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Ricoh A028 Service Training Manual

Large capacity tray, finisher, printer connector unit, key counter/printer, connector bracket
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RICOH FT9101
SERVICE TRAINING MANUAL
LARGE CAPACITY TRAY
RT32
FINISHER
SR500
PRINTER CONNECTOR UNIT
PCU10
KEY COUNTER/PRINTER
CONNECTOR BRACKET
KP10
RICOH COMPANY, LTD.

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  • Page 1 RICOH FT9101 SERVICE TRAINING MANUAL LARGE CAPACITY TRAY RT32 FINISHER SR500 PRINTER CONNECTOR UNIT PCU10 KEY COUNTER/PRINTER CONNECTOR BRACKET KP10 RICOH COMPANY, LTD.

  • Page 2: Read This First

    Read This First A few simple symbols and notations are used to help you read faster and find the information you need. Before you use this guide, glance over this list of special notations and be sure you understand what they mean. NOTE Information under this heading describes helpful hints, restric- tions, and how to avoid difficulties.

  • Page 3: Overall Machine Information

    SECTION 1 OVERALL MACHINE INFORMATION...

  • Page 4: Specifications

    1 July 1994 Specifications 1. OVERALL MACHINE INFORMATION 1.1 Specifications 1.1.1 Copier Main body Configuration: Console Copy Process: Dry Electrostatic Transfer System Originals: Sheet/Book Original Size: Maximum:11" x 17", A3 Minimum: B5 Copy Paper Size: Maximum: 11" x 17", A3 Minimum: B5 Standard Copying: 16 lb ∼...
  • Page 5 Specifications 1 July 1994 Recirculating document handler Original Size: Maximum: 11" x 17", A3 Minimum: B5 Original Weight: RDH mode SADF mode Maximum 32 lb, 120 g/m 43 lb, 160 g/m Minimum 17 lb, 64 g/m 12 lb, 40 g/m Original Set Capacity: 40 sheets (A3, or 11"...
  • Page 6 1 July 1994 Specifications 1.1.3 Finisher Paper Size: Maximum: 11" x 17"/A3 Minimum: B5 sideways Paper Weight: Standard copying 60 ∼ 163 g/m Staple mode 64 ∼ 80 g/m Paper Capacity: Standard copying 2,000 sheets: " x 11"/A4 or smaller size (20 lb/80 g/m 1,000 sheets: Other sizes (20 lb/80 g/m Staple mode...

  • Page 7: Power Consumption

    Noise 1 July 1994 1.2 Noise During warm-up: 64 dB During standby: 54 dB One side copying Copier only: 65 dB Copier + ADF 70 dB Full system 71 dB Duplex copying Copier only: 67 dB Copier + ADF: 71 dB Full system: 71 dB 1.3 Power Consumption...

  • Page 8: Machine Dimensions

    1 July 1994 Machine Dimensions 1.4 Machine Dimensions 1.4.1 Copier 1,685 1,430 1,110 1.4.2 LCT...
  • Page 9 Machine Dimensions 1 July 1994 1.4.3 Finisher 1.4.4 Full system 2,610 1,240...

  • Page 10: Outline Of Mechanism

    1 July 1994 Outline of Mechanism 1.5 Outline of Mechanism 1.5.1 Main unit layout diagram The air knife separates the leading edges of the originals. The lowest original is held Fusing unit against the transport belts by the suction of Heat and pressure roller the vacuum fan and fed by the belts.
  • Page 11 Outline of Mechanism 1 July 1994 1.5.2 Paper transport process Simplex copy mode In the simplex copy mode, copies are stacked on the copy tray with the image side down as shown. In the finishing modes, copies are inverted and stacked on the shift tray in page order as shown by the dotted line.
  • Page 12 1 July 1994 Outline of Mechanism 1.5.3 Original transport process SADF mode In the SADF mode, the original is set with the image side down and transported from right to left. ADF and RDH modes There are two copy modes: sort and stack. In the stack mode copies of the same page are grouped together.
  • Page 13 Outline of Mechanism 1 July 1994 Duplex original to duplex copy or simplex copy mode In these modes, the original is set with the image side down on the original table and is transported as shown. The original is stopped on the exposure glass and the front side of the original is exposed first.
  • Page 14 1 July 1994 Outline of Mechanism Simplex originals to duplex copy mode Copy paper motion for odd originals The original motion in the RDH is just like the simplex original to simplex copy mode. In case of the other RDH and finisher systems, usually two cycles of the simplex original feeding makes one set of duplex copies.
  • Page 15 Outline of Mechanism 1 July 1994 This is because the originals copied on the front and reverse side are alternately copied due to the alternate paper feeding system. As the margin can be adjusted by changing the original flash (exposure) timing, the original stop on the exposure glass must correspond to the adjusted flash timing.
  • Page 16 1 July 1994 Outline of Mechanism Duplex original to simplex copies mode One cycle of original feeding makes one set of copies. For each original feeding, the front side image is copied and the copy is stacked in the duplex tray. Then the original is inverted in the RDH and the reverse side image is copied onto the copy from the duplex tray.
  • Page 17 Outline of Mechanism 1 July 1994 1.5.4 Alternate paper feeding timing chart *1 to *8 on the charts show the key points for understanding the alternate paper feeding. Refer to the explanation below for each key point. The timing charts are based in the following copy mode conditions: Left One: Two sets of copies are made from 10 originals in the simplex original to duplex copy mode.
  • Page 18 1 July 1994 Outline of Mechanism "Paper Feed Timing" shows the timing when each paper is fed from the LCT. The numbers correspond to the number of the original which will be copied on the front side of the paper. The chart shows only odd number because the even numbered originals are copied on the reverse side of the paper.
  • Page 19 Outline of Mechanism 1 July 1994 1.5.5 Cover sheet and chaptering modes Even in the duplex copy mode, the copy for the original which is designated as the cover and slip sheets does not enter the duplex tray. This is to enable the use of copy paper up to 163 g/m of paper weight.
  • Page 20 1 July 1994 Outline of Mechanism How the designated original is copied in the duplex original to duplex copy mode In the duplex original to duplex copy mode, although the original designated with the cover or chaptering mode is always copied on the front side of the cover or slip sheet, it is copied during the second original feeding cycle, not during the first one.
  • Page 21 Outline of Mechanism 1 July 1994 During the Last Original Feeding Cycle Normal original motion After completing the copy run, one more original feeding is done. This is to return the designated original, which had been made side down during the first original feeding cycle, into the original setting.
  • Page 22 Copy tray switch SADF size sensor Fusing exit sensor Lower duplex feed sensor board Copy tray sensor Cartridge set switch Right upper Upper duplex feed sensor board door switch Separation sensor Duplex entrance junction sensor Front door switch Eject tray sensor Front door sensor Cleaning coil sensor Duplex exit sensor...
  • Page 23 Duplex feed motor Mirror/lens motor Duplex vacuum solenoid Air knife solenoid Development motor Registration motor Duplex entrance junction solenoid Eject junction solenoid Relay 2 Relay 1 Circuit breaker Jogger motor Noise filter Power supply terminal block Back fence motor Charge wire cleaner motor Paper feed motor Right shield motor Left shield motor...
  • Page 24 Flash power cooling fan Exposure cooling fan Flash power inside blower Fusing cooling exhaust fan Flash blower Rear curl remover fan Front curl remove fan Duplex blower Rear cooling fan Vacuum fan 2nd fusing cooling blower 1st fusing cooing blower Inside and outside ozone exhaust fans Front cooling fan ID sensor blower...
  • Page 25 Thermistor Relay board Trigger transformer Xenon lamp Thremofuse CFL stabilizer Flash power supply Charge power pack Touch panel Cleaning power pack LCD display Thermofuse Operation panel control board Quenching lamp Filter circuit board DC motor drive board Timer board Interface board ADF DC power supply Main control board Paper feed DC power supply...
  • Page 26 1 July 1994 Electrical Component Layout Diagram RDH front view Exit sensor SADF exit sensor 1st transport sensor Entrance sensor 2nd reverse sensor 1st reverse sensor Inverter cover switch Recycle arm solenoid Recycle arm height sensor Recycle arm sensor 2nd transport Original set sensor sensor Registration sensor...
  • Page 27 Electrical Component Layout Diagram 1 July 1994 1.6.2 LCT Pick-up solenoid Horizontal transport entrance sensor Upper cover safety switch Transport motor Horizontal transport exit sensor Paper feed motor Paper feed magnetic clutch Back fence motor Back fence home position sensor Upper limit Paper feed sensor board overrun switch...
  • Page 28 1 July 1994 Electrical Component Layout Diagram 1.6.3 Finisher Inverter section Inverter entrance sensor Inverter 2nd sensor Inverter 3rd sensor Inverter control Inverter junction gate solenoid Stopper drive motor Inverter transport motor Stopper HP sensor DC power supply PCB Inverter front door safety switches 1-25...
  • Page 29 Electrical Component Layout Diagram 1 July 1994 Finisher section Exit unit half turn sensor Stack heigfht 2 sensor Stack height Exit unit lift Motor 1 sensor Shift tray upper limit Exit sensor switch Finisher front Finisher entrance door safety sensor switches Shift tray lift motor...
  • Page 30 1 July 1994 Drive Layout Diagram 1.7 Drive Layout Diagram 1.7.1 Copier Horizontal transport drive gear Duplex feed motor Mirror/lens motor Shield Fusing unit drive pulley motors (left, right) Toner Paper exit unit drive pulley supply motor Vertical transport drive pulley Agitator Tray (1, 2, 3) motors Main motor...
  • Page 31 Drive Layout Diagram 1 July 1994 Reverse motor Original feed magnetic clutch Original feed motor Transport motor 1-28...
  • Page 32 1 July 1994 Drive Layout Diagram Horizontal transport drive 1.7.2 LCT gear Transport motor Paper feed motor Paper feed magnetic clutch Tray motor 1-29...
  • Page 33 Drive Layout Diagram 1 July 1994 1.7.3 Finisher Inverter section Inverter transport drive belt Stopper driver motor Inverter transport motor Rear stopper drive belt Front stopper drive belt 1-30...
  • Page 34 1 July 1994 Drive Layout Diagram Finisher section Shift tray lift motor Exit drive motor Exit roller Upper transport drive belt Shift cam Lower transpoort drive belt Finisher transport drive belt Finisher transport mtor Shift motor Shift tray lift belt Stack feed-out motor Jogger drive belt...

