Xerox Phaser 7700 Service Manual page 104

Error Chain /
Code Link
122 12-267 FINISHER ERROR 122 DECURLER FAILURE
Remove the Finisher Rear Cover (RRP 72, on page 11-310).
Enter Service Diagnostics Mode.
From the Main Menu, select "Sensor Tests/Finisher Sensors/Miscellaneous
Manually rotate the Decurler Cam Shaft such that the photo interrupter toggles the Decurler
Cam Home Sensor.
Does the display indicate the Decurler Cam Home Sensor toggling between H & L?
Yes No
Remove the Rear Cover and the Board Cover (RRP 72, on page 11-310).
Measure the voltage between the Finisher Control Board P849-2 (see figure page 3-47)
and Finisher frame ground.
Again manually rotate the Decurler Cam Shaft such that the photo interrupter toggles the
Decurler Cam Home Sensor.
Does the voltage toggle between +5 VDC and 0 VDC?
Yes No
Measure the voltage at the Decurler Cam Home Sensor pin 2 (yellow) and Finisher
frame ground.
Once again manually rotate the Decurler Cam Shaft such that the photo interrupter
toggles the Decurler Cam Home Sensor.
Does the voltage toggle between +5 VDC and 0 VDC?
Yes No
Measure the voltage at Decurler Cam Home Sensor pin 1 (gray).
Does the voltage measure +5 VDC?
Yes No
Measure the voltage between the Finisher Control Board P849-3
(see figure page 3-47) and Finisher frame ground.
Does the voltage measure +5 VDC?
Yes No
Replace the Finisher Control Board (RRP 77, on page 11-316).
Repair or replace the wiring harness between the Finisher Control
Board and the Decurler Cam Home Sensor.
A B C D
Service Quick Reference Guide - Diagnostics, Error Codes & Messages
Front Panel Message
2-81