBRICATION ADJ = ADJUST RE = REPLACE INST = INSTALL CHECKPOINT PART NO. REMARKS Lower Original Feed V67813211 Use Alcohol...
Page 461 PREVENTIVE MAINTENANCE SCHEDULE CK = CHECK MODEL: A741 REGULAR PERIODIC MAINTENANCE MAINTENANCE CL = CLEAN Page 3 of 9 LU = LUBRICATION ADJ = ADJUST RE = REPLACE INST = INSTALL CHECKPOINT PART NO. REMARKS Pre-Transfer Roller 3-10 V67816010 Use Alcohol...
Page 462 PREVENTIVE MAINTENANCE SCHEDULE CK = CHECK MODEL: A741 REGULAR PERIODIC MAINTENANCE MAINTENANCE CL = CLEAN Page 4 of 9 LU = LUBRICATION ADJ = ADJUST RE = REPLACE INST = INSTALL CHECKPOINT PART NO. REMARKS Main Charger Use Dry Clean Cloth. Replace with...
Page 463 PREVENTIVE MAINTENANCE SCHEDULE CK = CHECK MODEL: A741 REGULAR PERIODIC MAINTENANCE MAINTENANCE CL = CLEAN Page 5 of 9 LU = LUBRICATION ADJ = ADJUST RE = REPLACE INST = INSTALL CHECKPOINT PART NO. REMARKS Dev. Unit Ass’y V34093020 Clean with Vacuum Cleaner...
Page 464 PREVENTIVE MAINTENANCE SCHEDULE CK = CHECK MODEL: A741 REGULAR PERIODIC MAINTENANCE MAINTENANCE CL = CLEAN Page 6 of 9 LU = LUBRICATION ADJ = ADJUST RE = REPLACE INST = INSTALL CHECKPOINT PART NO. REMARKS Lower Cleaning V67818050 If toner drop noticed, replace.
Page 465 PREVENTIVE MAINTENANCE SCHEDULE CK = CHECK MODEL: A741 REGULAR PERIODIC MAINTENANCE MAINTENANCE CL = CLEAN Page 7 of 9 LU = LUBRICATION ADJ = ADJUST RE = REPLACE INST = INSTALL CHECKPOINT PART NO. REMARKS Fixing Press Roller V67820270 Use Alcohol...
Page 466 PREVENTIVE MAINTENANCE SCHEDULE CK = CHECK MODEL: A741 REGULAR PERIODIC MAINTENANCE MAINTENANCE CL = CLEAN Page 8 of 9 LU = LUBRICATION ADJ = ADJUST RE = REPLACE INST = INSTALL CHECKPOINT PART NO. REMARKS Upper roller, Roll V67807510 Use Alcohol...
Page 467 PREVENTIVE MAINTENANCE SCHEDULE CK = CHECK MODEL: A741 REGULAR PERIODIC MAINTENANCE MAINTENANCE CL = CLEAN Page 9 of 9 LU = LUBRICATION ADJ = ADJUST RE = REPLACE INST = INSTALL CHECKPOINT PART NO. REMARKS 10-0 * COPY QUALITY *...
Page 468 Intentionally left blank...
Page 469 Timing chart No. 1 From the main switch being turned on to copier stabilization DB CHG (+) CN4-4B 100 ms 100 ms 100 ms 300 ms 300 ms DB REM CN4-3B 200 ms 200 ms CN7-6 CSOL 1 CN6-5 10 min CSOL 2 CN6-4 CN7-6...
Page 470 Timing chart No. 2 Bypass paper feed, with the paper inserted before the original CN3-16 OLDSW CN3-12 OTDSW CN3-13 450 ms BYPRSW CN3-14 BYPTIMSW CN3-34 PCSW CN3-15 100 ms 100 ms DB CHG(+) CN4-4B 100 ms 200 ms 300 ms 300 ms DB REM CN4-3B...
Page 471 Timing chart No. 3 Bypass paper feed, with the original inserted before the paper CN3-16 OLDSW CN3-12 OTDSW CN3-13 450 ms BYPRSW CN3-14 BYPTIMSW CN3-34 PCSW CN3-15 100 ms 100 ms 750 ms DB CHG(+) CN4-4B 100 ms 300 ms 200 ms 300 ms DB REM...
Page 472 Timing chart No. 4 Roll unit paper feed, single copy CN3-16 OLDSW CN3-12 CN3-13 OTDSW CN3-15 PCSW CN3-11 100 ms 100 ms DB CHG(+) CN4-4B 300 ms 200 ms 100 ms 300 ms DB REM CN4-3B 200 ms CN7-6 5.2 s CN6-5 CSOL 1 CSOL 2...
