Xerox Phaser 7760 Service Manual page 312

012-265 Booklet Knife Home Sensor Off Fail
When the Booklet Knife moves from Home position, the Knife Home Sensor did not turn Off
within the specified time after Knife Solenoid On.
Initial Actions
• Check the Knife Home Sensor for improper installation.
• Check the Knife Home 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. Perform the Booklet Folder Roll
Motor test 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 the 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 the Finisher PWB
Enter Service Diagnostics Menu. Block/unblock the Knife Folding Sensor
display changed.
Y N
Check continuity between the Knife Folding 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 Folding Sensor (PL
let PWB (PL 21.12). If the problem persists, replace the Finisher PWB
A
Status Indicator RAP's
012-265
Service Diagnostics Menu: Printer
(PL 21.22) energizes.
(Figure 1). The continuity check is
(PL 21.22). If the problem continues, replace the
(PL
(PL 21.22). The Knife Solenoid
(Figure 1). The continuity check is OK.
(PL 21.12).
(PL 21.18). The
(Figure 1). The continuity check is OK.
21.18). If the problem continues, replace the Book-
(PL 21.12).
A
If the problem continues, replace the Finisher PWB
21.12).
January 2010
2-276
(PL 21.12).
Revised
Phaser 7760 Color Laser Printer