  • Page 35: Air Flow Diagram

    Air Flow Diagram 1 July 1994 1.8 Air Flow Diagram ADF blower Exposure cooling lamp Flash blower Flash power inside blower Fusing cooling exhaust fan Rear cooling fan Rear curl remover fan 2nd fusing cooling blower Front curl remover fan 1st fusing cooling Vacuum fan blower...
  • Page 36 SECTION 2 SECTIONAL DESCRIPTIONS...

  • Page 37: Paper Feed

    1 July 1994 Paper Feed 2. SECTIONAL DESCRIPTIONS 2.1 Paper Feed 2.1.1 Main construction Structural diagram Horizontal transport unit From LCT Upper limit sensor 500 sheets Grip rollers Vertical transport roller 1st tray paper end sensor Registration 1000 sheets roller Registration sensor Paper dust...

  • Page 38: Paper Feed And Separation Mechanism

    Paper Feed 1 July 1994 Construction Paper feed Size sensing mechanism The photointerrupters detect the positions of the paper guide post and back fence. Tray up/down and paper The tray motor and wire raise and lower the paper tray. volume detection The photointerruptor detects the motor disk revolutions to determine the paper volume.
  • Page 39 1 July 1994 Paper Feed 2.1.2 Size sensing mechanism Guide post sensor The size of the paper set in the paper tray is detected by actuator shielding photointerrupters with actuators screwed to the paper guide post and the back fence. Paper guide post Back guide Sensor...
  • Page 40 Paper Feed 1 July 1994 2.1.3 Tray up/down and paper volume detection Lower limit sensor Paper volume detection actuator Front tray Rotation of the tray motor (reversible motor) on the rear drive wire of the tray, raises the paper tray lift rods fastened to the Paper volume sensor tray drive wires as shown in the figure.
  • Page 41 1 July 1994 Paper Feed 2.1.4 Paper end and set detection Paper end detecting mechanism Tray No. 1 The paper end sensor of tray 1 (a reflective photosensor) detects paper end, the tray lowers, and a display in red letters appears at the guidance display. Tray No.2 and 3 Due to the difference of the paper transportation length, the original feed timing in the ADF is faster than the...
  • Page 42 Paper Feed 1 July 1994 2.1.5 Paper feed and separation mechanism Unit configuration Paper feed motor This equipment has four paper feed units, including an Pick-up solenoid optional LCT. Paper feed units 1, 2, and 3, and the LCT, are as shown Paper feed roller in the figure.
  • Page 43 1 July 1994 Paper Feed Magnetic torque limiter The rotation of the drive shaft is transmitted to the reverse roller by the magnetic force of the magnet. The transmission force is adjusted with the position of the Inner magnet Outer magnet inner magnet.

  • Page 44: Drive Mechanism

    Paper Feed 1 July 1994 2.1.6 Transport and registration mechanism The grip roller and vertical transport roller feed paper Horizontal transport unit from the paper feed unit to the lower transport unit. The Grip roller pinch roller transports it to the registration roller. Vertical transport guide plate The registration roller corrects skew and aligns the image and the paper.

  • Page 45: Tray Lock Mechanism

    1 July 1994 Paper Feed 2.1.8 Tray lock mechanism When the feeler on the bottom plate of the tray goes to its lowest position, it pushes the lock lever. The tip of the lock lever raises so the tray can be pulled out. When the tray bottom plate is not in its lowest position, the lock lever prevents the tray from being pulled out.
  • Page 46 Paper Feed 1 July 1994 2.1.11 Paper feed operation Circuit diagram 2-10...

  • Page 47: Timing Chart

    1 July 1994 Paper Feed 2.1.12 Timing chart The conditions in effect for the chart below are as follows: • A4 size paper • 2 continuous copies • Paper feed from tray 1 • Platen cover mode Pulse conversion is: 1 pulse = 2.34 msec = 1 mm (690P) 2 1.505...
  • Page 48 Paper Feed 1 July 1994 The paper feed control board receives the paper feed signal via the fiber cable, and paper feed starts. From that point, it is controlled by the timer. The paper feed motor rotates at the predetermined timing to start feeding paper.

