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Lexmark Repair Catalog
The following information is from Lexmark's Service Mnaual.
Lexmark™ C920
Lexmark and Lexmark with diamond design are
trademarks of Lexmark International, Inc., registered
in the United States and/or other countries.
5056-xxx
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Table of Contents
Related Manuals for Lexmark 5056
Summary of Contents for Lexmark 5056
- Page 1 Lexington, Kentucky 40550, U.S.A or e-mail at ServiceInfoAndTraining@Lexmark.com. Lexmark may use or distribute any of the information you supply in any way it believes appropriate without incurring any obligation to you. Lexmark, Lexmark with diamond design, and MarkNet are trademarks of Lexmark International, Inc., registered in the United States and/or other countries.
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Page 2: Repair Information
Never touch the terminals of electrical parts or high-voltage parts such as the HVPS (high voltage power supply) board. • Be sure to handle the fuser carefully, as it remains hot for a while after the printer stops running. Always unplug connectors by holding the connector housing. •... -
Page 3: Rip Board/Operator Panel Replacement
Note: If the operator panel display has failed, the printers’ startup cycle is complete when the driver motor and fans shut down, and the machine is quiet. After installing the new operator panel, start the printer, and allow the printer to go through a complete startup cycle and the display to go to Ready. -
Page 4: Check Finisher Alignment When Moving Or Servicing The Finisher
5056-XXX Check finisher alignment when moving or servicing the finisher After moving or servicing the finisher, print some test pages to the finisher to ensure the vertical and horizontal “Aligning the finisher and printer” on alignment is correct. If the finisher is not properly aligned, refer to page 3-59 for alignment instructions. -
Page 5: High-Capacity Paper Feed Timing Belt Adjustment
The adjustments are in the Repair information and Diagnostic aids chapters. Printer controller board/printer control EPROM (U7) If you replace the printer controller board, remove EPROM (U7), and install it on the new board. Also check the printhead alignment. Printhead controller board If you replace the printhead controller board, replace all the eeproms from the old printhead controller board. -
Page 6: Transfer Belt
5056-XXX Transfer belt If you replace the transfer belt, check the printer alignment (X, Y, and Theta), adjusted in diagnostic mode. LED printhead controller board or LED printhead If you replace the LED printhead controller board or LED printhead, check and adjust the following items in... -
Page 7: Cover, Top Removal
5056-XXX Removals Cover, top removal Open the top unit, and remove the photodevelopers and toner cartridges. Cover the photodevelopers to avoid damage from exposure to the light. Remove the two silver screws, and remove the spacer. Remove five black screws from the bottom and the four silver screws from the back side. -
Page 8: Front Door / Operator Panel Removal
Replace the RIP card (this must be the first part replaced). Restart the printer. Let the machine finish the startup cycle, which takes several minutes. The machine is silent when startup is complete. -
Page 9: Cover, Front Left Removal
5056-XXX Remove six screws (C) that hold the operator panel to the front door. Remove the operator panel from the door. Note: If the USB cable or the operator panel cable is being replaced, use the toroids from the old cables with the new cables. -
Page 10: Cover, Rear Removal
Remove the screw from the solenoid cover. Remove the solenoid cover. Cover, left side removal Remove the upper cassette, front cover, paper exit tray, and duplex unit. Remove the five screws from the left side cover, and remove the cover. 5056-XXX Repair information... -
Page 11: Cover, Right Side Removal
5056-XXX Cover, right side removal Open the top unit, and remove the front cover and upper cassette. Remove the operator panel cable and the USB cable from the operator panel. (See “Front door / operator panel Remove the seven screws from the right side cover together with the turn guide, and remove the cover. -
Page 12: Cover, Rip Board Removal
Replace the RIP card first (this must be the first part replaced). Restart the printer. Let the machine finish the startup cycle. This takes a few minutes. The machine is silent when startup is complete. -
Page 13: Tray, Paper Exit Removal
Remove the paper exit tray. Belt up/down clutch removal Remove the RIP cover, electronic box, printer controller card, and HVPS board. Unplug the belt up/down clutch cable from CN1 in the CK1 daughter card board. Remove the C-clip from the belt up/down clutch, and remove the clutch. -