Page 473 Timing chart No. 5 Roll unit paper feed, continuous two copies CN3-16 OLDSW CN3-12 CN3-13 OTDSW PCSW CN3-15 CN3-11 100 ms 100 ms CN4-4B DB CHG(+) 100 ms 300 ms CN4-3B DB REM 200 ms 200 ms 300 ms 5.25 s CN7-6 1 s 1 s 1 s 1 s CN6-5...
Page 474: Operation Unit Pcb
Operation unit PCB CN1-1 LCD MODULE CN1-3 CN1-5 CN1-7 CN1-4 OPCB RXD Key4 Dig5 Dig4 OPCB TXD CN1-2 RIGHT DT13 (1/2) P60/KR0 DT14 SW17 SW25 SW33 P61/KR1 DT15 SW10 SW18 SW26 SW34 P62/KR2 OPCB CLK CN1-6 DT16 SW11 SW19 SW27 SW35 P63/KR3 DT17...
Page 475: Power Source Pcb 1/2
Power source PCB T1 /1/3 +24V R46 C27 C28 +24V +24V +24V R8 C9 C10 LIVE +24V R53 D15 T1 2/3 C35 R54 C33 D16 +24V +24V R12 R13 +24V +24V R20 R21 +5.1V +5.1V H.B 2 H.B A +5.1V +5.1V Z2 1/2 +5.1V...
Page 476 Power source PCB 3-7-8...
Page 477: Detachable Unit Wiring Diagram
Detachable unit wiring diagram 24VR RTL REM 24VR PCFM PCFM PCFM H/L PCSW PCSW FTH3 FTH3 FTH4 FTH4 BYPTIMSW BYPTIMSW TC REM STHVT SC REM ST ALARM 24VR BLACK GRAY YELLOW GREEN BLUE WHITE BYPRSW BYPRSW PINK ORANGE LIGHT BLUE PURPLE FTH1 FTH2...
Page 479 ® ® ® MB-1 SERVICE MANUAL RICOH GROUP COMPANIES...
Page 481 CONTENTS THEORY AND CONSTRUCTION SECTION 1-1 Specifications 1-1-1 Specifications ................... 1-1-1 1-2 Handling Precautions 1-2-1 Part names ..................1-2-1 1-2-2 Mechanical construction of each section .......... 1-2-2 II ELECTRICAL SECTION 2-1 Electrical Parts Layout 2-1-1 Electrical parts layout ............... 2-1-1 2-2 Operation of the PCB 2-2-1 Memory unit main PCB ..............
Page 482 Memory unit main PCB ..............3-6-18 Wiring diagram ..................3-6-19...
Page 483: Itheory And Construction Section
THEORY AND CONSTRUCTION SECTION...
Page 484 1-1-4...
Page 485: Specifications
SPECIFICATIONS...
Page 486 1-1-4...
Page 487 1-1 Specifications 1-1-1 Specifications ..................1-1-1...
Page 489 191-1 1-1-1 Specifications Memory ........16 MB standard Options ........Addition in units of 16 MB [72-pin, 70 ns SIMM or faster (no parity; parity SIMMs can also be used)]. Maximum memory: 48 MB (3 SIMMs), 64 MB in total. Media: HDD HDD: 1 GB Interface: SCSI2...
Page 490 1-1-4...
Page 491: Handling Precautions
HANDLING PRECAUTIONS...
Page 492 1-1-4...
Page 493 1-2 Handling Precautions 1-2-1 Part names ..................1-2-1 1-2-2 Mechanical construction of each section .......... 1-2-2...
Page 495: Part Names
1-2-1 Part names Figure 1-2-1 1 Memory unit 2 Breakers 3 Power cord 4 Original guide 1-2-1...
Page 496: Mechanical Construction Of Each Section
1-2-2 Mechanical construction of each section ( 1 ) Memory unit Power supply Input image data CN2-1A~16A Main scanning direction effective image area signal CN2-17A,18A CN2-17B,18B MPCB Power (Copier) Image data transfer clock signal CN2-21A,22A supply CN2-13B,14B Auxiliary scanning synchronization signal CN2-25A,26A Main scanning CN19...
Page 497: Electrical Section
ELECTRICAL SECTION...
Page 498 1-1-4...
Page 499: Electrical Parts Layout
ELECTRICAL PARTS LAYOUT...
Page 500 1-1-4...
Page 501 2-1 Electrical Parts Layout 2-1-1 Electrical parts layout ................ 2-1-1...
