Ricoh C252 Service Manual
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Ricoh C252 Service Manual

Ricoh c252 mfp service manual
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C252

SERVICE MANUAL

001701MIU
RICOH GROUP COMPANIES

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Summary of Contents for Ricoh C252

  • Page 1: Service Manual

    C252 SERVICE MANUAL 001701MIU RICOH GROUP COMPANIES...
  • Page 3 ® ® RICOH GROUP COMPANIES...
  • Page 5 C252 SERVICE MANUAL 001701MIU...
  • Page 7 It is the reader's responsibility when discussing the information contained within this document to maintain a level of confidentiality that is in the best interest of Ricoh Corporation and its member companies. NO PART OF THIS DOCUMENT MAY BE REPRODUCED IN ANY FASHION AND DISTRIBUTED WITHOUT THE PRIOR PERMISSION OF RICOH CORPORATION.
  • Page 9 Ricoh Corporation. Users of this manual should be either service trained or certified by successfully completing a Ricoh Technical Training Program. Untrained uncertified users utilizing...
  • Page 11 LEGEND PRODUCT CODE COMPANY GESTETNER LANIER RICOH SAVIN C252 JP730 DOCUMENTATION HISTORY REV. NO. DATE COMMENTS 6/2003 Original Printing...

  • Page 13: Table Of Contents

    C252 TABLE OF CONTENTS INSTALLATION 1. INSTALLATION................1-1 1.1 INSTALLATION REQUIREMENTS ............1-1 1.1.1 OPTIMUM ENVIRONMENTAL CONDITION........1-1 1.1.2 ENVIRONMENTS TO AVOID............1-1 1.1.3 POWER CONNECTION ..............1-1 1.1.4 MINIMUM SPACE REQUIREMENTS..........1-2 1.1.5 DIMENSIONS ...................1-2 1.2 INSTALLATION PROCEDURE ..............1-3 1.2.1 MAIN BODY ..................1-3 1.2.2 ADDITIONAL DRUMS (OPTION) ...........1-12 1.2.3 INTERFACE BOARD (OPTION) ............1-13...
  • Page 14 4.4.2 SCANNER JAM (P JAM LOCATION INDICATOR) ......4-7 4.4.3 MASTER FEED JAM (D JAM LOCATION INDICATOR) ....4-8 4.4.4 DRUM JAM (B JAM LOCATION INDICATOR) .........4-9 4.4.5 PAPER FEED JAM (A JAM LOCATION INDICATOR +  + ) ..4-10 4.4.6 PAPER DELIVERY JAM (C JAM LOCATION INDICATOR)...4-11 C252...
  • Page 15 6.4 IMAGE PROCESSING ................6-11 6.4.1 IMAGE PROCESSING FLOW............6-11 6.5 MASTER FEED ..................6-12 6.5.1 OVERVIEW ..................6-12 6.5.2 MASTER FEED MECHANISM ............6-13 6.5.3 CLAMPER AND TENSION ROLLER MECHANISM.......6-14 6.5.4 CUTTER MECHANISM ..............6-15 6.5.5 MASTER SET COVER SENSOR ...........6-16 6.6 DRUM......................6-17 6.6.1 OVERVIEW ..................6-17 C252...
  • Page 16 6.8.2 PAPER DELIVERY UNIT DRIVE MECHANISM......6-33 6.8.3 PAPER SEPARATION FROM THE DRUM ........6-34 6.8.4 EXIT PAWL DRIVE MECHANISM..........6-35 6.9 TIMING CHART..................6-37 6.9.1 MASTER EJECT/MASTER FEED ..........6-37 6.9.2 MASTER WRAPPING ..............6-38 6.9.3 PRINTING ..................6-39 SPECIFICATIONS SPECIFICATIONS................7-1 1. GENERAL SPECIFICATIONS..............7-1 C252...

  • Page 17: Important Safety Notices

     IMPORTANT SAFETY NOTICES PREVENTION OF PHYSICAL INJURY 1. Before disassembling or assembling parts of the digital duplicator, make sure that the power cord is unplugged. 2. The wall outlet should be near the printer and easily accessible. 3. 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.
  • Page 18 Symbols This manual uses several symbols. The meaning of those symbols are as follows: See or Refer to Core tech manual  Clip ring  E-ring  Screw  Connector ...
  • Page 19 INSTALLATION PREVENTIVE MAINTENANCE REPLACEMENT AND ADJUSTMENT TROUBLESHOOTING SERVICE TABLES DETAILED DESCRIPTIONS SPECIFICATIONS...

  • Page 21: Installation

    INSTALLATION...

  • Page 23: Installation Requirements

    1. Securely connect the power cord to a power source. 2. Make sure that the wall outlet is near the machine and easily accessible. 3. Make sure the plug is firmly inserted in the outlet. 4. Avoid multi-wiring 5. Do not pinch the power cord. C252...

  • Page 24: Minimum Space Requirements

    Place the machine near a power source, providing minimum clearance as shown below. 200 mm (7.9") Rear 600 mm (23.6") Left 600 mm (23.6") Right 600 mm (23.6") Front C252I010.WMF 1.1.5 DIMENSIONS 582mm (23.0") 519 mm (20.5") 1232 mm (48.5") C252I014.WMF 663 mm (26.1") C252I013.WMF C252...

