Ricoh FT8680 Service Manual

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IMPORTANT SAFETY NOTICES

PREVENTION OF PHYSICAL INJURY

1. While the machine warms up, it will suddenly start turning to perform the

process control data initialization. Keep hands away from any mechanical

and electrical components during this period.

2. Before disassembling or assembling parts of the copier and peripherals,

make sure that the copier and the second sorter power cord is unplugged.

3. The wall outlet should be near the copier and easily accessible.

4. Note that some components of the copier, the paper tray unit, and the

2nd sorter are supplied with electrical voltage even if the main switch is

turned off.

5. If any adjustment or operation check has to be made with exterior covers

off or open while the main switch is turned on, keep hands away from

electrified or mechanically driven components.

6. The inside and the metal parts of the fusing unit become extremely hot

while the copier is operating. Be careful to avoid touching those

components with your bare hands.

HEALTH SAFETY CONDITIONS

1. Never operate the copier without the ozone filters installed.

2. Always replace the ozone filters with the specified ones at the specified

intervals.

3. Toner and developer are non-toxic, but if you get either of them in your

eyes by accident, it may cause temporary eye discomfort. Try to remove

with eye drops or flush with water as first aid. If unsuccessful, get medical

attention.

Table of Contents

Summary of Contents for Ricoh FT8680

Page 1 IMPORTANT SAFETY NOTICES PREVENTION OF PHYSICAL INJURY 1. While the machine warms up, it will suddenly start turning to perform the process control data initialization. Keep hands away from any mechanical and electrical components during this period. 2. Before disassembling or assembling parts of the copier and peripherals, make sure that the copier and the second sorter power cord is unplugged.
Page 2: Observance Of Electrical Safety Standards
OBSERVANCE OF ELECTRICAL SAFETY STANDARDS 1. The copier and its peripherals must be installed and maintained by a customer service representative who has completed the training course on those models. 2. The RAM board on the main control board has a lithium battery which can explode if replaced incorrectly.
Page 3: Overall Machine Information
SECTION 1 OVERALL MACHINE INFORMATION...
Page 4: Specifications
31 July 1995 SPECIFICATIONS 1. SPECIFICATIONS Main Copier Copier Configuration: Console Copy Process: Dry Electrostatic Transfer System Originals: Sheet/Book Original Size: Maximum: 11" x 17", A3 420 x 700 mm (in moving-original scan mode, Europe version only) Copy Paper Size: Maximum: 1st and 2nd tray 11"...
Page 5 SPECIFICATIONS 31 July 1995 Reproduction Ratios: See the following table: LT/DLT version A4/A3 version 200% 200% 155% 141% Enlargement 129% 122% 121% 115% Full Size 100% 100% Reduction Zoom: 50 ~ 200% Copy Exit Tray Capacity: 250 Sheets Toner Replenishment: Cartridge exchange (1500 g) Paper Feed: 1st tray (500 sheets)
Page 6 31 July 1995 SPECIFICATIONS Dimensions: LT/DLT version Width Depth Height Copier with document feeder and copy tray 1,375 mm 760 mm 1,445 mm 54.2" 30.0" 56.9" Copier with document feeder and one sorter 1,625 mm 873 mm 1,445 mm stapler 64.0"...
Page 7 SPECIFICATIONS 31 July 1995 Noise Emission: Sound pressure level (The measurements are made according to ISO 7779 at the operator position.) Copier only Full system* Stand-by less than 42 dB (A) less than 42 dB (A) less than 63 dB (A) less than 64 dB (A) Copying (average)
Page 8 31 July 1995 SPECIFICATIONS MEMO:...
Page 9: Copy Processes Around The Drum
COPY PROCESSES AROUND THE DRUM 31 July 1995 2. COPY PROCESSES AROUND THE DRUM A171V513.img...
Page 10 31 July 1995 COPY PROCESSES AROUND THE DRUM 1. DRUM CHARGE In the dark, the charge corona unit gives a uniform positive charge to the selenium drum. The charge remains on the surface of the drum because the photo conductive selenium has electrical resistance in the dark.
Page 11: Mechanical Component Layout
MECHANICAL COMPONENT LAYOUT 31 July 1995 3. MECHANICAL COMPONENT LAYOUT 3.1 COPIER 31 32 A171V500.wmf 1. First Mirror 18. Vertical Transport Unit-Left 2. Second Mirror 19. Registration Rollers 3. Third Mirror 20. Pre-transfer Corona Unit 4. Inverter Guide Plates 21. By-pass Feed Table 5.
Page 12 31 July 1995 MECHANICAL COMPONENT LAYOUT 3.2 ARDF A171V509.img 1. Original Tray Extension 10. 1st Pick-up Rollers 2. Upper Exit Rollers 11. 2nd Pick-up Rollers 3. Upper Inverter Gate 12. Separation Rollers 4. Lower Inverter Rollers 13. Lower Relay Roller 5.
Page 13: Electrical Component Descriptions
ELECTRICAL COMPONENT DESCRIPTIONS 31 July 1995 4. ELECTRICAL COMPONENT DESCRIPTIONS Refer to the electrical component layout on the reverse side of the Point to Point (Water proof paper) index numbers. 4.1 COPIER Name Function Index. No. Motors 1st Tray Drive Drives the bottom plate in the 1st tray.
Page 14 31 July 1995 ELECTRICAL COMPONENT DESCRIPTIONS Name Function Index. No. Drum Current Detection Measures the corona current. Main Controls overall machine operation. Motor Control Controls the dc motors. Operation Unit Controls the monitor display. Controls the pre-transfer lamp operation. Quenching Lamp Controls the quenching lamp operation.
Page 15 ELECTRICAL COMPONENT DESCRIPTIONS 31 July 1995 Name Function Index. No. Lower Limit - 3rd Tray Turns off the 3rd tray motor when the tray reaches the down position. Lower Limit - LCT Turns off the LCT motor when the tray reaches the down position.
Page 16 31 July 1995 ELECTRICAL COMPONENT DESCRIPTIONS Name Function Index. No. Paper Volume - 1st Tray Detects the amount of paper in the 1st tray. Paper Volume - 2nd Tray Detects the amount of paper in the 2nd tray. Paper Volume - 3rd Tray Detects the amount of paper in the 3rd tray. Paper Volume - LCT Detects the amount of paper in the LCT.
Page 17 ELECTRICAL COMPONENT DESCRIPTIONS 31 July 1995 Name Function Index. No. Anticondensation Turns on the tray heaters. Error Reset Resets error condition. LCT Cover Turns off components when the LCT top cover is open. Left Door 1 Turns off the main motor when the left door is open. Left Door 2 Turns off dc 24 volts lines when the left door is open.
Page 18 31 July 1995 ELECTRICAL COMPONENT DESCRIPTIONS 4.2 ARDF Symbol Name Function Index. No. Motors Feed-in Drives the pick-up rollers, separation rollers and relay rollers. Belt Drives the transport belt. Inverter Drives the inverter rollers and the exit rollers. Job Separation Drives the job separator.
Page 19 ELECTRICAL COMPONENT DESCRIPTIONS 31 July 1995 Original Width Detects the original width. Timing Supplies timing pulses to the DF main board. Moving Original Detects when the original is set on the moving Scan Entrance original scan entrance (European version only). Others CFF Guide Switch Detects whether the CFF guide is in the rear Oth1...
Page 20: Drive Layout
31 July 1995 DRIVE LAYOUT 5. DRIVE LAYOUT A171V510.img A171V508.img A171V511.img A171V506.img A171V512.img A : Development Unit B : Cleaning Unit C : Relay Transport Unit (to LCT & By-pass Table) D : Fusing Unit A171V507.img E : Vertical Transport Unit-Right 1.
Page 21: Paper Path
PAPER PATH 31 July 1995 6. PAPER PATH 6.1 SINGLE SIDED COPY – COPY FACE DOWN A171V501.wmf 6.2 DUPLEX MODE (1ST SIDE) A171V502.wmf 1-18...
Page 22 31 July 1995 PAPER PATH 6.3 DUPLEX MODE (2ND SIDE) A171V503.wmf 6.4 IMAGE OVERLAY MODE (1ST SIDE) A171V504.wmf 1-19...
Page 23 PAPER PATH 31 July 1995 6.5 IMAGE OVERLAY MODE (2ND SIDE) A171V505.wmf 1-20...
Page 24: Detailed Section Descriptions
SECTION 2 DETAILED SECTION DESCRIPTIONS...
Page 25: Process Control
31 July 1995 PROCESS CONTROL 1. PROCESS CONTROL 1.1 OVERVIEW The characteristics of each unit which is related to the copy image reproduction are changed by various factors. To get stable images over long periods and in continuous copy runs, these characteristic changes have to be compensated.
Page 26 PROCESS CONTROL 31 July 1995 Section Characteristics Causes of Change Compensation Method Drum Charge Potential Repeat Stress Measure the drum potential of a part Temperature that was not exposed (Dark Potential) Humidity with the potential sensor and adjust the charge corona output. Sensitivity Repeat Stress Measure the drum potential of a part...
Page 27: Image Control
31 July 1995 PROCESS CONTROL 1.2 IMAGE CONTROL 1.2.1 Latent Image Control Exposure Charge Black White Erase Potential Sensor Drum A171D507.wmf The figure shows the changes of the drum potential during the copy process. The drum potential just after charging the drum. Vd (Dark Potential): The drum potential just after exposing the black pattern (Vd pattern)
Page 28 PROCESS CONTROL 31 July 1995 Drum Potential Dark Original Density Light A171D519.wmf The above figure shows the relationship between the drum potential and the original density (exposing light intensity). To get constant copy quality, this relationship must be maintained. Since this relationship tends to change to the one represented by the dotted line by various factors, compensations are required as follows: A decrease in dark voltage (Vd) is compensated for by increasing the charge corona output.
Page 29 31 July 1995 PROCESS CONTROL 1.3 PROCESS CONTROL DATA INITIALIZATION The following flow chart shows all the steps that will be performed whenever the main switch is turned on while the hot roller temperature is below 100°C. This initializes all the process control settings. Main SW On (Fusing Temp.
Page 30 PROCESS CONTROL 31 July 1995 1.3.1 Drum Potential Sensor Calibration Case Sensor Output Amp. Drum A171D512.wmf A171D585.img Potential Sensor Drum Current Detection PCB Bias Relay P.P. TRIG 1 (800V) TRIG 2 (100V) Sensor Main PCB A171D511.wmf The drum potential sensor [A] is located just above the development unit. The sensor has a detector which detects the electric lines of force from the electric potential on the drum.
Page 31 31 July 1995 PROCESS CONTROL 1.3.2 Drum Conditioning When the fusing temperature reaches 160°C, the machine starts the drum conditioning process. In this mode, all the coronas and lamps around the drum are activated and drum sensitivity is stabilized, as in continuous copy runs.
Page 32 PROCESS CONTROL 31 July 1995 1.3.5 Charge Corona Current Adjustment Potential S. Id Set Drum Current Detect PCB MainPCB A11D502.wmf The charge corona current is measured and adjusted automatically by the drum current detect PCB. The charge corona current flows to the drum current detect PCB through the drum and the drum shaft.
Page 33 31 July 1995 PROCESS CONTROL 1.3.6 Vr Measurement Drum Potential Original Density Dark Light A171D510.wmf The drum residual voltage (Vr) tends to increase during the drums life due to electrical fatigue. The residual voltage cannot be reduced even if the exposure lamp voltage is increased.
Page 34 PROCESS CONTROL 31 July 1995 1.3.7 Vd Correction Drum Potential Exposure Glass Light Original Density Dark Vd Pattern A171D508.wmf A171D520.wmf The drum potential just after the black pattern (Vd Pattern) is exposed (Vd: Dark Potential) tends to lower during drum life due to a decrease in the drum’s capacity to carry a charge.
Page 35 31 July 1995 PROCESS CONTROL 1.3.8 VL Correction Pattern Drum Potential Dark Light Original Density A171D508.wmf A171D521.wmf Dirty optics and/or exposure lamp deterioration decreases the intensity of the light that reaches the drum. In addition to this, the drum sensitivity also changes during the drum’s life.
Page 36 PROCESS CONTROL 31 July 1995 1.3.9 V Measuring Drum Potential Light Dark Original Density A171D513.wmf Since the ID sensor pattern on the drum is made by the erase lamp and charge corona (except for B4/8 " x 14" copy mode due to the lens horizontal movement.
Page 37 31 July 1995 PROCESS CONTROL 1.3.10 ADS Adjustment Exposure Glass ADS Pattern ADS Pattern A171D508.wmf A171D570.img The ADS pattern is located underneath the exposure glass bracket. During the process control data initialization, the ADS reference voltage is adjusted. When the first scanner is moved to the return position for the Vd adjustment, the main PCB checks the ADS voltage through the ADS fiber optics cable.
Page 38 PROCESS CONTROL 31 July 1995 1.4 COMPENSATIONS DURING COPY CYCLE During continuous copying, the drum sensitivity changes due to the electrical fatigue. The drum sensitivity also changes during rest time. The following compensations are used for the drum sensitivity changes in the copy cycle: Pattern Drum...
Page 39 31 July 1995 PROCESS CONTROL 1.4.2 V Measuring Start key Charge Corona Exposure Lamp Scanner F Drum Potential Sensor A171D523.wmf During the process control data initialization, V is measured to determine the development bias for the ID sensor pattern in continuous copy runs. This bias cannot be used for the initial part of the copy run (less than 10 copies) due to the different drum potential after the charge corona is applied.
Page 40 DRUM 31 July 1995 2. DRUM 2.1 OVERVIEW A171D514.wmf A171D579.img This model uses an FO-type drum made by applying an urethane resin coating [A] on an F-type drum [B]. This coating provides a long life and minimize the white line problems on the half-tone areas. For the F-type drum, the charge carrying layer [C] is made by the drum conditioning.
Page 41: Drum Heater Control
31 July 1995 DRUM 2.2 DRUM HEATER CONTROL 160°C 65°C Drum Heater Drum Thermistor Drum Thermistor Converter Drum Drum Heater 1 Heater 1 Drum Drum Heater 2 Heater 2 Relay PCB Main PCB A171D509.wmf The drum thermistor monitors the drum surface temperature. When the measured temperature reaches 41°C, the main PCB determines that the copier is ready to make copies.
Page 42: Drum Charge
DRUM CHARGE 31 July 1995 3. DRUM CHARGE 3.1 CHARGE CORONA UNIT A171D505.wmf A171D580.img This copier uses a dual carbon coated tungsten wire corotron for the drum charge. The corona wire generates a corona of positive ions when the charge power pack [A] applies a high voltage.
Page 43: Corona Unit Ventilation
31 July 1995 DRUM CHARGE 3.2 CORONA UNIT VENTILATION A171D578.img If ozone produced by the corona charge stays in the charge corona area, it may cause uneven corona charging to the drum. To prevent this, ozone is vacuumed out by the vacuum fan through the duct and toner filter in the transport unit, then changed to oxygen by the ozone filter before blown out of the copier.
Page 44: Corona Wire Cleaner
DRUM CHARGE 31 July 1995 3.3 CORONA WIRE CLEANER A171D577.img Paper dust, or toner particles on the charge corona wires may interfere with charging and cause an uneven charge on the drum. The wire cleaner prevents this problem by automatically wiping the charge corona wires clean. Once every 5000 copies, the wire cleaner is activated when the main switch is turned on.
Page 45: Charge Corona Power Pack
31 July 1995 DRUM CHARGE 3.4 CHARGE CORONA POWER PACK 24 V Door DC Power Supply Drum Current DC Drive PCB Detect PCB TRIG Charge Main PCB Corona P.P. A171D506.wmf The main PCB sends a PWM (Pulse Width Modulation) signal to the charge corona power pack.
