Canon imageRUNNER ADVANCE C255 Series, Service Manual, Page: 318 / 987

Actions at Parts Replacement
Main Controller PCB
How to Replace the Parts
See “Removing the Main Controller Unit” on page 189 to replace the Main Controller.
NOTE:
Transfer the following PCBs which were connected to the old Main Controller PCB to the new PCB.
• Memory PCB
• Flash PCB
• TPM PCB
CAUTION:
Do not transfer the following parts to another machine with a different serial number.
If the following parts are transferred to another machine, the machine will not start up normally, and may become
unrecoverable in some cases.
• Main Controller PCB
• Flash PCB
• TPM PCB
• Memory PCB
DC Controller PCB
How to Replace the Parts
See “Removing the DC Controller PCB” on page 194 to replace the PCB.
■ Before Parts Replacement
CAUTION:
When replacing the DC Controller PCB, be sure to use a new one. Do not use the DC Controller PCB which was used with
another machine.
1. Execute the following service mode to output setting values for just in case of restoration failure of backup data.
COPIER > FUNCTION > MISC-P > P-PRINT
2. Execute the following service mode to back up the service mode setting values.
(Lv.2) COPIER > FUNCTION > SYSTEM > DSRAMBUP
During execution, "ACTIVE" flashes in the status column of the service mode.
It takes approx. 2 minutes. Upon success, [OK!] is displayed in the status column.
3. After confirming that [OK!] is displayed in the status column of the service mode, turn OFF the power of the machine.
■ Works During Parts Replacement
1. When the setting value data is backed up before parts replacement, execute the following service mode to restore
the backed-up setting value data.
(Lv.2) COPIER > FUNCTION > SYSTEM > DSRAMRES
During execution, "ACTIVE" flashes in the status column of the service mode.
It takes approx. 2 minutes. Upon success, [OK!] is displayed in the status column.
2. When setting values cannot be backed up before replacement or when the backed-up data cannot be restored in
this step due to reasons such as damage of the DC Controller PCB, enter the values of each service mode item
written on the service label or P-PRINT before parts replacement.
5. Adjustment
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