Ricoh DF56 Service Manual
  1. Manuals
  2. Brands
  3. Ricoh Manuals
  4. Printer Accessories
  5. DF56
  6. Service manual
Ricoh DF56 Service Manual

Ricoh DF56 Service Manual

Auto reverse document feeder
Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual
AUTO REVERSE
DOCUMENT FEEDER
(Machine Code: A497)

Advertisement

Table of Contents
loading

Related Manuals for Ricoh DF56

Summary of Contents for Ricoh DF56

  • Page 1 AUTO REVERSE DOCUMENT FEEDER (Machine Code: A497)

  • Page 2: Specifications

    12 February 1992 SPECIFICATIONS SPECIFICATIONS Original Size: Max A3, 11" x 17" Min B6, 5 " x 8 " Original Weight: 42~128 g/m (11~34lb) -SADF. ADF 52~104 g/m (14~28lb) -SADF. ADF. ARDF Original Feed Mode: Automatic feed ADF Set: Face-up, 1st sheet on top Manual feed one by one SADF Auto Reverse Feed ARDF Original Table Capacity:...
  • Page 3 SPECIFICATIONS 10 July 1992 TABLE: WEIGHT 41 - 51 (g/m 52 - 81 82 - 104 105 - 128 SIZE 11 - 13 (lb) 14 - 22 23 - 28 29 - 34 50 sheets 30 sheets (ARDF, ADF, (ARDF, ADF, SADF) SADF) 50 sheets...

  • Page 4: Mechanical Component Layout

    MECHANICAL COMPONENT LAYOUT 12 February 1992 MECHANICAL COMPONENT LAYOUT 1. Pulse Generator Disk 6. Inverter Pawl 2. Friction Belt 7. Inverter Roller 3. Pick-up Lever 8. Transport Belt 4. Original Table 9. Pick-up Roller 5. Exit Roller 10. Feed Roller...

  • Page 5: Electrical Component Layout

    12 February 1992 ELECTRICAL COMPONENT LAY OUT ELECTRICAL COMPONENT LAY OUT 1. Original Set Sensor 9. DF Main Board 2. Registration Sensor 10. Inverter Solenoid 3. Pulse Generator Sensor 11. Feed-out Motor 4. Original Width Sensor 12. Feed-out Sensor 5. Pick-up Solenoid 13.

  • Page 6: Electrical Component Descriptions

    ELECTRICAL COMPONENT DESCRIPTIONS 12 February 1992 ELECTRICAL COMPONENT DESCRIPTIONS MOTORS NAME FUNCTION LOCATION DC servomotor that drives to the transport Belt Drive Motor belt and feed-in system (pick-up roller, feed roller, pull-out roller and relay roller). DC servomotor that drives the feed-out unit Feed-out Motor of the DF.
  • Page 7 12 February 1992 ELECTRICAL COMPONENT DESCRIPTIONS SENSORS NAME FUNCTION LOCATION Informs the main system’s CPU that Original Set originals have been placed and causes the Sensor Insert Original indicator to go out. Registration Sets original stop timing and measures Sensor original length.

  • Page 8: Basic Operation

    BASIC OPERATION 12 February 1992 BASIC OPERATION 1. One-sided Original Feed When an original is inserted into the DF, the Insert Original indicator light goes out and the DF informs the main system’s CPU that originals have been set. When the Start key is pressed, the main system’s CPU sends the feed-in signal to the DF.
  • Page 9 12 February 1992 BASIC OPERATION When the scanner reaches to the return position, the main system’s CPU sends the invert original signal to the DF CPU in order to make a copy of the front side. The original is inverted in the same way as for back side copying. 3.

  • Page 10: Original Feed

    ORIGINAL FEED 12 February 1992 ORIGINAL FEED 6.1 ORIGINAL PICK-UP After setting the originals on the original table, the originals contact the feeler [A] of the original set sensor and cause the feeler to move out of the sensor. The DF then sends the original set signal to the main system’s CPU to inform it that the DF will be used.
  • Page 11 12 February 1992 ORIGINAL FEED 6.2 ORIGINAL SEPARATION The feed roller [A] and the friction belt [B] are used to feed-in and separate the originals [C]. Only the bottom original is fed because the friction belt prevents any other originals from feeding. Original feed starts when the feed roller starts turning and advances the bottom original of the stack.

