Canon imageRUNNER ADVANCE C255 Series Service Manual page 390

E012-0002-05
Detection Description
Remedy
E012-0003-05
Detection Description
Remedy
CL Drum Motor error
The specified speed could not be detected for 500 consecutive msec although it became the
specified speed at least once from the startup of the CL Drum Motor in the Main Drive Unit.
[Related parts] R1.00
- Harness between the CL Drum Motor (M01/J5701) and the DC Controller PCB (UN04/J140)
- Fuse in the Low-voltage Power Supply PCB (UN01/FU14)
- CL Drum Motor (M01)
- Main Drive Unit
- Low-voltage Power Supply PCB (UN01)
- DC Controller PCB (UN04)
[Remedy] Perform the following in the order while checking whether the error is cleared.
1. Check whether the gears of the Main Drive Unit can be rotated by hand.
a. If they cannot be rotated, replace the Main Drive Unit.
b. If they can be rotated, check the harness between the CL Drum Motor and the DC Controller
PCB.
2. Measure the both ends of the fuse in the Low-voltage Power Supply PCB using a tester.
a. If power is flowing to it (the measurement value is less than 1 ohm),
1. Replace the CL Drum Motor.
2. Replace the DC Controller PCB.
b. If the power is not flowing to it (the measurement value is 1 ohm or higher), replace the Low-
voltage Power Supply PCB.
[Reference] Before replacing the DC Controller PCB, back up the service mode data (approx. 2
min) and restore the backup data after the replacement so the data may be able to be protected.
- Backup: COPIER (LEVEL2)> FUNCTION> SYSTEM> DSRAMBUP
- Restoration: COPIER (LEVEL2)> FUNCTION> SYSTEM> DSRAMRES
CL Drum Motor error
There was no FG signal input for 300 msec from the startup of the CL Drum Motor in the Main
Drive Unit.
[Related parts] R1.00
- Harness between the CL Drum Motor (M01/J5701) and the DC Controller PCB (UN04/J140)
- Fuse in the Low-voltage Power Supply PCB (UN01/FU14)
- CL Drum Motor (M01)
- Main Drive Unit
- Low-voltage Power Supply PCB (UN01)
- DC Controller PCB (UN04)
[Remedy] Perform the following in the order while checking whether the error is cleared.
1. Check whether the gears of the Main Drive Unit can be rotated by hand.
a. If they cannot be rotated, replace the Main Drive Unit.
b. If they can be rotated, check the harness between the CL Drum Motor and the DC Controller
PCB.
2. Measure the both ends of the fuse in the Low-voltage Power Supply PCB using a tester.
a. If power is flowing to it (the measurement value is less than 1 ohm),
1. Replace the CL Drum Motor.
2. Replace the DC Controller PCB.
b. If the power is not flowing to it (the measurement value is 1 ohm or higher), replace the Low-
voltage Power Supply PCB.
[Reference] Before replacing the DC Controller PCB, back up the service mode data (approx. 2
min) and restore the backup data after the replacement so the data may be able to be protected.
- Backup: COPIER (LEVEL2)> FUNCTION> SYSTEM> DSRAMBUP
- Restoration: COPIER (LEVEL2)> FUNCTION> SYSTEM> DSRAMRES
379
7. Error/Jam/Alarm