Xerox Phaser 840 Service Manual page 67

Table 2-4 Front Panel & Fault History Log Error Codes and Messages
Error code
07,004.46:
PM_FAULT_DM_CAM_
State_Error
***see SF165 & SF167***
7,004.46
Maintenance blade position
sensor (right I/O board) failed
to detect transitions of the
drum-maintenance
home flag
Observe drum-
maintenance home
flag motion while
turning on the printer
Does flag
rotate during power
on sequence?
Yes
Replace I/O
right board
07,005.47
PM_FAULT_DM_CAM_
POSITION_ERROR
07,006.48
PM_FAULT_DM_CAM
UNEXPECTED_MOTION
Definition
The Drum Maintenance home sensor did not actuate or change
state as expected. Run diagnostics to verify clutch and sensor
operation. Also verify that the shaft is properly assembled.
Check operation of the
No
compound gear, belt,
and drive train
The Drum Maintenance home sensor actuated, but not at the
expected time. Inspect the maintenance drawer lift pins for wear.
Run diagnostics to verify clutch and sensor operation. Also verify
that the drum maintenance shaft is properly assembled.
The Drum Maintenance home sensor actuated, when no motion
should have occurred. Run diagnostics to verify clutch and
sensor operation. Also verify that the shaft is properly assembled.
Does process
gear train rotate
smoothly?
Yes
Remove maintenance
drawer and inspect
drum-maintenance cam,
bushings, and
cam lifters
All parts
installed
correctly?
Yes
Replace (in this order):
• drum-maintenance clutch
• I/O board
• Power control board
Error Codes and Messages
No
Replace or reseat
gears; replace or
retension belt
No
Reinstall or
reseat the parts
0388-83
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