Page 14: Cassette Guide Removal
Remove printer controller board and HVPS board. Disconnect all cables from the daughter board. While pinching the nylon standoffs that attach the card to the printer frame, gently pull the CK1 daughter board away from the printer frame. Note: After replacing any board on the printer, ensure all the connections are properly connected before closing the covers. -
Page 15: Connector, Duplex Unit Removal
5056-XXX Connector, duplex unit removal Open the top unit and remove the upper cassette, left front cover, paper feed cover, left side cover, RIP cover, RIP board, RIP box, and the electronic box. Remove the turn guide, open the paper feed cover, and remove the duplex unit. -
Page 16: Density Sensor Removal/Separation Fingers Removal/Sensor Cleaner Removal
Remove the four separating finger screws from the fuser entrance guide. Drive gear unit sensor assembly removal Open the top unit, and remove the gear cover, RIP cover, RIP board, RIP box, electronic box, printer controller, and high voltage power supply board. -
Page 17: Electronic Box Removal
5056-XXX Electronic box removal Open the top unit, and remove the back cover. Remove the RIP board cover. Remove the RIP board. Remove the screws from the electronic box. Disconnect all cables from the rear of the electronic box, and remove the box. -
Page 18: Face Up Paper Exit Assembly Removal
Remove the left front cover, left side cover, and rear cover. Remove the three screws from the face up delivery assembly, and remove the assembly. Front cover open switch actuator removal Open the front cover. Remove the two screws from the front cover open switch actuator. 5056-XXX 4-17 Repair information... -
Page 19: Fuser Removal
5056-XXX Fuser removal Open the top unit. Pushing the front and back lock, hold the handle, and then raise and remove the fuser. 4-18 Service Manual... -
Page 20: Gear Cover Removal/Multipurpose Feeder Frame Assembly
Pull out the multipurpose feeder frame slightly. Remove the screw from the OHP detection sensor (upper). Turn the bearing stopper of the multipurpose feeder roll forward 1/4 turn, and remove upward. Remove the multipurpose feeder frame assembly. 5056-XXX 4-19 Repair information... -
Page 21: High Voltage Power Supply Board (Hvps) Removal
Note: When removing the high voltage power supply, be careful to avoid damaging the secondary daughter card (Q906). If the daughter card gets damaged, a 925 service error will result. Open the top unit, and remove the RIP cover, RIP board, RIP box, electronic box, and printer controller board. -
Page 22: Eraser Removal
When replacing the LED printhead, replace the corresponding EEPROM, shipped with the printhead, on the printhead controller board. Note: The LED printhead light intensity values do not have to be entered for the printer. Eraser removal Remove the appropriate printheads (see the transfer belt to protect it from damage. -
Page 23: Lock Handle Assembly Removal
5056-XXX Lock handle assembly removal Open the top unit. Turn the plastic latch on the front and rear sides 90°. Remove the spring. Remove the lock handle assembly. 4-22 Service Manual... -
Page 24: Main Drive Unit Removal
Remove the two screws of the fuser connector cable assembly from the fuser connector plate. Note: Note the direction, when installing. After removing the two screws on the bracket that attaches the rear side and paper exit side of the machine, remove the nine screws from the bracket. 5056-XXX 4-23 Repair information... - Page 25 5056-XXX Remove the screw from the clutch stopper. The clutch stopper is attached to the ground plate with two screws. Remove the six screws on the right side. Remove the two screws from the drive unit, and remove the unit.
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Page 26: Main Unit Fan Removal
Multipurpose feeder paper present sensor removal Open the top unit and remove the upper cassette, front cover, turn guide, multipurpose feeder, right side cover, turn guide, and multipurpose feeder frame. Disconnect the connector and remove the multipurpose feeder paper present sensor. 5056-XXX 4-25 Repair information... -
Page 27: Multipurpose Feeder Tray Removal
Paper feed unit removal Remove the front, right, left rear, and rear covers. Remove the printer controller board and HVPS board. Unplug connectors CN23, CN16, CN10, CN20, CN12, CN15, and CN7 on the CK1 daughter card board. Remove the e-clip and bushing (A) from the paper feed clutch. - Page 28 Remove the 3 screws (D), and remove the cassette guide. Remove the brass screws (E) on the left side of the paper feed unit. Remove the paper feed unit, being careful to route the sensor cabling through the wire guides. 5056-XXX 4-27 Repair information...
