Xerox Phaser 8400 Service Manual page 78

Error Code Definition Table (Continued)
Error code
4,018.4x PC_DEV_FAULT_LATE_CLEAN_REQUEST
This fault code indicates a problem with the process control system. Declared if the
warm-up sequencer had determined a head clean operation was not needed, then the
printhead temperature dropped below the head-clean-needed threshold. This would
cause the printhead thermal tasks to say the head needed to be purged after all, even
though thermals were stabilized during warm-up state. Something may be wrong with a
heater.
4,024.4x:PC_DEV_FAULT_CAP_INIT_ FAILED
This fault code indicates a problem with the wiper. After homing the wiper it asks for it to
go to the PARK/LOCK position. If the wiper motion fails during mech init (mechanical
initialization) to go to the correct position this fault will occur.
4,025.4x: PC_DEV_FAULT_PM_INIT_ FAILED
This fault code indicates a problem with the process control system. After repeatedly
trying to home the head tilt mechanism, with the X-Axis in different positions, the printer
still cannot successfully home the drum maintenance transfix mechanism. Something
must be stuck or disconnected limiting the ability of the mechanism to go through the
required homing motion.
4,025.4x: (continued)
3-10
Definition
1. Verify the temperature of the room the printer is in is not
too low, refer to page 1-11 for the printer's optimal
operating environment.
2. If the temperature is too low, warm up the room.
3. Run the Exercise Heaters tests with all heaters on.
If a heater test fails:
1. Inspect the wiring harness to the failed heater.
2. Replace the problem component.
1. Run the Check Wiper Alignment test.
2. Run the Wiper Drive test.
3. Inspect the wiper drive system and wiper lock system
for proper operation.
4. Inspect the head maintenance clutch for the presence
of oil or contaminants.
5. Run the Head Maintenance Clutch test.
6. Replace the problem component.
1. Check for an obstruction around the printhead.
2. Ensure the wiring around the printhead is routed
properly.
3. Remove the waste tray and look for ink build-up in the
printer.
4. Check the process gearbox for damage. Ensure the
gears are correctly aligned. Replace the process
gearbox if damaged.
5. Run the X-Axis Motor test to check the X-Axis motor
current. Replace the X-Axis motor if the test fails.
6. Run the Tilt Drive test.
Phaser 8400 Color Printer