  • Page 49: Troubleshooting

    1 July 1994 Paper Feed 2.1.13 Error reset Problem: Paper tray up or down error at tray 1. When the tray motor rotates for about 20 seconds, no paper volume sensor signal (tries twice). Cause: Poor connection, sensor failure, broken wire, motor malfunction, or motor driver board failure. Problem: Paper tray up or down error at tray 2.

  • Page 50: Structural Diagram

    Optics 1 July 1994 2.2 Optics 2.2.1 Main construction Structural diagram Upper reflector Xenon lamp Flash blower and exposure cooling 1st mirror Lens (F=8, f=230 mm) Reflector Shield unit Lens filter 2nd mirror OPC belt Construction This machine uses a flash exposure system with a xe- Optics Lighting mechanism non lamp light source.
  • Page 51 1 July 1994 Optics 2.2.2 Lighting mechanism Exposure system Exposure thermofuse (99 This equipment employs a flash exposure system for Xenon lamp Side reflector 2 high speed processing. The lighting unit is composed of Upper reflector an xenon lamp and a curved face reflector. Side reflector Turn ON the start key.
  • Page 52 Optics 1 July 1994 4. When the main switch is turned off. 5. When the "Dis" (the flash discharge) key in service tool [5-04] "I/O test mode" is pressed. NOTE When the above two conditions happen, the flash power is discharged by the discharge circuit built-in the flash power supply unit.
  • Page 53 1 July 1994 Optics Uneven illuminance correction mechanism The exposure system ensures that light is distributed evenly on the original. Reflected light radiates to the OPC through the lens (F8, f=230 mm). The slanted Light distribution lines in the figure show light distribution. on original The lens filter ensures that light is evenly distributed on the OPC.
  • Page 54 Optics 1 July 1994 2.2.3 Magnification mechanism Housing guide 1st mirror housing Lens The mirror/lens motor powers the magnification drive, mirror drive and the worm gear and timing belt move the lens and 1st mirror guide rod mirrors. The motor is a stepping motor that can zoom in Timing belt increments of 1 percent within a range of 64% to 142%.
  • Page 55 1 July 1994 Optics Mirror position correction To change magnification, the lens shifts its imaging Housing guide position. The 1st and 2nd mirrors also shift to keep the 1st mirror image in focus. The 1st mirror is fastened to the 1st mirror housing and moves along the 1st mirror guide rod and the grooves of the housing guide.
  • Page 56 Optics 1 July 1994 2.2.4 Optical axis adjusting mechanism Guide eccentric cam The optical axis adjusting mechanism matches the angle of the 1st mirror, lens, and 2nd mirror. The following 1st mirror adjusting screws angles are adjusted: 1st mirror • Angle of the 1st mirror •...
  • Page 57 1 July 1994 Optics 2.2.5 Shield mechanism The image position made on the OPC differs by paper Timing belt size. Left and right shields control the exposure area. Left shield motor Left The shield unit has right and left shield screens that can shield be moved separately left and right by the shield motors.
  • Page 58 Optics 1 July 1994 Right shield screen The shield area of the right shield screen is determined by magnification data and paper size. Right shield screen shield area The figure on the right shows the right shield screen stop position by paper size and magnification. For 142% magnification during actual operation, the shield area becomes larger than the 100% position, but the exposure area corresponding to paper size is...
  • Page 59 1 July 1994 Optics 2.2.7 Optics operation Circuit diagram 2-23...
  • Page 60 Optics 1 July 1994 2.2.8 Flash power supply Flash timing The flash power supply is controlled by signals from the main control board, and charge voltage is varied in 32 levels with bit signals. a. Charge ON signal (CN2-4) b. Charge complete signal (CN2-6) c.

  • Page 61: Error Reset

    1 July 1994 Optics Compensation by magnification To set the value of F at full size mode: Reduction mode: 7 to 10 steps lowered from the standard step F Enlargement mode: 8 to 10 steps raised from the standard step F Compensation by process control The process control determines the standard step F of the flash output according to the measured and set V...
  • Page 62 OPC Unit 1 July 1994 2.3 OPC Unit 2.3.1 Main construction Structural diagram Cleaning roller Quenching lamp Construction Employs a OPC belt (organic photoconductor). OPC unit Photoconductor The gap between the OPC belt and OPC cleaning Backup roller mechanism brush, development rollers, or cleaning roller (PG: Photo- conductor Gap) are secured by the back-up rollers.
  • Page 63 1 July 1994 OPC Unit 2.3.2 Photoconductor The photoconductor uses a highly sensitive laminated OPC consisting of two photoconductive layers, constructed in the form of a belt. The layers consist of a Cross-section of the OPC Belt thin alloy conductive layer and a transparent base. The OPC belt has conductive portions at both edges.
  • Page 64 OPC Unit 1 July 1994 2.3.3 Backup roller mechanism Because this machine employs a photoconductor belt, the gap between the OPC and development unit, cleaning unit, or OPC cleaning brush changes due to the flexibility of the OPC belt. To cope with this problem, the OPC unit has back-up rollers at each affected position.
  • Page 65 1 July 1994 OPC Unit Development backup roller Development backup roller The development backup rollers are mounted opposite Release to each of the three development rollers. Both ends of shaft Plate each development backup roller are supported by spring bearing brackets. Release The set/release mechanism is the same as that of the cleaning backup roller.
  • Page 66 OPC Unit 1 July 1994 2.3.4 Tracking mechanism Because a belt photoconductor is used, shifting of the Tracking roller belt forward and backward cannot be avoided when it is driven. Correction is also required to minimize stress and distortion of the belt. Therefore, this machine employs an offset correction mechanism to minimize stress and distortion of the belt, and to prevent it from Eccentric shaft...
  • Page 67 1 July 1994 OPC Unit 2.3.5 Discharge mechanism The residual charge of the OPC surface is removed from QL stabilizer Lamp cover the inside of the unit by the quenching lamp (fluorescent lamp). Since the belt is illuminated from the inside, the Quenching lamp charge is removed regardless of the influence of the Discharge...
  • Page 68 OPC Unit 1 July 1994 2.3.7 Belt tension mechanism The tension springs on the front and rear of the OPC Tracking roller tracking unit provide tension to the OPC belt. Operation of the handle, release lock, and release cam are the OPC tracking unit same as the operation of the backup roller mechanism.
  • Page 69 1 July 1994 OPC Unit 2.3.9 OPC unit operation Circuit diagram 2-33...

  • Page 70: Timing Chart

    OPC Unit 1 July 1994 2.3.10 Timing chart Operation before the copy stand-by Copy stand-by Timing 175 ° (Fusing temperature) Item Main switch Main motor 0.2 sec OPC motor OPC idling mode ID sensor mode OPC mark sensor 0.7 sec 0.7 sec 1 OPC belt rotation Quenching lamp...
  • Page 71 1 July 1994 OPC Unit Operation to make copies [Pulse] Timing 1000 1500 2000 2500 5000 Item Start key 5240 Main motor 5240 OPC motor OPC mark sensor One OPC belt cycle Belt moving to front Belt moving to the rear Rear edge sensor Front edge sensor Tracking motor...
  • Page 72 OPC Unit 1 July 1994 2.3.11 Error reset Problem: The OPC home mark sensor stays on longer than normal. The OPC home mark, which should be 6 mm in the forward direction, is detected as 20 mm or more. Cause: Defective OPC belt, defective OPC sensor, or there is a flaw related to the OPC home mark.
  • Page 73 1 July 1994 OPC Charge 2.4 OPC Charge 2.4.1 Main construction Structural diagram Charge wire cleaner Grid wires Charge corona wires Screw shaft Cleaner motor Grid terminal Casing Charge corona terminal Construction OPC charge Charging mechanism A Scorotron type charge unit with the charge and grid wires.