  • Page 25: Installation Procedure

    1. Master Spool ...............2 2. Paper Feed Side Pad ............2 3. Operating Instructions............1 4. NECR (Ricoh version only) ..........1 5. Model Name Plate (C252-72 and C252-92) ......1 set 6. Paper Table .................1 set 7. Paper Delivery Table ............1 set C252...
  • Page 26 Press Roller during transport. If they are not removed, paper jams or blank images may occur, due to the lack of pressure on the Press Roller and the Front Tape tape may stick to the drum screen or Press Roller. C252...
  • Page 27 INSTALLATION PROCEDURE C252I009.WMF 3. Open the right side cover, and take out the accessory bag [A]. C252I902.WMF 4. Insert both spools into a new master roll. C252I018.WMF 5. Install the master roll. C252...
  • Page 28 The arrows [A] indicate the correct position of the master leading edge. C252I020.WMF 7. Close the master making unit cover [B] using both hands until it clicks into place. 8. Close the right side cover. C252...
  • Page 29 9. Open the front door. 10. Release the ink holder lock lever [A] and pull out the ink holder [B]. 11. Insert a new ink cartridge. C252I003.WMF 12. Take the paper table and paper delivery table out of the box. C252...
  • Page 30 C252I006.WMF 14. Attach the side and end fences, as shown. ( x 3) C252...
  • Page 31 INSTALLATION PROCEDURE C252I007.WMF 15. Install the paper delivery table. ( x 2) C252I015.WMF 16. Release the paper feed side plate lock levers [A] and adjust the side plates to match the paper size. C252...
  • Page 32 17. Load paper into the paper table. 18. Shift the paper feed tray adjustment lever [A] up to the paper feeding position. C252I017.WMF 19. Adjust the side and end fences of the paper delivery table to match the paper size. C252 1-10...
  • Page 33 21. Firmly insert the power plug in the outlet. 22. Turn on the main switch. 23. Press the clear/stop key while holding down the digit 0 key, to supply ink to the drum. 24. Make some test copies. 1-11 C252...

  • Page 34: Additional Drums (Option)

    5. Leave the old master wrapped around the removed drum to protect the drum from dust and from drying. 6. Store the removed drum unit in the drum case. 7. Install the drum unit. 8. Remove the ink cartridge cap. 9. Insert the ink cartridge in the ink holder. C252 1-12...

  • Page 35: Interface Board (Option)

    3. Connect the I/F board [C] (accessories) to CN108 [D] on the MPU. ( x 2) 4. Attach the cable [E] (accessories) to the connector bracket. ( x 2) 5. Connect the connector [F] at the opposite end to the I/F board. 6. Re-install the rear cover. 1-13 C252...

  • Page 37: Preventive Maintenance

    PREVENTIVE MAINTENANCE...

  • Page 39: Maintenance Table

    Paper Feed Damp Paper Feed Roller Cloth Water or Friction Pad Alcohol Press Roller Alcohol Exit Sensor Dry Cloth Registration Sensor Dry Cloth Water or Registration Rollers Alcohol Motor Oil Paper Delivery Unit (SAE Bushings #20) Paper Feed Clutch C252...
  • Page 40 MAINTENANCE TABLE Interval Time Print Counter Note Item 5Y 150K 300K 600K 1.2M 3M Drum and Ink Supply Cloth Screen Damp In/Outside of Drum Cloth Damp Ink Nozzle Cloth Drum Clamper Water or Plate/Magnet Alcohol C252...

  • Page 41: Replacement And Adjustment

    REPLACEMENT AND ADJUSTMENT...

  • Page 43: General Caution

    Turn off the main power switch and unplug the machine before attempting any of the procedures in this section. 3.2 COVERS 3.2.1 PANEL / FRONT COVERS C252R001.WMF [A]: Panel ( x 4,  x 2) [B]: Front cover (x 6) [C]: Front door ( x 4) C252...

  • Page 44: Rear Cover

    COVERS 3.2.2 REAR COVER C252R920.WMF [A]: Rear cover ( x 5) C252...

  • Page 45: Boards

    [B] the same on the new MPU. 2) Adjust the master end sensor (!3.5.4) after installing the new MPU. 3) Adjust the ink detection (!3.9.6) after installing the new MPU. 4) Ensure that the EPROM on the MPU contains the correct firmware. C252...

  • Page 46: Psu

    C252R003.WMF • Rear cover (! 3.2.2) [A]: PSU ( x 6,  x 3) NOTE: When the PSU is replaced, the thermal head voltage returns to the default. Adjust the thermal head voltage (!3.5.3) after installing the new board. C252...

  • Page 47: Scanner

    SCANNER 3.4 SCANNER 3.4.1 COVERS C252R004.WMF [A]: Right side cover ( x 2) [B]: Scanner cover ( x 4) C252...

