Xerox Phaser 7760 Service Manual page 299

012-243 Booklet Knife Home Sensor On Fail
Knife Home Sensor is not turned On after the lapse of 500ms from Clutch On while Booklet
Knife is returning to Home.
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 Clutch connectors for connection failure.
• Check the Knife Clutch 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. Run the Booklet Folder Roll
Motor test. 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
Perform the Knife Solenoid test (PL 21.22). 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
Block/unblock the Knife Home Sensor
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
If the problem continues, replace the Finisher PWB
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).
(Figure 1). The continuity check is OK.
(PL 21.12).
(PL 21.22). The display changed.
(Figure 1). The continuity check is OK.
21.22). If the problem continues, replace the Booklet
(PL 21.12).
(PL 21.12).
January 2010
2-263
Status Indicator RAP's
012-243