Xerox 7700DX Service Manual - Page 109
Finisher Error 120 Eject Clamp Home Sensor On, Failure, Finisher Error 121 Eject Clamp Home Sensor
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Error Code Chain / Link Front Panel Message 120 12-260 FINISHER ERROR 120 EJECT CLAMP HOME SENSOR ON FAILURE 121 12-262 FINISHER ERROR 121 EJECT CLAMP HOME SENSOR OFF FAILURE Remove the Finisher Rear Cover (RRP 72, on page 11-330). Remove the sensor from the top of the eject motor mount bracket (RRP 76, on page 11-335). Enter Service Diagnostics Mode. From the Main Menu, select "Sensor Tests/Finisher Sensors/Miscellaneous." Manually actuate the Eject Clamp Home Sensor and observe the display. Does display indicate the Eject Clamp Home Sensor toggling between H & L? Yes No Remove the Rear Cover and the Board Cover (RRP 72, on page 11-330). Measure the voltage between the Finisher Control Board P849-5 (see figure page 2-46) and Finisher frame ground. Again manually actuate the Stack Height Sensor. Does the voltage toggle between +5 VDC and 0 VDC? Yes No Measure the voltage at the Eject Clamp Home Sensor pin 2 (yellow) and Finisher frame ground. Once again manually actuate the Eject Clamp Home Sensor. Does the voltage toggle between +5 VDC and 0 VDC? Yes No Measure the voltage at Eject Clamp Home Sensor pin 1 (gray). Does the voltage measure +5 VDC? Yes No Measure the voltage between the Finisher Control Board P849-6 (see figure page 2-46)and Finisher frame ground. Does the voltage measure +5 VDC? Yes No Replace the Finisher Control Board (RRP 77, on page 11-336). Repair or replace the wiring harness between the Finisher Control Board and the Eject Clamp Home Sensor. ABCD Phaser 7700 Color Laser Printer Service Manual 2-79
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