  • Page 48: 1St, 2Nd Feed Roller/Cis (Contact Image Sensor)

    3.4.2 1ST, 2ND FEED ROLLER / CIS (CONTACT IMAGE SENSOR) C252R038.WMF C252R005.WMF [A]: Upper cover ( x 4) [B]: Guide plate ( x 2) [C]: CIS ( x 1) [D]: 1st feed roller ( x 3) [E]: 2nd feed roller ( x 3) C252...

  • Page 49: Document Sensor

    3.4.3 DOCUMENT SENSOR C252R006.WMF [A]: Upper guide plate ( x 2) [B]: Document sensor ( x 1) 3.4.4 SCANNER MOTOR C252R007.WMF [A]: Scanner unit ( x 5,  x 3) [B]: Scanner motor ( x 2,  x 1) C252...

  • Page 50: Master Feed

    MASTER FEED 3.5 MASTER FEED 3.5.1 MASTER MAKING UNIT C252R008.WMF [A]: Master making unit ( x 2,  x 5) C252...
  • Page 51 • Master making unit (! 3.5.1) [A]: Open the platen roller unit. [B]: Thermal head upper cover ( x 2) [C]: Thermal head side cover ( x 1) C252R010.WMF • Close the platen roller unit. [D]: Thermal head ( x 2) C252...

  • Page 52: Thermal Head

    NOTE: 1) Adjust the thermal head voltage (!3.5.3) after installing the new thermal head. 2) Don’t touch the surface of the thermal head with bare hands. (If you touch it, clean the surface with alcohol.) 3) Don’t touch the terminals of the thermal head connectors with bare hands. C252 3-10...

  • Page 53: Thermal Head Voltage Adjustment

    Wait several seconds and repeat the procedure. A beeper sounds while the power is being supplied. 5. Measure the voltage, and turn VR1 on the PSU until the value is between “+0” and “-0.1” volts from the value on the thermal head decal. 3-11 C252...

  • Page 54: Master End Sensor Adjustment

    1. Place the core inside the master making unit, and close the master making cover. 2. Connect the power plug, and turn on the main switch. 3. Access SP6-41. C252R039.WMF 4. Turn VR102 [A] on the MPU board until the display is 2.0 ± 0.1 volts. C252 3-12...

  • Page 55: Master Eject

    [C]: Master eject unit ( x 2,  x 3) 3.6.2 MASTER EJECT ROLLERS C252R014.WMF • Master eject unit (!3.6.1) [A]: Gears ( x 1) [B]: Lower master eject roller ( x 2) [C]: Upper master eject roller ( x 2, spring) 3-13 C252...

  • Page 56: Paper Feed Roller/Friction Pad

    PAPER FEED 3.7 PAPER FEED 3.7.1 PAPER FEED ROLLER / FRICTION PAD C252R015.WMF [A]: Paper feed roller unit ( x 1) [B]: Paper guide [C]: Paper feed roller ( x 1) [D]: Friction pad C252 3-14...

  • Page 57: Paper Feed Pressure Adjustment

    • When the customer is experiencing feed problems. C252R016.WMF • Front cover (! 3.2.1) Increase the feed pressure: [A] → [B] → [C] → [D] Decrease the feed pressure: [E]→ [F] → [G] → [H] Default position: [A] and [E] positions 3-15 C252...

  • Page 58: Paper Separation Pressure Adjustment

    • Move the separation pressure slider [A] to position 1 (right end). Increase the paper separation pressure: Move up the screws [B] Decrease the paper separation pressure: Move down the screws [B] Default position: lowest position For more details: See section 6.7.3 C252 3-16...

  • Page 59: Printing

    • Remove the drum [A]: Press roller ( x 1) The bearings on the rear and front differ. During installation, ensure that the bearing with the stopper [B] is positioned towards the rear of the machine. 3-17 C252...

  • Page 60: Paper Registration Roller

    3.8.2 PAPER REGISTRATION ROLLER C252R020.WMF • Remove the paper table • Front cover (! 3.2.1) • Rear cover (! 3.2.2) • MPU (! 3.3.1) [A]: Registration motor (spring,  x 3, belt  x1) [B]: Gear [C]: Bearing ( x 2) C252 3-18...
  • Page 61 PRINTING C252R021.WMF [A]: Bearing ( x 2) [B]: Slider bracket ( x 2) [C]: Plate ( x 4) [D]: Registration roller 3-19 C252...

  • Page 62: Press Roller Release Lever Adjustment

    [C] and the press roller lock lever [D] (rear side). It should be between 0.7 and 1.2 mm. 3. If it is not correct, adjust the position of the press roller lock lever after loosening the two screws [E]. 4. Repeat steps 2 and 3 for the front side. C252 3-20...

  • Page 63: Printing Pressure Adjustment

    C252R023.WMF • Paper delivery unit (! 3.10.1) 1. Adjust the distance [A] to 10 ± 0.5 mm by turning the adjusting bolt [B]. 2. Repeat the same procedure for the printing pressure spring at the non- operation side. 3-21 C252...

  • Page 64: Drum

    C252R904.WMF • Remove the drum 1. Remove the drum upper bracket ( x 4). 2. Release the stopper [A], then rotate the drum until the master clamper faces top. 3. Remove the cloth screen [B] ( x 4). C252 3-22...
  • Page 65 [C]. Adjust the stay so that it is parallel to the master clamper, then tighten the screws. • Make sure that the cloth screen is not wrinkled while spreading it around the drum. 3-23 C252...