  • Page 74: Charging Mechanism

    OPC Charge 1 July 1994 2.4.2 Charging mechanism The Scorotron system is employed to supply a uniform Charge corona wires surface charge to the photoconductor. The charge system is composed of looped charge corona wires and grid wires (see illustration). Charge power pack Output from the charge power pack goes to the charge...
  • Page 75 1 July 1994 OPC Charge 2.4.3 Cleaner mechanism The cleaner cleans the charge wires and grid wires to prevent fluctuation in photoconductor surface potential caused by contamination. Cleaner unit The cleaner unit is set with the feed screw and can be moved to the front and rear of the unit by turning the cleaner motor.
  • Page 76 OPC Charge 1 July 1994 2.4.5 Charging operation Circuit diagram 2-40...
  • Page 77 1 July 1994 OPC Charge 2.4.6 Timing chart Operation at power on Timing Main switch ON 175°C (Fusing temperature) Copy stand-by Item Cleaner motor Main motor Charge output Grid output Ozone exhaust fan 1 Ozone exhaust fan 2 Description Switching a relay conducts normal/reverse DC motor operation of the cleaner motor.
  • Page 78 OPC Charge 1 July 1994 Just before the machine enters the copy stand-by condition, the ID sensor pattern is made and ‘ measured. The first charge is to make dummy potential on the OPC surface. The dummy charge is made using a grid voltage which is about 10 steps lower than that during copying.
  • Page 79 1 July 1994 OPC Charge 2.4.7 Error reset SC10 Problem: When a charge output leak occurs, this stops output of the charge corona and grid. When a grid output leak occurs, only the grid output stops. When a charge or grid leakage occurs the first time, the paper feed jam indicator (location A) stays ON on the display panel.

  • Page 80: Structural Diagram

    Erase 1 July 1994 2.5 Erase 2.5.1 Main construction Structural diagram Eraser Eraser Construction 186 LEDs erase unwanted areas from the electric latent Erase Erase mechanism image formed on the OPC. Eraser blower mechanism Contamination of eraser by toner is prevented by air flow. 2-44...
  • Page 81 1 July 1994 Erase 2.5.2 Erase mechanism Charge corona unit Light is sent to the charged OPC from the eraser to erase the electric charge from the non-image areas (leading and trailing edges, and both sides). The eraser consists of 186 red LEDs and it controls the width of light as accurately as possible.
  • Page 82 Erase 1 July 1994 2.5.4 Eraser operation Circuit diagram 2-46...

  • Page 83: Image Transfer And Paper Separation

    1 July 1994 Image Transfer and Paper Separation 2.6 Image Transfer and Paper Separation 2.6.1 Main construction Structural diagram Transport belt Separation Transfer and corona wire separation power pack Vacuum fan Transport unit Transfer corona wire Separation sensor Transfer entrance Guide mylar guide mylar adjusting screw...
  • Page 84 Image Transfer and Paper Separation 1 July 1994 2.6.2 Transfer and separation mechanism The transfer and separation corona unit is on the Paper transport unit. Separation corona wire The transfer entrance guide mylar at the transfer corona inlet holds the paper against the photoconductor to eliminate transfer blurring of the leading and trailing edges of the copy.
  • Page 85 1 July 1994 Image Transfer and Paper Separation 2.6.4 Transport vacuum mechanism The separated paper is held against the transport belts by the suction of the vacuums fan. The transport belts move the paper to the fusing unit. The vacuum fan is always ON when the main switch is ON.
  • Page 86 Image Transfer and Paper Separation 1 July 1994 2.6.7 Transfer/separation operation Circuit diagram 2-50...
  • Page 87 1 July 1994 Image Transfer and Paper Separation 2.6.8 Timing chart (A4 single copying in the platen cover mode) The transfer output time is longer than separation output time because the residual potential is measured for the process control. The vacuum fan continues to run for 30 minutes by a timer after the main switch is turned OFF.
  • Page 88 Cleaning 1 July 1994 2.7 Cleaning 2.7.1 Main construction Structural diagram Doctor blade Cleaning filter Cleaning carrier inlet Cleaning unit cooling fan Fusing entrance guide PCC power pack Cleaning roller Cleaning blade Air guide mylar Scavenging roller Pick-off pawls Toner shield mylar Toner collecting coil OPC belt Cleaning backup roller...

  • Page 89: Cleaning Mechanism

    1 July 1994 Cleaning 2.7.2 Pre-cleaning corona mechanism The PCC unit does two things: one is to improve cleaning efficiency and the other is to help charging. PCC power pack Positive discharge is applied to the toner on the OPC by the corona wire.
  • Page 90 Cleaning 1 July 1994 A constant current cleaning power pack is used. --20µA for the cleaning roller bias and --10µA for the scavenging roller bias are applied. The larger negative bias for the scavenging roller attracts the positively charged toner from the cleaning roller to the scavenging roller.
  • Page 91 1 July 1994 Cleaning Cleaning method Any toner remaining on the OPC receives a positive charge from the pre-cleaning corona. The toner is Cleaning bias attracted to the cleaning carrier which has a negative Cleaning roller charge. Furthermore, negative cleaning bias is applied to the cleaning roller, and the remaining toner is attracted to the carrier on the cleaning roller.
  • Page 92 Cleaning 1 July 1994 2.7.4 Cooling mechanism The cleaning unit is located near the fusing unit, and it can easily become hot from the heat of the fusing unit and by the cleaning unit’s own friction heat. The following cooling mechanisms are provided to prevent blocking of the toner caused by heat.

