Flow B: Control Panel 12V Check Flow - Canon imageRUNNER ADVANCE C5255 Series Service Manual

Flow B: Control Panel 12V Check Flow

● Control Panel 12V Check Flow
Start
Has only
the backlight gone off?
(Can you hear the operation sound
of the Hard Key?)
No
(1)
Is 12V supplied to C1005
of the Control Panel CPU PCB?
No
Turn OFF the Main Power Supply Switch
(5)
Is the FU4 of the
Relay PCB disconnected?
Yes
Disconnect the following connectors:
(4)
- J427 of the Relay PCB
(2)
- J1002 of the Control Panel CPU PCB
(2)
Check the following resistances of the
cables connected to J1002 of the
Control Panel CPU PCB:
- Between pins 2 (orange) and pins 3 (blue)
- Between pins 2 and the chassis
Is any one of them 0 ohm?
Yes
[Assumed failure location]
1. Short circuit of the cables
Replace the Relay PCB after fixing
the short circuit of the cables
6
Troubleshooting > Startup System Failure Diagnosis > Flow B: Control Panel 12V Check Flow
Yes
[Assumed failure location]
1. Control Panel Unit
(2)
2. 12V Connector of the Control Panel
3. Main Controller PCB1
Yes
[Assumed failure location]
(3) 1. Control Panel CPU PCB
2. Main Controller PCB1
3. 12V Connector of the Control Panel
(2)
4. Control Panel Unit
No
[Assumed failure location]
(6)
1. Disconnect the following connectors:
- J427 of the Relay PCB
- J1002 of the Control Panel CPU PCB
2.Check the conduction of the cables
between J427 and J1002
3. Relay PCB
No
[Assumed failure location]
1. Control Panel Unit
Replace the Control Panel Unit and
the Relay PCB
6 Troubleshooting > Startup System Failure Diagnosis > Flow B: Control Panel 12V Check Flow
● Check item
Item Check item
(1) Control Panel
CPU PCB
C1005 (12V)
F-6-143
6-111
Location
Check the 12V
input to the Control
Panel CPU PCB
(C1005)
Tester
6-111