Xerox Phaser 7760 Service Manual page 388

024-930 Finisher Stacker Tray Full Stack (Large Size Full)
Stacker No Paper Sensor On was detected during the Stacker Tray height adjusting operation.
Initial Actions
• Check the Stacker No Paper Sensor for improper installation.
• Check the Stacker No Paper Sensor connectors for connection failure.
• Check the Elevator Motor for operation failure.
• Check the Elevator Motor connectors for connection failure.
Caution must be used when activating the Elevator Motor test. When activating this test in the
Down position, there is no limit sensor for downward Stacker travels.
Downward steps increment (or decrement) in single steps, not 5. When continuing in the Down
direction, DO NOT continue after an initial thump sound is heard.
Further downward movements may cause damage to the Stacker Unit/Finisher.
Procedure
Enter Service Diagnostics Menu: Printer Menu > Troubleshooting > Service Tools > Printer
Status Page > hold the Up and Down buttons simultaneously > Run Service Diagnostics >
OK. Perform the Elevator Motor test alternately. The Elevator Motor
Y N
Check continuity between the Elevator Motor and Finisher PWB
ity check is OK.
Y N
Repair the open circuit or short circuit.
Replace the Elevator Motor (PL 21.4). If the problem continues, replace the Finisher PWB
(PL 21.12).
Block/unblock the Stacker No Paper Sensor
Y N
Check continuity between the Stacker No Paper Sensor and Finisher PWB
The continuity check is OK.
Y N
Repair the open circuit or short circuit.
Replace the Stacker No Paper Sensor
Finisher PWB (PL 21.12).
Block/unblock the Stacker Encoder Sensor
Y N
Check continuity between the Stacker Encoder Sensor and Finisher PWB
continuity check is OK.
Y N
Repair the open circuit or short circuit.
Replace the Stacker Encoder Sensor
isher PWB (PL 21.12).
If the problem continues, replace the Finisher PWB
Status Indicator RAP's
024-930
CAUTION
(PL 21.4) energizes.
(Figure 1). The continu-
(PL 21.4). The display changes.
(PL 21.4). If the problem continues, replace the
(PL 21.4). The display changes.
(Figure
(PL 21.4). If the problem continues, replace the Fin-
(PL 21.12).
(Figure 1).
1). The
January 2010
2-352
Revised
Phaser 7760 Color Laser Printer