  • Page 93: Drive Mechanism

    1 July 1994 Cleaning 2.7.5 Drive mechanism The main motor rotates the cleaning drive unit via Joint gear Cleaning drive unit pulleys and timing belts. The drive is transmitted to the cleaning roller. The scavenging roller and toner collecting coil is turned by the gears on the front of the unit.
  • Page 94 Cleaning 1 July 1994 2.7.7 Cleaning unit operation Circuit diagram 2-58...
  • Page 95 1 July 1994 Cleaning 2.7.8 Error reset SC13 Problem: PCC leak When a PCC leak occurs the first time, the paper feed jam indicator (location A) stays ON on the display panel. (In case of a real paper jam, the indicator blinks, but it does not stays ON.) This is not connted as a paper feed jam in the logging data, but as an SC in the [3-07] screen.
  • Page 96 OPC Filming Removal 1 July 1994 2.8 OPC Filming Removal 2.8.1 Main construction Structural diagram Drive unit (main body side) Outer casing Oscillating motor OPC cleaning brush drive solenoid OPC cleaning brush Inner casing Construction A stainless steel brush is used to remove filming OPC cleaning OPC cleaning brush brush unit...
  • Page 97 1 July 1994 OPC Filming Removal 2.8.2 OPC cleaning brush mechanism When filming material sticks to the surface of the Backup roller photoconductor, the surface potential is not easily attenuated by exposure to light, and dirty background OPC drive roller copies will be made.
  • Page 98 OPC Filming Removal 1 July 1994 2.8.4 Drive mechanism The OPC cleaning motor on the drive unit drives the OPC cleaning brush. The OPC cleaning mode is done with the OPC motor speed approximately 1% that of normal copy time. The OPC cleaning brush motor has an overload sensing Gear unit circuit on the DC drive board.
  • Page 99 1 July 1994 OPC Filming Removal 2.8.6 OPC cleaning brush operation Circuit diagram DC drive board Drive solenoid Pressure solenoid Main/OPC motors drive board 2-63...
  • Page 100 OPC Filming Removal 1 July 1994 2.8.7 Timing chart 2-64...
  • Page 101 1 July 1994 Development 2.9 Development 2.9.1 Main construction Structural diagram Separator Filter ID sensor Developer inlet Toner density sensor Opening 3rd development roller Toner cartridge Backspill plate Developer auger 2nd development roller 1st development roller Small toner agitator Development backup roller Doctor blade OPC belt Main toner agitator...

  • Page 102: Development Mechanism

    Development 1 July 1994 2.9.2 Development mechanism Three development rollers are used for high-speed development. The developer from the paddle wheel is regulated at a fixed height by the doctor blade and transported from the 1st roller to the 2nd roller and on to Photoconductor the 3rd roller.

  • Page 103: Development Bias Mechanism

    1 July 1994 Development 2.9.4 Development bias mechanism The bias voltage is applied to the three rollers from the 3rd development roller development power pack to prevent a dirty background and to adjust the image density (-210V to -525V). 2nd development roller The output of the development power pack is applied to the rollers via a bearing.

  • Page 104: Toner Cartridge Replacement

    Development 1 July 1994 2.9.6 Toner near-end detection mechanism The toner near-end sensor is mounted on the side wall Small toner agitator of the toner hopper. It is a pressure sensitive sensor that detects the quantity of toner. Toner near-end sensor The external side of the pressure sensor is constantly vibrated by the internal oscillation circuit.
  • Page 105 1 July 1994 Development 2.9.9 ID sensor anti-contamination mechanism The ID sensor blower prevents the surface of the ID sensor from being contaminated. The ID sensor blower is always on after the main switch turns on, thereby keeping the sensor surface clean. ID sensor ID sensor blower 2.9.10 Bearing toner protector...
  • Page 106 Development 1 July 1994 2.9.11 Development operation Circuit diagram 2-70...
  • Page 107 1 July 1994 Development 2.9.12 Development bias control The development bias is output from a voltage regulated power pack. It is controlled by turning 10 phototransistors ON and OFF with control signals B0-B9, and the output is within the range -60 to -525V. The control signals B0-B4 are sent to output 1 (1st and 2nd development rollers), and control signals B5-B9 are sent to output 2 (3rd development roller).
  • Page 108 Development 1 July 1994 Bias control by process control The compensation value shown in the figure is added to the bias voltage based on the residual surface potential of the OPC. NOTE • The maximum compensation value is -105 volts (seven steps in the process control). So, the maximum bias voltage is -525 volts.

  • Page 109: Error Reset

    1 July 1994 Development 2.9.13 Error reset Problem: Development motor overload. When an overload of 5A or more is applied continuously to the development motor for 2 seconds. Cause: The development roller lock-up. Problem: The difference between the toner density sensor levels before and after the toner quick sup- ply mode continues for 2 minutes is 0.12 volts or less.

  • Page 110: Toner Density Control

    Toner Density Control 1 July 1994 2.10 Toner Density Control 2.10.1 Outline of toner density control Main switch ON (or at 500 copies end) Always Fundamentally, this machine uses the toner density sensor to control the amount of toner supplied to the development unit, and thus maintain a stable toner density in the development unit.
  • Page 111 1 July 1994 Toner Density Control How an ID sensor pattern is produced In the ID sensor mode, the OPC is charged at a certain potential by the charge corona unit. A 420 x 50 mm area Charge corona unit is left by erasing unwanted areas.
  • Page 112 Toner Density Control 1 July 1994 How ID sensor output is used The voltage output by the ID sensor at detection of the ID sensor pattern is V , and that at detection of the background of the OPC is V is controlled at 4.0 volts, and the V varies according to the pattern density...

  • Page 113: Toner Supply Control

    1 July 1994 Toner Density Control 2.10.3 Toner supply operation The toner density reference value (toner supply threshold 1) is determined by the ratio V , and it is compared with the toner density sensor output. If the output of the sensor is lower by 0.04 volts than the reference value during copying, the toner supply motor is turned ON.
  • Page 114 Toner Density Control 1 July 1994 Toner supply operation flow RET: return to start Toner near-end indication Start Toner near-end sensor detects a low toner? TONER NEAR-END Remaining toner permits about 2,000 additional Near-end is displayed. A4 copies. Toner supply control Start Sensor Toner supply...
  • Page 115 1 July 1994 Toner Density Control Toner cartridge replacement Start Toner end (or near-end) display? Cartridge set switch ON? (Cartridge removed?) Agitator motor OFF Cartridge Toner end Shutter 500 copies set switch OFF? (or near-end) During copying? Agitator motor ON switch ON, then or more were (Cartridge...

  • Page 116: Process Control

    Process Control 1 July 1994 2.11 Process Control 2.11.1 Outline of process control This machine has an OPC belt 1,280 mm in circumference. The belt path and the processes around the belt are as shown in the illustration above. Process control reads the OPC surface potential with an electrometer and feeds compensation signals to various units around the OPC.
  • Page 117 1 July 1994 Process Control 2.11.2 Methods of process control OPC potential detection How OPC potential is detected The potential of the black and white portions is White pattern measured by the OPC potential sensor by forming an electrostatic latent image of the potential pattern Black pattern attached to the back of the original scale beside the exposure glass.
  • Page 118 Process Control 1 July 1994 Old OPC potential curve The photoconductor is given a specified surface potential by charging. After that exposure forms a latent image corresponding to the density of the original. The surface potential after exposure varies with the surface potential curve as shown in the figure on the right.
  • Page 119 1 July 1994 Process Control Compensation in image development process VR compensation After VD and VL compensations, the surface potential curve shows almost the same slope as that of the initial OPC potential. But as the amount of charge rises equally, excessive image density occurs during image development processing.
  • Page 120 Process Control 1 July 1994 OPC stabilization before charging VPCC compensation If the surface potential before charging fluctuates, the OPC cannot have a uniform and steady potential after charging. The surface potential before charging, called VPCC, is kept constant by controlling the voltage applied to the PCC (Pre-Cleaning Corona).
  • Page 121 1 July 1994 Process Control 2.11.3 Process control flow 2-85...
  • Page 122 Process Control 1 July 1994 2.11.4 Process control timing At power ON After power is turned on and the fusing temperature reaches 175°C, the main motor turns on to feed out any sheets in the paper path of the machine if there are any. Then, the machine enters the OPC idling mode.