Page 46 ERASE 31 July 1995 4. ERASE 4.1 OVERVIEW A171D573.img The electrical charge of the area that does not require any image will be removed by the erase lamp unit [A]. This reduces toner consumption, and the load of the cleaning unit. The erase lamp unit consists of 90 yellow-green LEDs.
Page 47: Erase Lamp Circuit
31 July 1995 ERASE 4.2 ERASE LAMP CIRCUIT Main PCB Erase Lamp Unit DC Power Supply A171D504.wmf The main PCB sends the serial bit data to the erase lamp unit with the clock signal. The latch signal holds the ON/OFF condition of the LEDs. The following charts show the erase lamp control timing.
Page 48 OPTICS 31 July 1995 5. OPTICS 5.1 OVERVIEW A171D587.img The optics unit reflects an image of the original on the exposure glass onto the selenium drum. This forms a latent electrical image of the original. On this model, to minimize power consumption, a fluorescent lamp is used for the exposure lamp [A].
Page 49: Scanner Drive
31 July 1995 OPTICS 5.2 SCANNER DRIVE A171D576.img A dc servo motor is used as the scanner drive motor [A]. The scanner drive motor drives first [B] and second scanner [C] using four scanner drive wires. The second scanner speed is half of the first scanner speed.
Page 50 OPTICS 31 July 1995 5.3 SCANNER POSITION SENSORS A171D586.img There are two scanner position sensors located at the front side of the optics unit. The scanner home position sensor [A] is used to detect the home position at the machine initialization and during the scan cycle. The scanner return position sensor [B] is used to detect the scanner position for the process control data initialization (Vd and ADS data).
Page 51 31 July 1995 OPTICS 5.4 VERTICAL LENS DRIVE A171D581.img The lens vertical drive motor [A] changes the lens vertical position in accordance with the selected reproduction ratio. A stepper motor (Approx. 1.8° (0.05 mm)/step) is used to drive the lens through the lens drive belt.
Page 52 OPTICS 31 July 1995 5.5 HORIZONTAL LENS DRIVE A171D582.img The original horizontal position on the exposure glass varies in modes (such as platen, ADF, and CFF modes) for easy original handling. On the other hand, the center is the standard position of the paper feed. Therefore, the lens horizontal position has to be changed according to paper size, reproduction ratio, and the original modes.
Page 53 31 July 1995 OPTICS 5.6 HORIZONTAL LENS POSITIONING 5.6.1 For Original Position Lens Position Horizontal Copy Paper Original Front Edge Platen A171D516.wmf There are three standard original positions for the platen, ADF, and CFF modes. ADF mode original position is 5 mm to rear of the platen mode original position to maintain the original transport path (5 mm from the front scale).
Page 54 OPTICS 31 July 1995 5.6.3 For Reproduction Ratio Copy Paper Horizontal Lens Position Vertical Original Front Edge A151D515.wmf When the reproduction ratio is changed, the vertical position of the lens is changed. At the same time, the total focal length has to be changed to adjust the image focusing.
Page 55 31 July 1995 OPTICS 5.7 MIRROR UNIT DRIVE A171D567.img To compensate the focus change at the reproduction change, the mirror unit (4th and 5th mirrors) position is changed. A stepper motor (Approx. 7.5° (0.1 mm)/step) is used for the mirror unit drive. A mirror unit home position sensor [A] is used to detect the unit position for full size mode.
Page 56: Motor Drive Circuit
OPTICS 31 July 1995 5.8 MOTOR DRIVE CIRCUIT Sensors Encoders Serial Horizontal DC Motor Main Motor Interface Drive Drive PCB Control PCB Vertical Drive Mirror Unit Drive Scanner Drive Encoder A171D518.wmf The motor control PCB communicates with the main PCB through the serial interface lines.
Page 57: Exposure Lamp Unit
31 July 1995 OPTICS 5.9 EXPOSURE LAMP UNIT A171D568.img A171D584.img This copier uses a fluorescent lamp [A] (100 V 84 W). This has the following advantages: • Low power consumption • There is no bright point and it is easy to get even luminescence •...
Page 58: Exposure Lamp Control
OPTICS 31 July 1995 5.10 EXPOSURE LAMP CONTROL A171D572.img Exposure lamp intensity must be stabilized during the copy cycle to get a constant latent image on the drum. The main PCB [A] monitors and maintains the light intensity through a fiber optics cable [B]. According to the measured value, a lamp power signal (PWM signal) is sent to the fluorescent lamp stabilizer [C].
Page 59 31 July 1995 OPTICS 5.11 AUTO IMAGE DENSITY CONTROL 26 mm 50 mm A171D571.img 26 mm 50 mm 166 mm A171D501.wmf The original background density is read through a fiber optics cable on the exposure lamp unit. The sampled strip is at the leading edge of the original and the size depends on the scanner speed (reproduction ratio).
Page 60 OPTICS 31 July 1995 5.12 UNEVEN LIGHT INTENSITY CORRECTION A171D575.img A171D583.img The slit plate [A] corrects the uneven light intensity at the ends and center of the fluorescent lamp [B] and evenly distributes light reflected from the original. To compensate for reduced light at the lens edges, the shading plate [C] is located in front of the lens.
Page 61: Anti-Condensation Heater
31 July 1995 OPTICS 5.13 ANTI-CONDENSATION HEATER A171D566.img To prevent condensation in the optics unit, a 40 W anti-condensation heater [A] is installed at the bottom of the lens unit. The anti-condensation heater is controlled by a thermoswitch [B] (On at 17°C, Off at 25°C) under the following conditions: 1.
Page 62 DEVELOPMENT 31 July 1995 6. DEVELOPMENT 6.1 OVERVIEW A171D594.img This copier uses a double roller (diameter 20 mm each) development system. This system differs from single roller development system in that (1) it develops the image in a narrow area and (2) it develops the image twice. Also, fine toner and developer (smaller particle size) are used.
Page 63: Drive Mechanism
31 July 1995 DEVELOPMENT 6.2 DRIVE MECHANISM A171D606.img All the development unit parts, except the toner supply brush, are driven by the development drive motor (dc motor). The toner supply brush is driven by the toner supply motor. The development motor drives the development drive gear through two timing belts.
Page 64: Cross Mixing
DEVELOPMENT 31 July 1995 6.3 CROSS MIXING A171D600.img This copier uses a standard cross-mixing mechanism to keep the toner and developer evenly mixed. It also helps agitate the developer to prevent developer clumps from forming, and helps create the triboelectric charge. The developer on the turning upper development roller is split into two parts by the doctor blade.
Page 65: Development Bias
31 July 1995 DEVELOPMENT 6.4 DEVELOPMENT BIAS 6.4.1 Bias Power Pack Potential Sensor Drum Current Detection PCB Bias Relay P.P. TRIG 1 (800V) TRIG 2 (100V) Main PCB Sensor A171D529.wmf A171D525.wmf PWM Duty Cycle = t2/t1 x 100 (%) Output = 10 x PWM Duty Cycle (V) TRIG1 TRIG2 OUTPUT (V)
Page 66 DEVELOPMENT 31 July 1995 6.4.2 Bias Control In Copy Cycle The bias output is determined by four factors. The total bias is described as; (ADS Mode) BADJ (Manual ID Mode) 1) Base Bias (V Drum Potential Dark Original Density Light A171D528.wmf As explained in the process control section, the base bias for development is determined by the drum light potential (V...
Page 67 31 July 1995 DEVELOPMENT 2) ADS Compensation (V Dark ADS voltage (V) Light A171D524.wmf According to the original background density, the bias is compensated. The compensation value is determined with the voltage measured by the ADS sensor (ADS Voltage) as follows: = –...
Page 68 DEVELOPMENT 31 July 1995 4) Manual ID Selection Position Compensation (V ID Selection –60 –120 –180 A171D532.wmf According to the manual ID selection position, the bias is compensated as follows: = 60 x M – 240 (When M = 1 to 6) 60 x M –...
Page 69 31 July 1995 DEVELOPMENT 6.4.3 Bias for the ID Sensor Pattern Lens Position A3/11" x 17" Pattern B4/8 " x 14" ID Sensor A4/8 " x 11" Pattern Outside Exposure Glass A171D530.wmf The lens horizontal position is different in the used paper size on this mode. On the other hand, the ID sensor position is fixed at one position.
Page 70: Toner Supply Mechanism
TONER DENSITY DETECTION AND SUPPLY 31 July 1995 7. TONER DENSITY DETECTION AND SUPPLY 7.1 TONER SUPPLY MECHANISM A171D593.img The main PCB monitors the ID sensor pattern density on the drum through the ID sensor once every ten copies and turns on the toner supply motor when the pattern density is low (if Vsp/Vsg ≥...
Page 71: Toner Density Detection
31 July 1995 TONER DENSITY DETECTION AND SUPPLY 7.2 TONER DENSITY DETECTION 7.2.1 ID Sensor Pattern Production ID Sensor Pattern Main SW Start Key Start Key Start Key Counter A Counter B A171D531.wmf Drum sensitivity varies from copy to copy. Especially, drum rest time affects drum sensitivity.
Page 72 TONER DENSITY DETECTION AND SUPPLY 31 July 1995 7.2.2 Toner Density Detection A171D533.wmf Low image density High image density Bare Sensor drum pattern A171D534.wmf The ID sensor measures the density of the ID sensor pattern developed on the drum. The main PCB receives two values of the sensor output, the value for the sensor pattern (Vsp) and the value for the bare drum (Vsg).
Page 73: Toner Supply Amount
31 July 1995 TONER DENSITY DETECTION AND SUPPLY 7.2.3 ID Sensor Abnormal Conditions a. Vsp Abnormal If the measured Vsp is 1.4 V (when Vsg = 4 V) or more and this condition is detected five times in a row, a system error condition will be indicated on the CRT and the 7% fixed toner supply control will be used for the rest of the copy run.
Page 74: Toner Cartridge
TONER DENSITY DETECTION AND SUPPLY 31 July 1995 7.4 TONER CARTRIDGE A171D607.img A171D588.img When the toner cartridge is set, the toner cartridge sensor [A] is de-actuated. The main PCB monitors the toner cartridge sensor signal and detects if the cartridge is replaced at the toner end condition. The main PCB inhibits copying if there is no toner cartridge.
Page 75: Toner End Detection
31 July 1995 TONER DENSITY DETECTION AND SUPPLY 7.5 TONER END DETECTION 7.5.1 Toner Near End Detection A171D601.img Toner near end is detected by measuring physical amount of toner remaining in the toner tank by the following mechanism. The toner near end feeler [A] has a magnet [B] and is installed on the toner mixing vane drive shaft [C].
Page 76 TONER DENSITY DETECTION AND SUPPLY 31 July 1995 7.5.2 Toner End Detection When little toner remains in the toner tank, the amount of toner supplied to the development unit decreases, and the image of the ID sensor pattern gets lighter. When the Main PCB detects the low ID sensor pattern density condition (Vsp/Vsg ≥...
Page 77: Image Transfer And Paper Separation
31 July 1995 IMAGE TRANSFER AND PAPER SEPARATION 8. IMAGE TRANSFER AND PAPER SEPARATION 8.1 PRE-TRANSFER DISCHARGE A171D605.img The pre-transfer corona (PTC) [A] and pre-transfer lamp (PTL) [B] are used to prevent incomplete toner transfer and pick-off pawl marks on the copy. To prevent incomplete toner transfer, the PTC reduces drum potential by applying an ac corona.
Page 78 IMAGE TRANSFER AND PAPER SEPARATION 31 July 1995 8.2 IMAGE TRANSFER A171D595.img The copy paper is fed from the registration section to the transfer and separation section through the guide mylar [A] which holds the copy paper so that the paper sticks to the drum surface. The transfer corona [B] applies a positive charge from the back side of the copy paper to attract the negatively charged toner image from the drum to the copy paper.
Page 79 31 July 1995 IMAGE TRANSFER AND PAPER SEPARATION 8.3 PAPER SEPARATION A171D602.img To break the attraction between the paper and the drum, the separation corona applies an ac corona to the back side of the paper. The stiffness of the paper then causes it to separate from the drum. The pick-off pawls [A] which are installed on the cleaning unit assist paper separation.
Page 80: Tc/Sc Wire Cleaner
IMAGE TRANSFER AND PAPER SEPARATION 31 July 1995 8.4 TC/SC WIRE CLEANER A171D609.img The transfer and separation corona unit has the wire cleaners to remove paper dust and/or toner particles which may get on the corona wires. Once every 5000 copies, the wire cleaners are activated when the main switch is on.
Page 81: Pick-Off Pawls
31 July 1995 IMAGE TRANSFER AND PAPER SEPARATION 8.5 PICK-OFF PAWLS A171D603.img A171D589.img The pick-off pawls assist the paper separation process. The pick-off pawls are kept normally in contact with the drum. When the transport unit is lowered, the pick off pawls are released from the drum.
Page 82: Transport Unit
IMAGE TRANSFER AND PAPER SEPARATION 31 July 1995 8.6 TRANSPORT UNIT A171D608.img Four transport belts are used to transport the copied paper to the fusing section. The vacuum fan sucks the air through the holes on the transport unit to hold the paper on the transport belts. The transport unit is pushed up and locked into position by the front and rear guide rollers.
Page 83 31 July 1995 CLEANING 9. CLEANING 9.1 OVERVIEW A171D590.img This copier uses the counter blade system for drum cleaning. The blade is angled against drum rotation. This counter blade system has the following advantages: • Less wearing of the cleaning blade edge. •...
Page 84: Drive Mechanism
CLEANING 31 July 1995 9.2 DRIVE MECHANISM A171D599.img The drive force from the main motor is transmitted to the cleaning unit drive gear via the timing belt [A] and the cleaning unit coupling [B]. The cleaning unit drive gear then transmits the force to the front side through the cleaning brush [C] and flick roller [D].
Page 85: Cleaning Blade Pressure Mechanism
31 July 1995 CLEANING 9.3 CLEANING BLADE PRESSURE MECHANISM A171D592.img When the cleaning solenoid [A] is energized, the solenoid arm lowers the pressure arm [B]. This frees the pressure release lever [C] and the blade spring [D] applies pressure to the cleaning blade. To ensure cleaning blade operation, +38 V is applied to the solenoid for 0.3 seconds as initial activation, then +24 V is applied.
Page 86 CLEANING 31 July 1995 9.4 CLEANING BLADE SIDE-TO-SIDE MOVEMENT A171D596.img The cleaning blade is held on the cleaning blade holder with a shoulder screw [A] at its center so that the cleaning pressure is evenly applied to the drum surface. The cleaning blade holder touches the cam gear [B] which gives a side-to-side movement to the blade.
Page 87: Toner Collection Mechanism
31 July 1995 CLEANING 9.5 TONER COLLECTION MECHANISM A171D597.img Toner collected by the cleaning unit is transported to the toner cartridge through the toner collection tubes. Three helical coils are used for the toner transport. A magnetic disk torque limiter [A] is used on the toner collection coil drive mechanism to prevent the coil from being damaged by toner clogged in the collection tube.
Page 88 CLEANING 31 July 1995 9.6 TONER SCATTERING PREVENTION A171D591.img The cleaning unit has two air outlets covered by the cleaning filter on its back side. The vacuum fan draws the air from the cleaning unit through the cleaning filters [A] and the toner filter [B] located above the transport section. This prevents the toner in the cleaning unit from being scattered to the drum area.
Page 89: Cleaning Solenoid Circuit