  • Page 66: Clamper / Metal Screen

    2) Use a cloth dampened with water to clean the inside of the clamping plate [C]. Never use alcohol or other solvents, or the clamping force of the magnet will be weakened. [D]: Tape (do not lose it) [E]: Metal screen ( x 12) C252 3-24...
  • Page 67 • Position the springs [B] and [C] (one each at the front and rear) as shown when reinstalling the drum master clamper [D]. • Do not scratch the cloth screen or metal screen. 3-25 C252...

  • Page 68: Ink Pump Adjustment

    NOTE: The end of the plunger [D] should project 1mm outside from the holder [C]. C252R025.WMF 4. Check that the piston motion is smooth. 5. If the motion is stiff, loosen the pump screws [E] and adjust the pump position. 6. After tightening, repeat step 4 and step 5. C252 3-26...
  • Page 69 DRUM C252R026.WMF 7. Re-tighten the two screws [A]. 8. Check that the piston motion is smooth. 9. Reinstall the E-ring [B]. 3-27 C252...

  • Page 70: Doctor Roller Gap Adjustment

    2. If the gap is out of the standard, loosen the screw [B] and adjust the gap by turning the cam bushing [C] for the front and for the rear. NOTE: Make sure to repeat the adjustment for both ends of the rollers. C252 3-28...

  • Page 71: Ink Detection Adjustment

    Standard: 4.0 ± 0.2µs C252R037.WMF • Rear cover (!3.2.2) 1. Access SP6-40. 2. Turn VR101 [A] on the MPU board until the display is “4.0 ± 0.2u” (4.0 ± 0.2µs). NOTE: When the drum has ink inside, the machine displays “----“. 3-29 C252...

  • Page 72: Paper Delivery

    PAPER DELIVERY 3.10 PAPER DELIVERY 3.10.1 PAPER DELIVERY UNIT C252R027.WMF C252R028.WMF • Rear cover (!3.2.2) [A]: Paper delivery cover ( x 5) [B]: Paper delivery unit ( x 2,  x 2,  x 1) C252 3-30...

  • Page 73: Delivery Belt/Paper Exit Sensor

    PAPER DELIVERY 3.10.2 DELIVERY BELT / PAPER EXIT SENSOR C252R029.WMF C252R030.WMF • Remove paper delivery unit (! 3.10.1) [A]: Vacuum fan motor bracket ( x 4, x1) [B]: Delivery belts [C]: Paper exit sensor ( x 1) 3-31 C252...

  • Page 74: Vacuum Fan Motor Position

    PAPER DELIVERY 3.10.3 VACUUM FAN MOTOR POSITION C252R031.WMF • Remove the paper delivery unit (! 3.10.1) [A]: For the China model [B]: For other models C252 3-32...

  • Page 75: Exit Pawl Adjustment

    It should be 1.15 ± 0.15 mm. 3. If the clearance is not correct, adjust the clearance by turning the bolt [F]. 4. Reposition the bracket [C] and tighten the screws [A] and [B]. 5. Do the timing adjustment (see the next section). 3-33 C252...

  • Page 76: Timing Adjustment

    PAPER DELIVERY Timing adjustment Standard: 0 or less than 0.5 mm C252R022.WMF C252R034.WMF • Front cover (! 3.2.1), Rear covers (! 3.2.2) Do this after the clearance adjustment (the procedure is on the next page). C252 3-34...
  • Page 77 5. Re-tighten the two screws while pushing the cam follower against the cam face. Make sure that the gap [F] is 0 or less than 0.5 mm. NOTE: Do not push the cam followers too strongly against the cam. 6. Re-position the bracket [D] and tighten the screws [B] and [C]. 3-35 C252...

  • Page 78: Main Drive

    • PSU (!3.3.2) 1. Loosen the screws [A], [B], and [C]. 2. Move the tension roller [D] to the right with a screwdriver [E] as shown. 3. Tighten the screws [A], [B], and [C]. 4. Remove the screwdriver. C252 3-36...

  • Page 79: Main Motor Pulley Position

    MAIN DRIVE 3.11.2 MAIN MOTOR PULLEY POSITION After putting the pulley back on the main motor shaft, refer to the above illustration for the correct position of the pulley. 44.7 ± 0.1mm C252R036.WMF 3-37 C252...

  • Page 80: Firmware Update

    2. Turn off the main switch and disconnect the power plug. 3. Remove the rear cover. 4. Replace the EPROM on the MPU. 5. Connect the power plug and turn on the main switch. 6. Access SP3-1 and confirm that the suffix version was changed. C252 3-38...

  • Page 81: Troubleshooting

    TROUBLESHOOTING...

  • Page 83: Error Codes

    E-23 activate before the feed start timing sensor Feeler activates. Feed Start Timing Sensor error Master eject position sensor E-24 The feed start timing sensor does not activate Feed start timing sensor before the master eject sensor activates. Feeler C252...