  • Page 123: During Copying

    1 July 1994 Process Control During copying After power is turned on, from the first to eighth copies the VL is measured (8 times). The mean value of the results is used to determine the VL compensation for the flash output. In the same way, from the 11th to 18th copies VD is measured (8 times).

  • Page 124: Troubleshooting

    Process Control 1 July 1994 2.11.5 Troubleshooting Problem Probable Cause The grid output rises. Potential sensor A contaminated by toner. The flash output rises. Potential sensor B contaminated by toner. Some OPC potentials displayed by service tool [4-01] are 994 Potential sensor does not function (no output).
  • Page 125 1 July 1994 Fusing 2.12 Fusing 2.12.1 Main construction Structural diagram Fusing exit roller Grip Pick-up pawl Fusing exit guide plate Oil blade Oil supply pad Heat insulating cover Oil sump Heater Upper oil pan Hot roller Metering blade Pressure roller Fusing entrance Right oil guide plate...

  • Page 126: Oil Supply Mechanism

    Fusing 1 July 1994 Pressure 2.12.2 Fusing pressure mechanism release screw The pressure springs press the pressure roller against Pressure Pressure spring the hot roller. The pressure adjusting screw is used to adjusting screw change how strongly the pressure lever presses against the shaft of the pressure roller.
  • Page 127 1 July 1994 Fusing 2.12.4 Cleaning mechanism A rubber cleaning blade scrapes toner and other foreign matter from the roller surface. Oil blade 2.12.5 Oil pump mechanism Oil pump Link pin disk An oil tank is provided on the lower side of the vertical transport unit to supply silicon oil to the fusing unit via a Link tube and pump.
  • Page 128 Fusing 1 July 1994 2.12.6 Fusing drive mechanism Joint gear Two timing belts transfer the rotation of the main motor Fusing exit roller Pressure roller Relay gear to the fusing unit. The main motor drives the fusing unit’s joint gear which drives the hot roller.
  • Page 129 1 July 1994 Fusing 2.12.7 Fusing operation Circuit diagram [U.S.A. version] DC motor DC Main control board Interface board drive board [European version] DC motor DC drive board Main control board Interface board 2-93...

  • Page 130: Fusing Temperature Control

    Fusing 1 July 1994 2.12.8 Fusing temperature control When the main switch is turned ON, the heater comes ON and temperature rises. When the thermistor detects a temperature of 175 C, the main motor turns on and the machine enters idling mode.
  • Page 131 1 July 1994 Duplex and Paper Exit 2.13 Duplex and Paper Exit 2.13.1 Main construction Structural diagram Duplex entrance Duplex entrance junction gate Upper duplex end junction sensor sensor Duplex delivery roller Front and rear curl remover fans Eject tray sensor Eject junction gate Eject junction...
  • Page 132 Duplex and Paper Exit 1 July 1994 2.13.2 Paper cooling mechanism Paper absorbs a lot of heat as it passes the fusing unit. If paper is stocked in the duplex or copy tray, the toner is Cooling guide plate Fusing cooling softened by the heat and paper stick together.
  • Page 133 1 July 1994 Duplex and Paper Exit 2.13.4 Duplex stacking mechanism Duplex paper delivery When curling increases due to sudden dehumidification Upper duplex delivery roller during fusing, the leading edge of the paper sticks to the Duplex paper top of the paper stack in the duplex tray, preventing delivery roller transport or causing a stacking failure.
  • Page 134 Duplex and Paper Exit 1 July 1994 2.13.5 Duplex blower mechanism Duplex blower motor In this machine, the paper floats on air to improve the Air knife control shutter reliability of duplex paper feeding. Separation is easier and damaging or soiling the leading edge of the paper is Exhaust Air knife solenoid ON prevented.
  • Page 135 1 July 1994 Duplex and Paper Exit 2.13.6 Duplex paper feed and separation Five notches are provided on the air knife casing. Air is Air flow sent from the duplex blower to the surface of the duplex tray throughout duplex paper feeding. The air flow from Reverse roller Paper air knife casing prevents double paper feed.
  • Page 136 Duplex and Paper Exit 1 July 1994 Duplex paper feed sensor Two sets of photosensor (light emitters and receivers) Upper duplex feed sensor are provided just past the duplex feed roller, similar to the paper feed tray arrangement. Reverse roller The 2nd duplex paper feed sensor stops the duplex Paper paper feed motor temporarily to maintain the amount of...
  • Page 137 1 July 1994 Duplex and Paper Exit 2.13.7 Eject junction mechanism Feed-out to Duplex entrance After transport checking by the duplex entrance junction copy tray junction sensor Feed-out sensor, the paper is sent to the eject junction gate, and Stop lever to sorter then is sent to the copy tray or sorter.
  • Page 138 Duplex and Paper Exit 1 July 1994 2.13.9 Duplex/exit operation Circuit diagram 2-102...

  • Page 139: Timing Chart

    1 July 1994 Duplex and Paper Exit 2.13.10 Timing chart Condition: One duplex copy is made in the ADF mode Duplex entrance junction gate Eject tray sensor Duplex entrance junction sensor Eject junction Fusing exit sensor sensor 1 pulse ≈ 1 mm (transport distance) = 2.34 ms Duplex paper Eject junction gate feed sensor...
  • Page 140 Duplex and Paper Exit 1 July 1994 Refer to the timing chart on the previous page as you read the following. 1 In the ADF mode, the pulse count starts at 3.5 sec- onds after the Start key ON. In the platen mode, count- ing starts from the Start key ON.
  • Page 141 1 July 1994 Duplex and Paper Exit 4 As the air knife solenoid is operated according to the number of sheets stacked when duplex stacking is completed, the number of sheets fed are counted by the duplex paper feed sensor. 5 The OFF timing of the vacuum solenoid is deter- mined 0.1 second after determining that all the paper on tray has been fed.

  • Page 142: Error Reset

    Duplex and Paper Exit 1 July 1994 7 During duplex paper feeding, transfer time from the 2nd duplex paper feed sensor turns ON to when the reg- istration sensor turns ON is measured as for like the 1st to 3rd tray paper feed. The feed motor ON timing for the 2nd time is changed.
  • Page 143 1 July 1994 2.14 ADF 2.14.1 Main construction Structure diagram Exit sensor Original guides 2nd reverse sensor Entrance sensor Recycle arm sensor Switchback roller Original stopper Recycle arm height Original set sensor Original length ADF left cover sensor sensor safety switch Original transport belt Right turn roller Exit roller...

  • Page 144: Original Setting

    1 July 1994 2.14.2 Original setting Original stopper Recycle arm sensor On this machine’s original paper feed system, the leading edge of the original is separated by the air knife and the paper is fed by the belts with air suction. The original guides move the original to the center, and the original stopper brings the leading edge of the original to the correct position.

  • Page 145: Original Size Detection

    1 July 1994 SADF When the original is set in the SADF entrance, the SADF Registration gate solenoid Entrance gate set sensor is turned ON to enter the SADF mode. At solenoid this time, even if the original is set on the stack feed table, the SADF mode is selected.
  • Page 146 1 July 1994 2.14.5 Original separation and feed Original leading edge separation Air from the ADF blower is blown through six holes in the air knife casing to the center of the original. ADF blower The blower keeps blowing air on the original tray from Air knife casing the beginning to the end of the original feeding to Shutter solenoid...
  • Page 147 1 July 1994 Air volume adjustment The volume of air for the air knife is controlled by Recycle arm height sensor changing the speed of motor rotations, according to the number of sheets stacked on the original table. There are two motor speeds. 11 sheets or more Feeler 10 sheets or less...