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Page 29: Paper-Feed Rollers Removal
Note: This removal can be used for the expansion paper feed roller removal. Do not discard the white plastic retaining clips. They will be needed to attach the new rollers. Turn off the printer, and unplug the power source. Remove the paper cassette. -
Page 30: Paper Carrying Frame Removal / Roll Removal
Remove the carry clutch and plastic bushing on the left side of the carrying frame. Remove the E-clip and bushing on the right side of the carrying frame. Remove the carrying roller. 5056-XXX 4-29 Repair information... -
Page 31: Registration Sensor Removal
5056-XXX Registration frame Registration clutch removal Open the top unit, open the turn guide, open the paper feed cover, and pull out the duplex unit halfway. Remove the two screws from the registration frame. Remove the registration clutch. Note: When installing, set the clip of the registration clutch to the stopper. -
Page 32: Relay Roller Removal
Remove the top plate from the paper-feed unit. Slide the relay roller to the right (B), and tilt the roller up and out of the unit. Pull the relay roller to the left (C), and remove the roller from the paper-feed unit. 5056-XXX 4-31 Repair information... -
Page 33: Face Down Guide Assembly Removal
Note: When replacing the face down unit, use a tie to hold back the wiring that connects the printer controller board to the face down unit. Avoid pinching or cutting wiring that connects the face down unit to the printhead controller board. - Page 34 Remove the rear cover. Remove the motor and drive belt from the exit roller shaft. Remove the grounding strip (A). 5056-XXX 4-33 Repair information...
- Page 35 5056-XXX Remove the e-clips and bushings (A) from both ends of the exit roller shaft. Pull the guide rib (A) to the left. 4-34 Service Manual...
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Page 36: Power Supply 1 Removal
Disconnect CN106 and CN04 at power supply 2. Remove the power supply. Note: When installing, incline the ground wire by 45°. Note: After replacing any board on the printer, ensure all the connections are properly connected before closing the covers. 5056-XXX... -
Page 37: Power Supply 2 Removal
Disconnect the connector, and remove the seven screws from power supply 2, and remove the power supply. Note: After replacing any board on the printer, ensure all the connections are properly connected before closing the covers. Note: Before installing the new power supply, remove the black actuator guide (A) from the old power supply and install it on the new power supply. -
Page 38: Power Switch Removal
Open the top unit, and remove the RIP cover, RIP board, RIP box, and electronic box. Remove the connectors and the screws from the printer controller. Pay attention to the location, or label the two pin connectors when removing them from the board to avoid reconnection into the wrong location. -
Page 39: Printhead Controller Board Removal
5056-XXX Printhead controller board removal Remove the top cover, and then remove the 20 printhead controller board connectors. Remove the six screws from the printhead controller board and remove the board. Note: When replacing the board, be sure to return the four EEPROMs on the former board to the same positions on the new board. -
Page 40: Left Slide Rail Removal
Left slide rail removal Remove the upper cassette. Remove the screw from both left and right slide rails. RIP box removal Remove the six screws from the RIP box. Slightly lift and remove the RIP box. 5056-XXX 4-39 Repair information... -
Page 41: Sensor Board Removal
5056-XXX Sensor board removal Remove the transfer belt unit. Remove the four connectors. Remove the three screws from the waste toner full sensor board. Stay arm removal Open the top unit, and remove the face down paper guide assembly. Remove the yellow and black sub frame. -
Page 42: Sub-Frame Removal
Sub-frame removal Important: Read the entire procedure before removal. Open the top unit, and remove the RIP cover, RIP board, RIP box, electronic box, printer controller, printer controller bracket, and HVPS board. Remove the cable ties. Remove the 12 screws from the sub frame. -
Page 43: Sub Frame F1, Sub Frame F2 Removal
Black Sub frame F2 Temperature/humidity sensor removal Remove the rear cover, printer controller board, and HVU board. Disconnect the cable from connector on the temperature humidity sensor. Remove the screw (A) holding the sensor to the paperfeed gear linkage. Remove the temperature/humidity sensor. -
Page 44: Top Unit Removal
Note: If the operator panel is inoperable, or if you have an unrecoverable error code, this procedure can still be used. Turn the printer off, along with any optional devices connected to the printer. Open the front cover and top unit. - Page 45 5056-XXX Loosen the thumbscrews as shown. Lift and remove the transfer belt cover. 4-44 Service Manual...
- Page 46 Loosen the thumbscrews as shown. Press down on the transfer belt release lever as shown. 5056-XXX 4-45 Repair information...
- Page 47 5056-XXX Pull the transfer belt out. After replacing the transfer belt and removing the four shipping spacers, tighten the transfer belt thumbscrews, and reinstall the transfer belt cover. Close the top unit, rotate the locking lever to the right, and close the front cover.
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Page 48: Turn Guide Cover Sensor Removal
Open the top unit, and remove the toner cartridges and photodeveloper drum units, top cover, and face- down guide assembly. Remove the four screws and the five screws from the upper bracket, and remove the bracket. 5056-XXX 4-47 Repair information... - Page 49 5056-XXX Remove the two screws from the left fan, and remove the fan. Remove the two screws from the right fan, and remove the fan. 4-48 Service Manual...