  • Page 84: Electrical Component Defects

    Shorted The M indicator is lit whenever a copy is made. The C jam indicator is lit whenever the main Open switch is on. Paper Exit Sensor The B jam indicator is lit whenever a copy is Shorted made. C252...
  • Page 85 Open is no eject box. Eject Box Set Sensor Shorted The E and open cover indicators are lit. Open E-01 is displayed whenever a master is made. Cutter HP Sensor E-01 is displayed whenever the main switch is Shorted C252...

  • Page 86: Fuse, Led, Vr, Dip-Sw, And Tp Tables

    4.3.2 LED’S Main Board Function OFF: Low ink condition LED103 ON: Sufficient ink condition 4.3.3 VR’S Main Board Function VR101 Adjust the ink detection. (!3.9.6) VR102 Adjust the master end sensor. (!3.5.4) Function Adjust the thermal head voltage. (!3.5.3) C252...

  • Page 87: Test Points

    Drum Size Selection ON: LG OFF: B4 Size in Metric or Inch ON: inch OFF: mm Panel Beeper ON: Enabled OFF: Disabled Not used 1 to 4 Scanning Speed Adjustment !5.2.5 5 to 8 Master Feeding Speed Adjustment !5.2.6 C252...

  • Page 88: Jam Detection

    Compressing the used master Check Pressure Plate H.P. Sn. Pressure Plate Limit Sn. Pressure Plate Motor Master Eject C252T902.WMF Check: If the master eject sensor detects a master when the pressure plate limit sensor turns on, the E jam indicator lights. C252...

  • Page 89: Scanner Jam (P Jam Location Indicator)

    When the scanner has fed out the correct length, but the document sensor still detects the original, the P jam indicator lights. Just after turning on the main switch Check: If the document sensor detects an original, the P jam indicator lights. C252...

  • Page 90: Master Feed Jam (D Jam Location Indicator)

    Cutting Master Cutter H.P. Sn. Cutter Motor Check C252T905.WMF Check: During master cutting, if the cutter HP sensor does not turn on (the cutter does not reach home position) at the desired time, then the D jam indicator lights. C252...

  • Page 91: Drum Jam (B Jam Location Indicator)

    B jam indicator lights. Check: At the same time as check 1, if the paper exit sensor doesn’t detect the paper and the registration sensor is on, then the A and B jam indicators light. C252...

  • Page 92: Paper Feed Jam (A Jam Location Indicator +  + )

    Note that the machine also follows this pattern if the tray is empty. There is no paper end sensor; the registration sensor is used to detect paper end. Just after turning on the main switch Check: If the registration sensor detects paper, the A and B jam location indicators light. C252 4-10...

  • Page 93: Paper Delivery Jam (C Jam Location Indicator)

    When the drum has turned 273 degrees since the feed start timing sensor turns on, if the paper exit sensor detects paper, the C jam location indicator lights. Just after turning on the main switch Check: If the paper exit sensor detects paper, the C jam location indicator lights. 4-11 C252...

  • Page 95: Service Tables

    SERVICE TABLES...

  • Page 97: Service Program Mode

    1. Using the number keys, enter the desired main-menu number, then press the Enter key. 2. Using the number keys, enter the desired sub-menu number, then press the Enter key. 3. Enter the desired value using the number keys. 4. Press the enter key to store the displayed setting. C252...

  • Page 98: Main Menu No.1: Input Mode

    1-82 DIPSW 101-4 1-83 DIPSW 101-5 1-84 DIPSW 101-6 1-85 DIPSW 101-7 1-86 DIPSW 101-8 1-87 DIPSW 102-1 1-88 DIPSW 102-2 1-89 DIPSW 102-3 1-90 DIPSW 102-4 1-91 DIPSW 102-5 1-92 DIPSW 102-6 1-93 DIPSW 102-7 1-94 DIPSW 102-8 C252...

  • Page 99: Main Menu No.2: Output Mode

    5.1.4 SP2-41: THERMAL HEAD SIGNAL OUTPUT (VHD SIGNAL) Applies thermal head voltage. Power is applied by pressing the # key. To protect the thermal head, the voltage supply is automatically stopped after 30 seconds. It is also stopped by pressing the clear/stop key. "3.5.3 C252...

  • Page 100: Main Menu No.3: Test Mode

    This model has no LCD, so the suffix is displayed as shown below instead of in Latin letters. C252S900.WMF NOTE: The letters “i”, “o” and “u” are always skipped. 5.1.7 MAIN MENU NO.6: ADJUSTMENT MODE Name Function 6-40 Ink Detection Adjustment "3.9.6 6-41 Master End Sensor Adjustment "3.5.4 6-42 Image Adjustment Pattern Print "5.1.8 C252...

  • Page 101: Sp6-42: Image Adjustment Pattern Print

    • If there is an image problem during copying but the test print is OK, the problem could be in the scanner unit. The print paper should be B4 or LG size when using this test pattern. Paper Feed Direction 300 mm C252S902.WMF C252...

  • Page 102: Dip Switches

    ON: LG Drum Size Selection OFF: B4 ON: inch Size in Metric or Inch OFF: mm ON: Enabled Panel Beeper OFF: Disabled (Default) Not used 1 to 4 Scanning Speed Adjustment "5.2.5 5 to 8 Master Feeding Speed Adjustment "5.2.6 C252...