  • Page 148: Transport Mechanism

    1 July 1994 2.14.6 Transport mechanism Paper feed section The originals on the original table is fed by the original transport belts from the bottom sheet of the stack. The Original feed original transport belts are driven by the original feed magnetic clutch Original feed roller motor via the original feed magnetic clutch.
  • Page 149 1 July 1994 Reverse section SADF exit gate The SADF exit gate is switched by the SADF exit gate solenoid. When the solenoid is OFF, the gate plate is lowered by the force of the spring to guide the original to the reverse section.
  • Page 150 2-sided timing belt 2-sided timing belt (long) Original S3M525[60] feed Vacuum belt magnetic Original feed motor clutch S3M141[60] B40S3M354 Transport motor Feed-out roller Relay pulley (built-in an one-way clutch) S3M351[40] S3M123[80] S3M351[60] S3M150 [80] Switchback roller pulley (built-in an one-way clutch) S3M123[80] Right turn roller (built-in an one-way clutch)
  • Page 151 1 July 1994 Reverse and feed-out drive The reverse motor changes its rotation direction to reverse or feed-out originals. The rotation direction of the reverse entrance roller and switchback roller are changed. Regardless of the rotation direction of the reverse motor, the feed-out roller and reverse exit roller rotate in the direction to feed out originals.

  • Page 152: Timing Chart

    1 July 1994 2.14.8 Timing chart SADF mode Condition: Two A4 copies from an A4 original. 2-116...
  • Page 153 1 July 1994 Single-side original mode with sort/stack mode Condition: One A4 copy each from three originals. 2-117...
  • Page 154 1 July 1994 Duplex original mode with stack mode Condition: One A4 copy from one original. 2-118...
  • Page 155 1 July 1994 2.14.9 Transport timing NOTE The broken lines in the chart below show input signals from the main control board. SADF mode Original feed motor Registration gate SOL Entrance gate SOL Registration sensor Registration gate plate SADF set sensor Entrance gate plate SADF set sensor SADF exit gate...
  • Page 156 1 July 1994 2-120...
  • Page 157 1 July 1994 Single-side original mode with sort/stack mode NOTE Because all the sensors in the transport path sense original jams, they are not shown in the flow chart below. Original stopper Original width sensor 2nd original starts feeding Entrance sensor Transport sensor 1 2nd original starts feeding Transport sensor 2...
  • Page 158 1 July 1994 3rd original start Transport sensor 2 Transport sensor 1 1st original stops then starts 2nd original stops then starts Timing d Transport belt Registration sensor Timing e Timing f 2-122...
  • Page 159 1 July 1994 1st original Reverse sensor 1 2nd original Reverse sensor 2 Registration sensor 1st original (reversing) Exit sensor Next original to reverse section Original fed out are stacked Exit sensor 2-123...
  • Page 160 1 July 1994 Duplex original mode with stack mode Reverse sensor 1 Reverse sensor 2 Reverse junction gate Transport sensor 1 Transport sensor 2 Reverse junction gate 2-124...
  • Page 161 1 July 1994 Exit sensor 2-125...
  • Page 162 1 July 1994 2.14.10 ADF operation Circuit diagram 2-126...

  • Page 163: Error Reset

    1 July 1994 2.14.11 Error reset Problem: ADF original feed motor error. No pulse signal from motor for approximately 100 msec. When this occurs, the original misfeed indicator lights on the display panel. This is not re- corded as a misfeed in the logging data of the service tool, but is recorded as an SC. If this is repeated 4 times, Error reset is indicated on the display panel.

  • Page 164: Electrical Control

    Electrical Control 1 July 1994 2.15 Electrical Control 2.15.1 DC power supply unit In this unit, each DC power supply is generated from wall outlet and is supplied to each load. [U.S.A. version] [Connector Layout] [European version] [Connector Layout] 2-128...
  • Page 165 1 July 1994 Electrical Control Output Voltage (V) Main Uses Power supply for each PCB IC and operation unit PCB. Power supply for each sensor and eraser LEDs. Power supply for each sensor and operational amplifier. For operational amplifier. Power supply for each dc motor (except OPC cleaning, toner supply, and agitator motors), solenoid, relay and each power pack control line.

  • Page 166: Main Control Board

    Electrical Control 1 July 1994 2.15.2 Main control board NOTE ± Never adjust VR101. The setting is paint locked at 4 0.05V between TP115 and TP116. DIP switch table Dipswitch No. Function at ON Function at OFF Default Setting DPS101-1 Allows the use of the service tool access Disables the service tool access code which code which is entered with service tool...
  • Page 167 1 July 1994 Electrical Control TP (test pins) table Description Finisher receiving data Finisher transmission data Paper feed control receiving data ADF receiving data Paper feed control transmission data ADF transmission data Power line -12V " +24V " +12V " RMAIN Main motor standard clock pulse ROPC...
  • Page 168 Electrical Control 1 July 1994 Internal block There are two 16-bit CPU i8086s on the main control board. The sequence CPU mainly controls the image formation sequence of the OPC, while the main CPU controls the whole system. Their data are exchanged through the dual-port RAM. 1.

  • Page 169: Reset Circuit

    1 July 1994 Electrical Control Reset circuit When power is turned ON, the power ON reset signal is generated by the condenser for 60 ms after voltage raises 4.7V. The CPU starts from 0FFFF0H by raising the reset signal. When power is turned OFF, and the 5V power source drops (approximately 4.65V), the reset signal goes low (L) again and the CPU stops each I/O operation.
  • Page 170 Electrical Control 1 July 1994 2.15.4 Paper feed control board NOTE LED and DGS are for system checks. TP (test poins) table Description Clock pulse for shield screen motor reverse rotation Clock pulse for shield screen motor forward rotation Clock pulse for jogger motor Clock pulse for mirror/lens motor Clock pulse for back fence motor Clock pulse for duplex paper feed motor...
  • Page 171 1 July 1994 Electrical Control 2.15.5 Error reset Problem: Transmission error to the operation unit. A communication error. Cause: Disconnected fiber cable, disconnection, reverse setting or defective operation control board. Connection or disconnection with the power ON. Problem: Receiving error from the operation unit. A communication error. Cause: Disconnected fiber cable, disconnection, reverse setting or defective operation control board.

