Xerox Phaser 7700 Service Manual page 106

Error Chain /
Code Link
123 12-281 FINISHER ERROR 123 SET CLAMP 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 operate the Set Clamp Solenoid [see illustration in (RRP 75, on page 11-314) or
(RRP 75, on page 11-314).
Rotate the Set Clamp Shaft (above the solenoid to enable manual operation of the Set Clamp
Home Sensor) and observe the display for toggling between H and L of the Set Clamp Home
Sensor.
Does the display toggle between H & L?
Yes No
Remove the Board Cover (RRP 72, on page 11-310).
Measure the voltage between the Finisher Control Board P849-8 (see figure page 3-47)
and Finisher frame ground.
Rotate the Set Clamp Shaft (above the solenoid to enable manual operation of the
Set Clamp Home Sensor) and observe the display for toggling between H and L of
the Set Clamp Home Sensor.
Does the voltage toggle between +5 VDC and 0 VDC?
Yes No
Measure the voltage at the Set Clamp Sensor pin 2 (yellow) and Finisher frame
ground.
Rotate the Set Clamp Shaft (above the solenoid to enable manual operation
of the Set
Clamp Home Sensor) and observe the display for toggling between H and L
of the Set
Clamp Home Sensor.
Does the voltage toggle between +5 VDC and 0 VDC?
Yes No
Measure the voltage at Set Clamp Sensor pin 1 (gray).
Does the voltage measure +5 VDC?
Yes No
Measure the voltage between the Finisher Control Board P849-9
(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 Front Corner Sensor.
A B C D
Service Quick Reference Guide - Diagnostics, Error Codes & Messages
Front Panel Message
2-83