  • Page 103: Dipsw101 No.1 To 4 - Paper Registration Position

    +1.018 mm +1 pulse +0.509 mm -7 pulse -3.563 mm -6 pulse -3.054 mm -5 pulse -2.545 mm -4 pulse -2.036 mm -3 pulse -1.527 mm -2 pulse -1.018 mm -1 pulse -0.509 mm 1 pulse = 0.509 mm C252...

  • Page 104: Adjustment

    -0.68 mm -4 dots -0.34 mm +28 dots +2.38 mm +24 dots +2.04 mm +20 dots +1.7 mm +16 dots +1.36 mm +12 dots +1.02 mm +8 dots +0.68 mm +4 dots +0.34 mm 1 dot = 0.085 mm C252...

  • Page 105: Dipsw102 No.1 To 3 - Thermal Head Energy Control

    The default is -7%. This means that during printing mode, the thermal head energy is 93 % of the maximum power. This can help to increase or decrease the image density. However, do not use this SP under normal circumstances. DIPSW102-1 DIPSW102-2 DIPSW102-3 Settings -7% (Standard) -10% -15% -20% -25% C252...

  • Page 106: Dipsw103 No.1 To 4 - Scanning Speed Adjustment

    NOTE: The image position on a trial print, which is automatically made after making a master, tends to vary. Do not use the trial print when making adjustments. DIPSW103-1 DIPSW103-2 DIPSW103-3 DIPSW103-4 Difference +1.4% +1.2% +1.0% +0.8% +0.6% +0.4% +0.2% -1.4% -1.2% -1.0% -0.8% -0.6% -0.4% -0.2% C252 5-10...

  • Page 107: Dipsw103 No.5 To 8 - Master Feeding Speed

    4. If it is out of the standard, then adjust DIPSW103-5 to 103-8. ± {(300 – Value) / 300} x 100 = X.X % DIPSW103-5 DIPSW103-6 DIPSW103-7 DIPSW103-8 Difference +1.4% +1.2% +1.0% +0.8% +0.6% +0.4% +0.2% -1.4% -1.2% -1.0% -0.8% -0.6% -0.4% -0.2% 5-11 C252...

  • Page 109: Detailed Descriptions

    DETAILED DESCRIPTIONS...

  • Page 111: Detaild Section Descriptions

    6. Paper feed roller 17. Master eject rollers 7. Paper table 18. Master eject box 8. Registration rollers 19. 2nd feed rollers 9. Doctor roller 20. CIS (Contact Image Sensor) 10. Ink roller 21. 1st feed rollers 11. Press roller C252...

  • Page 112: Electrical Component Layout

    MECHANISM OVERVIEW 6.1.2 ELECTRICAL COMPONENT LAYOUT C252D943.WMF C252D944.WMF C252...
  • Page 113 Releases the press roller to apply printing Solenoid pressure. Rear Pressure Release Releases the press roller to apply printing Solenoid pressure. Counters Component Function Master Counter Keeps track of the total number of masters made. Paper Counter Keeps track of the total number of copies. C252...
  • Page 114 This sensor reads and converts the light reflected from the document into an analog video signal. Thermal Head Burns the image onto the master. Paper Feed Clutch Transmits main motor drive to the paper feed rollers at the appropriate time. C252...

  • Page 115: Drive Layout

    MECHANISM OVERVIEW 6.1.3 DRIVE LAYOUT C252D004.WMF 1. Master Eject Motor 2. Scanner Motor 3. Pressure Plate Motor 4. Clamper Motor 5. Main Motor 6. Registration Motor 7. Master Feed Motor C252...

  • Page 116: Master Eject Unit

    The pressure plate [D] then compresses the used masters in the eject box. • The capacity is 30 used masters (under normal conditions) • The master eject process is skipped when the drum master sensor [E] detects no master on the drum. C252...

  • Page 117: Master Clamper Opening Mechanism

    4) The drum guide catches the drum at the master eject position while the master clamper is being opened. When the clamper motor turns on in reverse direction to close the clamper, the drum guide also disengages the pin and the drum can turn. C252...

  • Page 118: Master Eject Roller Mechanism

    4. When the drum reaches the master feed position, the master eject and drum motors stop. The master feed position is 111 encoder pulses after the feed start timing sensor is actuated. 5. During this process, the master eject sensor [D] detects master eject jams. (!4.4.1) C252...

  • Page 119: Pressure Plate Mechanism

    [C] is actuated, then it stops. 3. If the pressure plate limit sensor is not actuated within 2.8 seconds after the pressure plate motor rotates, the Full Master Eject Box indicator lights. 4. The idle gear [E] has a clutch to prevent motor overload. C252...

  • Page 120: Scanner Unit

    3. After the master eject process is finished, the master feed motor rotates and then the scanner motor turns on. 4. The scanner motor is turned off when the original is fed 60 mm after the document sensor switches off. C252 6-10...

  • Page 121: Image Processing

    Corrects errors in the signal level for each pixel using the white plate. Gamma Correction: Background erase MTF Filtering: Reduces the contrast. Grayscale Processing: Compares each pixel with surrounding pixels to enhance the image. • Text mode: Binary processing • Photo mode: Error diffusion 6-11 C252...