  • Page 12: Original Feed-In Mechanism

    ORIGINAL FEED 12 February 1992 6.3 ORIGINAL FEED-IN MECHANISM The belt drive motor [A] drives the pick-up roller [B], the feed roller [C], and transport belt [D] via a feed clutch and a gear train. And, the pull out roller [E] is driven by friction with the feed roller.

  • Page 13: Original Size Detection

    12 February 1992 ORIGINAL FEED 6.4 ORIGINAL SIZE DETECTION The DF determines original size (both width and length) through the use of the original width sensor [A, rear of DF], registration sensor [A, center of DF], and pulse generator sensor [B]. The original’s length is calculated by counting the number of pulses from the pulse generator [C] while the registration sensor is on.
  • Page 14 ORIGINAL FEED 12 February 1992 6.5 ORIGINAL SELECT SWITCH This document feeder has two different ways of stopping original at the correct position on the exposure glass. They are called the "thin original mode" and the "thick original mode". The mode used is determined by the original select switch [A].

  • Page 15: Original Inversion Mechanism

    12 February 1992 ORIGINAL FEED 6.6 ORIGINAL INVERSION MECHANISM The two sided originals are inverted in the feed-out unit. 1) When the Start key is pressed, the two sided original is fed into the feed-in unit, passing over the DF registration sensor [A].
  • Page 16 ORIGINAL FEED 12 February 1992 2) The original passes over the exposure glass [A] and feeds into the feed-out unit. 3) The original is directed onto the exposure glass again by the inverter pawls. The belt drive motor now reverses 85 milliseconds after the feed out sensor [B] turns on.

  • Page 17: Original Feed-Out Mechanism

    12 February 1992 ORIGINAL FEED 6.7 ORIGINAL FEED-OUT MECHANISM The exit rollers [A] are driven by inverter motor [B]. When the document feeder receives the feed out signal from the main system, the transport belt and the exit rollers start turning simultaneously. The transport belt carries the original to the inverter rollers [C] and the exit rollers take over the original feed-out.

  • Page 18: Belt Drive Motor Circuit

    30 November 1990 6.8 BELT DRIVE MOTOR CIRCUIT DF Main Board Speed CN102-1 Data Driver Driver Circuit Belt Drive Motor ON/OFF CN102-2 Forward/ Reverse CN103-1 Phase A CN103-2 Encoder Phase B CN103-3 CN103-4 A dc servomotor is used as the belt drive motor. The driver IC controls the speed of the belt drive motor.

  • Page 19: Feed-Out Motor Circuit

    30 November 1990 6.9 FEED-OUT MOTOR CIRCUIT DF Main Board CN104-A2 AC Feedback CN104-A15 Voltage Regulation CN104-B8 Motor Driver Feed-out Drive CN104-A12 High/Low Motor Circuit ON/OFF The DF CPU sends the speed data (high or low) to the driver IC and the motor drive circuit.

  • Page 20: Lift Mechanism

    LIFT MECHANISM 12 February 1992 LIFT MECHANISM When the document feeder is opened, the lift springs [D] provide enough force to ensure that the document feeder does not fall onto the exposure glass. When the document feeder is closed, points [A], [B], and [C] are aligned and no such force is provided to the document feeder.

  • Page 21: Original Misfeed Detection

    12 February 1992 ORIGINAL MISFEED SENSING ORIGINAL MISFEED DETECTION The main system’s CPU lights the original misfeed indicator if the previous original remains on the exposure glass after manual copying and DF feed is attempted. When the DF is lifted and the previous original is removed, DF copying is permitted.

  • Page 22: Two-Sided Original

    ORIGINAL MISFEED SENSING 12 February 1992 8.2 TWO-SIDED ORIGINAL Registration Sensor ON check (540 ms) OFF check (780 ms) Feed-out Sensor ON check (780 ms) OFF check (780 ms) Belt Drive Motor Forward Reverse Feed-out Motor The Original Misfeed indicator lights if the registration sensor is not actuated within 540 milliseconds after the belt drive motor starts turning (ON check), or if the registration sensor does not turn off within 780 milliseconds after the registration sensor turns on (OFF check).