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Page 50: Turn Guide Door Removal
Unplug all cables from the expansion feeder controller board. Remove six screws from the controller card. Remove the controller board. Note: After replacing any board on the printer, ensure all the connections are properly connected before closing the covers. Size sensor board removal Remove the expansion feeder controller board. -
Page 51: Stepper Motor Removal
5056-XXX Stepper motor removal Remove the expansion feeder rear cover. Disconnect the stepper motor power cable from the expansion feeder controller board. Remove three screws from the stepper motor assembly (A). Remove the stepper motor assembly from the expansion feeder. -
Page 52: Paper Feed Assembly Removal
Remove three screws from the left side of the paper feed unit (F). Feed the sensor cables through the side. Use care to avoid damaging the insulation. Gently lift the paper feed unit out of the expansion feeder. 5056-XXX 4-51 Repair information... -
Page 53: Expansion Feeder Turn Guide Door Sensor Assembly Removal
5056-XXX Paper tray lift motor removal Remove the rear cover. Remove the cassette. Disconnect the cable from the paper tray lift motor. Remove three black screws from the paper tray lift motor (A). Remove the paper tray lift motor. Expansion feeder turn guide door sensor assembly removal Remove the rear cover. -
Page 54: Duplex Unit Separation Removal
Duplex removals Duplex unit separation removal Remove the thumbscrews, C-clips, and screws as shown from both sides. Remove the connectors, and separate the duplex frame from the duplex unit. 5056-XXX 4-53 Repair information... -
Page 55: Duplex Unit Removal
5056-XXX Duplex unit removal Remove the four screws from the interface board, and remove the board. Remove the two screws from the duplex connector, and remove the connector. Duplex timing belt removal Remove the three C-clips from the three timing gears, and remove the timing belts. -
Page 56: Duplex Pressure Roller And Solenoid Removal
Remove the two screws securing the pressure roller solenoid assembly. Duplex feed roller and solenoid removal Remove the two screws securing the feed roll solenoid assembly. Remove the pressure roller and springs. Remove the feed roller and springs. 5056-XXX 4-55 Repair information... -
Page 57: Duplex Side Fence Motor Assembly/Side Fence Removal
5056-XXX Duplex side fence motor assembly/side fence removal Remove the three screws, and remove the side fence motor assembly. Remove the front and rear side fences. Note: When installing, spread the front and rear side fences to the sides, and install. -
Page 58: Duplex Paper Carrying Motor Removal
Duplex paper carrying motor removal Remove the gear cover. Remove the screws from the duplex paper carrying motor, and remove the motor. 5056-XXX 4-57 Repair information... -
Page 59: High-Capacity Feeder (Hcf) Removals
5056-XXX High-capacity feeder (HCF) removals HCF covers removal Remove the two screws from the drive cover, and remove the cover. Remove the front cover. Remove the two screws from the right cover, and remove the cover. Remove the top cover. -
Page 60: Hcf Call Roller, Paper Feed Roller, Reverse Roller Removal
Remove the two screws from the drive cover, and remove the cover. Remove the screw from the clamp plate, and remove the plate. Remove the connector and the two screws from the pickup solenoid, and remove the solenoid. 5056-XXX 4-59 Repair information... -
Page 61: Hcf Paper End Sensor Removal
5056-XXX HCF paper end sensor removal HCF paper size sensors (1, 2) removal Cover the paper level sensor with your hand, and press the down button. The tray moves down. Lower the tray until the down sensor turns on. Remove the front cover and transfer cover. -
Page 62: Hcf Tray Motor Removal
Top Cover Switch 1 Blue HCF tray motor removal Remove the rear cover and the drive cover. Remove the two screws of the tray motor, and remove the motor. White Blue Green Yellow Black Top Cover Switch 2 5056-XXX 4-61 Repair information... -
Page 63: Hcf Paper Level Sensor Removal
5056-XXX HCF paper level sensor removal Remove the four screws from the transfer cover, and remove the cover. Remove the two screws from the sensor, and remove the cover. Remove the connector and screw from paper level sensor, and remove the sensor. -
Page 64: Finisher Removals
Remove the finisher trays. Remove the two screws from the front cover, and remove the cover. Remove the two screws from the rear cover, and remove the cover. “Aligning the finisher and printer” on page 3-59 5056-XXX for alignment instructions. -
Page 65: Finisher Control Board Removal
5056-XXX Remove the two screws from the top cover, and remove the cover. Finisher control board removal Remove the external covers. Disconnect all of the associated connectors. Remove the four finisher control board mounting screws, and remove the board. 4-64... -