31 July 1995 CLEANING 9.7 CLEANING SOLENOID CIRCUIT DC Drive PCB Main PCB Cleaning Interface PCB Scan 2 Scan 2 Overload Sensor A171D527.wmf The main PCB energizes RA301 and 303 for 0.3 seconds to supply +38 V for the cleaning blade solenoid at the initial solenoid activation. The RA301 and 303 are then turned off and +24 V is supplied to the cleaning solenoid.
Page 90 CLEANING 31 July 1995 9.8 CLEANING BLADE SOLENOID CONTROL A171D598.img Start Key Cleaning Sol. Main Motor A171D526.wmf The main motor turns in reverse for 40 pulses at the end of every copy job. At this time, the cleaning solenoid is kept on to clean off the toner on the cleaning blade edge.
Page 91 31 July 1995 QUENCHING 10. QUENCHING A171D604.img To neutralize any charges remaining on the drum, a cold cathode fluorescent lamp [A] (CFL) is used as the quenching device. When the main PCB sends a trigger signal to the the CFL stabilizer [B], an ac power (ac 480 V/5 mA) is supplied to the CFL.
Page 92: Paper Feed
PAPER FEED 31 July 1995 11. PAPER FEED 11.1 OVERVIEW A171D535.wmf A171D536.img This machine feeds paper from three trays. (Capacity: 1st tray [A]: 500, 2nd tray [B]: 500, 3rd tray [C]: 1700). In addition to the copier paper feed stations, there is one LCT ([D]: capacity: 3000) feed station also, the by-pass feed table station [E] is equipped to the European ARDF/SS version machine Paper is positioned at the center of the trays.
Page 93: Paper Feed And Separation
31 July 1995 PAPER FEED 11.2 PAPER FEED AND SEPARATION A171D616.img While the main motor is rotating, the paper feed clutch gear [A] is being driven from the main motor drive and is always rotating. The separation roller shaft [B] is turning in the direction indicated by the arrow in the illustration. The separation roller driven by the separation roller shaft is prevented from turning in the paper feed direction by the built-in torque limiter [C].
Page 94 PAPER FEED 31 July 1995 A171D623.img Using the paper feed trigger signal from the main control board the paper feed clutch [A] turns on and paper feed roller shaft [B] begins to turn. A one-way clutch drives the paper feed roller [C]. The pick-up roller [D] rotates via an idler gear.
Page 95 31 July 1995 PAPER FEED 11.3 FRR OPERATION A171D654.img The direction in which the separation roller turns depends on the frictional forces acting on it. The magnetic torque limiter applies a constant clockwise force [F1]. When there is a single sheet of paper being driven between the rollers, the force of the friction between the feed roller and paper [F2] is greater than F1.
Page 96: Slip Clutch Mechanism
PAPER FEED 31 July 1995 11.4 SLIP CLUTCH MECHANISM A171D537.wmf A171D538.img The slip clutch [A] consists of the input hub [B] and the output hub [C] which is the case of the clutch as well. The magnetic ring [D] and the steel spacers [E] are fitted onto the input hub.
Page 97 31 July 1995 PAPER FEED 11.5 PAPER RETURN MECHANISM A171D624.img 3 mm A171D633.img The paper feed clutch [A] turns on and the paper feed roller shaft turns in the direction indicated by the arrow in the illustration. The swing lever [B] is raised by spring tension until it contacts the stopper [C].
Page 98: Paper End Detection
PAPER FEED 31 July 1995 11.6 PAPER END DETECTION 1st, 2nd, and 3rd Trays A171D617.img A171D615.img The paper end sensor [A] is installed at the rear of the tray bottom plate. The paper end condition is detected by the photo-interrupter and feeler [B]. When there is no paper remaining in the tray, the feeler rises from the tray bottom hole to deactuate the photo-interrupters for the LCT, and to actuate the photo-interrupter for the 1st, 2nd, and 3rd Trays.
Page 99: Paper Volume Detection
31 July 1995 PAPER FEED 11.7 PAPER VOLUME DETECTION A171D655.img Each tray uses a pulse generator [A] to determine the quantity of paper in the tray. The amount of paper present is based on the number of pulses generated between the time the tray starts moving up and the time the upper limit sensor turns off.
Page 100: Paper Tray Drive Mechanism
PAPER FEED 31 July 1995 11.8 PAPER TRAY DRIVE MECHANISM 11.8.1 1st, 2nd, and 3rd Trays 1st, 2nd, and 3rd Trays A171D628.img A171D620.img A171D629.img Drive from a reversible motor [A] is transmitted trough a worm gear [B] to the drive pulley [C] shaft. The tray wires have metal beads on them. These beads are inserted in the slots at the ends of the tray support bracket [D] of the bottom plate, so, when the wire pulley turns (counterclockwise, rear view), the beads on the wires drive the tray support bracket and the tray moves...
Page 101 31 July 1995 PAPER FEED 11.8.2 LCT A171D626.img A171D613.img A171D614.img Drive from a reversible motor [A] is transmitted trough a timing belt and a worm gear [B] to the drive gear [C] shaft. The tray chains connect the ends of the tray support bracket [D] of the bottom plate, so, when the drive gear turns (clockwise, rear view), the chains drive the tray support bracket and the tray moves upward.
Page 102: Tray Lock Mechanism
PAPER FEED 31 July 1995 11.9 TRAY LOCK MECHANISM 11.9.1 1st, 2nd, and 3rd Trays A171D634.img A171D647.img When the tray is set, it is positioned by the lock arm [A]. The roller of the lock arm presses against the lock plate [B]. And the lock lever [C] engages tray stopper [D] to prevent the tray from being pulled out while the tray is in the up position.
Page 103 31 July 1995 PAPER FEED 11.9.2 LCT A171D622.img When the tray is set, it is positioned by the lock arm [A]. The roller of the lock arm presses against the lock plate [B]. And the lock lever [C] engages the right side plate stopper [D] to prevent the tray from being pulled out while the tray is in the up position.
Page 104: Side-To-Side Registration
PAPER FEED 31 July 1995 11.10 SIDE-TO-SIDE REGISTRATION A171D652.img 1st, 2nd, 3rd Trays A171D611.img The tray stopper [A] is fixed to the tray side. The tray stopper bumper [B] is fixed to the main body or tray body. The tray stopper and bumper determine the side-to-side registration.
Page 105: Paper Size Detection
31 July 1995 PAPER FEED 11.11 PAPER SIZE DETECTION 11.11.1 LCT A171D539.img The rear side fence [A] and front side fence [B] can be moved to change the paper size. This is accomplished by loosening the screw and moving the rear and front side fences to another slot.
Page 106 PAPER FEED 31 July 1995 11.11.2 1st and 2nd Trays A171D621.img The operator can easily adjust the paper side guide posts [A] and end plate [B] for any paper size by pressing the stopper lever and sliding the side guide posts and end plate to the desired position.
Page 107 31 July 1995 PAPER FEED 11.11.3 3rd Trays A171D565.img The rear side fence [A] and front side fence [B] can be moved to change the paper size. This is accomplished by loosening the screw and moving the rear and front side fences to another slot. To indicate the paper size on the screen, it is required to set the paper size in SP mode.
Page 108 PAPER FEED 31 July 1995 11.12 LCT & 3RD TRAY END FENCE A171D650.img A171D651.img When the tray is pulled out, the rear fence [A] is held in place by the front stay [B]. This makes paper setting easier. When the tray is pushed in, the rear side plate [C] guides the rear fence to its home position.
Page 109 31 July 1995 PAPER FEED 11.13 FEED UNIT DRIVE MECHANISM A171D564.img Feed roller drive of the LCT and by-pass feed table is provided by the copier main motor. Drive from the transport section [A] of the copier main motor is transmitted via gears and a timing belt to the LCT and by-pass feed table paper feed mechanism [B, C].
Page 110 TRANSPORT UNIT AND REGISTRATION 31 July 1995 12. TRANSPORT UNIT AND REGISTRATION 12.1 OVERVIEW A171D540.img The copy paper comes from the 4 paper paths to the registration rollers [A], which correct paper skew and then feed the paper to the drum at the proper time for image transfer.
Page 111: Vertical Transport
31 July 1995 TRANSPORT UNIT AND REGISTRATION 12.2 VERTICAL TRANSPORT A171D643.img A171D625.img This copier has right and left vertical transport units. The right vertical transport unit has relay rollers [A] and their guide plates for the duplex and 1st, 2nd, and 3rd trays. The vertical transport unit with 1st and 2nd trays or 3rd tray can be slid out by the 2 accurides [B] (upper and lower).
Page 112 TRANSPORT UNIT AND REGISTRATION 31 July 1995 12.4 DRIVEN GUIDE PLATE OPEN MECHANISM A171D653.img A171D627.img The driven guide plate [A] is supported by the support bracket [B]. Torsion springs [C] hold it in the closed position. There are magnets [D] at the front and rear.
Page 113 31 July 1995 TRANSPORT UNIT AND REGISTRATION 12.6 PAPER DUST CLEANING ROLLER A171D632.img Paper passes the paper dust cleaning roller [A] before it reaches to the registration roller [B]. The paper dust cleaning roller has a teflon-coated roller, which is charged by the friction with the scraper [C] contacted, and attracts the paper dust, and removes it from copy paper.
Page 114 TRANSPORT UNIT AND REGISTRATION 31 July 1995 12.7 DRIVE MECHANISM A171D630.img A171D619.img All transport section rollers (with the exception of the registration roller) begin to rotate together with the main motor [A]. The registration clutch [B] engages according to the appropriate registration timing. When the clutch engages, the registration roller will begin to rotate.
Page 115 31 July 1995 FUSING 13. FUSING 13.1 OVERVIEW A171D618.img A171D649.img The image fusing on the copy paper is made by the hot roller [A] and pressure roller [B]. The hot roller has three heat pipes [C]. These pipes deliver extra heat from both ends of the hot roller to the center of the roller to distribute heat evenly along the roller.
Page 116 FUSING 31 July 1995 13.2 HEAT PIPE CONFIGURATION AND OPERATION PRINCIPLES A171D631.img The heat pipes are hollow metal tubes. Water capillary tubes [A] run along the inside of the heat pipe. These capillary tubes are used as heat transfer elements. When one end of the heat pipe is superheated [B], it causes vaporization.
Page 117: Pressure Mechanism
31 July 1995 FUSING 13.3 PRESSURE MECHANISM A171D641.img The fusing pressure is constantly applied between the hot roller [A] and pressure roller [B] by the upper pressure lever [C] and lower pressure lever [D] which are lifted up by the fusing unit release lever [E] via the pressure cam [F].
Page 118: Oil Supply
FUSING 31 July 1995 13.4 OIL SUPPLY A71D612.img A171D610.img The oil supply roller [A] is soaked with silicon oil [B]. The roller contacts the hot roller by a spring. It turns with the hot roller and applies a light coat of silicon oil to the hot roller.
Page 119 31 July 1995 FUSING 13.5 DE-CURLING AND COOLING MECHANISM A171D642.img A171D639.img The de-curling roller [A] cools the copy paper exiting through the fusing unit. This prevents sheets in the duplex tray from sticking together because the toner is too hot. The copy paper may be back-curled after it passes the fusing unit.
Page 120: Fusing Drive Mechanism
FUSING 31 July 1995 13.6 FUSING DRIVE MECHANISM A171D640.img A171D638.img Main motor drive is provided to the fusing unit through the transport timing belt [A], fusing drive belt [B], and fusing drive gear [C]. The fusing unit and fusing drive section are precisely positioned by the position guide [D]. This minimizes the fusing drive load and prevents drive gear abrasion.
Page 121 31 July 1995 FUSING 13.7 FUSING LAMPS OPERATION D (198°C) C (195°C) B (185°C) A171D541.img Warm up: After the main switch is turned on, the 1600 W lamp turns on. The lamp stays on until the temperature reaches 198°C. The ready temperature is 185°C, when the drum heater is ready.
Page 122 FUSING 31 July 1995 Lower limit temperature: A4/A3 version SP mode RESET 175°C 180°C USER (175°C) (185°C) TOOL 175°C 185°C (185°C) (190°C) ( ): Cover sheet or slip sheet mode (Thick paper) To continue the copy run in low fusing temperature conditions as long as possible, the software has been changed to lower the copy speed when the fusing temperature drops to a certain temperature.
Page 123 31 July 1995 INVERTER AND PAPER EXIT 14. INVERTER AND PAPER EXIT 14.1 OVERVIEW A171D644.img A171D637.img After passing the fusing unit, copies come to the inverter unit which chiefly consists of the inverter roller [A], inverter gate [B], inverter gate solenoid [C], return drive rollers [D], return pinch rollers [E], pinch solenoid [F], junction gate [G], and junction gate solenoid [H].
Page 124: Duplex Copying
INVERTER AND PAPER EXIT 31 July 1995 14.2 ORDINARY COPYING As the inverter gate [A] stays at the upper position (the inverter gate solenoid stays off) and the junction gate [B] stays at the lower position (the junction gate solenoid stays off), copies go straight through the inverter rollers to the exit rollers.
Page 125 31 July 1995 INVERTER AND PAPER EXIT 14.4 OVERLAY IMAGE COPYING The inverter gate solenoid and junction gate solenoid turn on. As the inverter gate turns counterclockwise, it directs copies up between the inverter guide plates [A]. The trailing edge of the copy passes the fusing sensor.
Page 126 DUPLEX 31 July 1995 15. DUPLEX 15.1 OVERVIEW A171D542.wmf Copies are fed to the duplex tray when in duplex copying or overlay copying mode. The copies wait in the tray until the copying of the second original starts. The duplex tray has a maximum capacity of 50 sheets. When a copy number greater than 50 is entered, 50 (copies) is displayed in the copy entered counter and only 50 copies are printed.
Page 127 31 July 1995 DUPLEX 15.2 DUPLEX ENTRANCE A171D543.wmf A171D549.img A171D544.wmf Copies transported from the inverter section pass through the relay guide plates [A] to the duplex tray. To clear paper jams between the inverter section and duplex tray, the relay guide plate can be opened and closed by the spring [B].
Page 128 DUPLEX 31 July 1995 15.3 STACKING MECHANISM A171D545.wmf The pressure plate solenoid [A] energizes while the duplex entrance sensor [B] is actuated. The pressure plate [C] is lowered during this period. This prevents the paper stack from being moved by the paper sheet entering the duplex tray.
Page 129 31 July 1995 DUPLEX 15.4 JOGGER A171D546.wmf When the start key is pressed to start a duplex or overlay copy cycle, the jogger fence drive motor [A] drives the jogger fences [B] inward from the home positions to the waiting positions which are 10 mm away from the edges of the stacked paper.
Page 130: Duplex Paper Feed
DUPLEX 31 July 1995 15.5 DUPLEX PAPER FEED A171D547.wmf The paper in the duplex tray is fed from the bottom sheet to the top sheet. After all copies are stacked in the duplex tray, the duplex pressure plate solenoid [A] turns on to lower the pressure plate [B] so that the pressure plate presses the paper against the pick-up roller [C].
Page 131 31 July 1995 DUPLEX 15.6 DUPLEX UNIT LOCK MECHANISM A171D550.img Like the paper tray, the duplex tray is positioned by the lock arm [A]. The roller on the lock arm presses against the lock plate [B]. The duplex tray stopper [C] is attached to the top of the lock arm. The tray stopper bumper [D] is attached to the main copier.
Page 132: Duplex Drive Mechanism