  • Page 23: Installation

    12 February 1992 INSTALLATION INSTALLATION ACCESSORY CHECK Check the quantity and condition of the accessories in the box according to the following list: 1. Installation Procedure..........1 2. DF Test chart ............1 3. DF Mounting Bracket..........2 4. Panhead Screw 4 x 14 ......... 1 5.
  • Page 24 INSTALLATION 12 February 1992 INSTALLATION PROCEDURE (FT5233 series) CAUTION: Before installing the document feeder (DF), make sure that the copier is unplugged. 1. Remove the strip of tape [A] and the shipping retainer [B] (1 screw). 2. Remove the two pan head screws [C] and replace them with flat shoulder screws [D].
  • Page 25 12 February 1992 INSTALLATION 4. Adjust the height of the DF mounting bracket. 1) Set the E-plate [A] on the exposure glass as shown and measure the clearance "a" between the DF mounting bracket and the E-plate. 2) Remove the DF mounting bracket and insert the spacers [B] (0.2 mm and.
  • Page 26 INSTALLATION 12 February 1992 5. Mount the DF on the DF mounting bracket by aligning the holes in the DF and the pins [A] on the mounting bracket, then slide the DF to the left as shown. 6. Secure the DF to the DF mounting bracket [B] (4 screws with flat washer). 7.
  • Page 27 12 February 1992 INSTALLATION 9. Remove the rear cover [A] (remove 2 screws and loosen 2 screws). 10. Swing out the main control board assembly [B] (1 screw). 11. Remove the cover plate [C] from the top cover [D] with cutting pliers. 12.
  • Page 28 INSTALLATION 12 February 1992 13. Set the DF harness [A] as follows: (1) Fiber optics cable [B] — CN106 (Main control board) [C] (2) 4P connector (White) [D] — 4P connector (White/copier) [E] 14. Secure the DF harness with a plastic clamp [F] (1 screw) as shown. 15.
  • Page 29 12 February 1992 INSTALLATION 19. Remove the grip cover [A] (2 screws). 20. Adjust the height of the magnet catch on each side. Repeat the following procedure for each magnet catch: 1) Loosen the screws securing the magnet catch [B] (2 screws). 2) Close the document feeder and tighten the magnet catch screws when the rubber stopper [C] touches the exposure glass.
  • Page 30 INSTALLATION 12 February 1992 VR102 22. Remove the DF main control board cover [A] (1 screw), and confirm that the setting of DIP SW 101 [B] on the main control board is as follows: ON: 101-1 OFF: 101-2,3,4 23. Plug in the copier and turn on the main switch. 24.
  • Page 31 12 February 1992 INSTALLATION 25. Confirm the original registration in two-sided original mode as follows: NOTE: a) An original should stop pressed against the left scale [A] in DF two-sided original mode. b) The position of the original select switch does not matter. 1) Set DIP SW101 [B] on the main control board as follows: ON: 101–2, 4 OFF:101–1, 3...
  • Page 32 INSTALLATION 12 February 1992 5) If the paper has not stopped against the left scale [A], remove the left scale (2 shoulder screws). 6) Set a sheet of A4 / 8 x 11" paper [B] sideways on the exposure 1/2" glass edge as shown.
  • Page 33 12 February 1992 INSTALLATION "a" VR 103 "a" ≥ 10∼15 mm "a" ≤ 10∼15 mm 10) If the paper did not stop at the correct position ("a"=10∼15 mm), turn VR 103 [A] to correct the original stop timing. NOTE: Turning VR103 clockwise results in the original stopping later. 11) Set back DIP SW101 [B] on the main control board as follows: ON: 101-1 OFF: 101-2,3,4...