Page 503 2-1-1 Electrical parts layout Figure 2-1-1 Electrical parts layout 1. Memory unit main PCB (MMPCB) ....Controls the other PCBs and electrical components. 2. Power source PCB (PSPCB) ....... Generates 24 V DC, ±12 V DC and 5 V 3. Primary PCB (PPCB) ........Attenuates noise on the power supply line.
Page 504 1-1-4...
Page 505 OPERATION OF PCB...
Page 506 1-1-4...
Page 507: Operation Of The Pcb
2-2 Operation of the PCB 2-2-1 Memory unit main PCB ..............2-2-1...
Page 509: Memory Unit Main Pcb
2-2-1 Memory unit main PCB IPU interface connector FIFO (UL64,65, Base 66,67) 4/binary conversion QM/FIFO control Differential interface System memory QM Coder (4ch) EPROM SRAM (128KB) (256KB) interrupt controller (UM01) UL27 UL28 UL29 UL30 UL04 UL05,06 General I/O port Address bus (27 bits) Data bus (16 bits) Bus control signal Input/output control signal...
Page 510 • FIFO (UL64,65,66 and 67) Functions as line memory to input data to and output data from the I/O PLD and the QM coder. • SRAM (UL05 and 06) 256 KB RAM for the program download and variable areas of the MPU. •...
Page 511: Set Up And Adjustment Section
SET UP AND ADJUSTMENT SECTION...
Page 512 1-1-4...
Page 513: Installation
INSTALLATION...
Page 514 1-1-4...
Page 515 3-1 Installation 3-1-1 Unpacking and installation ..............3-1-1 ( 1 ) Installation environment ............3-1-1 ( 2 ) Installation procedure ..............3-1-2 3-1-2 Copy mode initial settings ..............3-1-9 3-1-3 Installing the hard disk drive (option) ..........3-1-10 3-1-4 Installing/removing additional memory (option) ......3-1-12...
Page 517: Unpacking And Installation
3-1-1 Unpacking and installation ( 1 ) Installation environment 1. Temperature and humidity: 10°C/50°F to 35°C/95°F, 15 to 85% RH 2. Power source: 120 V AC, 0.45 A/220-240 V AC, 0.3 A 3. Power source frequency stability: 50 Hz ± 0.3%, 60 Hz ± 0.3% 4.
Page 518: 2 ) Installation Procedure
191-1 ( 2 ) Installation procedure Unpack the memory unit. !@#$ %^&¤ ⁄ Figure 3-1-2 Unpacking 1 Pad @ Original guide retainer 2 Spacer # Pin $ Bronze binding screw BVM4 × 6 3 Outer case % Bronze binding screw BVM4 × 8 4 Memory unit ^ Bronze cross round head screw 6-32 ×...
Page 519 Install the memory unit. 1. Remove the four screws and the copier rear cover. 2. Remove the seven screws and the main PCB cover. Screws Main PCB cover Figure 3-1-3 3. Plug the 60-pin connector (the one with the longer shrink tube) of the cable into CN19 on the copier main PCB.
Page 520 5. Attach the clamp to the grounding sheath on the cable and fasten it with the M4 × 8 screw provided. 6. Refit the copier main PCB cover with the seven screws. Clamp M4 × 8 screw Figure 3-1-5 7. Fasten the two memory unit retainers to the copier main PCB cover with the eight M4 ×...
Page 521 8. Remove the two screws and the central opening blanking plate on the copier rear cover. 9. Pull out the cable through the central opening in the copier rear cover and fasten the rear cover to the copier with the four screws. Rear cover Screws Central opening...
Page 522 11. Remove the four screws and the cover of the memory unit. Screws Cover Screws Memory unit Figure 3-1-9 12. Pull out the cable through the upper opening in the memory unit and attach the memory unit by hanging it on the screws and then tightening them. Memory unit Screw Screw...
Page 523 13. Attach the clamp to the grounding sheath on the cable and fasten it with the M4 × 8 screws provided. 14. Plug the 60-pin connector of the cable into CN2 on the memory unit main PCB. Memory unit main PCB 60-pin connectors M4 ×...
Page 524 191-1 17. Fasten the original guide retainers with the two pins and insert the ends of the original guide into them. 18. Connect the power plug to the wall outlet. Original guide retainers Original guide Original guide retainers Figure 3-1-13 19.
Page 525: Copy Mode Initial Settings
3-1-2 Copy mode initial settings The factory settings for this unit are as shown below. • Contents of settings Sim. No. Contents Factory setting Settings Memory output mode 20 prints 3-1-9...
