Xerox Phaser 7700 Service Manual page 90

Error Chain /
Code Link
54 10-398 ERROR 54 FAN FAILURE
Enter Service Diagnostics Mode.
Run the "Fuser Fan" test.
Does the Fuser Fan operate?
Yes No
Remove the Rear Cover (RRP 1, on page 7-140), Rear Shield (RRP 9, on page 7-149)
and the Rear Shield Bracket (RRP 11, on page 7-151).
Measure the voltage between P530-1 (see figure page 3-47) on the Engine Control
Board and frame ground.
Does the voltage measure +24 VDC?
Yes No
Replace the Engine Control Interface Board (RRP 43, on page 7-191).
Measure the voltage between P530-4 (see figure page 3-47) on the Engine Control
Board and frame ground.
Does the voltage measure 0 VDC?
Yes No
Replace the Engine Control Interface Board (RRP 43, on page 7-191).
Measure the voltage between P530-3 (see figure page 3-47) on the Engine Control
Board and frame ground.
Does the voltage measure +5 VDC?
Yes No
Replace the Engine Control Board (RRP 42, on page 7-190).
If the problem persists, repair or replace the harness between Engine Control
Board and the Fuser Fan.
Replace the Fuser Fan Assembly (RRP 34, on page 7-179).
Remove the Rear Cover (RRP 1, on page 7-140), Rear Shield (RRP 9, on page 7-149) and
the Rear Shield Bracket (RRP 11, on page 7-151).
Measure the voltage between P530-5 (see figure page 3-47) on the Engine Control Board and
frame ground.
Does the voltage measure +24 VDC?
Yes No
Replace the Engine Control Interface Board (RRP 43, on page 7-191).
Measure the voltage between P530-8 (see figure page 3-47) on the Engine Control Board and
frame ground.
Does the voltage measure 0 VDC?
Yes No
Replace the Engine Control Interface Board (RRP 43, on page 7-191).
Measure the voltage between P530-7 (see figure page 3-47) on the Engine Control Board and
frame ground.
Does the voltage measure +5 VDC?
Yes No
Replace the Engine Control Board (RRP 43, on page 7-191).
If the problem persists, repair or replace the harness between Engine Control Board
and the +24 VDC LVPS Fan.
Replace the +24 VDC LVPS Fan (RRP 47, on page 7-196).
Service Quick Reference Guide - Diagnostics, Error Codes & Messages
Front Panel Message
2-67