  • Page 34: Installation Procedure (Ft6750)

    30 November 1990 INSTALLATION PROCEDURE (FT6750) Warning : Before installing the DF, make sure that the copier is unplugged. 1. Remove the strip of tape [A] and the shipping retainer [B] (1 screw). 2. Remove the two pan head screws [C] and replace then with flat shoulder screws [D].
  • Page 35 30 November 1990 4. Adjust the height of the DF mounting bracket. 1) Set the E-plate [A] on the exposure glass as shown and measure the clearance "a" between the DF mounting bracket and the E-plate. 2) Remove the DF mounting bracket and insert the spacers [B]. (0.2 mm and.
  • Page 36 30 November 1990 5. Mount the DF on the DF mounting bracket by aligning the holes in the DF and the pins [A] on the mounting bracket, then slide the DF to the left as shown. 6. Secure the DF to the DF mounting bracket [B] (4 shoulder screws). 7.
  • Page 37 30 November 1990 10. Remove the copier rear top cover [A] (2 screws). 11. Remove the harness bracket cover plate [B] (1 screw). Then remove harness bracket [C] (1 screw). 12. Feed the harness [D] through the bushing [E] and the bracket hole, then secure the bushing.
  • Page 38 30 November 1990 13. Secure the harness as shown with a plastic clamp [A] (1 screw). Reinstall the harness bracket. 14. Secure the grounding wire [B] (1 grounding screw, 1 toothed washer). 15. Set the DF harness as follows: 1) Fiber optic cable - CN113 (main PCB) [C] 2) 4P connector - 4P connector (copier).
  • Page 39 30 November 1990 17. Reinstall the rear cover (2 screws). 18. Install the angle stopper [A] (2 screws), and the original table [B]. 19. Adjust the height of the magnet catch on each side. Repeat the following procedure for each magnet catch: 1) Remove the grip cover [C] (2 screws).
  • Page 40 30 November 1990 21. Remove the main PCB cover [A] (1 screw), and set DIP SW 101 on the main PCB as follows: ON: 101-1 OFF: 101-2,3,4 22. Plug in the copier and turn on the main switch. 23. Confirm the original registration as follows: 1) Make a copy of the test sheet in platen mode (A4/8 "...
  • Page 41 30 November 1990 5) Make a copy of the test sheet in DF two-sided original mode. NOTE: a) The test sheet should stop pressed against the left scale in DF two-sided original mode. b) The position of the original select switch does not matter. 6) Compare the registration of the copy in platen mode with that of DF two-sided original mode, and confirm that the difference is within 2.0 mm.

  • Page 42: Replacement And Adjustment

    REPLACEMENT AND ADJUSTMENT 12 February 1992 10. REPLACEMENT AND ADJUSTMENT 10.1 TRANSPORT BELT REMOVAL 1. Shut down the power, then remove the DF stopper [A] (2 screws) and stand the DF 90 on end. 2. Remove the inner cover [B] (2 screws), hinge [C] (1 stud screw and 3 screws), and switch cover [D] (1 screw and 1 connector) 3.

  • Page 43: Feed-In Unit Removal

    12 February 1992 REPLACEMENT AND ADJUSTMENT 10.2 FEED-IN UNIT REMOVAL 1. Remove the transfer belt unit. (See Transfer Belt Removal steps 1 - 3.) 2. Remove the motor cover [A] (3 screws). 3. Remove the paper feed unit [B] (6 screws and 8 connectors).
  • Page 44 REPLACEMENT AND ADJUSTMENT 12 February 1992 10.3 DOCUMENT SET SENSOR REPLACEMENT 1. Remove the paper feed unit. (See Paper Feed unit Removal). 2. Remove the paper feed guide [A] (2 screws). 3. Remove the document set sensor assembly [B] (1 screw and 1 connector), then remove the sensor (1 screw).