DUPLEX 31 July 1995 15.7 DUPLEX DRIVE MECHANISM A171D548.wmf The duplex tray is driven by the main motor. The drive [A] from the main motor is transmitted to the duplex tray drive gear [B]. The duplex tray drive gear distributes the drive to each roller. While the duplex paper feed clutch [C] is on, drive is transmitted to the duplex feed roller [D].
Page 133 31 July 1995 DUPLEX Timing Chart 1. Stack A171D551.wmf 2. Paper Feed A171D552.wmf 2-109...
Page 134 ARDF 31 July 1995 16. ARDF 16.1 OVERVIEW A171D673.img 1. One-sided Original Feed When the start key is pressed after an original is set face down on the original table [A], the bottom sheet of the original stack is fed onto the exposure glass [B] by the rollers [C] and the transport belt [D].
Page 135: Original Detection
31 July 1995 ARDF 16.2 ORIGINAL DETECTION a171D674.img A171D664.img When an original is set on the original table [A] , the original sensor feeler [B] is pushed up by the original and the original sensor [C] is activated. The paper feed tray has an insert original indicator [D] and an auto feed indicator [F].
Page 136: Original Size Detection
ARDF 31 July 1995 16.3 ORIGINAL SIZE DETECTION A171D658.img U.S.A. Sensor Size HLT sideways,10 " x 8", LT lengthwise LT sideways A4 sideways, F4 sideways LG sideways, 15" x 11", 14" x 10" DLT sideways Europe Sensor Size A4 lengthwise, B5 sideways, 10" x 8", A5 LT sideways A4 sideways F, F4...
Page 137 31 July 1995 ARDF 16.4 ORIGINAL SEPARATION A171D667.img A171D662.img Paper is fed by friction between the separation rollers [A] and the friction tab [B]. Friction tab permit only the bottom sheet of the set of originals to be fed by the separation rollers and the pick-up rollers [C] to the relay rollers [D].
Page 138: Pick-Up Roller
ARDF 31 July 1995 16.5 PICK-UP ROLLER A171D675.img A171D676.img A171D685.img The entrance guide mylar [A] holds the originals against the pick-up roller [B] to facilitate paper feed. The pressure release cam [C] lobe pushes the lever [D] upward to release the pressure mylar [E].
Page 139: Original Feed Drive Mechanism
31 July 1995 ARDF 16.6 ORIGINAL FEED DRIVE MECHANISM A171D669.img A171D668.img The two-directional feed-in motor [A] drives the pick-up rollers [B], the separation rollers [C], and the relay rollers [D]. Three one-way clutches (two gears [E] and a pulley [F]) control the rollers’ rotation. Upon receiving the paper-feed signal from the copier, the paper feed motor turns in the direction shown by the black arrow in the illustration.
Page 140 ARDF 31 July 1995 16.7 RELAY ROLLER PRESSURE RELEASE MECHANISM A171D686.img A171D663.img When the entrance cover [A] is opened, the bushing [B] of the pull-out roller is pressed down by the raised portion of the friction tab frame [C]. This releases the relay roller pressure to make misfed original removal easier.
Page 141: Original Transport Mechanism
31 July 1995 ARDF 16.8 ORIGINAL TRANSPORT MECHANISM A171D683.img A171D681.img Three pressure rollers [A] are built into the transport unit to maintain friction between the transport belt [B] and the original. Transport belt tension is provided by two springs [C]. The transport belt is driven by a dc motor [D].
Page 142 ARDF 31 July 1995 Thin Paper Mode A171D660.img Thick Paper Mode A171D659.img Customers can choose the paper transport mode by "User Tool" depending on the thickness of the original used. – In thin paper mode – The belt motor stops exactly when the trailing edge of the original passes the right scale [A] edge.
Page 143 31 July 1995 ARDF 16.9 TRANSPORT UNIT LIFT MECHANISM A171D657.img A171D679.img To make opening the transport unit easier, there are six balance springs [A]. Three springs are on the right and three on the left. There is a lift sensor [B] to detect if the transport unit opens. When the transport unit is opened, the feeler [C] actuates the lift sensor.
Page 144 ARDF 31 July 1995 16.10 TRANSPORT BELT UNIT / INVERTER COVER A171D678.img A171D670.img The inverter cover [A] and the transport belt unit [B] can be opened to allow easy removal of original jams. The transport unit can be opened by sliding the release lever [C] to the right.
Page 145 31 July 1995 ARDF 16.11 ORIGINAL INVERTER MECHANISM A171D661.img A171D666.img When the inverter signal is received from the copier, the belt motor (drives transport belt [A]) and the inverter motor (drives inverter rollers [B] and exit rollers [C]) start rotating. Simultaneously, the inverter gate solenoid turns on to open the upper inverter gate [D] and lower inverter gate [E].
Page 146 ARDF 31 July 1995 A171D672.img For original inversion, the inverter gate solenoid [A] turns on and the upper [B] and lower [C] inverter gates open to create an inverter loop path. An inverter entrance sensor [D] and an inverter registration sensor [E] (reflection-type photosensors) are located in the inverter loop path.
Page 147: Switch Back Mechanism
31 July 1995 ARDF 16.12 SWITCH BACK MECHANISM A171D684.img A171D682.img A171D677.img To return the inverted originals to their original page order, the originals are inverted again and traveled to the switch back tray [A] before being fed-out from the document feeder. When the inversion signal is received from the copier, the inverter solenoid turns on to open the upper and lower inverter gates [B].
Page 148 ARDF 31 July 1995 16.13 INVERTER DRIVE MECHANISM A171D656.img The inverter unit is driven by a dc motor [A]. The drive of the inverter motor [A] is transmitted to the exit rollers [B] through the two one-way clutches [C]. The exit rollers rotate in the same direction due to the function of these one-way clutches.
Page 149 31 July 1995 ARDF 16.14 CFF MECHANISM A171D665.img A171D671.img There are four guides to maintain computer paper transport and stacking capabilities. The CFF stopper [A] of the paper feed unit prevents the original from entering the ADF paper feed entrance. The rear CFF guide [B] prevents side to side movement of the original to ensure that the CFF sensor [C] counts the holes lined up on the computer form.
Page 150: Operation Unit
OPERATION UNIT 31 July 1995 17. OPERATION UNIT IC131 CGROM IC137 ROM1 IC138 ROM0 Serial Interface Main PCB A171D687.img A CRT (9 inches) [A] and a touch panel are used to achieve easy machine operation. The touch panel consists of a transparent film [B] and a glass sheet [C] on which transparent matrix conductors (32 x 25 lines) are printed.
Page 151 31 July 1995 MOVING ORIGINAL SCAN AND BY-PASS FEED TABLE 18. MOVING ORIGINAL SCAN AND BY-PASS FEED TABLE 18.1 MOVING ORIGINAL SCAN MODE A171D553.img A171D554.img A171D555.img Moving original scan mode enables the machine to make copies of an original which is bigger than the exposure glass. In this mode, the scanner position is fixed at the center of the exposure glass (at this time, the sheet-through H.
Page 152 MOVING ORIGINAL SCAN AND BY-PASS FEED TABLE 31 July 1995 18.2 ORIGINAL FEED IN MOVING ORIGINAL SCAN MODE A171D556.img The sheet pressure rollers [A] are released from the sheet feed rollers [B] in the stand-by condition. In this condition, an original can be inserted until it hits the entrance gate [C].
Page 153 31 July 1995 MOVING ORIGINAL SCAN AND BY-PASS FEED TABLE A171D558.img A171D557.img After the 1st scanner is moved to the scan position (center of the exposure glass), the inverter motor and the belt motor start to feed the original again. At the same time, the sheet-through guide solenoid [A] and the original scale solenoid [B] of the copier main body are energized to move the guide [C] and scale [D] to the sheet-through position.
Page 154: By-Pass Table
MOVING ORIGINAL SCAN AND BY-PASS FEED TABLE 31 July 1995 18.3 BY-PASS TABLE A171D559.img When the by-pass table is opened, the by-pass table sensor [A] is actuated. In this condition, only the by-pass table can be used as a paper tray. The by-pass tray capacity is 40 sheets (80 g/m).
Page 155 31 July 1995 MOVING ORIGINAL SCAN AND BY-PASS FEED TABLE 18.4 PAPER SIZE DETECTION A171D560.img Detected Size in Normal Mode Detected Size in Moving Original Scan Mode Paper Size Sensor 1 Paper Size Sensor 2 Paper Size Sensor 3 Paper Size Sensor 4 1 = Interrupted 0 = Not Interrupted S = Sideway L = Lengthwise Four photo-interrupters [A] are used to detect paper width on the by-pass tray.
Page 156 MOVING ORIGINAL SCAN AND BY-PASS FEED TABLE 31 July 1995 18.5 PAPER END DETECTION A171D561.img When paper is set on the by-pass feed table, the paper end sensor [A] is not actuated. After the last sheet is fed, the feeler [B] actuates the sensor and the paper end condition is detected.
Page 157: Paper Feed Mechanism
31 July 1995 MOVING ORIGINAL SCAN AND BY-PASS FEED TABLE 18.6 PAPER FEED MECHANISM A171D562.img A171D563.img When the Print key is pressed in the by-pass feed mode, the by-pass gate solenoid [A] is energized and the gate pawls [B] move down. Then the main motor starts rotating.
Page 158 MOVING ORIGINAL SCAN AND BY-PASS FEED TABLE 31 July 1995 18.7 BY-PASS FEED DRIVE MECHANISM A171D564.img The paper feed clutch [A] is energized at the same time as the main motor starts rotating. The main motor drive is transmitted to the paper feed clutch gear [B] which controls the paper feed timing of the by-pass tray.
Page 159: Installation
SECTION 3 INSTALLATION...
Page 160: Installation Requirement
31 July 1995 INSTALLATION REQUIREMENT 1. INSTALLATION REQUIREMENT 1.1 ENVIRONMENT 1. Temperature Range: 10°C to 30°C (50°F to 86°F) 2. Humidity Range: 15% to 90% RH 3. Ambient Illumination: Less than 1,500 lux (do not exposure to direct sunlight) 4. Ventilation: Minimum space 20 m .
Page 161: Minimum Space Requirements
INSTALLATION REQUIREMENT 31 July 1995 1.3 MINIMUM SPACE REQUIREMENTS More than With 2 sorters + LCT 15.8" (400 mm) More than More than 11.8" (300 mm) 11.8" (300 mm) More than 39.4" (1000 mm) A171I508.img With 1 sorter + LCT More than 15.8"...
Page 162: Power Requirements
31 July 1995 INSTALLATION REQUIREMENT 1.4 POWER REQUIREMENTS 1. Input voltage level: 240 V/60 Hz: 20A or more (for U.S.A. version) 220 V/230 V/240 V/50 Hz: 13A or more (for European version) 2. Permissible voltage fluctuation: ±10% 3. Do not set anything on the power cord. CAUTION: a) Make sure the plug is firmly inserted in the lutlet.
Page 163: Accessory Check
ACCESSORY CHECK 31 July 1995 2. ACCESSORY CHECK Check the quantity and condition of the accessories in the box according to the following list: 1. Operation Unit ......... 1 2. Operation Unit Stand ....... 1 3. Fusing Unit Release Lever ...... 1 4.
Page 164 31 July 1995 INSTALLATION PROCEDURE (COPIER) 3. INSTALLATION PROCEDURE (COPIER) A171I500.wmf A171I502.wmf A171I514.wmf CAUTION: While the leveling shoes are not installed, do not completely pull out many units simultaneously. Otherwise, the machine could topple. NOTE: Keep the shipping retainers after installing the machine. They will be reused if in the future the machine is transported to another location.
Page 165 INSTALLATION PROCEDURE (COPIER) 31 July 1995 A171I522.img A171I523.img A171I503.wmf 5. Remove the fusing cover [A] (3 screws), fixing bracket [B] (1 screw), and reinstall the fusing cover. Install the fusing unit release lever [C], turn the lever clockwise, and fix it (1 M5 x 8 screw). 6.
Page 166 31 July 1995 INSTALLATION PROCEDURE (COPIER) A171I527.img A171I520.img A171I526.img 7. Remove the front scale holder [A] (2 screws), front scale [B] (2 screws), exposure glass [C], left top cover [D] (7 screws), and right rear cover [E] (front view, 2 screws). 8.
Page 167 INSTALLATION PROCEDURE (COPIER) 31 July 1995 A171I525.img A171I516.img A171I529.img 11. Remove the charge corona unit [A] (1 connector and 1 clamp) and erase unit [B]. 12. Lower the transport unit by the lever [C] as shown and remove the drum stay [D] and cleaning unit [E].
Page 168 31 July 1995 INSTALLATION PROCEDURE (COPIER) A171D517.img A171D515.img 15. Remove the development filter [A] from the development unit. 16. Pour the developer (1 bag: 1.7 kg) evenly between the left and right side of the development unit and reinstall the development filter. Then, reinstall the development unit (1 connector and 1 screw), and PTC unit on the copier.
Page 169 INSTALLATION PROCEDURE (COPIER) 31 July 1995 A171I513.img A171D528.img A171I506.img 19. Connect the operation unit [A] to the operation unit stand [B] (4 screws and 2 connectors). 20. Install the operation unit (1 M5 x 8 screw [C] and 1 connector [D]) and the operation unit stopper [E] (2 M5 x 8 screws).
Page 170 31 July 1995 INSTALLATION PROCEDURE (COPIER) A171I511.img A171I507.img A171I521.img A171I504.wmf 23. Insert the leveling shoes [A] under the feet, and level the machine by securing down the feet. 24. Insert the sponge cushion [B]. 25. European version machines only. If the voltage of electrical power supply from wall outlets is 220 V or 240 V, change the voltage as follows: a) Disconnect the input line [C] from the 230 V connector.
Page 171 INSTALLATION PROCEDURE (COPIER) 31 July 1995 A171I501.img 26. Guidance ROM Kit installation (-27 versions only). Remove the operation unit rear cover [A] (4 screws) and install the appropriate ROMs [B] to the operation unit board. Distinguish the chips (0, 1, and c) by the last 2 digits of their part number.
Page 172: A3/11" X 17" Counter Installation
31 July 1995 INSTALLATION PROCEDURE (COPIER) 3.1 A3/11" x 17" COUNTER INSTALLATION A171I524.img CAUTION: Unplug the copier power cord before starting the following procedure. 1. Open the right front door and remove the right inner cover [A] (3 screws). 2. Install the A3/11" x 17" counter [B] (1 connector). 3.
Page 173: Key Counter Holder Installation
INSTALLATION PROCEDURE (COPIER) 31 July 1995 3.2 KEY COUNTER HOLDER INSTALLATION A171I519.img A171I518.img CAUTION: Unplug the copier power cord before starting the following procedure. NOTE: The Key Counter Bracket Set includes the following parts. The key counter holder and key counter should be procured locally. 1.
Page 174: Installation Procedure (Lct)
31 July 1995 INSTALLATION PROCEDURE (LCT) 4. INSTALLATION PROCEDURE (LCT) A171I537.img A171I530.img Check the quantity and condition of the accessories in the box according to the following list. 1. By-pass Feed Lower Cover (European version only) ..........1 2. By-pass Rear Lower Cover (European version only) ..........1 3.
Page 175 INSTALLATION PROCEDURE (LCT) 31 July 1995 A171I531.img A171I538.img A171I535.img 5. Remove the left lower cover [A] (3 screws) of the copier and remove the 3 caps [B]. Remove the upper by-pass feed cover [C] (2 screws: U.S.A. version only) and lower by-pass feed cover [D] (2 screws). 6.
Page 176 31 July 1995 INSTALLATION PROCEDURE (LCT) A171I533.img A171I536.wmf A171I534.img A171I532.img 9. Reinstall all the covers. 10. Install the LCT grounding wire [A] together with the grounding wire [B] from the power supply unit by removing and putting back the screw. 11.
Page 177: Service Tables
SECTION 4 SERVICE TABLES...
Page 178: Service Remarks
31 July 1995 SERVICE REMARKS 1. SERVICE REMARKS 1.1 HANDLING THE DRUM 1. Never expose the drum to direct sunlight. 2. Never expose the drum to direct light of more than 1,000 Lux for more than 5 minutes (sunlight is about 1,360 Lux). 3.