Page 526: Installing The Hard Disk Drive (Option)
191-1 3-1-3 Installing the hard disk drive (option) Procedure 1. Remove the four screws and the cover of the memory unit. 2. Detach the memory unit from the copier. 3. Fit the hard disk drive with the four inch screws provided with the memory unit. Memory unit Hard disk drive Inch screws...
Page 527 7. Enter simulation mode. 8. Run simulation 173 to format the hard disk drive. Caution: Do not turn the power off during formatting. Formatting requires about 32 minutes. 3-1-11...
Page 528: Installing/Removing Additional Memory (Option)
3-1-4 Installing/removing additional memory (option) Procedure • Before starting to install or remove additional memory, ensure the whole machine is turned off. • Install memory in the order of SIMM0, SIMM1 and SIMM2. : installed; : not installed Total memory size SIMM0 SIMM1 SIMM2...
Page 529 3. Raise the memory straight up so that the projections at the ends of the SIMM socket sit in the holes in the ends of the memory. Caution: Ensure the memory is firmly held by the SIMM socket. 4. Refit the cover of the memory unit with the four screws. Additional memory Figure 3-1-17 •...
Page 530 1-1-4...
Page 531: Simulation
SIMULATION...
Page 532 1-1-4...
Page 533 3-2 Simulation 3-2-1 Simulations ..................3-2-1 ( 1 ) Running a simulation ..............3-2-1 ( 2 ) Contents of simulations ............. 3-2-2 3-2-2 Adjustment simulations ..............3-2-5 ( 1 ) Adjusting base 4 output density ..........3-2-5 ( 2 ) Adjusting thresholds (central exposure level) ......3-2-6 ( 3 ) Adjusting base 4 thresholds simultaneously ......
Page 535: Simulations
191-1 3-2-1 Simulations ( 1 ) Running a simulation Start Turn the main switch on. Entering simulation mode. Enter 10871087 with the numeric keys. 000 is shown on the display. Enter a simulation No. to be run with Selecting a simulation No. the numeric keys.
Page 536: 2 ) Contents Of Simulations
191-1 ( 2 ) Contents of simulations SIM No. Description Purpose Adjusting base 4 output density See page 3-2-5. Adjusting thresholds (central exposure level) See page 3-2-6. Adjusting base 4 thresholds simultaneously See page 3-2-7. Adjusting Exp. 1.0 threshold See page 3-2-8. Adjusting Exp.
Page 537 SIM No. Description Purpose Formatting the HDD Formats the HDD. 1. Enter 173 with the numeric keys. 2. Press the enter key. Formatting starts, showing “HDD FORMAT ∗ ” on the display. The display shows “HDD FORMAT FINISHED” when formatting is completed. It takes about 32 minutes.
Page 538 191-1 SIM No. Description Purpose Memory unit problem history To be run to check the history 1. Enter 176 with the numeric keys. of problems that 2. Press the enter key. The display shows any have occurred in problems. the memory unit. 1: FIFO overflow 2: FIFO underflow 4: DMAC interrupt error...
Page 539: Adjustment Simulations
3-2-2 Adjustment simulations ( 1 ) Adjusting base 4 output density Adjust the half-tone densities (levels 2 and 3) on base 4 outputs as follows. Level 1 is fixed to white (tone 0) and level 4 to black (tone 31). Procedure Start Enter simulation mode.
Page 540: ( 2 ) Adjusting Thresholds (Central Exposure Level)
( 2 ) Adjusting thresholds (central exposure level) Adjust the read-in density (threshold) at Exp. 4. Procedure Start Enter simulation mode. Enter 161 with the numeric keys. Press the enter key. Select the mode to be adjusted with the leading edge margin or left margin keys.
Page 541: 3 ) Adjusting Base 4 Thresholds Simultaneously
191-1 ( 3 ) Adjusting base 4 thresholds simultaneously Perform the following adjustment to shift the densities (thresholds) on base 4 out- put simultaneously. Since the number set in simulation 162 returns to zero after setting, be sure that the four values have been changed accordingly by running simulation 161. Procedure Start Enter simulation mode.
Page 542: 4 ) Adjusting Exp. 1.0 Threshold
191-1 ( 4 ) Adjusting Exp. 1.0 threshold Perform the following steps for making the densities (threshold) for Exp. 1.0 higher. Procedure Start Enter simulation mode. Enter 163 with the numeric keys. Press the enter key. Select the mode to be adjusted with the leading edge margin or left margin keys.
