Xerox 7700DX Service Manual - Page 83
ERROR 20 TRANSFER ROLLER CONTACT FAILURE, Error, Chain, Front Panel Message
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Error Code Chain / Link Front Panel Message 20 09-342 ERROR 20 TRANSFER ROLLER CONTACT FAILURE Enter Service Diagnostics Mode. Perform the "2nd BTR Motor" test. Listen for a short run of the motor. Did the motor run? Yes No Remove the Left-Hand Rear Mid Cover (RRP 5, on page 7-158). Inspect the Left-Hand Cover Assembly wiring harness for damage and ensure all connectors are properly seated. If the problem persists, replace the Engine Control Board (RRP 42, on page 7-206). If the problem continues to persist, replace the entire Left-Hand Cover Assembly (RRP 6, on page 7-160). Remove the Rear Cover (RRP 1, on page 7-154) and Rear Shield (RRP 9, on page 7-163). Reconnect power and enter Service Diagnostics Mode. Measure the voltage at the Engine Control Interface Board P532A-14 (see figure page 2-46). Perform the "2nd BTR Motor" several times. Does the voltage toggle between +5 VDC and 0 VDC when the test is run? Yes No Replace the Transfer Roller Retract Sensor. Replace the Engine Control Board (RRP 42, on page 7-206). 21 09-343 ERROR 21 TRANSFER ROLLER RETRACT FAILURE Enter Service Diagnostics Mode. Perform the "2nd BTR Motor" test. Listen for a short run of the motor. Did the motor run? Yes No Remove the Left-Hand Rear Mid Cover(RRP 5, on page 7-158). Inspect the Left-Hand Cover Assembly wiring harness for damage and ensure all connectors are properly seated. If the problem persists, replace the Engine Control Board (RRP 42, on page 7-206). If the problem continues to persist, replace the entire Left-Hand Cover Assembly (RRP 6, on page 7-160). Remove the Rear Cover (RRP 1, on page 7-154) and Rear Shield (RRP 9, on page 7-163). Reconnect power and enter Service Diagnostics Mode. Measure the voltage at the Engine Control Interface Board P532A-14 (see figure page 2-46). Perform the "2nd BTR Motor" several times. Does the voltage toggle between +5 VDC and 0 VDC when the test is run? Yes No Replace the Transfer Roller Retract Sensor. Replace the Engine Control Board (RRP 42, on page 7-206). Phaser 7700 Color Laser Printer Service Manual 2-53