  • Page 45: Pick Up Roller Replacement

    12 February 1992 REPLACEMENT AND ADJUSTMENT 10.4 PICK UP ROLLER REPLACEMENT 1. Remove the document set sensor assembly [A] (Refer to the Document Set Sensor Replacement). 2. Remove the bushing [B] (1 E-ring), and a gear [C] (1 E-ring), then remove the pick-up roller [D] (1 E-ring).
  • Page 46 REPLACEMENT AND ADJUSTMENT 12 February 1992 10.5 FEED-IN CLUTCH REPLACEMENT 1. Remove the document set sensor assembly [A]. (Refer to the Document Set Sensor Replacement.) 2. Remove the reinforcement bracket [B] (4 screws). 3. Remove the paper feed clutch stopper [C] (1 E-ring). 4.
  • Page 47 12 February 1992 REPLACEMENT AND ADJUSTMENT 10.6 REGISTRATION SENSOR AND SIZE SENSOR REPLACEMENT 1. Remove the paper feed clutch [A]. (Refer to the Paper Feed Clutch Replacement). 2. Remove the registration sensor and size sensor assembly [B] (2 screws, 2 connectors). 3.
  • Page 48 REPLACEMENT AND ADJUSTMENT 12 February 1992 10.7 BELT DRIVE MOTOR REPLACEMENT 1. Remove the paper feed unit. (See Paper Feed Unit Removal.) 2. Remove the plastic clamp [A] (1 screw) and disconnect the 2P and the 4P connector . 3. Remove the motor assembly [B] (3 screws and 1 E-ring). 4.
  • Page 49 12 February 1992 REPLACEMENT AND ADJUSTMENT 10.8 PICK-UP SOLENOID GAP ADJUSTMENT Adjustment Standard: 0.1 ~ 0.6 mm 1. Measure the gap [A] between the pick-up roller [B] and pick-up lever [C] while pushing the solenoid bar [D]. 2. If the gap is not within specifications (0.1 to 0.6 mm), perform the following step.
  • Page 50 REPLACEMENT AND ADJUSTMENT 12 February 1992 10.9 ORIGINAL FEED ROLLER REPLACEMENT 1. Remove the paper feed unit. (See Paper Feed Unit Removal.) 2. Remove the pick-up lever [A] (2 screws and 1 bracket), plastic clamp [B] (1 screw) and a E-ring [C]. Then remove the paper feed motor assembly [D] (3 screws).

  • Page 51: Friction Belt Replacement

    12 February 1992 REPLACEMENT AND ADJUSTMENT 10.10 FRICTION BELT REPLACEMENT 1. Remove the friction belt assembly [A] (1 screw). 2. Remove the friction belt [B] (2 springs and 1 pin [C]). NOTE: Do not touch the friction belt surface.
  • Page 52 REPLACEMENT AND ADJUSTMENT 12 February 1992 10.11 FEED-OUT UNIT REMOVAL 1. Remove the motor cover [A] (4 screws). 2. Disconnect the 3 connectors [B]. 3. Remove the feed-out unit (5 screws).
  • Page 53 12 February 1992 REPLACEMENT AND ADJUSTMENT 10.12 FEED-OUT SENSOR REPLACEMENT 1. Remove the feed-out unit. (Refer to Feed-Out Unit Removal.) 2. Remove the feed-out sensor assembly [A] (1 screw and 1 connector). 3. Replace the feed-out sensor [B] (1 screw).

  • Page 54: Inverter Roller Replacement

    REPLACEMENT AND ADJUSTMENT 12 February 1992 10.13 INVERTER ROLLER REPLACEMENT 1. Remove the paper feed-out unit. (Refer to Feed-Out Unit removal.) 2. Remove the inverter guide plate [A] (1 screw and 2 springs [B]). 3. Remove the inverter motor assembly [C] (3 screws and 1 E-ring) and the timing belt [D].
  • Page 55 12 February 1992 REPLACEMENT AND ADJUSTMENT 10.14 INVERTER SOLENOID ADJUSTMENT Adjustment Standard:1.5±0.5 mm 1. Remove the feed-out unit. (Refer to Feed-Out Unit Removal.) 2. Hold down the inverter solenoid bar [A] to measure the gap [B]. 3. If the gap is not within specifications, take the following steps. 4.