  • Page 122: Master Feed

    Clamper [C] opens. (The drum is at the master feed position.) ↓ The clamper clamps the leading edge of the master. At this time, the cutter [D] cuts the trailing edge of the master. ↓ The master is wrapped around the drum [E]. C252 6-12...

  • Page 123: Master Feed Mechanism

    Then the master feed motor turns off, and cutting is done. NOTE: Springs press the thermal head against the platen roller. The pressure is applied when the master set cover, which includes the platen roller, is closed. 6-13 C252...

  • Page 124: Clamper And Tension Roller Mechanism

    When the clamper opens, it pushes the tension roller arms [I] and moves the tension roller away from the guide plate to allow the master to be fed into the master clamper. • Clamper mechanism: See the Master Eject section 6.2. C252 6-14...

  • Page 125: Cutter Mechanism

    After cutting, the drum starts turning again to wrap the remaining part of the master around the drum. The leading edge of the master that was cut remains at the cutting position, ready to make the next master. 6-15 C252...

  • Page 126: Master Set Cover Sensor

    MASTER FEED 6.5.5 MASTER SET COVER SENSOR C252D911.WMF [A]: Master set cover sensor [B]: Master set cover • If the cover is closed properly, the release button [C] rises. C252 6-16...

  • Page 127: Drum

    2) The main motor speed and the drum stop positions are controlled by monitoring the motor encoder. 3) The ink pump, which is located inside the drum, supplies ink from the ink cartridge into the drum through the drum shaft. 6-17 C252...

  • Page 128: Drum Drive Mechanism

    • Master eject sensor [D] (master eject position and drum home position) • Feed start timing sensor [E] 4) The drum has two stop positions; • Master eject (drum home) position • Master feed position (feed start timing sensor + 111 pulses) C252 6-18...

  • Page 129: Ink Supply Mechanism

    Supplies ink from the ink cartridge to the ink roller via the pump [C]. Ink drops through holes in the ink roller [D]. NOTE: There are four holes in the shaft for the B4 size drum, and two holes for the Legal size drum. 6-19 C252...

  • Page 130: Ink Roller Mechanism

    This happens when the press roller [F] under the drum moves up to press the drum screen and the master against the ink roller. (!: Digital Duplicators – Ink Supply Control) C252 6-20...

  • Page 131: Ink Supply Control

    When the “Clear/Stop” key is pressed while holding down the “0” key, the drum turns 40 rotations to supply ink inside the drum. 4) The ink roller blades [D] on both ends of the ink roller scrape off the built-up ink on the ends of the ink roller. 6-21 C252...

  • Page 132: Detection Of Masters On The Drum

    [B] is exposed. The black patch does not reflect light back to the sensor. Because of this, the master eject process can be skipped when a new master is being made, if no master is detected on the drum. C252 6-22...

  • Page 133: Paper Feed

    The feed roller [A] and the separation pad [B] only allow one sheet to pass. ↓ The registration rollers [C] feed the paper. ↓ The print is made. NOTE: 1) The main motor drives the feed roller. 2) A dedicated stepper motor (registration motor) controls the registration roller. 6-23 C252...

  • Page 134: Paper Feed Mechanism

    2) When the feed roller stops and paper is fed by the registration rollers, the one-way clutches in the feed roller ensure that these rollers do not resist paper feed. 3) The guides [E] help to feed paper that is not perfectly flat. The guides are not used normally. C252 6-24...

  • Page 135: Paper Feed / Separation Pressure Mechanism

    • By loosening then moving the screws [D] up or down, the spring [E], which applies pressure to the friction pad block [F], moves up or down. (This should be done by a technician; !3.7.3) • The default position of the screw [D] is at the lowest position. 6-25 C252...

  • Page 136: Registration Roller Mechanism

    2) The motor speed depends on the selected printing speed. 3) By pressing the image position keys on the operation panel, the registration motor start timing is changed. C252 6-26...
  • Page 137 • When the high point of the cam [B] on the drum drive gear reaches the cam follower [C], the shaft [D] rotates clockwise (as seen from the operation side) to release the upper registration roller [A] from the lower registration roller. 6-27 C252...

  • Page 138: Registration Sensor Cleaning

    PAPER FEED 6.7.5 REGISTRATION SENSOR CLEANING C252D029.WMF NOTE: This mechanism is attached only for the China model. Dust on the registration sensor [A] can be removed by operating a lever [B]. The technician should do this every visit. C252 6-28...

  • Page 139: Printing Pressure Mechanism

    6.7.7 RE-FEEDING MECHANISM If the registration sensor detects a non-feed, the machine will try again. However, if the machine detects a non-feed the second time, the following three indicators light: “A jam indicator”, “”, “”. Also see ‘Paper End Detection’. 6-29 C252...

  • Page 140: Paper Table Mechanism

    (section 6.7.7); the machine cannot distinguish between these two conditions. The user must check for both a paper jam and a paper end condition at this time. After the front cover is opened and closed, only the paper end indicator will remain lit. C252 6-30...
  • Page 141 These are especially useful when thin paper is used. • The users can install the side fence friction pads if they are using thin paper. 6-31 C252...