Page 179: Charge Corona Unit
SERVICE REMARKS 1 July 1995 1.2 CHARGE CORONA UNIT 1. Clean the charge corona casing with water first to remove NOx. Then clean it with alcohol if any toner still remains on the casing. 2. The corona wires can be cleaned only with a dry soft cloth. Using water or alcohol may damage the coating of the wire surface.
Page 180: Development Unit
31 July 1995 SERVICE REMARKS 1.4 ERASE LAMP AND POTENTIAL SENSOR 1. Use water to clean the erase lamp unit and then use a dry soft cloth. 2. After cleaning the erase lamp unit, rub it lightly with your finger to discharge any static electricity on the surface.
Page 181: Transfer And Separation
SERVICE REMARKS 1 July 1995 1.6 TRANSFER AND SEPARATION 1. Clean the T & S corona casing with water, then with alcohol if necessary. 2. The corona wires can be cleaned only with a dry soft cloth. Using water or alcohol may damage the wire coating.
Page 182 31 July 1995 SERVICE REMARKS 1.9 PAPER FEED 1. Do not touch the pick-up, feed, and separation rollers with oily bare hands. 2. The side fences of the tray must be positioned correctly to align with the actual paper size to avoid paper misfeeds. 3.
Page 183: Service Program Mode Operation
SERVICE PROGRAM MODE 1 July 1995 2. SERVICE PROGRAM MODE 2.1 SERVICE PROGRAM MODE OPERATION The service program (SP) mode is used to check electrical data and change modes or adjustment values. 2.1.1 To Access SP Mode 1. Turn on DIP SW #3 on the Reset Switch PCB. 2.
Page 184: Sp Mode Function
31 July 1995 SERVICE PROGRAM MODE 2.2 SP MODE FUNCTION Jam Counters A171M501.img A171M542.img Location Code 1st Tray 2nd Tray 3rd Tray Not used Horizontal Transport Unit Registration Paper Separation Fusing Unit Paper Exit Duplex Entrance Duplex Paper Feed A171M502.img Duplex Exit By-pass Feed Table Diagonal Transport Unit...
Page 185 SERVICE PROGRAM MODE 1 July 1995 Daily / Weekly Jam Counters Week 1 means the first week of a month Counters are not cleared at the end of the week or month. For example, if this menu is A171M504.img displayed on Monday, the counters of Tuesday through Friday show the data for the previous week.
Page 186 31 July 1995 SERVICE PROGRAM MODE Copy Counters A171M507.img A171M543.img The test mode copy counter displays the number of copies in SP Test Mode This counter only counts up when A171M508.img Test Copy Counter ON is (SP mode PAGE 5). The block copy counter displays the number of copies made since a block copy counter clear was done...
Page 187 SERVICE PROGRAM MODE 1 July 1995 Daily/Weekly Copy Counters A171M509.img NOTE: To clear the counters, use SP mode (Counter Clear). Operating Time This displays the total rotation time of the main motor. Minutes are not displayed. A171M510.img NOTE: This counter can only be cleared by RAM clear. (Main board DIP SW #1: ON, #2: OFF) 4-10...
Page 188 31 July 1995 SERVICE PROGRAM MODE SC Counters A171M511.img A171M514.img A171M512.img A171M516.img A171M513.img A171M517.img A171M518.img A171M515.img NOTE: To clear the counters, use SP mode (Counter Clear). 4-11...
Page 189 SERVICE PROGRAM MODE 1 July 1995 Sensor Outputs ID Sensor ID sensor output for bare drum surface ID sensor output for pattern Drum Potential Sensor Vd set up value during the process control sequence VL set up value during the process control sequence VL value during the copy cycle Residual voltage during the...
Page 190 31 July 1995 SERVICE PROGRAM MODE Paper Feed Time Displays the interval between the time a paper feed clutch turns on and the time the registration sensor turns Reference Times (theoretical values assuming no paper slippage): If the displayed time varies by more than 32 ms, check the appropriate feed clutch if the clutch disk surface is dirty.
Page 191 SERVICE PROGRAM MODE 1 July 1995 SP Test Mode – 1 (PAGE 1 - 1) A171M521.img Sensors Turns on and off the 12-volt line of the dc drive board (CN302-2), which applies power to the sensors, and checks sensor operation. The sensors which are normally activated during the stand-by condition cannot be checked because sensor output does not change.
Page 192 31 July 1995 SERVICE PROGRAM MODE SP Test Mode – 2 (PAGE 1 - 2) A171M521.img Solenoids/Clutches Turns on and off the 24-volt lines to the solenoids and clutches from the main board, and checks component activity by monitoring the electrical current . Touch on the display.
Page 193 SERVICE PROGRAM MODE 1 July 1995 SP Test Mode – 3 (PAGE 1 - 3) A171M521.img Item Function Test Method Charge Cleaner Turns on the charge and T/S Touch START corona wire cleaners (one cycle). ID Sensor Adjusts Vsg automatically and 1.
Page 194 31 July 1995 SERVICE PROGRAM MODE SP Test Mode – 4 (PAGE 2) A171M522.img Test Procedure Touch on the display and press the "START" key top to start. Touch or press the "CLEAR/STOP" key top to stop. RESET Item Function Remarks Drum Conditioning Turns on the main motor, the...
Page 195 SERVICE PROGRAM MODE 1 July 1995 SP Test Mode – 5 (PAGE 3) A171M523.img Test Procedure Touch on the display and press the "START" key top to start. Touch or press the "CLEAR/STOP" key top to stop. RESET Item Function Remarks Cleaning Blade Turns off the cleaning blade.
Page 196 31 July 1995 SERVICE PROGRAM MODE SP Adjustment – 1 (PAGE 1, 2, and 3) A171M525.img A171M524.img 1. Function Turn on the individual power pack. Two or more power packs cannot be turned on at the same time in this mode. 2.
Page 197 SERVICE PROGRAM MODE 1 July 1995 SP Adjustment – 2 (PAGE 4) A171M527.img Change/ Item Function Range Step Transfer/Separation Changes the ON timing of normal Delay ON Approx. ± 16 Corona ON Timing separation corona after leading edge timing 2 mm Adj.
Page 198 31 July 1995 SERVICE PROGRAM MODE SP Adjustment – 3 (PAGE 5) A171M528.img Change/ Item Function Range Step Horizontal Magnification Adjusts the lens and the mirror unit Adjustment (Full Size) vertical stop position at the full size. Enlarge Horizontal Magnification Adjusts the lens and mirror unit ±...
Page 199 SERVICE PROGRAM MODE 1 July 1995 SP Adjustment – 4 (PAGE 6) A171M529.img Change/ Item Function Range Step Leading Edge Changes the ON timing of the Approx. Delay paper Registration Adj. registration clutch. 1 mm feeding Leading Edge Changes the leading edge erase. Approx.
Page 200 31 July 1995 SERVICE PROGRAM MODE SP Adjustment – 5 (PAGE 7) A171M530.img Change/ Item Function Range Step Registration Adj. Changes the ON timing of the Delay paper Approx. (Sheet Through) registration clutch in the moving feeding 1 mm original scan mode. Leading Edge Changes the leading edge erase in Widen erase...
Page 201 SERVICE PROGRAM MODE 1 July 1995 SP Adjustment – 6 (PAGE 8) A171M531.img Item Function Test Procedure ADF Motor Adjusts the paper feed motor, transport Adjustment motor, and inverter motor speed of the Touch START document feeder automatically. Change/ Item Function Range Step...
Page 202 31 July 1995 SERVICE PROGRAM MODE SP Adjustment – 7 (PAGE 9) A171M532.img Change/ Item Function Range Step Paper Feed Timing Adjusts the amount of paper buckle Increase Adjustment at the registration rollers for each amount paper feed. When the registration Approx.
Page 203 SERVICE PROGRAM MODE 1 July 1995 SP Adjustment – 8 (PAGE 10) A171M533.img A171M544.img A171M534.img A171M545.img Change/ Item Function Range Step Jogger Span Adjusts the jogger position of the Widens the Adjustment (Duplex jogger fence for each paper size. span ±...
Page 204 31 July 1995 SERVICE PROGRAM MODE SP Special Feature – 1 (PAGE 1) A171M5351.img <PAGE 1> Item Function Setting Default Fusing Lower Select lower limit 170°C (Cover Mode - 170°C) – LT RESET RESET Temperature temperature to enter 175°C (Cover Mode - 175°C) – A4 Limit: High idling.
Page 205 SERVICE PROGRAM MODE 1 July 1995 SC Telephone No. SC Telephone No. 1. Touch 2. Enter the number by pressing the number key tops. (Touch to input a dialing pause) – 3. Touch SC Telephone No. Serial No. Serial No. 1.
Page 206 31 July 1995 SERVICE PROGRAM MODE SP Special Features – 2 (PAGE 2) A171M536.img A171M550.img Item Function 3rd tray does not have a paper size Tray 3 sensor. To indicate the paper size on the screen select a paper size. 4-29...
Page 207 SERVICE PROGRAM MODE 1 July 1995 SP Special Features – 2 (PAGE 4) A171M537.img Item Function Setting Default RESET RESET Process Control Disables process control. Enable OFF Mode Disable RESET RESET Process Control To maintain optimum copy quality, Auto Start Mode process control automatically works at 12 o’clock midnight even if the main switch is not turned off.
Page 208 31 July 1995 SERVICE PROGRAM MODE SP Special Features – 3 (PAGE 3) A171M540.img Item Function Default Remarks Tray Priority Select feed station at power No Select No Select selects 3rd tray on or after reset. without LCT or LCT. 4-31...
Page 209 SERVICE PROGRAM MODE 1 July 1995 SP Special Feature – 3 (PAGE 5) A171M538.img Item Function Setting Default 0.93 Magnification Selects the magnification when Ratio Priority is selected. Reduce/Enlarge RESET RESET Manual ID Selects the ID level when Auto Image Center Level Selection Density is changed to Manual Image...
Page 210 31 July 1995 SERVICE PROGRAM MODE SP Special Feature – 4 (PAGE 6) A171M539.img Item Function Setting Default Copy Number Selects the blade release 15 seconds (100 RESET RESET to Release timing after copying jobs. copies or more) Blade Pressure 5 minutes (less than 100 copies) 15 seconds (250...
Page 211 SERVICE PROGRAM MODE 1 July 1995 Connector for printer Copier Printer RS232C Pin No. Signal Pin No. Signal – – – – – – 4-34...
Page 212 31 July 1995 SERVICE PROGRAM MODE SP Special Features A171M541.img Item Function Indicates the ROM’s part number add its suffix on the main PCB and operation unit PCB ROM Part Number Main 1: IC154 Main 2: IC127 Operation unit 1: IC138 (ROM0) Operation unit 2: IC131 (ROMCG) NOTE: The suffix of IC137 (ROM1) should be the same as that of IC138 (ROM0).
Page 213 SERVICE PROGRAM MODE 1 July 1995 Counter Clear Clear A171M546.img A171M547.img Clear A171M548.img A171M549.img 1. Touch beside the counter you wish to clear. Clear 2. Touch to clear the counter. 4-36...
Page 214 31 July 1995 SERVICE PROGRAM MODE 2.3 SP MODE INDEX SP Menu Manual Index. Item Page Page A3 Counter ON Mode 4-27 A3 Double count 4-33 Access Code 4-27 4-11 ADF 1st Side Registration Adj. 4-24 ADF 2nd Side Registration Adj. 4-24 ADF Free Run Mode 4-17...
Page 215 SERVICE PROGRAM MODE 1 July 1995 SP Menu Manual Index. Item Page Page Drum Temperature 4-12 Duplex 4-11 Duplex Mode Copy Counter Duplex Tray Counter Clear 4-36 Enable Auto Reset function when key counter is 4-33 removed. Exposure 4-11 Exposure Lamp Adjustment 4-20 Exposure Lamp Heater Temperature 4-12...
Page 216 31 July 1995 SERVICE PROGRAM MODE SP Menu Manual Index. Item Page Page Original Counter Clear 4-36 Original Jam Counter Clear 4-36 Original jams by location Paper Feed 4-11 Paper Feed Time 4-13 Paper Feed Timing Adjustment 4-25 Paper Tray Copy Counter Paper Tray1 Counter Clear 4-36 Paper Tray2 Counter Clear...
Page 217 SERVICE PROGRAM MODE 1 July 1995 SP Menu Manual Index. Item Page Page Test Copy Counter ON 4-32 Test Mode Copy Counter Toner Density Selection 4-30 Toner Forced Supply Mode 4-18 Toner Supply Amount 4-30 Total Copies by Paper Size Total Copies by Paper Size Total jams Total No.
Page 218: Dip Switch Table
3.1 MAIN PCB Function Normal mode RAM clear SC detection disabled (except for fusing SCs) Not used Destination RICOH SAVIN Others NOTE: The Machine only detects DIP switch positions just after the main switch is turned on. 3.2 RESET SWITCH PCB Function...
Page 219: Preventive Maintenance Schedule
PREVENTIVE MAINTENANCE SCHEDULE 1 July 1995 4. PREVENTIVE MAINTENANCE SCHEDULE 4.1 PM TABLE NOTE: The amounts mentioned in the PM interval are copy numbers. C: Clean R: Replace L: Lubricate I: Inspect A: Adjustment 150K 300K 450K 600K NOTE OPTICS Mirrors, Lens, Soft cloth Reflector...
Page 220 31 July 1995 PREVENTIVE MAINTENANCE SCHEDULE 150K 300K 450K 600K NOTE Toner Filter Ozone Filter Replace at 1.2M Corona Casing Water/Alcohol Potential Sensor and Dry cloth/Blower brush Drum Thermistor Charge Corona Unit Blower brush Brush Seal Erase Lamp Water ID Sensor Water QL Filter Water...
Page 221 PREVENTIVE MAINTENANCE SCHEDULE 1 July 1995 150K 300K 450K 600K NOTE Oil Supply Roller Suitable solvent Bushing Stripper Pawls Suitable solvent I, C I, C I, C I, C Replace if damaged Fusing Drive Gears Mobil Temp 78 Guide Plates Suitable solvent De-curling Belt Alcohol...
Page 222: Regular Pm Schedule
31 July 1995 PREVENTIVE MAINTENANCE SCHEDULE 4.2 REGULAR PM SCHEDULE 1. Make A Copy (every 150K) 1. Make a copy of an OS-UA3 test chart at manual image density level 4. 2. Remove the developer. 3. Unplug the copier and 2nd sorter stapler. 2.
Page 223 PREVENTIVE MAINTENANCE SCHEDULE 1 July 1995 Every 600K 1. Clean the registration roller using water. 2. Adjust the 2nd tray drive chain tension. Every 1.2M 1. Replace the paper dust cleaning roller and the dust pan. 4. Duplex Unit (every 150K duplex copies) 1.
Page 224 31 July 1995 PREVENTIVE MAINTENANCE SCHEDULE 5. Clean the drum potential sensor and the drum thermistor using a dry cloth or blower brush. 6. Clean the erase lamp, the QL filter, and the ID sensor using water. 7. Clean the pick-off pawls with alcohol. Every 1.2M 1.
Page 225 PREVENTIVE MAINTENANCE SCHEDULE 1 July 1995 Every 300K 1. Replace the hot roller together with the bushings and the bearings. Every 600K 1. Replace the pressure roller together with the bushings and the bearings. 4-48...
Page 226: Lubrication Points
31 July 1995 LUBRICATION POINTS 5. LUBRICATION POINTS At an EM call or when the parts are getting dry, lubricate the following parts using a suitable lubricant. 5.1 MIRROR UNIT GUIDE ROD FELT Lubricant: Launa-40 oil or equivalent A171M558.img 5.2 LENS HORIZONTAL DRIVE MOTOR GEARS Lubricant: Mobil Temp 78 A171M560.img 4-49...
Page 227 LUBRICATION POINTS 1 July 1995 5.3 TRAY DRIVE WORM GEARS Lubricant: Mobil Temp 78 A171M554.img A171M559.img A171M555.img 5.4 PAPER FEED DRIVE GEARS Lubricant: Mobil Temp 78 A171M551.wmf A171M552.img 4-50...
Page 228 31 July 1995 LUBRICATION POINTS 5.5 FUSING DRIVE GEARS Lubricant: Mobil Temp 78 A171M557.img 5.6 DF BUSHINGS Interval: Every 1.2M originals Lubricant: Launa-40 oil or equivalent A171M553.img A171M556.img 4-51...
Page 229: Replacement And Adjustment
SECTION 5 REPLACEMENT ADJUSTMENT...
Page 230: Exterior And Inner Covers
31 July 1995 EXTERIOR AND INNER COVERS 1. EXTERIOR AND INNER COVERS 1.1 LEFT AND RIGHT DOOR REMOVAL A171R565.img 1. Remove the door stoppers [A] (1 screw each). 2. Lift the doors up and remove them by swinging out the bottom part of each door.
Page 231: Exterior Cover Removal
EXTERIOR AND INNER COVERS 31 July 1995 1.2 EXTERIOR COVER REMOVAL A171R510.imd – Left Covers – 1. Remove the left upper cover [A] (4 screws). 2. Remove the LCT (see LCT unit removal). 3. Remove the left lower cover [B] (3 screws). –...
Page 232: Upper Cover Removal
