Lexmark C750 Service Manual - Page 105
Lexmark C750 Manual
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5060-00x 201 Paper jam Step 1 Action and questions Remove fuser from printer, remove oiler housing from fuser, and pivot the paper guide up. Is paper jammed inside the fuser? 2 Check fuser entry guide for toner buildup. Is toner built up on the fuser entry guide? Replace the fuser. See "Fuser assembly removal" on page 4-31. Go to step 4 Go to step 3 Yes Clear the jam. No Go to step 2 3 Check fuser exit sensor flag. Does the flag rotate freely and return to normal position when released? Replace the fuser. See "Fuser assembly removal" on page 4-31. Perform the following in order: 1. Reseat the connector J10 on the engine board. 2. Replace the fuser. See "Fuser assembly removal" on page 4-31. 3. Replace the LVPS. See "Low voltage power supply (LVPS) removal" on page 4-38. 4. Replace the engine board. See "Engine board removal" on page 4-29. 4 Reinstall fuser and perform the "BASE SENSOR TEST" on page 3-29. Note: Use a spring hook to actuate the flag. Does fuser exit sensor pass test? Go to step 5 5 Check the vacuum transport belts (VTB) for motion. Observe the belt through the front door. Are the belts on the VTB assembly turning? Go to step 6 Go to "Vacuum transport belt (VTB) removal" on page 4-82 to verify correct installation. Go to step 7. 6 Check the VTBs for wear or damage. Are the belts worn or damaged? Replace the VTB. See "Vacuum transport belt (VTB) removal" on page 4-82. Clean off the VTB plate. Call the next level of support. 7 Check the VTB plate for a buildup of debris. Is there a debris buildup? Go to step 8 8 Does media move smoothly into the fuser from the VTB? Replace the "Vacuum transport belt (VTB) fan" on page 4-73. Diagnostic information 2-71