Page 543: 5 ) Adjusting Exp. 7.0 Threshold
191-1 ( 5 ) Adjusting Exp. 7.0 threshold Perform the following steps for making the densities (threshold) for Exp. 7.0 lower. Procedure Start Enter simulation mode. Enter 164 with the numeric keys. Press the enter key. Select the mode to be adjusted with the leading edge margin or left margin keys.
Page 544: Dip Switch Settings
3-2-3 Dip switch settings ( 1 ) Contents of the dip switch settings Turn the power off before changing the dip switch settings. Dip switch setting Operation Operates as a normal memory board. Switches 3 and 4 must be always off. 1~4: OFF Performs a memory (DRAM module) check only.
Page 545: Pcb Initial Setting
PCB INITIAL SETTING...
Page 546 1-1-4...
Page 547 3-3 PCB Initial Setting 3-3-1 Main PCB ..................3-3-1...
Page 549: Main Pcb
191-1 3-3-1 Main PCB When replacing the backup PCB on the copier with the memory unit attached, take the following procedure. Procedure • With the existing backup PCB 1. Record the following data of user-set items. • Settings used in program copy mode •...
Page 550 191-1 • With the new backup PCB 7. Connect the power plug and turn the copier main switch on. 8. Enter simulation mode. 9. Run simulations 70 and 85. 10. Clean the contact glass and the middle upper original roller. 11.
Page 551: Self-Diagnostics
SELF DIAGNOSTICS...
Page 552 1-1-4...
Page 553 191-1 3-4 Self-diagnostics 3-4-1 Self-diagnostic function ..............3-4-1 ( 1 ) Self-diagnostic display ............... 3-4-1 ( 2 ) Error message ................3-4-3 ( 3 ) Conditions that turn the memory unit main PCB LEDs on ..3-4-4...
Page 555: Self-Diagnostic Function
3-4-1 Self-diagnostic function (1) Self-diagnostic display When the copier detects a problem with itself, it disables copying and displays a self-di- agnostic code (C-xxx) indicating the nature of the problem together with a message re- questing to call for service on the display. After removing the problem, the self-diagnostic function can be reset by opening and closing the copier main unit or by turning the main switch off and back on.
Page 556 (Self diagnostic codes) Remarks Code Contents Causes Check procedures/corrective measures C-32 Communication Poor contact in Check the connection of CN2 on the problem with connector CN2 memory unit main PCB and repair if the memory unit on the memory necessary. Check for continuity unit main PCB.
Page 557: 2 ) Error Message
191-1 (2) Error message When an error in independent operation of the memory unit is detected, an error message is shown on the message display, and memory copying is disabled. When a key is pressed after an error is detected, normal copying only is enabled. When the power to the memory unit is turned off and on, the memory unit error detection is reset.
Page 558: 3 ) Conditions That Turn The Memory Unit Main Pcb Leds On
191-1 (3) Conditions that turn the memory unit main PCB LEDs on LED02 to LED06 do not light during normal memory copy operation (attached to the copier). Errors are identified by the copier through serial communication. Name Color Description LED01 (SCSI TERMOFF) Lights when the circuit protector is triggered.
Page 559 TROUBLESHOOTING...
Page 560 1-1-4...
Page 561: Troubleshooting
3-5 Troubleshooting 3-5-1 PCB terminal voltages ..............3-5-1 ( 1 ) Power source PCB ..............3-5-1 ( 2 ) Memory unit main PCB .............. 3-5-2...
Page 563: Pcb Terminal Voltages
3-5-1 PCB terminal voltages Precautions • When handling the circuit boards, do not touch the components with bare hands. • ICs can be damaged by static discharges. If a PCB contains ICs, do not touch the ICs, cable connectors or edge connectors. •...
Page 564 ( 2 ) Memory unit main PCB NF112 UL50 SW02 NF117 Z9538PCC NF115 NF116 RA27 – PLD1 MACH231 75 UP01A JP04 NF106 JP03 RA04 NF06 MC88340PV CP CP NF82 UM01 NF87 NF102 NF103 NF05 NF104 NF109 NF110 NF83 NF111 NF17 NF19 NF84 NF106...
Page 565 Terminals (CN) Voltage Remarks 5 V DC 5 V DC supply from PSPCB, input 5 V DC 5 V DC supply from PSPCB, input 2-1A 2-19A 5/0 V DC (Pulse) Input image data 2-2A 2-19A 5/0 V DC (Pulse) Input image data 2-3A 2-19A 5/0 V DC (Pulse)
Page 566 1-1-4...