Page 66: Elevator Motor Removal
Remove the finisher control board mounting bracket. Loosen the tension bracket mounting screw. Disconnect the feed motor connector. Remove the three screws and connector from the feed motor mounting bracket, and remove the feed motor assembly. Remove the feed motor pulley. 5056-XXX 4-65 Repair information... -
Page 67: Hole Punch Removal
5056-XXX Hole punch removal Remove the external covers. Remove the hole punch unit cables. Remove the tension spring. Remove the screw and E-ring from the tension bracket, and remove the bracket. Note: When installing the tension bracket, use the left side screw hole for the three hole punch unit and the right side screw hole for the four hole punch unit. -
Page 68: Inverter Paper Exit Discharge Brush Removal
Inverter paper exit roller removal Remove the front and rear external covers. Remove the four lower left panel screws, and remove the panel. Disconnect the harness connect from the lower left panel. Remove the inverter paper exit roller bushing. 5056-XXX 4-67 Repair information... -
Page 69: Jogging Unit Removal
5056-XXX Remove the inverter idle gear. Remove the inverter drive gear and bushing. Remove the inverter paper exit roller. Jogging unit removal Remove the dust box. Remove the two screws, and remove the cover. Disconnect the jogging motor connector. Disconnect the jogging home position sensor connector. -
Page 70: Path Select Gate Removal
Remove the upper guide plate for the straight paper exit. Remove the two screws and two springs for the upper guide plate. Remove the path select gate. Note: Adjust the solenoid bracket mounting position so that the gate arm is contacting the solenoid. 5056-XXX 4-69 Repair information... -
Page 71: Patting Roller Removal
5056-XXX Patting roller removal Remove the front and rear covers. Remove the finisher control board mounting bracket. Remove the two screws from the upper left panel, and remove the panel. Disconnect the sensor connector. Remove the sensor harness from the harness clamp. - Page 72 Remove the tension springs. Use the upper hole when installing the spring. Remove the gear and bushing. Remove the patting roller. 5056-XXX Patting Roller Repair information 4-71...
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Page 73: Power Supply Removal
5056-XXX Power supply removal Unplug the power cord from the printer. Remove the external covers. Remove the lower left panel. Remove the cable connector for the left panel. Remove the four lower guide support plate screws, and remove the plate. -
Page 74: Registration Roller Clutch Removal
Remove the harness from the clamp. Remove the three control board mounting bracket screws, and remove the bracket. Remove the registration roller clutch set screw. Remove the registration roller clutch connector. Remove the registration roller clutch. 5056-XXX 4-73 Repair information... -
Page 75: Stack Area Discharge Brush Removal
5056-XXX Stack area discharge brush removal Remove the dust box. Remove the stack area discharge brushes. Staple unit removal Remove the staple unit connector. Pull outward on the staple cover, and remove the staple unit. 4-74 Service Manual... -
Page 76: Straight Paper Exit Discharge Brush Removal
Remove the two discharge brush screws, and remove the brush. Straight paper exit roller removal Remove the external covers. Remove the finisher control board. Remove the upper left panel. Remove the front straight paper exit roller bushing. Remove the belt and pulley. 5056-XXX 4-75 Repair information... - Page 77 5056-XXX Remove the rear straight paper exit roller E-ring and bushing. Remove the straight paper exit roller. 4-76 Service Manual...
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Page 78: Timing Belts 1 And 2 Removal
Remove the feed motor mounting bracket. Remove the tension bracket mounting screw. Remove the tension spring. Remove the timing belt 1. Loosen the tension bracket mounting screw for timing belt 2. Remove the timing belt 2. 5056-XXX 4-77 Repair information... -
Page 79: Tractor Belt Removal
5056-XXX Tractor belt removal Remove the external covers. Remove the lower left panel. Remove the cable connector of the left panel. Remove the belt motor unit. Remove the four lower guide support plate screws for the invert paper exit. Remove the tension spring from the shaft. -
Page 80: Tractor Drive Motor Assembly Removal
Note: Install the belt so that the belt tooth just under the plastic hook aligns with the hook on the other belt. Tractor drive motor assembly removal Remove the outer covers. Remove the drive belt. Remove the three screws, and disconnect the connector from the tractor drive motor assembly. Remove the tractor drive motor assembly. 5056-XXX 4-79 Repair information...