Canon imageCLASS LBP325dn Service Manual page 103

4. Turn OFF the power, and remove the faulty Main Controller PCB and the Sublog Board to which data was exported.
CAUTION:
Since data cannot be migrated to a Main Controller PCB that has been used before, connect an unused Main Controller
PCB to the Sublog Board and Expansion ROM PCB where the data has been backed up (exported to) before installing it
to the machine.
A Main Controller PCB that has been connected to a machine and powered ON even once becomes a used PCB.
Restoration Procedure (Import)
1. Connect the Sublog Board with the Expansion ROM for servicing which has data exported, to an unused Main
Controller PCB.
2. Install the unused Main Controller PCB to the machine, and turn ON the power.
3. Perform the following operation to write the information saved in the Sublog Board back to the machine.
1. Press the right arrow key on the Control Panel.
2. Select [NVRAM import].
3. Press the down arrow key.
4. If the import processing completes without a problem, the data saved on the Sublog Board is deleted and the
following message is displayed.
CAUTION:
If the Main Controller PCB has not been replaced with an unused Main Controller PCB, the following message is displayed
and the operation stops. In this case, turn OFF the power, and replace the Main Controller PCB with an unused Main
Controller PCB.
5. Turn OFF the power and remove the Sublog Board.
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3. Technical Explanation (System)