Page 567: Appendixes
APPENDIXES...
Page 568 1-1-4...
Page 569 3-6 Appendixes Timing chart No. 1 ..................3-6-1 Timing chart No. 2 ..................3-6-2 Power source PCB ..................3-6-3 Wiring diagram....................3-6-4...
Page 570 1-1-4...
Page 571 Timing chart No. 1 Memory copy mode, bypass paper feed, with original inserted before the paper CN3-16 OLDSW CN3-12 OTDSW CN3-13 CN3-15 PCSW CN3-11 100 ms 100 ms CN4-4B DB CHG(+) 300 ms 200 ms 100 ms 300 ms DB REM CN4-3B CN7-6 200 ms...
Page 572 Timing chart No. 2 Memory copy mode, roll paper feed, single copy CN3-16 OLDSW CN3-12 OTDSW CN3-13 BYPRSW CN3-14 BYPTIMSW CN3-34 PCSW CN3-15 750 ms 100 ms 100 ms DB CHG(+) CN4-4B 300 ms 100 ms 300 ms 200 ms DB REM CN4-3B CN7-6...
Page 573: Power Source Pcb
Power source PCB C51 R51 CR52 IC51 CR51 CR53 CP51 CP52 CP53 –12V +12V R54 R55 CR54 12,13 C58 C59 CR55 14,15 OUTPUT CP54 CR56 IC52 POWER OK VADJ 3-6-3...
Page 574: Wiring Diagram
Wiring diagram PSPCB PPCB S.GND – +12 V (CP51) (P05) S.GND (CP1) –12 V SIMM0 AC(L) S.GND AC(N) AC(N) – (OPTION) – AC(L) AC(L) – S.GND AC(N) +12 V (CP52) –12 V TERMINAL TERMINAL S.GND MMPCB +12 V (CP53) –12 V (CONNECT S.GND ONLY 100V)
Page 575 TECHNICAL SERVICE BULLETINS...
Page 576 ####7%:-2#h#2f% SUBJECT: PARTS CATALOG UPDATES GENERAL: The following Parts Updates are being issued for all A741 Parts Catalogs. • UPDATE 1: NOTES PAGE – A “V” prefix was not added to the beginning of each part number. Please add note six to your Parts Catalog as shown below.
Page 577 TECHNICAL SERVICE BULLETIN BULLETIN NUMBER: A741 - 002 12/21/99 APPLICABLE MODEL: GESTETNER - NA RICOH – FW7030D SAVIN - NA SUBJECT: SERVICE MANUAL - INSERT GENERAL: The Service Manual page listed below must be replaced with the page supplied. Each bulletin package contains 1 set of replacement pages.
Page 578 8. Reattach the main switch assembly to the main unit. 9. Refit the right front cover on the main unit. 10. Close the right cover. 11. Plug the power cord to a wall outlet then turn the main switch on. 12.
Page 579 TECHNICAL SERVICE BULLETIN BULLETIN NUMBER: A741 - 003 02/18/2000 APPLICABLE MODEL: GESTETNER - NA RICOH – FW7030D SAVIN - NA SUBJECT: SERVICE MANUAL - INSERT GENERAL: The Service Manual pages listed below must be replaced with the pages supplied. Each bulletin package contains 1 set of replacement pages.
Page 580 Rev. 02/2000 3-3-6 Transfer/separation section 3-3-37 3-3-7 Cleaning section 3-3-42 3-3-8 Fixing section 3-3-48 3-3-9 Other sections 3-3-60 3-4 PCB Initial Settings 3-4-1 Main PCB 3-4-1 3-4-2 Non-field-adjustable volume controls 3-4-3 3-5 Self Diagnostics 3-5-1 Self-diagnostic function 3-5-1 3-6 Troubleshooting 3-6-1 Image formation problems 3-6-1 3-6-2 Paper misfeeds...
Page 581 PREVENTIVE MAINTENANCE CHECK LIST A741 NOTICE: This PREVENTIVE MAINTENANCE CHECK LIST applies only to those machines that have been maintained and placed in operating environments that meet Ricoh specifications. 4-1-1...
Page 582 PREVENTIVE MAINTENANCE SCHEDULE CK = CHECK MODEL: A741 REGULAR PERIODIC MAINTENANCE MAINTENANCE CL = CLEAN Page 1 of 9 LU = LUBRICATION ADJ = ADJUST RE = REPLACE INST = INSTALL CHECKPOINT PART NO. REMARKS * INSTALLATION * 1 count = 1 foot of Copy Paper Feed Install at initial set-up.
