Canon imageRUNNER ADVANCE C5255, Service Manual, Page: 647 / 1443

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Troubleshooting > Startup System Failure Diagnosis > Flow A: Execution Flow for Control Panel Startup Failure > Status Check
Troubleshooting > Startup System Failure Diagnosis > Flow A: Execution Flow for Control Panel Startup Failure > Status Check
Flow A: Execution Flow for Control Panel Startup
Failure
■ Status Check
If nothing is displayed on the Control Panel when the power of the host machine is turned
ON, identify the location of the failure according to the flow.
● Flow for narrowing down troubles
If the Main Power LED is ON, the All-night Power Supply (3.3V) is being supplied.
If the 12V Power Supply is activated, the Control Panel Backlight can be activated.
If the power-on signal (3.3V) is supplied to the 12V Power Supply, the 12V can still activate
the Control Panel Backlight.
If the power-on signal is blocked, the 12V Power Supply stops supplying power.
If the Main Controller LED is momentarily activated or the fan momentarily rotates and then
stops after the Main Power SW is turned ON, the overcurrent protection may be active and
stopping the supply of power.
Consult this flow when checking the 3.3V and 12V power supplies and identifying the
location of the failure in "Execution Flow for Control Panel Startup Failure" described below.
The Control Panel does not display
Does the
host machine start warm-up
rotation?
Flow D :
To All-night Power Supply
(3.3V) System Flow
Flow E :
To 12V Power Supply System Flow
Flow F :
To Connector Disconnection Flow
(Model Specific)
Flow C : To Main Controller Analysis Flow
[Check points]
1. - Activation of Main Controller 1 LED9
- Activation of Main Controller 2 LED4
2. RISER PCB J104 pins 1 - pins 4(12V)
Yes
No
No
No
Yes
Is the Control Panel LED
ON?
Is the Main Controller 1
LED9 ON?
No
Is 3.3V supplied to the
Riser PCB C26?
Replace Main Controller 1
Yes
At the time of startup,
does the LED of Main Controller
1 or 2 momentarily turn ON
or do the fans of the Main
Controllers rotate?
Is 12V supplied to
Main Controller 1 and
Main Controller 2?
Yes
No
Yes
(1)
(3)
(2)
No
(4b)
Check if the Leakage
Breaker is turned OFF
Flow B :
To Control Panel 12V Check Flow
Flow B :
To Control Panel 12V Check Flow
(4a)
(4b)
(4a)
Yes
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