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Lexmark™ C920
5056-xxx
Lexmark Repair Catalog
The following information is from Lexmark's Service Mnaual.
The following paragraph does not apply to any country where such provisions are inconsistent with local law:
LEXMARK INTERNATIONAL, INC. PROVIDES THIS PUBLICATION “AS IS” WITHOUT WARRANTY OF ANY KIND,
EITHER EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Some states do not allow disclaimer of express or
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5056-XXX Repair information Handling ESD-sensitive parts Many electronic products use parts that are known to be sensitive to electrostatic discharge (ESD). To prevent damage to ESD-sensitive parts, use the following instructions in addition to all the usual precautions, such as turning off power before removing logic boards: • Keep the ESD-sensitive part in its original shipping container (a special “ESD bag”) until you are ready to install the part into the machine. • Make the least-possi
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5056-XXX RIP board/operator panel replacement Warning: If the operator panel and the RIP board are being replaced at the same time, replace the parts in this order to avoid damage to the machine. 1. Replace the RIP card first. Note: Do not replace the new operator panel and RIP card in the machine at the same time. 2. After installing the new RIP card, and before installing the new operator panel, start the printer. 3. After the printer has completed startup, turn off the printer and rep
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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 alignment is correct. If the finisher is not properly aligned, refer to “Aligning the finisher and printer” on page 3-59 for alignment instructions. Repair information 4-3
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5056-XXX Adjustments High-capacity paper feed timing belt adjustment 1. Secure the bracket with the screw, as shown. 2. Attach the spring and washer to the bracket with the screw. 3. Adjust the screw to 6mm ±1mm. 4. Tighten the screw completely. 5. Adjust the timing belt on the rear in the same manner. Adjustments and procedures following parts replacement Note: When troubleshooting, or prior to making any adjustment to print quality, always be sure: • The printer is installed on a level, rig
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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 diagnostic mode: Printer Alignment (X, Y, and Theta) Print the alignment pages. Make sure that you installed the EEPROMS supplied with the printhead on the printhead controller board. Repair information 4-5
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5056-XXX Removals Cover, top removal 1. Open the top unit, and remove the photodevelopers and toner cartridges. Cover the photodevelopers to avoid damage from exposure to the light. 2. Remove the two silver screws, and remove the spacer. 3. Remove five black screws from the bottom and the four silver screws from the back side. 4. Remove the top cover. Note: When replacing the top cover, avoid pinching or cutting wires that connect the printhead controller board to the face down unit. 4-6 Se
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5056-XXX Front door / operator panel removal Warning: If the operator panel and the RIP board are being replaced at the same time, replace the parts in the order described in steps a through d below to avoid damage to the machine. a. Replace the RIP card (this must be the first part replaced). b. Restart the printer. Let the machine finish the startup cycle, which takes several minutes. The machine is silent when startup is complete. c. Install the new operator panel. d. Restart the printer
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5056-XXX 8. Remove six screws (C) that hold the operator panel to the front door. 9. 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. Cover, front left removal 1. Open the front cover and remove the cassette. 2. Remove the left front cover by removing the three silver screws. 4-8 Service Manual
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5056-XXX Cover, rear removal 1. Open the top unit. 2. Remove the three silver screws from the rear cover, and then remove the cover. Cover, solenoid removal 1. Remove the screw from the solenoid cover. 2. Remove the solenoid cover. Cover, left side removal 1. Remove the upper cassette, front cover, paper exit tray, and duplex unit. 2. Remove the five screws from the left side cover, and remove the cover. Repair information 4-9
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5056-XXX Cover, right side removal 1. Open the top unit, and remove the front cover and upper cassette. 2. Remove the operator panel cable and the USB cable from the operator panel. (See “Front door / operator panel removal”.) 3. Remove the seven screws from the right side cover together with the turn guide, and remove the cover. 4. When installing the right side cover, insert the turn guide shaft into the bearing. 4-10 Service Manual
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5056-XXX Cover, RIP board removal Warning: If the operator panel and the RIP board are being replaced at the same time, replace the parts in this order to avoid damage to the machine. 1. Replace the RIP card first (this must be the first part replaced). 2. Restart the printer. Let the machine finish the startup cycle. This takes a few minutes. The machine is silent when startup is complete. 3. Install the new operator panel. 4. Restart the printer, and let the startup cycle complete. If
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5056-XXX Tray, paper exit removal 1. Unlatch the hinge at the back side, then unlatch the hinge on the front side. 2. Remove the paper exit tray. Belt up/down clutch removal 1. Remove the RIP cover, electronic box, printer controller card, and HVPS board. 2. Unplug the belt up/down clutch cable from CN1 in the CK1 daughter card board. 3. Remove the C-clip from the belt up/down clutch, and remove the clutch. 4-12 Service Manual
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5056-XXX Cassette guide removal 1. Remove the paper feed frame. 2. Remove the front cover, cassette, turn guide, right side cover, and paper feed frame. 3. Remove the screws from the cassette guide, and remove the guide. CK1 daughter board removal 1. Remove the front, right, left rear, and rear covers. 2. Remove printer controller board and HVPS board. 3. Disconnect all cables from the daughter board. 4. While pinching the nylon standoffs that attach the card to the printer frame, gently p
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5056-XXX Connector, duplex unit removal 1. 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. Remove the left side cover and power supply A. 2. Disconnect the connector, and remove the two screws from the mounting plate. 3. Remove the two screws of the drawer connector from the mounting plate drawer bracket.
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5056-XXX Density sensor removal/Separation fingers removal/Sensor cleaner removal 1. Open the top unit and remove the belt unit. 2. Remove the three screws from the sensor bracket. 3. Remove the harness band and remove the two screws from the density sensor from the sensor bracket. 4. Remove the three set screws from the sensor cleaner assembly from the sensor bracket. 5. Remove the four separating finger screws from the fuser entrance guide. Drive gear unit sensor assembly removal 1. Open t
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5056-XXX Electronic box removal 1. Open the top unit, and remove the back cover. 2. Remove the RIP board cover. 3. Remove the RIP board. 4. Remove the screws from the electronic box. 5. Disconnect all cables from the rear of the electronic box, and remove the box. 4-16 Service Manual
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5056-XXX Face up paper exit assembly removal 1. Open the top unit, and remove the upper cassette. Open the duplex cover, and remove the duplex unit. 2. Remove the left front cover, left side cover, and rear cover. 3. Remove the three screws from the face up delivery assembly, and remove the assembly. Front cover open switch actuator removal 1. Open the front cover. 2. Remove the two screws from the front cover open switch actuator. Repair information 4-17
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5056-XXX Fuser removal 1. Open the top unit. 2. Pushing the front and back lock, hold the handle, and then raise and remove the fuser. 4-18 Service Manual
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5056-XXX Gear cover removal/Multipurpose feeder frame assembly 1. Open the top unit, and remove the upper cassette, front cover, multipurpose feeder, right side cover, and turn guide. 2. Remove the two screws from the gear cover, and remove the cover. 3. Remove the four screws from the multipurpose feeder frame and the ground screw. 4. Disconnect the connector of the multipurpose feeder paper feed sensor. 5. Pull out the multipurpose feeder frame slightly. 6. Remove the screw from the OHP de