  • Page 172: Large Capacity Tray

    Large Capacity Tray 1 July 1994 2.16 Large Capacity Tray 2.16.1 Main construction Structural diagram Upper transport roller Transport motor Transport exit sensor Paper feed motor Transport drive belt Transport entrance sensor Tray drive chain Horizontal transport roller Grip roller Paper feed magnetic clutch Tray motor LCT control board...
  • Page 173 1 July 1994 Large Capacity Tray 2.16.2 Tray drive mechanism Raising and lowering of the LCT bottom plate is done by the tray motor, a dc servomotor. The drive train is Paper end sensor Upper limit sensor illustrated in the diagram. Tray drive chain Paper end detection Tray drive chain (rear)

  • Page 174: Paper Feed And Separation

    Large Capacity Tray 1 July 1994 Operation in detection overrun After the upper or lower overrun switch comes ON, Error reset #63 is displayed. When the main switch is turned OFF and ON, the power supply of the tray motor connects for about 1 second by the overrun control board, and the tray motor operates normally again.
  • Page 175 1 July 1994 Large Capacity Tray 2.16.4 Size detection Paper size is detected depending on which sensors of five size sensors are interrupted by the rear of the side Rear side fence Paper size decal fence. Sensor activation by size is as shown in the table below.

  • Page 176: Horizontal Transport Unit

    Large Capacity Tray 1 July 1994 2.16.6 Horizontal transport unit The horizontal transport unit transports the paper fed Horizontal transport Horizontal transport from the LCT to the vertical transport unit of the main exit sensor entrance sensor body. It is mounted on the lower portion of the duplex/exit unit of the main body.
  • Page 177 1 July 1994 Large Capacity Tray Tray positioning As in the main body tray, the stopper and positioning bracket position the tray. Stopper Positioning bracket Dehumidification The dehumidifying heater provided on the lower part of the tray prevents the paper from absorbing moisture. The heater is designed to come on when humidity ±...
  • Page 178 Large Capacity Tray 1 July 1994 2.16.9 LCT operation Circuit diagram 2-142...
  • Page 179 1 July 1994 Large Capacity Tray DC drive board DC motor DC drive board paper feed motor AC 230V 2-143...
  • Page 180 Large Capacity Tray 1 July 1994 2.16.10 Timing chart (A4 in the platen cover mode) 2.16.11 Error reset Problem: Tray motor error. The tray motor continues to rotate for 20 seconds, no encoder signal. Cause: Connector failure, sensor failure, wire break, motor failure, drive board failure, encoder error, overrun switch broke while the tray was raising and lowering.
  • Page 181 1 July 1994 Finisher 2.17 Finisher 2.17.1 Main construction Exit rollers Strucutual diagram Finisher Upper transport junction gate Stack height sensor feeler rollers Shift tray Inverter entrance rollers Shift tray positioning roller Inverter junction gate Jogger unit Inverter guide rollers Inverter guide brush roller Positioning roller...
  • Page 182 Finisher 1 July 1994 2.17.2 Basic operation Inverter When the finisher is used in the single side copy mode, copies are always guided to the inverter tray as shown by the dotted line in the above illustration. The copies are inverted then delivered to the shift tray [F] with the image side down.
  • Page 183 1 July 1994 Finisher 2.17.3 Inverter junction gate operation In the single side copy mode, if one of the finishing modes is selected, the inverter junction gate solenoid [A] is energized when the copier exit sensor (the eject junction sensor) detects the first copy. The junction gate pawls [B] are switched so that copy paper is directed into the inverter tray (downward).

  • Page 184: Shift Tray Up/Down Mechanism

    Finisher 1 July 1994 2.17.5 Paper delivery switching Depending on the selected finishing mode, the copies are directed up or down by the junction gate [A]. A two-way solenoid is used to control the junction gate. When the exit sensor of the copier is activated while in staple mode, the solenoid [B] pulls the plunger in the arrow [C] direction.
  • Page 185 1 July 1994 Finisher 2.17.7 Shift tray side to side shift mechanism In the sort/stack mode, the shift tray [A] moves side to side to stagger and separate sets of copies. The horizontal position of the shift tray is controlled by the shift motor (dc motor) [B] and the shift cam (helical cam) [C].
  • Page 186 Finisher 1 July 1994 2.17.10 Stapler The staple hammer [A] is driven by the staple motor [B] via gears [C], two eccentric cams [D], and two links [E]. After all copies are stacked in the jogger tray, the stack is held by the jogger fences. Soon after this, the staple motor starts rotating to staple the copy stack.
  • Page 187 1 July 1994 Finisher 2.17.12 Feed-out to shift tray After being stapled, the stack feed out motor [A] starts rotating. The pawl [B] on the lift belt [C] transports the set of stapled copies up, and feeds it to the shift tray. Approximately 0.6 second after the stack feed out motor starts, the motor stops for 400ms.
  • Page 188 Finisher ON (Form Copier) Exit (From Copier) 594 ms (362 ms) Inverter Entrance Sensor (332 ms) Inverter 2nd Sensor (471ms) (209 ms) Inverter 3rd 120 ms Sensor 270 ms 40 ms 40 ms High Inverter Transport 124.7 ms 100 ms Motor 96 pulses Stopper Drive...
  • Page 189 1 July 1994 Finisher To Finisher Copier Inverter [A]: Copier Exit Rollers [E]: Inverter Guide Roller (In) [B]: Inverter Entrance Sensor [F]: Inverter 3rd Sensor [C]: Inverter Entrance Rollers [G]: Inverter Guide Roller (Out) [D]: Inverter 2nd Sensor The inversion mode timing chart shows the operation of each electrical component in the inverter section of the finisher when 2 A4 copies are made in continuous operation.
  • Page 190 Finisher ON (From Copier) Shift ON (From Copier) Exit (From Copier) 325 ms Busy (From Finisher) Exit (From Finisher) Entrance Sensor Exit Sensor Shift Tray Half Turn Sensor Stack Height Sensor 1 Stack Height Sensor 2 Shift Tray Lift Motor Down 325 ms 100 ms...
  • Page 191 1 July 1994 Finisher [A]: Exit Sensor Inverter Finisher [B]: Stack Height Sensor 1, 2 [C]: Junction Gate Solenoid [D]: Entrance Sensor [E]: Jogger H.P. Solenoid [F]: Jogger Unit Entrance Sensor [G]: Stack Feed-out Belt H.P. Sensor [H]: Jogger Unit Paper Sensor The sort mode timing chart shows the operation of each electrical component in the finisher when 1 set of A4 size copies is made from 2 originals in the sort (shift tray...
  • Page 192 Finisher ON (From Copier) Staple ON (From Copier) Exit (From Copier) 230ms Busy (From Finisher) Exit (From Finisher) Stack Height Sensor 1 Shift Tray Lift Motor Down 100ms Entrance Sensor Jogger Unit Entrance Sensor Jogger Unit Paper Sensor High 20ps Transport Drive Motor Junction Gate Solenoid 500 ms...
  • Page 193 1 July 1994 Finisher The staple mode timing chart shows the operation of each electrical component in the finisher when 1 set of A4 size copies is made in the staple (1 staple upper) and RDH modes. To initiate the home position, the shift tray moves down then up.

  • Page 194: Jam Sensor

    Operation at Paper Misfeed 1 July 1994 2.18 Operation at Paper Misfeed 2.18.1 Jam sensor Eject junction Duplex entrance sensor Horizontal Inverter junction sensor transport 1st and 2nd entrance Exit entrance duplex paper Eject tray sensor sensor sensor Fusing exit sensor feed sensors sensor Inverter...
  • Page 195 1 July 1994 Operation at Paper Misfeed Types of jams This is a list of the types of jams that may occur. • Paper feed failure on the paper tray The machine stops after all previous copy paper is fed out into the copy tray, finisher shift tray, or duplex tray.

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