Page 583 PREVENTIVE MAINTENANCE SCHEDULE CK = CHECK MODEL: A741 REGULAR PERIODIC MAINTENANCE MAINTENANCE CL = CLEAN Page 2 of 9 LU = LUBRICATION ADJ = ADJUST RE = REPLACE INST = INSTALL CHECKPOINT PART NO. REMARKS Lower Original Feed V67813211 Use Alcohol...
Page 584 PREVENTIVE MAINTENANCE SCHEDULE CK = CHECK MODEL: A741 REGULAR PERIODIC MAINTENANCE MAINTENANCE CL = CLEAN Page 3 of 9 LU = LUBRICATION ADJ = ADJUST RE = REPLACE INST = INSTALL CHECKPOINT PART NO. REMARKS Pre-Transfer Roller 3-10 V67816010 Use Alcohol...
Page 585 PREVENTIVE MAINTENANCE SCHEDULE CK = CHECK MODEL: A741 REGULAR PERIODIC MAINTENANCE MAINTENANCE CL = CLEAN Page 4 of 9 LU = LUBRICATION ADJ = ADJUST RE = REPLACE INST = INSTALL CHECKPOINT PART NO. REMARKS Main Charger Use Dry Clean Cloth. Replace with...
Page 586 PREVENTIVE MAINTENANCE SCHEDULE CK = CHECK MODEL: A741 REGULAR PERIODIC MAINTENANCE MAINTENANCE CL = CLEAN Page 5 of 9 LU = LUBRICATION ADJ = ADJUST RE = REPLACE INST = INSTALL CHECKPOINT PART NO. REMARKS Dev. Unit Ass’y V34093020 Clean with Vacuum Cleaner...
Page 587 PREVENTIVE MAINTENANCE SCHEDULE CK = CHECK MODEL: A741 REGULAR PERIODIC MAINTENANCE MAINTENANCE CL = CLEAN Page 6 of 9 LU = LUBRICATION ADJ = ADJUST RE = REPLACE INST = INSTALL CHECKPOINT PART NO. REMARKS Lower Cleaning V67818050 If toner drop noticed, replace.
Page 588 PREVENTIVE MAINTENANCE SCHEDULE CK = CHECK MODEL: A741 REGULAR PERIODIC MAINTENANCE MAINTENANCE CL = CLEAN Page 7 of 9 LU = LUBRICATION ADJ = ADJUST RE = REPLACE INST = INSTALL CHECKPOINT PART NO. REMARKS Fixing Press Roller V67820270 Use Alcohol...
Page 589 PREVENTIVE MAINTENANCE SCHEDULE CK = CHECK MODEL: A741 REGULAR PERIODIC MAINTENANCE MAINTENANCE CL = CLEAN Page 8 of 9 LU = LUBRICATION ADJ = ADJUST RE = REPLACE INST = INSTALL CHECKPOINT PART NO. REMARKS Upper roller, Roll V67807510 Use Alcohol...
Page 590 PREVENTIVE MAINTENANCE SCHEDULE CK = CHECK MODEL: A741 REGULAR PERIODIC MAINTENANCE MAINTENANCE CL = CLEAN Page 9 of 9 LU = LUBRICATION ADJ = ADJUST RE = REPLACE INST = INSTALL CHECKPOINT PART NO. REMARKS 10-0 * COPY QUALITY *...
Page 591 TECHNICAL SERVICE BULLETIN TECHNICAL SERVICE BULLETIN TECHNICAL SERVICE BULLETIN TECHNICAL SERVICE BULLETIN BULLETIN NUMBER: A741 - 004 BULLETIN NUMBER: A741 - 004 04/20/2000 04/20/2000 BULLETIN NUMBER: A741 - 004 BULLETIN NUMBER: A741 - 004 04/20/2000 04/20/2000 APPLICABLE MODEL APPLICABLE MODEL: : : :...
Page 592 CONTENTS THEORY AND CONSTRUCTION SECTION 1-1 Specifications 1-1-1 Specifications ................1-1-1 1-2 Handling Precautions 1-2-1 Handling and storage of the drum ..........1-2-1 1-2-2 Storage of developer and toner ............. 1-2-1 1-2-3 Handling of the heaters ..............1-2-1 1-2-4 Storage of paper ................1-2-1 1-3 Mechanical Construction 1-3-1 Part names and functions .............