  • Page 56: Main Pcb Replacement

    REPLACEMENT AND ADJUSTMENT 12 February 1992 10.15 MAIN PCB REPLACEMENT 1. Remove the main PCB cover [A] (1 screw, 1 connector). 2. Remove 3 screws to disconnect the optic fiber cable connector [B]. 3. Disconnect the connectors [C], then remove the PCB as shown. NOTE: When removing the PCB, be careful not to damage any of the components that protrude from the board.
  • Page 57 12 February 1992 REPLACEMENT AND ADJUSTMENT 10.16 DF LEADING EDGE REGISTRATION ADJUSTMENT (FT5233) 10.16.1 One-sided Original Mode VR102 1. Remove the DF main control board cover [A] (1 screw), and confirm that the setting of DIP SW 101 [B] on the main control board is as follows: ON: 101-1 OFF: 101-2,3,4 2.
  • Page 58 REPLACEMENT AND ADJUSTMENT 12 February 1992 10.16.2 Two-sided Original Mode NOTE: a) An original should stop pressed against the left scale [A] in DF two-sided original mode. b) The position of the original select switch does not matter. 1. Set DIP SW101 [B] on the main control board as follows: ON: 101–2, 4 OFF:101–1, 3 2.
  • Page 59 12 February 1992 REPLACEMENT AND ADJUSTMENT 5. If the paper has not stopped against the left scale [A], remove the left scale (2 shoulder screws). 6. Set a sheet of A4 / 8 x 11" paper [B] sideways on the exposure glass 1/2"...
  • Page 60 REPLACEMENT AND ADJUSTMENT 12 February 1992 "a" VR 103 "a" ≥ 10∼15 mm "a" ≤ 10∼15 mm 10. If the paper did not stop at the correct position ("a"=10∼15 mm), turn VR 103 [A] to correct the original stop timing. NOTE: Turning VR103 clockwise results in the original stopping later.

  • Page 61: Df Leading Edge Registration Adjustment (Ft6750)

    30 November 1990 DF LEADING EDGE REGISTRATION ADJUSTMENT (FT6750) 1. Using the DF test chart, make a copy in platen cover mode (A4/LT width). 2. Confirm that the original select switch [A] is in thin mode, then make an- other copy of the test chart in DF mode (A4/LT width). 3.
  • Page 62 12 February 1992 REPLACEMENT AND ADJUSTMENT 10.17 PAPER FEED MOTOR SPEED CHECK AND ADJUSTMENT 1. Remove the DF main PCB cover [A] (1 screw). 2. Set DIP SW101 [B] NO. 1, 2, and 4 to ON. Leave DIP SW 3 in the OFF position.

  • Page 63: Overall Machine Control

    30 November 1990 11. OVERALL MACHINE CONTROL Copier Main PCB DF Main Board Sensors Switches Solenoids Indicators Belt Drive Driver Motor Feed-out Driver Motor The DF CPU monitors the input signals from the sensors and switches, and en- ergizes the solenoids and the indicator LEDs directly. The belt drive motor and the feed-out motor are controlled by the DF CPU through their respective driver ICs.

  • Page 64: Power Distribution

    30 November 1990 12. POWER DISTRIBUTION 115V 220/240V Noise filter Transformer DF Main Board +24V +12V Regulator CN101-1 CN2-13 Power Supply CN2-10 CN101-2 Regulator The DF uses three dc power levels : + 24 volts, + 12 volts, and + 5 volts. The line voltage is applied to the power supply board of the main copier where it is stepped down and rectified to + 24 volts.
  • Page 65 10 July 1992 COMBINE 2 ORIGINALS MODE COMBINE 2 ORIGINALS MODE 13.1 OVERVIEW [Fig.1] [Fig.2] Two originals are fed onto the exposure glass at once in the combine 2 originals mode as shown in figure 1. This allows copying 2 originals onto one sheet of paper automatically either in the full size mode or in the reduction mode.

  • Page 66: Operation

    COMBINE 2 ORIGINALS MODE 10 July 1992 13.2 OPERATION [Fig. 1] 3 mm [Fig. 2] The original transport speed in the combine 2 originals mode is 203 mm/second, while the speed in DF, SADF, and ARDF modes is 810 mm/second. This is to accurately control the 2 originals’ stop position on the exposure glass.
  • Page 67 10 July 1992 COMBINE 2 ORIGINALS MODE [Fig. 3] [Fig. 4] [Figure 3] The belt drive motor starts the reverse rotation to aligne the first original against the left scale. Then the belt drive motor stops. As the feed-in clutch stays off during this operation and the pull-out rollers have one-way bearings, the second original stays where it is.
  • Page 68 COMBINE 2 ORIGINALS MODE 10 July 1992 [Fig. 5] [Figure 5] After copying of these originals is finished, the belt drive motor and the feed-out motor turn on to feed out the originals. When the leading edge of the first original is detected by the feed-out sensor [C], the feed-in clutch turns on to start feeding the first original of the next cycle.

This manual is also suitable for:

A497

Table of Contents