Flow D: All-Night Power Supply (3.3V) System Flow - Canon imageRUNNER ADVANCE C5255 Series Service Manual

Flow D: All-night Power Supply (3.3V) System Flow

■ Status Check
Disconnect J413 of the Relay PCB and, if 3.3V is not supplied to the yellow and blue Lead
Wires, identify the location of the failure according to the flow.
● Flow for narrowing down troubles
The following diagram shows the 3.3V power supply route.
AC driver PCB
J1014
AC power
(e.g.115 V - 230V)
6
Troubleshooting > Startup System Failure Diagnosis > Flow D: All-night Power Supply (3.3V) System Flow > Status Check
All-night power
Relay PCB
supply PCB(3.3V)
DC
J413
J691
3.3V
6 Troubleshooting > Startup System Failure Diagnosis > Flow D: All-night Power Supply (3.3V) System Flow > Status Check
Identify the cause in the following flow:
The All-night Power Supply (3.3V) is not
supplied to the Main Controllers.
(1)
1.Turn OFF the Main Power Supply Switch
2.Disconnect J413 of the Relay PCB
3.Turn ON the Main Power Supply Switch
Do the yellow and blue
Lead Wires on the Connector Terminal
F-6-145
side have 3.3V output?
(2)
Disconnect J1014 of the AC Driver
Is the AC voltage
AC power(e.g.115 V - 230V)
or more between pins 1 and pins 4
on the PCB side
of J1014?
- Check if the Leakage Breaker is
turned OFF
- Failure of the AC Driver
Yes
- Failure of the Main Controller
- Failure of the Relay PCB
No
- Harnesses between the All-night Power
Supply and Relay PCB are trapped
- The harness of the Relay PCB/Riser
PCB is trapped
Yes
No
Failure of the All-night Power Supply
6-116
F-6-146
6-116