  • Page 142: Paper Delivery

    The exit pawl [A] and the air knife [B] separate the paper from the drum. ↓ The paper is fed to the paper delivery table [C] by the paper delivery unit [D]. The paper exit sensor [E] is used for jam detection. (!4.4.6) C252 6-32...

  • Page 143: Paper Delivery Unit Drive Mechanism

    Rotates the transport belts [D]. NOTE: 1) The vacuum fan motor inside the unit holds the paper against the belts [D] to deliver the paper to the delivery table. 2) The transport belt rotation speed depends on the selected print speed. 6-33 C252...

  • Page 144: Paper Separation From The Drum

    • The air from the air knife fan motor [A] separates the paper from the drum. • The air knife fan motor starts blowing air when the print start key is pressed or when master cutting is finished. The paper passes under the exit pawl and is delivered to the delivery table. C252 6-34...

  • Page 145: Exit Pawl Drive Mechanism

    • As the master clamper approaches the exit pawl, the high point of the drum flange cam [C] moves into contact with the cam follower [E] pushing it down. This moves the cam follower arm [F] downwards. The pawl shaft turns clockwise to move the pawl away from the drum. 6-35 C252...
  • Page 146 [F] is engaged by the printing pressure release arm [D] and held in the lower position. Therefore, after printing finishes, the cam follower is out of contact with the cam, and the exit pawl moves away from the drum to its normal position. C252 6-36...

  • Page 147: Timing Chart

    TIMING CHART 6.9 TIMING CHART 6.9.1 MASTER EJECT / MASTER FEED C252D937.WMF 6-37 C252...

  • Page 148: Master Wrapping

    TIMING CHART 6.9.2 MASTER WRAPPING C252D938.WMF C252 6-38...

  • Page 149: Printing

    TIMING CHART 6.9.3 PRINTING C252D939.WMF 6-39 C252...

  • Page 151: Specifications

    SPECIFICATIONS...

  • Page 153: General Specifications

    Less than 45 seconds (A4, 8 " x 14) First Print Time Less than 47 seconds (A4, 8 " x 14) Leading Edge Margin 5 mm ± 3 mm Side Registration Adjustable Range ± 10 mm Vertical Registration Adjustable Range ± 10 mm C252...
  • Page 154 -5 to 40 °C, 10 to 95 %RH (Optimum conditions: 15 to 25°C, 20 to 70%RH) Storage period One year after production date (-5 to 40 °C) 18 months after production date (15 to 25 °C) NOTE: Avoid locations exposed to direct sunlight. C252...
  • Page 155 TECHNICAL SERVICE BULLETINS...
  • Page 156 SAVIN – NA SUBJECT: PARTS CATALOG UPDATES GENERAL: The following parts updates are being issued for all C252 Parts Catalogs. UPDATE 1: Drive Support Plate – A bearing holder has been added to the drive support plate to ensure that the portion, which secures the bearing does not deform.
  • Page 157 Tech Service Bulletin No. C252 – 001 UNITS AFFECTED: All C252 digital duplicators manufactured after the serial number listed below will have the new style Drive Support Plate, Bearing Holder and Tapping Screws installed during production. MODEL NAME SERIAL NUMBER...
  • Page 158 The revised areas have been highlighted by an arrow PAGES: • Updated Information (Installation Procedure) UNITS AFFECTED: All C252 duplicators manufactured after the serial number listed below will have the new style Styrene foam sponge installed during production MODEL NAME SERIAL NUMBER Gestetner 6123cp...
  • Page 159 Press Roller during transport. If they are not removed, paper jams or blank images may occur, due to the lack of pressure on the Press Roller and the Front Tape tape may stick to the drum screen or Press Roller. C252...
  • Page 160 The original is smaller than the printing paper. NOTE: The C252 has the following limitations: The machine cannot detect the original size or printing paper size. The machine makes the master image onto two sizes only: 253 mm x 358 mm (B4 model) or 216 mm x 358 mm (LG model).
  • Page 161 Tech Service Bulletin No. C252 – 003 SOLUTIONS: For Cause 1: 1. Measure the distance from the paper edge to the black line (X mm). 2. Move the side fences a distance of about X mm, so that the edge of the paper aligns with the edge of the original.
  • Page 162 FIRMWARE HISTORY...
  • Page 163 FTP Internet Web Site and EPROM/Flash Card Exchange program. ⇒ The revised areas have been highlighted by an arrow TABLE OF CONTENTS: ⇒ Firmware Modification History: .............2 ⇒ Firmware Modifications: ...............2 Copyright 2003 RICOH Corporation. All rights reserved. Page 1 of 2...
  • Page 164 Firmware History for C252 FIRMWARE MODIFICATION HISTORY: C2525105 File Name Check Sum Production C2525105F.bin 56BA F3130970947 C2525105E.bin 56B6 April, 2003 production ⇒ C2525105D.bin 6917 1st Mass Production FIRMWARE MODIFICATIONS: Symptom Corrected Suffix ⇒ - Changed the binary processing data to darken the image density of orange when selected the letter and darker modes.

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