31 July 1995 EXTERIOR AND INNER COVERS 1.3 LEFT AND RIGHT INNER COVER A171R566.img 1. Open the front doors. 2. Remove the left inner cover [A] (4 screws). 3. Remove the right inner cover [B] (3 screws). 1.4 UPPER COVER REMOVAL A171R567.img 1.
Page 233: Exposure Glass Removal
OPTICS 31 July 1995 2. OPTICS 2.1 EXPOSURE GLASS REMOVAL A171R572.img 1. Lift the document feeder. 2. Remove the front scale holder [A] (2 screws and 2 plates). 3. Remove the front scale [B] (2 screws). 3. Loosen the three screws [C] securing the rear scale. 4.
Page 234: Exposure Lamp Replacement
31 July 1995 OPTICS 2.2 EXPOSURE LAMP REPLACEMENT A171R578.img 1. Remove the front upper cover [A] and rear top cover [B]. 2. Remove exposure glass [C] and rear scale [D] (3 screws). 3. Move the first scanner to the center.
Page 235 OPTICS 31 July 1995 A171R551.img 4. Remove the cover of the lamp intensity sensor fiber optics cable [A] (1 screw) and remove the cable end [B]. 5. Remove the front lamp holder [C] (2 screws) and pull out the lamp while holding the lamp heater [D].
Page 236 31 July 1995 OPTICS A171R573.img 6. Insert the new exposure lamp into the lamp heater so that the two terminal pins [A] are in a horizontal position and the lamp manufacturer mark [B] faces the rear. 7. Set the right terminal pin [C] of the lamp into the center of the rear lamp holder [D].
Page 237 OPTICS 31 July 1995 A171R575.img A171R574.img 11. Adjust the lamp heater position so that the lamp intensity sensor fiber optics cable can be properly installed. Confirm that the transparent part of the lamp is at the center of the heater opening (see figure). 12.
Page 238 31 July 1995 OPTICS 2.3 SCANNER FLAT CABLE AND FIBER OPTICS CABLE REPLACEMENT A171R550.img 1. Remove the left and right rear covers, and left upper cover. 2. Remove the DF transport unit. 3. Remove the exposure glass. 4. Remove the rear upper and rear top covers. 5.
Page 239 OPTICS 31 July 1995 A171R553.img A171R.584.img A171R581.img 7. Remove the flat cable holder fixed on the first scanner [A] (2 screws). 8. Slide out the flat cable holder bracket [B] (1 screw) and remove the holder [C] (2 screws). 9. Remove the flat cable [D] (3 connectors). 10.
Page 240: Scanner Drive Wire Replacement
31 July 1995 OPTICS 2.4 SCANNER DRIVE WIRE REPLACEMENT A171R554.img 1. Unplug the machine. 2. Remove the following covers: Left and right covers Left and right rear covers Left upper cover Front top cover Rear upper and rear top covers 3.
Page 241 OPTICS 31 July 1995 A171R530.img 6. Remove the upper optics housing [A] (4 screws at front, 4 screws on top, and 1 connector [B]). 7. Loosen the front and rear wire clamps [C] of the first scanner (2 screws each). NOTE: Do not loosen any screws which are marked with white paint.
Page 242 31 July 1995 OPTICS A171R560.img A171R583.img 12. Secure the second scanner position using two positioning pins [A] (special tool). 13. Position the drive pulley [B] as shown in the figure and secure it with the scanner fixing screw [C]. NOTE: The scanner fixing screw is removed during installation. 5-13...
Page 243 OPTICS 31 July 1995 A171R556.img – Blue Wire – 14. Set the bead of the blue wire [A] into the slot of the scanner drive pulley as shown and wrap the wire three and a half times on the pulley from bottom to top, counterclockwise.
Page 244 31 July 1995 OPTICS A171R559.img – Gray Wire – 17. Set the bead of the gray wire [A] into the slot of the scanner drive pulley as shown and wrap the wire four times on the pulley from bottom to top, counterclockwise.
Page 245 OPTICS 31 July 1995 A171R555.img – Black Wire – 20. Set the bead of the black wire [A] into the slot of the scanner drive pulley as shown and wrap the wire four times on the pulley from top to bottom clockwise.
Page 246 31 July 1995 OPTICS A171R558.img – Red Wire – 23. Set the bead of the red wire [A] into the slot of the scanner drive pulley as shown and wrap the wire three and a half times on the pulley from top to bottom clockwise.
Page 247 OPTICS 31 July 1995 A171R552.img 26. Remove the scanner positioning pins [A] and the scanner fixing screw [B], and apply tension to the wires by fixing the wire tension brackets [C]. – Second Scanner Position Adjustment – 27. Slide the second scanner [D] back and forth several times manually. 28.
Page 248 31 July 1995 OPTICS A171R551.img 30. Reinstall the first scanner and fix the front guides (1 screw each). – First Scanner Position Adjustment – 31. Set four positioning pins [A] to the first and second scanners as shown. 32. Fix the scanner wires to the first scanner using the front and rear wire clamps as shown (2 screws each).
Page 249: Scanner Drive Motor Removal
OPTICS 31 July 1995 2.5 SCANNER DRIVE MOTOR REMOVAL 1.5 ~ 2.0 mm A171R531.img 1. Unplug the machine. 2. Remove the ADF transport unit. 3. Remove the right cover, rear right cover, and rear upper cover. 4. Loosen the screws of the scanner wire tension bracket and slacken the wire tension.
Page 250 31 July 1995 OPTICS 2.6 LENS VERTICAL DRIVE MOTOR REMOVAL A171R562.img 1. Unplug the machine. 2. Remove the rear right cover, the left upper cover, and the exposure glass. 3. Remove the FL stabilizer board [A] (4 studs). 4. Unhook the tension spring [B] and loosen two screws [C] fixing the belt pulley bracket.
Page 251 OPTICS 31 July 1995 2.7 LENS HORIZONTAL DRIVE MOTOR REMOVAL A171R564.img 1. Remove the left upper cover and the exposure glass. 2. Remove the lens shielding cover [A] (3 screws). 3. Remove the shading plate [B] (3 screws). 4. Unhook the tension spring [C] and remove the drive wire. 5-22...
Page 252 31 July 1995 OPTICS A171R563.img 5. Remove the harness clamps [A] fixed on the motor bracket [B] (2 screws). 6. Remove the motor bracket [B] (3 screws and 2 connectors). 7. Remove the encoder sensor bracket [C] (1 screw), the encoder disc [D] (1 screw), and the drive pulley [E].
Page 253 OPTICS 31 July 1995 A171R580.img A171R579.img – Lens Horizontal Drive Wire Installation – 9. Reassemble the drive motor unit. 10. Set the bead of the drive wire to the hook [A] on the lens base and wrap the wire on the drive pulley [B] two and a half times from bottom to top clockwise.
Page 254 31 July 1995 OPTICS 2.8 MIRROR UNIT DRIVE MOTOR REMOVAL A171R582.img A171R561.img 1. Remove the left rear cover and left top cover. 2. Remove the optics shielding cover [A] (4 screws). 3. Remove the tension spring [B] and loosen the mounting screws of the belt tightener bracket [C] (2 screws).
Page 255 OPTICS 31 July 1995 2.9 6TH MIRROR UNIT REMOVAL A171R515.img A171R521.img 1. Open the front doors. 2. Remove the left inner cover. 3. Remove the connector bracket [A] (1 screw). 4. Remove the screw [B] fixing the mirror bracket and remove the 6th mirror unit [C].
Page 256 31 July 1995 OPTICS 2.10 OPTICS COOLING FAN FILTER REPLACEMENT A171R577.img A171R576.img 1. Remove the fan filter holder [A] (1 screw). 2. Replace the filter [B] in the filter holder. NOTE: Make sure that the filter is set underneath the projections [C]. 5-27...
Page 257: Development Unit Removal
DEVELOPMENT 31 July 1995 3. DEVELOPMENT 3.1 DEVELOPMENT UNIT REMOVAL A171R568.img 1. Turn off the main switch. NOTE: The development unit will start turning when it is installed in toner end or near end condition. 2. Open the front doors. 3.
Page 258 31 July 1995 DEVELOPMENT 3.2 DEVELOPMENT FILTER REPLACEMENT A171R548.img 1. Remove the development unit. 2. Remove the filter [A] by pressing the levers down as shown. 5-29...
Page 259: Developer Replacement
DEVELOPMENT 31 July 1995 3.3 DEVELOPER REPLACEMENT A171R516.img 1. Turn off the main switch. A171R545.img 2. Open the front doors and remove the left inner cover. 3. Actuate the left door safety switch using the safety switch actuator [A] fixed on the left stay of the duplex unit and close the right door. 4.
Page 260 31 July 1995 DEVELOPMENT A171R544.img 12. To make sure that all the developer has been removed, turn the collection lever clockwise again and check if any developer still falls down into the collection pan. 13. If there is still developer, repeat steps 6 to 8. Otherwise, return the collection lever.
Page 261 DEVELOPMENT 31 July 1995 3.4 SIDE SEAL REPLACEMENT A171R520.img A171R519.img A171R518.img 1. Remove the development unit. 2. Remove the entrance seal bracket [A] (2 screws). NOTE:: Do not loosen any screw with white paint [B] fixing the doctor plate. 3. Peal off the old side seals [C] and clean the parts with alcohol. 4.
Page 262 31 July 1995 DEVELOPMENT 3.5 DEVELOPMENT SLEEVE GEAR REPLACEMENT A171R569.img 1. Remove the development unit. 2. Remove two drive gears [A] for the development sleeves (1 E-ring and 1 pin each). NOTE: Take care not to lose the pins. 3. Install the new gears and reassemble the machine. NOTE: Do not use any lubricant on these gears.
Page 263 DEVELOPMENT 31 July 1995 3.6 DEVELOPMENT DUCT FILTER REPLACEMENT A171R546.img 1. Remove the development unit. 2. Remove the duct cover [A]. 3. Replace the filter [B] in the duct. 4. Reassemble the machine. 5-34...
Page 264 31 July 1995 DEVELOPMENT 3.7 DEVELOPMENT ROLLER REPLACEMENT A171R570.img A171R547.img 1. Remove the developer. 2. Remove the development unit. 3. Remove the bias terminal [A] (2 screws with star washer and 1 lead wire). 4. Remove the magnet angle levers [B] (1 screw and 1 E-ring each). NOTE: Do not loosen three screws [C] with white paint fixing the development unit guide.
Page 265 DEVELOPMENT 31 July 1995 [C] [A] A171R571.img 6. Peal off the side seals [A], [B], and [C] on the rear sleeve. 7. Remove the sleeve drive gears [D] (1 E-ring and 1 pin each). 8. Remove the idle gear [E] (1 O-ring). 9.
Page 266 31 July 1995 DEVELOPMENT 3.8 TONER NEAR END SENSOR BRACKET REMOVAL A171R549.img 1. Remove the development unit. 2. Remove the wire clamp [A] fixing the development unit harness (1 screw). 3. Slide out the toner near end sensor bracket [B] (1 screw). NOTE: When reinstalling the sensor bracket, make sure that no lead wire touches the gear [C].
Page 267: Cleaning Unit Removal
CLEANING 31 July 1995 4. CLEANING 4.1 CLEANING UNIT REMOVAL A171R599.img 1. Remove the left inner cover. 2. Remove the development unit. 3. Release the transport unit with the lever [A] and remove the drum stay [B]. 4. Remove the cleaning unit [C]. 5-38...
Page 268: Cleaning Blade Replacement
31 July 1995 CLEANING 4.2 CLEANING BLADE REPLACEMENT A171R595.img 1. Remove the cleaning unit. 2. Remove the four screws [A] fixing the cleaning blade. 3. Replace the cleaning blade [B]. 4. Confirm proper movement of the cleaning blade. 5. Assemble the machine. 5-39...
Page 269: Cleaning Brush Replacement
CLEANING 31 July 1995 4.3 CLEANING BRUSH REPLACEMENT A171R594.img 1. Remove the cleaning unit, and remove the cleaning blade. 2. Remove the front brush holder [A] (1 screw) and remove the cleaning brush [B]. NOTE: When replacing the brush, make sure that the notch [C] of the brush fits the drive boss [D].
Page 270 31 July 1995 CLEANING 4.4 CLEANING FLICK BLADE REMOVAL A171R587.img 1. Remove the cleaning unit. 2. Remove the two screws [A] securing the flick blade to the cleaning unit. 3. Remove the flick blade [B]. NOTE: When reinstalling the flick blade, make sure that the blade bracket holes are set to the projections [C] correctly as shown.
Page 271 CLEANING 31 July 1995 4.5 CLEANING FLICK ROLLER REMOVAL A171R600.img 1. Remove the cleaning unit. 2. Remove the flick blade and unhook the blade pressure spring [A]. NOTE: Do not loosen the blade pressure stopper screw [B]. 3. Remove the rear cover of the cleaning unit [C] (4 screws). 4.
Page 272 31 July 1995 CLEANING A171R597.img 5. Slide off the toner collection pipe [A] with the spring. 6. Remove the bushing bracket [B] (1 screw and 1 bushing). 7. Remove the coupling gear [C] (1 E-ring). 8. Remove the brush gear [D] and the flick roller gear [E] (1 E-ring each). 5-43...
Page 273 CLEANING 31 July 1995 A171R601.img A171R680.img 9. Take out the bushing [A], the ground terminal [B], and the flick roller holder [C]. 10. Slide the flick roller [D] out of the rear of the cleaning unit. NOTE: When reassembling the cleaning unit after maintenance, fix the bushing bracket so that the mounting screw is located in the middle of the long screw hole [E].
Page 274: Around The Drum
31 July 1995 AROUND THE DRUM 5. AROUND THE DRUM 5.1 DRUM REPLACEMENT A171R589.img A171R598.img A171R592.img CAUTION: If the drum is removed for maintenance purposes, the drum protective sleeve must be inserted. 1. Remove the left inner cover and remove the development unit. 2.
Page 275 AROUND THE DRUM 31 July 1995 A171R593.img 5. Remove the drum flange [A]. 6. Install the drum guide [B] on the drum shaft, and pull out the old drum. 7. Insert the new drum with the drum protective sleeve, then remove the drum protective sleeve.
Page 276 31 July 1995 AROUND THE DRUM 5.2 CHARGE CORONA WIRE AND CHARGE CORONA CLEANER PAD REPLACEMENT A171R590.img 1. Remove the left inner cover and take out the charge corona unit (1 connector). 2. Remove the rear end block cover [A]. 3.
Page 277 AROUND THE DRUM 31 July 1995 5.3 PTC WIRE REPLACEMENT A171R586.img 1. Open the front doors and remove the left inner cover. 2. Pull out the PTC unit. 3. Remove the front end block cover [A] and rear end block cover [B]. 4.
Page 278 31 July 1995 AROUND THE DRUM 5.4 TRANSFER AND SEPARATION CORONA WIRE AND CLEANER REPLACEMENT A171R603.img 1. Open the front doors. 2. Lower the transport unit with the lever [A]. 3. Pull out the fusing unit. 4. Remove the transport unit lever [A] (1 screw) and the middle inner cover [B] (2 screws).
Page 279 AROUND THE DRUM 31 July 1995 A171R585.img A171R596.img 6. Remove the paper guides [A]. 7. Remove the front end block cover [B] and the rear end block cover [C]. 8. Unhook the tension springs [D] and remove the corona wires [E]. 9.
Page 280 31 July 1995 AROUND THE DRUM 5.5 DRUM HEATER REPLACEMENT A171R602.img A171R607.img 1. Unplug the copier power cord. 2. Remove the drum and take out the drum guide. 3. Remove the drum heater holder [A] (3 screws and 1 bracket). 4.
Page 281 AROUND THE DRUM 31 July 1995 5.6 CORONA CURRENT AUTO ADJUSTMENT NOTE: 1. Since each corona current has been adjusted precisely at the factory using special tools, the following procedure can be performed only when a power pack is replaced. 2.
Page 282 31 July 1995 AROUND THE DRUM 7. Exit from the SP mode and reset DIP SW #3 on the reset switch PCB. 8. Check the copy quality and the paper separation function. 5-53...
Page 283 31 July 1995 6. LCT 6.1 EXTERIOR COVERS REMOVAL A171R523.wmf A171R532.img A171R522.wmf 6.1.1 Front Cover 1. Pull out the LCT tray and remove the front cover [A] (4 screws and 1 connector). 6.1.2 Upper Cover 1. Remove the LCT from the copier. 2.
Page 284 31 July 1995 6.2 TRAY UNIT REMOVAL A171R511.img A171R512.img 1. Remove the rear cover and the harness [A] (2 screws and 1 connector) from the LCT unit. 2. While releasing the tray lock lever [B], pull out the LCT. 3. Remove the 4 screws of the LCT [C] and lift the tray from the accuride rails.
Page 285 31 July 1995 6.3 PAPER FEED ROLLER, SEPARATION ROLLER, AND PICK-UP ROLLER REPLACEMENT A171R540.wmf 1. Remove the LCT from the copier and the LCT upper cover. 2. Slide off the pick-up, feed, and separation rollers [C, D, and E] (1 snap ring each).
