Canon imageRUNNER ADVANCE C255 Series, Service Manual, Page: 402 / 987

E025-0468-05 No toner detection error (Bk)
Detection Description - The state without toner was detected although the recovery sequence was performed for 5 times
after replacement of the Toner Container (Bk).
- The recovery sequence was repeated with no toner in the container.
Remedy
[Related parts] R1.00
- Main Drive Unit
- Hopper Unit (Bk)
- Toner Bottle Mount Unit (Bk)
- Drum Unit (Bk)
- Toner Container (Bk)
[Remedy] Be sure to perform the following procedure.
1. Shake the Toner Container 10 times, and then insert it into the host machine.
2. Check/replace the related harness/cable, connector and parts.
[Reference] If a user inserts an empty Toner Container (Bk) repeatedly, the error may occur.
E029-5008-05 Registration Patch Sensor (Front) light intensity error
Detection Description The background regular reflection output of the Registration Patch Sensor at the front side did not
fall within the specified range for 2 consecutive times at initialization.
Remedy [Related parts] R1.00
- Harness between the DC Controller PCB (UN04/J170) and the Registration Patch Sensor Unit
(Front) (UN31/J5603)
- Registration Patch Sensor Unit (Front) (UN31)
- Registration Patch Sensor Unit (Front) Shutter
- Registration Shutter Solenoid (SL03)
- DC Controller PCB (UN04)
[Remedy] Perform the following in the order while checking whether the error is cleared.
Check the background regular reflection output value (front) in COPIER (level 2)> DISPLAY>
DENS> P-B-P-C.
a. If the value is less than 10,
1. Check if the sensor window of the Registration Patch Sensor Unit (Front) is soiled. If it is soiled,
clean it with a blower.
2. Check that the Registration Patch Sensor Unit (Front) Shutter is properly installed and it is not
damaged or deformed.
If it is deformed or damaged, replace the Registration Patch Sensor Unit (Front).
3. Check the operation of the Registration Shutter Solenoid.
3-1. If the Registration Shutter Solenoid moves,
3-1-1. Replace the Registration Patch Sensor Unit (Front).
3-1-2. Replace the DC Controller PCB.
3-2. If the solenoid does not move, replace the Registration Shutter Solenoid.
b. If the value is above 250,
1. Check the harness between the Registration Patch Sensor Unit (Front) and the DC Controller
PCB.
2. Replace the harness between the Registration Patch Sensor Unit (Front) and the DC Controller
PCB.
3. Replace the Registration Patch Sensor Unit (Front).
4. Replace the DC Controller 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
7. Error/Jam/Alarm
391