Flow A: Execution Flow For Control Panel Startup Failure - Canon imageRUNNER ADVANCE C5255 Series Service Manual

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.
6
Troubleshooting > Startup System Failure Diagnosis > Flow A: Execution Flow for Control Panel Startup Failure > Status Check
6 Troubleshooting > Startup System Failure Diagnosis > Flow A: Execution Flow for Control Panel Startup Failure > Status Check
The Control Panel does not display
Check if the Leakage
Breaker is turned OFF
Does the
Yes
host machine start warm-up
rotation?
No
To Control Panel 12V Check Flow
(1)
Yes
Is the Control Panel LED
ON?
No
(2)
Yes
Is the Main Controller 1
LED9 ON?
No
To Control Panel 12V Check Flow
(3)
Yes
Is 3.3V supplied to the
Riser PCB C26?
No
Flow D :
To All-night Power Supply
(3.3V) System Flow
(4b)
Is 12V supplied to
Yes
Main Controller 1 and
Main Controller 2?
No
(4a)
(4a)
(4b)
At the time of startup,
does the LED of Main Controller Yes
1 or 2 momentarily turn ON
or do the fans of the Main
Controllers rotate?
No
Flow E :
To 12V Power Supply System Flow
6-109
Flow B :
Flow B :
Replace Main Controller 1
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)
Flow F :
To Connector Disconnection Flow
(Model Specific)
F-6-142
6-109