Page 286 31 July 1995 6.4 PICK-UP SOLENOID GAP ADJUSTMENT A171R513.img Adjustment standard: 5 ± 0.3mm 1. Remove the upper cover. 2. Adjust the pick-up solenoid gap [A] (2 screws). 5-57...
Page 287 31 July 1995 6.5 PAPER END SENSOR, LOWER LIMIT SENSOR, PAPER SIZE SENSOR, AND TRAY HEATER REPLACEMENT A171R604.img A171R591.img 1. Pull out the LCT. 2. Remove the side guides grips [A] (1 knob screw each). 3. Remove the paper tray bottom plate [B] (4 screws and 1 connector [C]) 4.
Page 288: Tray Motor Replacement
31 July 1995 6.6 TRAY MOTOR REPLACEMENT A171R588.img A171R605.img 1. Remove the upper and rear covers. 2. Disconnect the 6P connector [A] of the tray motor and remove the 3 screws [B]. 3. Turn the tray motor [C] so that the connecting shafts [D] are horizontal. NOTE: Hold the tray bottom plate during the following step to prevent the bottom plate from falling down.
Page 289 31 July 1995 6.7 TRAY MOTOR TIMING TENSION ADJUSTMENT A171R606.img A171R514.img Adjustment standards: 1 ± 0.2 Kg 1. Remove the tray motor with the bracket. 2. Adjust the timing belt tension [A] (1 screw) as shown. 6.8 TRAY DRIVE CHAIN PRESSURE ADJUSTMENT 1.
Page 290 31 July 1995 6.9 LCT PAPER FEED UNIT REMOVAL A171R533.img 1. Remove the LCT from the copier. 2. Remove the upper cover (6 screws) and rear cover (2 screws). 3. Pull out the LCT while releasing the tray lock lever. 4.
Page 291 1ST, 2ND, AND 3RD TRAYS 31 July 1995 7. 1ST, 2ND, AND 3RD TRAYS 7.1 TRAY UNIT REMOVAL A171R536.img 1. Pull out the tray [A]. 2. Remove the tray fixing plate [B] (1 screws). 3. Disengage the tray unit by pressing the tray stoppers [C] inward, while pulling out and up on the tray.
Page 292 31 July 1995 1ST, 2ND, AND 3RD TRAYS 7.2 PAPER FEED ROLLER, SEPARATION ROLLER, AND PICK-UP ROLLER REPLACEMENT A171R541.wmf 1. Remove the tray. (In case of the 2nd feed station, remove the both 1st and 2nd trays.) 2. Pull out the vertical transport unit. 3.
Page 293 1ST, 2ND, AND 3RD TRAYS 31 July 1995 7.3 PICK-UP SOLENOID GAP ADJUSTMENT A171R614.img Adjustment standard: 5 ± 0.3 mm 1. Pull out the vertical transport unit. 2. Remove the paper feed unit top cover [A] (2 screws). 3. Adjust the pick-up solenoid gap [B] (2 screws). 5-64...
Page 294 31 July 1995 1ST, 2ND, AND 3RD TRAYS 7.4 PAPER END SENSOR, LOWER LIMIT SENSOR, PAPER SIZE SENSOR, AND TRAY HEATER REPLACEMENT A171R635.img A171R633.img 7.4.1 Preparation A171R634.img 1. Pull out the paper tray. 2. Remove the side guides grips [A] (2 screws each). 3.
Page 295 1ST, 2ND, AND 3RD TRAYS 31 July 1995 A171R635.img A171R633.img 7.4.3 Paper Size Sensor Replacement A171R634.img 1. Rear Guide Post 1. Remove the paper size sensors [G] (1 screw and 1 connector each) from the rear side guide post. 2. End Plate 1.
Page 296 31 July 1995 1ST, 2ND, AND 3RD TRAYS 7.5 TRAY DRIVE WIRE REPLACEMENT A171R638.img 1. Remove the paper tray. 2. Remove the following parts: a) Tray front cover (3 screws and 1 connector) b) Tray upper rear cover [A] (2 screws) c) Tray motor [B] (6 screws and 2 connectors) d) Wire tension springs [C] (front and rear) e) Wire support brackets [D] (2 screws each: front and rear)
Page 297 1ST, 2ND, AND 3RD TRAYS 31 July 1995 A171R611.img 4. Rear wire replacement a) Insert the blue bead [A] of the new wire into the slot of the drive pulley [B] and wrap the wire around the drive pulley twice clockwise. b) String the wire over all pulleys, except the tension pulley [C].
Page 298 31 July 1995 1ST, 2ND, AND 3RD TRAYS A171R612.img 5. Front wire replacement a) Insert the blue bead [A] of the new wire into the slot of the drive pulley [B] and wrap the wire around the drive pulley twice counterclockwise. b) String the wire over all pulleys, except the tension pulley [C].
Page 299 1ST, 2ND, AND 3RD TRAYS 31 July 1995 7.6 3RD TRAY PAPER SIZE CHANGE A171R534.img 1. Remove the 5 screws for side fences [A] and rear fence [B]. 2. Change the positions of these fences to the appropriate ones for required paper size.
Page 300: Paper Feed Unit Removal
31 July 1995 1ST, 2ND, AND 3RD TRAYS 7.7 PAPER FEED UNIT REMOVAL A171R535.img 1. Remove the 1st and 2nd trays (in case of the 3rd paper feed station: 3rd tray). 2. Pull out the vertical transport unit and remove the inner cover [A] (3 screws, in case of the 3rd paper feed station: 2 screws).
Page 301 REGISTRATION AND TRANSPORT 31 July 1995 8. REGISTRATION AND TRANSPORT 8.1 PAPER DUST PAN REPLACEMENT A171R620.img A171R613.img 1. Remove the development unit. 2. Remove the registration knob [A] and transport inner cover [B] (4 screws). 3. Remove the receiving plate [C] (1 screw). 4.
Page 302 31 July 1995 REGISTRATION AND TRANSPORT 8.2 RELAY TRANSPORT UNIT REMOVAL (NON BY-PASS FEED TABLE VERSION) A171R621.img 1. Remove the LCT if it is installed. 2. Remove all the by-pass feed covers. 3. Remove the transport inner cover [A] (5 screws and 1 knob). 4.
Page 303 REGISTRATION AND TRANSPORT 31 July 1995 8.3 RELAY TRANSPORT UNIT REMOVAL (BY-PASS FEED TABLE VERSION) A171R542.wmf A171R537.img 1. Remove the LCT if it is installed. 2. Remove the by-pass feed table (follow the steps from 1 to 6 of the paper feed roller, separation roller, and pick-up roller replacement of the by-pass feed tray).
Page 304 31 July 1995 REGISTRATION AND TRANSPORT 8.4 HORIZONTAL TRANSPORT UNIT REMOVAL A171R722.img CAUTION: Do not loosen the painted positioning screws [A]. 1. Remove the relay transport unit. 2. Remove the development unit and receiving plate. 3. Remove the drum. 4. Disconnect the 2 connectors [B] and remove the 1 screw [C]. 5.
Page 305 REGISTRATION AND TRANSPORT 31 July 1995 8.5 RIGHT VERTICAL TRANSPORT UNIT REMOVAL A171R636.img 1. Remove the 1st and 2nd tray units. 2. Pull out the right vertical transport unit [A]. 3. While supporting the vertical transport unit, remove the 3 screws [B]. Otherwise, it may cause the vertical transport unit fall down.
Page 306 31 July 1995 REGISTRATION AND TRANSPORT 8.6 LEFT VERTICAL TRANSPORT UNIT REMOVAL A171R524.img A171R538.wmf 1. Remove the 3rd tray unit. 2. Pull out the left vertical transport unit [A] and remove the left lower inner cover [B] (2 screws). CAUTION: Take care not to drop the left vertical transport unit in step 4.
Page 307 REGISTRATION AND TRANSPORT 31 July 1995 8.7 TRANSPORT UNIT BELTS REPLACEMENT A171R628.img A171R610.img A171R627.img 1. Remove the transport unit release lever [A] (1 screw) and middle inner cover [B] (2 screws). 2. Remove the transport unit cover [C] (2 screws) and transfer and separation corona unit [D] (1 connector).
Page 308 31 July 1995 REGISTRATION AND TRANSPORT 8.8 PICK-OFF PAWLS REMOVAL A171R528.img A171R615.img WARNING: Be careful not to cut yourself on the sharp edges of the pick-off pawls. 1. Remove the drum. 2. Remove the pick-off pawl unit [A] as shown (Pull out it and turn it counterclockwise).
Page 309: Ozone Filter Replacement
REGISTRATION AND TRANSPORT 31 July 1995 8.10 OZONE FILTER REPLACEMENT A171R616.img 1. Remove the left rear cover. 2. Remove the duct cover [A] (2 screws). 3. Replace the ozone filter [B]. 5-80...
Page 310: Image Fusing
31 July 1995 IMAGE FUSING 9. IMAGE FUSING 9.1 FUSING UNIT REMOVAL A171R525.img 1. Open the right front door, turn the fusing unit release lever [A] counterclockwise, and pull out the fusing & inverter unit [B]. 2. Turn the fusing unit release lever clockwise and remove it (1 screw). Remove the fusing cover [C] (3 screws).
Page 311 IMAGE FUSING 31 July 1995 9.2 HOT ROLLER AND PRESSURE ROLLER REPLACEMENT A171R609.img 1. Remove the fusing unit. A171R526.img 2. Remove the top fusing cover stoppers [A] (front and rear: 1 screw each) and unhook the front and rear springs. 3.
Page 312 31 July 1995 IMAGE FUSING A171R632.img A171R617.img 8. Remove the fusing exit guide plate [A] and lower fusing entrance guide plate [B] (2 screws each). 9. Remove the pressure roller [C]. 10. Remove the bushing [D] and bearing [E] (1 C-ring) from the shaft. 11.
Page 313 IMAGE FUSING 31 July 1995 9.3 OIL SUPPLY ROLLER REPLACEMENT A171R637.img A171R629.img 1. Pull out the fusing unit. 2. Remove the upper fusing entrance guide [A] (2 screws). 3. Remove the the pressure springs [B] and the bushings [C] from the cutouts, and then the oil supply roller [D].
Page 314 31 July 1995 IMAGE FUSING 9.4 HOT ROLLER STRIPPER AND PRESSURE ROLLER STRIPPER PAWL REPLACEMENT [B] [C] A171R630.img A171R618.img 9.4.1 Preparation 1. Pull out the fusing unit and remove the fusing unit release lever [A] (1 screw) and fusing cover [B] (3 screws). 2.
Page 315: Thermistor And Thermofuse Replacement
IMAGE FUSING 31 July 1995 9.5 THERMISTOR AND THERMOFUSE REPLACEMENT A171R608.img 1. Remove the top fusing cover [A]. 2. Remove the upper fusing entrance guide [B] (2 screws). 3. Remove the thermistor [C] (1 screw and 1 connector). 4. Remove the thermofuse [D] (4 screws, 3 harness clamps, and 1 connector).
Page 316 31 July 1995 IMAGE FUSING 9.6 FUSING TEMPERATURE ADJUSTMENT A171R626.img A171R625.img Adjustment Target: 195 ± 1 °C NOTE: The fusing temperature adjustment is only necessary when you have replaced the fusing thermistor. 1. Pull out the fusing unit. 2. Remove the upper fusing entrance guide. 3.
Page 317: Fusing Pressure Adjustment
IMAGE FUSING 31 July 1995 9.7 FUSING PRESSURE ADJUSTMENT A171R619.img Adjustment standards: Nip width 10 ± 0.5 mm (the difference between front and rear measurement should be less than 0.5 mm). 1. Select the fusing nip width measure mode in the SP mode. 2.
Page 318: Entrance Guide Height Adjustment
31 July 1995 IMAGE FUSING 9.8 ENTRANCE GUIDE HEIGHT ADJUSTMENT A171R527.img NOTE: Normally the entrance guide is set in the lowest position tightened by the two screws in the lowest holes. Set it in the middle position or top position if paper creasing occurs. 1.
Page 319 INVERTER & PAPER EXIT 31 July 1995 10. INVERTER & PAPER EXIT 10.1 INVERTER UNIT REMOVAL A171R631.img CAUTION: While doing the following step, take care not to drop the inverter unit. 1. Remove the fusing unit. 2. Open the inverter unit [A] and disconnect the connectors [B] as shown: 3.
Page 320 31 July 1995 INVERTER & PAPER EXIT 10.2 FUSING SENSOR AND EXIT SENSOR REPLACEMENT A171R632.img 10.2.1 Exit Sensor Replacement 1. Pull out the fusing unit. 2. Remove the exit sensor bracket [A] (1 screw). 3. Remove the exit sensor [B] (1 screw and 1 connector). 10.2.2 Fusing Sensor Replacement 1.
Page 321 INVERTER & PAPER EXIT 31 July 1995 10.3 PINCH ROLLER SOLENOID AND INVERTER SOLENOID REPLACEMENT A171R639.img 10.3.1 Pinch Roller Solenoid Replacement 1. Remove the inverter unit. 2. Remove the fixing screw [A] for the pinch roller solenoid bracket. 3. Unhook the return spring [B] for the inverter solenoid, spring [C], and solenoid spring [D].
Page 322 31 July 1995 INVERTER & PAPER EXIT 10.4 JUNCTION GATE SOLENOID REPLACEMENT A171R624.img 1. Remove the inverter unit. 2. Remove the fixing screw [A] for the junction gate solenoid bracket. 3. Unhook the solenoid spring [B]. 4. Remove the solenoid from the bracket (3 screws, 1 clamp, and 1 connector).
Page 323: Duplex Unit Removal
DUPLEX 31 July 1995 11. DUPLEX 11.1 DUPLEX UNIT REMOVAL A171R500.wmf 1. Pull out the duplex unit [A]. 2. Remove the three screws [B] of the slide rails. 3. While supporting the duplex unit, push the left side rail [C] into the main body.
Page 324: Duplex Cover Removal
31 July 1995 DUPLEX 11.2 DUPLEX COVER REMOVAL A171R501.wmf 1. Remove the duplex knob [A] (1 screw). 2. Remove the duplex cover [B] (3 screws). 5-95...
Page 325 DUPLEX 31 July 1995 11.3 SEPARATION BELT REPLACEMENT A171R502.wmf 1. Pull out the duplex unit and remove the duplex cover. 2. Remove the two gears [A] (1 snap ring [B]). 3. Remove the separation belt unit [C] (1 gear [D], 1 retaining ring [E], and 1 bushing [F]).
Page 326 31 July 1995 DUPLEX A171R503.wmf A171R509.wmf 4. Remove the guide mylar [A] (2 snap rings). 5. Remove the snap ring [B] and bushing [C]. 6. Remove the drive roller [D]. 7. Replace the three separation belts [E] as a set. NOTE: Make sure that the snap rings [F] do not touch the separation belt.
Page 327: Feed Roller Replacement
DUPLEX 31 July 1995 11.4 FEED ROLLER REPLACEMENT [E] [D] A171R504.wmf 1. Follow the steps from 1 to 2 of the separation belt replacement. NOTE: Take care not to damage the paper end sensor harness [A] and sensor [B] when removing the duplex feed guide plate [C] in step 2.
Page 328: Duplex Tray Removal
31 July 1995 DUPLEX 11.5 DUPLEX TRAY REMOVAL A171R681.wmf A171R506.wmf A171R505.wmf 1. Remove the duplex unit, place it on the flat place, and remove the duplex cover. 2. Remove the paper flatteners [B] of the jogger fences and the left bracket [A] (4 screws).
Page 329 DUPLEX 31 July 1995 A171R507.wmf NOTE: When re-installing the duplex tray, the jogger fence guides [A] should be installed as follows. Otherwise, the jogger fence guides drop from the jogger fence drive wire. 1. Move the beads [B] to the tabs [C] as shown. 2.
Page 330 31 July 1995 DUPLEX 11.6 JOGGER POSITION ADJUSTMENT A171R508.wmf NOTE: It is required to carry out the jogger position adjustment for each paper size if the size of paper used is slightly different from the standard size. 1. Move the jogger fences [A] at the A4 position. 2.
Page 331 DUPLEX 31 July 1995 11.7 DUPLEX TRAY WIRES REPLACEMENT A171R682.img 1. Follow steps 1 to 6 of the duplex tray removal. 2. Run the jogger fence drive wire [A] or end fence drive wire [B] as shown. (Wrap each wire on each motor pulley 1 and half times.) 5-102...
Page 332: Transport Belt Replacement
31 July 1995 ARDF 12. ARDF 12.1 TRANSPORT BELT REPLACEMENT A171R659.img 1. Slide the belt unit release lever [A] to the right to release the belt unit [B]. 2. Loosen the screw [C] and slide the lever [D] supporting the left transport belt unit [E].
Page 333: Separation Roller Replacement
ARDF 31 July 1995 12.2 SEPARATION ROLLER REPLACEMENT A171R660.img 1. Open the entrance cover [A]. 2. Remove the front cover [B] of the original feed unit (2 screws). 3. Remove the separation roller shaft stopper [C] (1 screw). 4. Slide out the separation roller shaft [D]. 5.
Page 334: Original Feed Unit Removal
31 July 1995 ARDF 12.3 ORIGINAL FEED UNIT REMOVAL A171R642.img A171R647.img 1. Remove the front cover [A] (2 screws) and the rear cover [B] (3 screws) of the original feed unit. 2. Remove the right rear cover of the copier (2 screws). 3.
Page 335 ARDF 31 July 1995 A171R641.img A171R661.img 4. Remove the screw [F] fixing the right ground line. 5. Disconnect the 6 connectors [G]. 6. Remove the 3 screws [H] and slide the original feed unit to the right to remove it. 5-106...
Page 336 31 July 1995 ARDF 12.4 FEED-IN MOTOR REPLACEMENT A171R662.img A171R663,img 1. Remove the original feed unit. 2. Remove the rear under cover [A] (4 screws). 3. Remove the DF main board [B] (3 screws and 8 connectors) and disconnect the 2 connectors [C] of the feed-in motor [D]. 4.
Page 337: Pick-Up Roller Replacement
ARDF 31 July 1995 12.5 PICK-UP ROLLER REPLACEMENT A171R664.img 1. Remove the rear side plate as per steps 1 to 8 of FEED-IN MOTOR REPLACEMENT procedure. 2. Remove the heart-shape cam stopper spring [A]. 3. Remove the front under cover [B] (1 screw). 4.
