Removing The Main Controller Pcb; After Replacing The Main Controller Pcb; Low-Voltage Power Supply Assembly; Before Removing The Low-Voltage Power Supply Assembly - Canon LBP5050 Series Service Manual

1) Remove the right cover. (page 3-2)[Removing the Right Cover]

3.1.13.2 Removing the Main Controller PCB

LBP5050N / LBP5050
1) Remove the 2 flat cables [1] and disconnect the connector [2].
2) Free the harness [4] from the guide [3].
3) Remove the main controller PCB [5].
- 4 screws [6]
[4]

3.1.13.3 After Replacing the Main Controller PCB

LBP5050N / LBP5050
The settings and management data of host machine is saved in the NVRAM
(IC2S) of the main controller PCB. When replacing the main controller PCB,
be sure to move the NVRAM from the old PCB and to the new PCB.
After moving the NVRAM, execute color displacement correction and cali-
bration.
1) Turn on the power supply of the host machine.
2) Start the Status window.
3) Execute Option Menu > Utility > Out-of-Register Colors Correction in the
status window.
4) Execute Option Menu > Utility > Calibration in the status window.
The information in the NVRAM on the DC controller PCB is saved in
the
NVRAM (IC2S) as backup data.
When replacing the NVRAM, perform the same operation as replacing
the
main controller PCB and execute the following item; Option Menu >
Service Mode > Printer Information settings > DCON data back up.

3.1.14 Low-Voltage Power Supply Assembly

3.1.14.1 Before Removing the Low-Voltage Power Supply
Assembly
LBP5050N / LBP5050
1) Remove the right cover. (page 3-2)[Removing the Right Cover]
2) Remove the rear side cover. (page 3-1)[Removing the Rear Side Cover]
3) Remove the rear door. (page 3-1)[Removing the Rear Door]
4) Remove the main controller PCB. (page 3-11)[Removing the Main Con-
troller PCB]
3.1.14.2 Removing the Low-Voltage Power Supply
Assembly
LBP5050N / LBP5050
1) Remove the fixing power supply cover [1].
- 2 screws [2]
[6] [1]
[6]
[5]
[3] [6] [2]
F-3-47
T-3-2
0019-0205
2) Disconnect the connector [1] and free the harness [3] from the guide [2].
0019-4759
3) Free the claw [1] and remove the guide [2] in the direction of the arrow.
0018-7561
0018-7562
4) Disconnect the 2 connectors [1].
[1]
F-3-48
[2]
[3] [1]
F-3-49
[2]
[1]
F-3-50
Chapter 3
[2]
3-11