Page 593 Rev. 04/2000 CONTENTS 3-1 Installation 3-1-1 Unpacking and installing the copier ……………………………. 3-1-1 (1) Installation environment …………………………………... 3-1-1 (2) Installation procedure ……………………………………… 3-1-2 3-1-2 Copy mode initial settings …………………………………….. 3-1-27 3-1-3 Installing the key counter (optional) ………………………….. 3-1-28 3-1-4 Installing the roll unit (optional) ……………………………….. 3-1-31...
Page 594 3-1-4 Installing the Roll Unit (optional) Procedure Be sure to turn the copier main switch off and unplug the power cord from the outlet before attaching the optional wall unit. Caution: Before starting the following procedure, ensure that the unit support assembly is present on the copier main body since the assembly cannot be attached to the copier after the roll unit is installed.
Page 595 Open the right side upper cover and remove the toner disposal tank. Remove the four screws and the right side lower cover [7A]. 10. Close the right side upper cover. 11. Remove the four screws and the rear lower cover [7B]. 12.
Page 596 14. Remove one screw and remove the lower lid [10]. 15. Fit the roll conveying support plate [P] to the copier rear frame with the three chromate binding screws [K] (M4x6) using the screw holes [11] in the frame. 16. Fit the bearing [Q] to roll conveying roller [D] with the stop ring [L].
Page 597 19. Fit the bearing [Q] to the shaft of the roll conveying rear roller [D] with the stop ring (E-7)[D] from outside of the roll conveying support plate [P]. 20. Fit the roll drive assembly [C] to the position where the roll drive lid [9] was until its removal in step 13, using the three screws which were holding the lid.
Page 598 23. Loop the drive belt [G] over the pulley [18] and the pulley [19] on the roll drive assembly. 24. Press the drive tension assembly [16] in the direction of the arrow in the diagram until its edge [20] covers half the hole [21] in the roll drive assembly, and retighten the assembly’s screw [17] loosened in step 22.
Page 599 29. Fit smaller pieces [27] of the roll sliders to the inside of the right and left frames using three binding screws (M4x6)[K]. NOTE: Orient the smaller pieces [27] with the portions [29] toward the front of the machine. 30. Slide one large piece [28] of the slider onto the smaller piece [27] installed inside the left frame.
Page 600 33. Place the roll unit [A] on the roll slider [F]. NOTE: 1. When carrying the roll unit, be sure to hold the bottoms of the left and right frames. 2. After installing the roll unit, remove the pads from it. 34.
Page 601 38. Loosen the three screws and remove connector [33], then slide the power source PCB assembly [34] in the direction of the arrow. 39. Install the empty switch [I] and two size detection switches [T] with two bronze binding screws [J] and [U] (M3x12) respectively.
Page 602 Operation Check Insert the copier power plug into the wall outlet and turn the main switch on. Access SP mode and change the setting of SP89 from 1 to 2 to select the Roll Unit. Load paper in the roll unit using the roll shaft and make test copies to check the operation.
Page 603 Roll Slider G. Drive Belt H. Bearing Empty Switch Bronze Binding Screw M3x12 2 Bronze Binding Screw M4x6 Stop Ring (E-7) M. Cable Tie N. Roll Shaft 3-1-40...
Page 604 O. Roll Heater Label (120V only) 1 Roll Conveying Support Plate 1 Q. Bearing R. Roll Conveying Rear Guide Cable Tie Size Detection Switch U. Bronze Binding Screw M3x12 4 Wire 3-1-41...
Page 605 ⇒ The revised areas have been highlighted by an arrow • Updated Information (Table of Contents) • 3-1-23 Updated Information (Installation) • 3-1-42 Updated Information (Drum Conditioning)     CONTROL NO. 008WID 2000 RICOH Corporation. All rights reserved.
Page 606 Rev. 01/2001 CONTENTS THEORY AND CONSTRUCTION SECTION 1-1 Specifications 1-1-1 Specifications ................1-1-1 1-2 Handling Precautions 1-2-1 Handling and storage of the drum ..........1-2-1 1-2-2 Storage of developer and toner ............1-2-1 1-2-3 Handling of the heaters ..............1-2-1 1-2-4 Storage of paper ................
Page 607 Rev. 01/2001 Set the developer (simulation 60). Input 060 with the numeric keys. Press the enter key. • The unit starts operating. When 3 minutes have elapsed since the start of operation, the toner control voltage is automatically set and the value is shown on the display.
Page 608 Rev. 01/2001 ⇒ 3-1-5 Drum Conditioning Start Enter simulation mode. Input "103" with the numeric keys. The image is visible from around the 6 tone for Test Pattern 1, from around the 3 tone for Test Pattern 2 and from around the 9 tone for Test Pattern 3.