Xerox Phaser 7700 Service Manual page 100

Error Chain /
Code Link
117 12-255 FINISHER ERROR 117 STACKER TRAY FAILURE (Continued)
While watching the display, interrupt the Stack A and Stack B sensors.
Does the display indicate H & L for both sensors?
Yes No
Does the display indicate H & L for one sensor?
Yes No
Replace the Finisher Controller Board (RRP 77, on page 11-316).
Address the following components/assemblies in order:
• The unresponsive sensor.
• The Finisher Control Board (RRP 77, on page 11-316).
• The wiring harness between the sensors and the Finisher Control Board.
Replace the Engine Control Board (RRP 42, on page 7-190) in the printer.
118 12-256 FINISHER ERROR 118 STAPLER FRONT CORNER SENSOR
ON FAILURE
119 12-257 FINISHER ERROR 119 STAPLER FRONT CORNER SENSOR
OFF FAILURE
Open the Front Door.
Defeat the Front Door Interlock.
Enter Service Diagnostics Mode.
From the "Motors/Fans Tests / Finisher Motors / Stapler Move Motor" test menu, select "Move
Front" to move the Stapler to the front of the Finisher.
From the Main Menu, select "Sensor Tests/Finisher Sensors/Stacker."
Manually move the Stapler Assembly so as to interrupt the Stapler Front Corner Sensor.
Does the Front Panel LCD show "Front Corner" 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 P850A-2 (see figure page 3-47)
and Finisher frame ground.
Again manually move the Stapler Assembly so as to interrupt the Stapler Front Corner
Sensor.
Does the voltage toggle between +5 VDC and 0 VDC?
Yes No
Remove the Finisher Front Cover (RRP 72, on page 11-310).
Measure the voltage at the Front Corner Sensor pin 2 (yellow) and Finisher frame
ground.
Once again manually move the Stapler Assembly so as to interrupt the
Stapler Front Corner Sensor.
A B C
Service Quick Reference Guide - Diagnostics, Error Codes & Messages
Front Panel Message
2-77