Page 338 31 July 1995 ARDF A171R649.img 6. Remove the E-rings [G] on the pick-up roller shafts [H]. 7. Slide the shafts [H] toward the rear of the machine. Remove the pins [I], heart-shape cam [J], one-turn disk [K], and gears [L]. 8.
Page 339 ARDF 31 July 1995 12.6 TRANSPORT BELT UNIT REMOVAL A171R665.img A171R645.img 1. Remove the screw [A] fixing the inverter cover shaft bracket [B] and remove the inverter cover [C]. 2. Remove the transport unit cover [D] (7 screws). 3. Mark the position of the tension bracket [E] and loosen the screw [F]. 4.
Page 340 31 July 1995 ARDF 12.7 RELAY ROLLER REMOVAL A171R643.img A171R652.img 1. Remove the right rear cover (2 screws). 2. Remove the 2 screws [A] fixing the bracket to the operation unit shaft [B]. 3. Remove the screw [C] fixing the ground line. Disconnect the connector [D].
Page 341 ARDF 31 July 1995 A171R666.img 7. Remove the relay roller drive pulley [M] (1 E-ring [N]) and the bushing [O]. 8. Remove the E-ring [P], relay roller drive gear [Q], the pin [R] and E-ring [S]. 9. Remove the E-ring [T] in the front of the relay roller shaft. 10.
Page 342: Friction Tab Replacement
31 July 1995 ARDF 12.8 FRICTION TAB REPLACEMENT A171R667.img A171R668.img 1. Open the entrance cover [A]. 2. Remove the screw [B] supporting the friction tab holder [C]. 3. Remove the 3 screws [D] and replace the friction tab [E]. NOTE: Install the friction tab [E] so that its edge contacts the upstand of the separation tab supporter [F].
Page 343 ARDF 31 July 1995 12.9 BELT MOTOR / INVERTER MOTOR REPLACEMENT A171R669.img 1. Remove the inverter cover and the transport unit cover. 2. Mark the position of the transport belt drive timing belt tension bracket [A] of the transport belt drive and loosen the screw [B]. 3.
Page 344: Transport Unit Removal
31 July 1995 ARDF 12.10 TRANSPORT UNIT REMOVAL A171R670.img 1. Remove the rear cover [A] of the paper feed unit (3 screws). 2. Remove the screw [B] fixing the ground line and disconnect the 6 connectors [C]. 3. Remove the upper rear cover [D] of the copier (3 screws). 4.
Page 345 ARDF 31 July 1995 12.11 JOB SEPARATION UNIT REMOVAL A171R671.img 1. Remove the upper front cover [A] (2 screws) and the lower front cover [B] (1 screw). 2. Remove the job separation H. P. sensor [C] (1 screw). 3. Remove the DF main board [D] (3 screws). 4.
Page 346: Inverter Roller Replacement
31 July 1995 ARDF 12.12 INVERTER ROLLER REPLACEMENT A171R672.img 1. Remove the inverter cover and the transport unit cover. 2. Remove the inverter entrance guide springs [A]. 3. Loosen the screw [B] which limits the inverter entrance guide [C] movement. 4.
Page 347 ARDF 31 July 1995 12.13 EXIT ROLLER REMOVAL [R] [Q] [I] [H] A171R673.img 1. Remove the inverter cover and the transport unit cover. 2. Disconnect the 4 connectors [A]. 3. Loosen the 2 screws [B], remove the 2 screws [C], and remove the transport drive unit [D].
Page 348: Sensor Replacement
31 July 1995 ARDF 12.14 SENSOR REPLACEMENT A171R674.img A171R651.img Original Sensor/Entrance Cover Sensor 1. Remove the ADF main board [A] (3 screws). 2. Remove the sensor bracket [B] (1 screw). 3. Replace the original sensor [C] and the entrance cover sensor [D] (1 screw each).
Page 349 ARDF 31 July 1995 A171R675.img Inverter Registration Sensor A171R677.img 1. Release the transport belt unit [A]. 2. Remove the sensor cover [B] (1 screw). 3. Replace the inverter registration sensor [C] (1 screw). Inverter Entrance Sensor 1. Remove the transport unit cover. 2.
Page 350 31 July 1995 ARDF A171R650.img Exit Sensor 1. Remove the transport unit cover. 2. Remove the harness guide cover [A] (1 screw). 3. Remove the sensor bracket [B] (1 screw). 4. Replace the exit sensor [C] (1 screw). 5-121...
Page 351 ARDF 31 July 1995 12.15 STOPPER POSITION ADJUSTMENT A171R679.img A171R648.img Stopper Position Adjustment 1. Remove the feed unit left cover [A] (3 screws) and the entrance upper cover [B] (2 screws). 2. Loosen the screw [C] and slide the stopper [D] to the front of the machine. 3.
Page 352: Skew Correction
31 July 1995 ARDF 12.16 SKEW CORRECTION A171R678.img A171R676.img 1. Open the front door and remove the right inner cover [A]. 2. Turn DIP SW-3 on the error reset board [B]. 3. Input "99900" using the number keys on the operation unit to access SP mode.
Page 353: Motor Speed Adjustment
ARDF 31 July 1995 12.17 MOTOR SPEED ADJUSTMENT 1. Access page 8 of "SP adjustment" as per steps 1 to 5 of the SKEW CORRECTION procedure. 2. Press ADF motor "START" on the display. The motor speed is automatically adjusted to the standard speed in the following order: Feed-in motor - Belt motor - Inverter motor - Belt motor - Inverter motor.
Page 354 31 July 1995 ARDF 6. Adjust the back side copy registration so that the distance between the right scale and the original is 0.5 to 2 mm by pressing "+" or "–" on the display. Pressing "+" shifts the original stop position to the left. Pressing "–"...
Page 355: Belt Tension Adjustment
ARDF 31 July 1995 12.20 BELT TENSION ADJUSTMENT A171R644.img A171R646.img A171R655.img A171R653.img A171R654.img 1. Remove the rear cover of the paper feed unit and adjust the belt [A] tension with the tightener [a]. Standard: 3 mm deflection at 500 ± 100 g pressure. 2.
Page 356 31 July 1995 ARDF A171R657.img A171R658.img A171R656.img 4. Remove the upper cover the transport unit and adjust the tension of the belts [D] with the motor position brackets [d] (3 screws). Standard: 3 mm deflection at 450 ± 300 g pressure. 5.
Page 357: Side-To-Side Registration Adjustment
OTHERS 31 July 1995 13. OTHERS 13.1 SIDE-TO-SIDE REGISTRATION ADJUSTMENT Adjustment standard: 0 ± 2 mm A171R640.img A171R529.img 13.1.1 1st, 2nd, 3rd and Duplex Trays 1. Adjust the side-to-side registration for the 1st, 2nd, 3rd trays and duplex tray by the SP mode. NOTE: Do not adjust the 1st, 2nd, or 3rd trays stopper [A] and duplex tray stopper [B].
Page 358 31 July 1995 OTHERS A171R539.img 13.1.2 LCT a) Copy the test chart for the LCT in the platen mode. b) Adjust the side-to-side registration by moving the tray stopper [A]. 5-129...
Page 359: Ram Clear Procedure
OTHERS 31 July 1995 13.2 RAM CLEAR PROCEDURE IMPORTANT: This procedure clears all the machine control settings and returns them to the default values. Perform the procedure only when replacing the RAM board or when the copier malfunctions due to damaged RAM data. 1.
Page 360 31 July 1995 OTHERS 13.3 PAPER FEED TIMING ADJUSTMENT Line [E] Leading Edge Leading Edge 20 mm 32 mm A171R683.wmf NOTE: This procedure is to make sure that the paper feed timing is correct. Do not change any SP mode settings when troubleshooting a paper feed problem.
Page 361 OTHERS 31 July 1995 13.4 PAPER FEED ROLLER, SEPARATION ROLLER, AND PICK-UP ROLLER REPLACEMENT OF THE BY-PASS FEED TRAY A171R542.wmf A171R543.wmf 1. Close the by-pass feed table [A] and remove the LCT if it is installed. 2. Remove the table harness cover [B] and disconnect the connector [C]. 3.
Page 362: Troubleshooting
SECTION 6 TROUBLESHOOTING...
Page 363: System Error And Service Call Conditions
31 July 1995 SYSTEM ERROR AND SERVICE CALL CONDITIONS 1. SYSTEM ERROR AND SERVICE CALL CONDITIONS A171T500.img An SC code is displayed on the CRT screen with the "System Error" message when its condition is detected by the main PCB. The operator can reset the system error condition by pressing the error reset switch [A].
Page 364 SYSTEM ERROR AND SERVICE CALL CONDITIONS 31 July 1995 SC100 - Lamp Intensity Sensor Calibration Error Definition: During process data initialization, the CPU cannot calibrate the sensor output to 3 V even with a 100% duty cycle PWM signal to the exposure lamp stabilizer.
Page 365 31 July 1995 SYSTEM ERROR AND SERVICE CALL CONDITIONS SC104 - Exposure Lamp Malfunction - Abnormal Off Definition: The main PCB cannot detect a lamp intensity sensor signal (1.0 V) during the lamp on condition for more than 0.5 seconds. Points to check: •...
Page 366 SYSTEM ERROR AND SERVICE CALL CONDITIONS 31 July 1995 SC106 - Low FL Temperature Definition: During stand-by, the main PCB detects a high resistance (> 5.6k: 10°C) of the FL thermistor for more than 15 minutes. NOTE: 1. No detection in copy mode. 2.
Page 367 31 July 1995 SYSTEM ERROR AND SERVICE CALL CONDITIONS SC124 - Scanner Home Position Sensor Abnormal Definition: The main PCB cannot detect the scanner home position sensor output change at the scanner position initialization and scanner start. Points to check •...
Page 368 SYSTEM ERROR AND SERVICE CALL CONDITIONS 31 July 1995 SC129 - Scanner Motor Overload Definition: The motor control PCB detects a large current (2 A) of the scanner drive motor power for more than 0.2 seconds. Points to check: • Mechanical interference with the scanner •...
Page 369 31 July 1995 SYSTEM ERROR AND SERVICE CALL CONDITIONS SC144 - Mirror Unit Drive Failure Definition: The motor control PCB cannot detect the mirror unit home position sensor signal or mirror unit drive encoder signal. Points to check: • Mechanical interference with the mirror unit drive •...
Page 370 SYSTEM ERROR AND SERVICE CALL CONDITIONS 31 July 1995 SC191 - ADS Adjustment Error Definition: ADS voltage cannot be adjusted to its standard value (3.0 V ± 0.5 V) during the process data initialization. NOTE: After resetting the system error condition, the ADS adjustment will be tried again.
Page 371 31 July 1995 SYSTEM ERROR AND SERVICE CALL CONDITIONS SC302 - Charge Corona Leakage Definition: The charge power pack detects charge corona leakage and sends the leak signal to the main PCB for more than 3 seconds. NOTE: The dc power, 24 V (VP) and 38 V (VFL), will be cut at the same time.
Page 372 SYSTEM ERROR AND SERVICE CALL CONDITIONS 31 July 1995 SC307 - Vd Correction Error Definition: During process control data initialization, the target Vd value cannot be achieved within the charge power pack output range. NOTE: After resetting the system error condition, Vd correction will be tried again.
Page 373 31 July 1995 SYSTEM ERROR AND SERVICE CALL CONDITIONS SC353 - Vsg Abnormal Definition: The main PCB detects a low Vsg value (V) five times in a row. NOTE: Toner supply shifts to the 7% fixed supply mode. If the Vsg returns to normal level, standard detect supply resumes.
Page 374 SYSTEM ERROR AND SERVICE CALL CONDITIONS 31 July 1995 SC391 - Toner Collection Coil Overload Definition: The main PCB detects no signal change from the toner collection coil overload sensor for more than 3 seconds. NOTE: When the system error condition is reset, the copier shows the toner end condition message on the screen, Points to check: •...
Page 375 31 July 1995 SYSTEM ERROR AND SERVICE CALL CONDITIONS SC401 - Transfer Corona Leakage Definition: The transfer corona power pack detects the transfer corona leakage and sends the leak signal to the main PCB for more than 3 seconds. NOTE: DC power, 24 V (VP) and 38 V (VFL), will be cut at the same time.
Page 376 SYSTEM ERROR AND SERVICE CALL CONDITIONS 31 July 1995 SC404 - Transfer Corona Cleaner Failure Definition: The main PCB detects a large current for the transfer corona wire cleaner motor (mechanism lock) for more than 3 seconds when the cleaner is activated.
Page 377 31 July 1995 SYSTEM ERROR AND SERVICE CALL CONDITIONS SC440 - Main Motor Overload Definition: The motor control PCB cannot maintain the motor speed within the specification for more than 1 second, or the motor control PCB detects a large current (8 A) at the main motor for more than 2 seconds. Points to check: •...
Page 378 SYSTEM ERROR AND SERVICE CALL CONDITIONS 31 July 1995 SC444 - No Drum Temperature Increase Definition: When the detected drum temperature is below 35°C, the main PCB cannot detect within 3 minutes a temperature increase of more than 1°C. NOTE: 1. The main relays will be opened in this condition. 2.
Page 379 31 July 1995 SYSTEM ERROR AND SERVICE CALL CONDITIONS SC505 - 1st Tray Drive Abnormal Definition: The main PCB cannot detect any pulses from the first tray paper volume sensor within 3 seconds after the tray up or down operation has been started. Points to check: •...
Page 380 SYSTEM ERROR AND SERVICE CALL CONDITIONS 31 July 1995 SC510 - 2nd Tray Lower Limit Sensor Failure Definition: The main PCB cannot detect the lower limit sensor signal within 20 seconds after the tray down operation has been started. Points to check: •...
Page 381 31 July 1995 SYSTEM ERROR AND SERVICE CALL CONDITIONS SC522 - Duplex Jogger Home Position Sensor Failure Definition: The main PCB cannot detect the jogger home position sensor signal within 5 seconds after the duplex mode is selected. Points to check: •...
Page 382 SYSTEM ERROR AND SERVICE CALL CONDITIONS 31 July 1995 SC542 - Low Fusing Temperature Definition: The main PCB detects a low fusing temperature (fusing lower limit temperature : 159°C/–17 169°C/–27) for more than 10 minutes. NOTE: The Service Call message will be displayed at the first detection. The main relay will be opened in this condition.
Page 383 31 July 1995 SYSTEM ERROR AND SERVICE CALL CONDITIONS SC700 - DF Feed-in Motor Overload Definition: The DF main PCB cannot detects any pulses from the feed-in motor encoder or the pick-up roller home position sensor when the motor starts turning. Points to check: •...
Page 384 SYSTEM ERROR AND SERVICE CALL CONDITIONS 31 July 1995 SC720 - Sorter By-pass Tray Gate Motor Overload Definition: The sorter main PCB cannot detect the on signal from the by-pass tray home position and gate position sensors when the by-pass tray gate motor operates.
Page 385 31 July 1995 SYSTEM ERROR AND SERVICE CALL CONDITIONS SC723 - Sorter Staple Unit and/or Grip Home Position Sensor Failure Definition: The sorter main PCB cannot detect the home position signals from the following sensors when they are actuated: Staple unit home position sensor Grip home position sensor Points to check: •...
Page 386 SYSTEM ERROR AND SERVICE CALL CONDITIONS 31 July 1995 SC743 - 2ND Sorter Staple Unit and/or Grip Home Position Sensor Failure Same as SC723 SC745 - 2ND Sorter Hammer Home Position Sensor Failure Same as SC725 SC746 - Sorter Connection Failure Definition: The copier main PCB cannot communicate with the sorter main PCB, or the sorter main PCB cannot communicate with the second sorter main PCB.
Page 387 31 July 1995 SYSTEM ERROR AND SERVICE CALL CONDITIONS SC792 - LCT Lower Limit Sensor Failure Definition: The main PCB cannot detect the lower limit sensor signal within 20 seconds after the tray down operation has been started. Points to check: •...
Page 388: Blown Fuse Table
BLOWN FUSE TABLE 31 July 1995 2. BLOWN FUSE TABLE Fuses provide current overload protection on some of the power supply lines. The following table shows the machine’s response to an open fuse. Copier DC Power Supply Board Rated Fuse No. Voltage Protect Symptom...
Page 389 NOTE:CN1 is located on the tray motor pcb. Point To Point Diagram (TB2) (A170/A171) 31 July 1995 Drum Heater NOTE:CCW=low to turn counterclockwise, tray up. C.B. (OPEN 65 CW=high to turn clockwise, tray down. CN101-7 T102-3 T102-1 CN1-4 T100 T101 (CLOSE 50 Noise Surge...

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Ricoh FT8680 Service Manual

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