Xerox 7700DX Service Manual - Page 124
Front Panel displays \, Troubleshooting - Printer Comes to a “Ready” State, False LH Door, RH Door
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Front Panel displays "Fatal Fault Encountered" message See procedure for "Error 81 Controller to Engine Communications Failure" on page 2-70. Troubleshooting - Printer Comes to a "Ready" State False LH Door, RH Door, or Front Door Open Messages See procedure for "Troubleshooting the Interlock Circuit", on page 3-91. False "Load Paper in Tray [1,2,3,4]" Message In order for the printer to recognize paper in the paper tray, one or both of the top two Paper Size Switches must be closed, the Tray Level Sensor must be actuated by the lift mechanism and the No Paper Sensor must be deactuated. 1. Remove the Paper Tray and check for damage. Check the No Paper Sensor actuator for damage and freedom of movement. If it is a Universal Tray, swap the tray with another if available. 2. If available, swap the Feeder Assembly with one from another tray. (Does not apply to HCF Tray 4.) 3. Enter Service Diagnostics Mode and run the sensor test. Check sensor operation by lifting and lowering the No Paper Sensor Lever while observing the display. 4. Verify continuity of the wiring between the No Paper Sensor and the Control Board. 5. If the problem is with Tray 2, 3 or 4, replace the Auxiliary Feeder Control Board (RRP 1-59). 6. Replace the Engine Control Board (RRP 42, on page 7-206). False "Tray [1,2,3,4] Missing" Message In order for the printer to recognize the presence of a paper tray, one or both of the top two Paper Size Switches must be closed. Note There are special instances where a false "Tray Missing" error can be reported. Check the fault list to ensure that no other errors are present. 1. Check the Tray Level Sensor actuator for damage and freedom of movement. Check the Paper Size Switches for damage. 2. Enter Service Diagnostics Mode and run the sensor test. Check the Level Sensor operation by removing and reinserting the paper tray while observing the display. 3. If available, swap the Feeder Assembly with one from another tray. (Does not apply to HCF Tray 4). 4. Verify continuity of the wiring between the No Paper Sensor and the Control Board. 5. If the problem is with Tray 2, 3 or 4, replace the Auxiliary Feeder Control Board (RRP 60, on page 7-229). 6. Replace the Engine Control Board (RRP 42, on page 7-206). 3-94 Phaser 7700 Color Laser Printer Service Manual