Xerox Phaser 7760 Service Manual page 307

012-261 Booklet Knife Folding Sensor Fail
When the Booklet Knife performs folding operation, the Knife Folding Sensor did not turn On
within 400 msec. after Knife Solenoid On.
Initial Actions
• Check the Knife Folding Sensor for improper installation.
• Check the Knife Folding Sensor connectors for connection failure.
• Check the Booklet Fold Motor connectors for connection failure.
• Check the Knife Solenoid connectors for connection failure.
• Check the Knife Solenoid for improper installation.
• Check the Knife drive mechanism for a foreign substance.
Procedure
Manually move the Booklet Tamper to both ends. Enter
Menu > Troubleshooting > Service Tools > Printer Status Page > hold the Up and Down
buttons simultaneously > Run Service Diagnostics > OK. Actuate the Booklet Folder Roll
Motor alternately. The Booklet Folder Roll Motor
Y N
Check continuity between the Booklet Folder Roll Motor and the Booklet PWB and
between the Booklet PWB and the Finisher PWB
OK.
Y N
Repair the open circuit or short circuit.
Replace the Booklet Folder Roll Motor
Booklet PWB (PL 21.12). If the problem persists, replace Finisher PWB
Enter Service Diagnostics Menu. Check the Knife Solenoid
actuates.
Y N
Check continuity between the Knife Solenoid and the Booklet PWB and between the
Booklet PWB and the Finisher PWB
Y N
Repair the open circuit or short circuit.
Replace the Knife Solenoid (PL 21.22). If the problem continues, replace the Booklet
PWB (PL 21.12). If the problem persists, replace Finisher PWB
Enter Service Diagnostics Menu. Block/unblock the Knife Home Sensor
play changed.
Y N
Check continuity between the Knife Home Sensor and the Booklet PWB and between the
Booklet PWB and the Finisher PWB
Y N
Repair the open circuit or short circuit.
Replace the Knife Home Sensor (PL
PWB (PL 21.12). If the problem persists, replace Finisher PWB
A
Revised
Phaser 7760 Color Laser Printer
Service Diagnostics Menu: Printer
(PL 21.22) energizes.
(Figure 1). The continuity check is
(PL 21.22). If the problem continues, replace the
(PL 21.12).
(PL 21.22). The Knife Solenoid
(Figure 1). The continuity check is OK.
(PL 21.12).
(PL 21.22). The
(Figure 1). The continuity check is OK.
21.22). If the problem continues, replace the Booklet
(PL 21.12).
A
If the problem continues, replace the Finisher PWB
dis-
January 2010
2-271
(PL 21.12).
Status Indicator RAP's
012-261