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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 Low-voltage Power Supply (3.3V) is being supplied.
If the Low-voltage Power Supply(12V) is activated, the Control Panel Backlight can be
activated.
If the power-on signal (3.3V) is supplied to the AC driver PCB(12V), the 12V can still
activate the Control Panel Backlight.
If the power-on signal is blocked, the AC driver PCB(12V) 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:
Low-voltage Power Supply (3.3V) System Flow
Flow F:
Connector Disconnection Flow
(Model Specific)
Flow C: Main Controller Analysis Flow
[Check points]
1.Activation of Main Controller 1 LED8
2.AC driver PCB J113 pin 3(12V)
Yes
No
No
No
Yes
Is the Control Panel LED
ON?
Is the Main Controller 1
LED8 ON?
No
Is 3.3V supplied
to the pin 1 of J113 on the
AC driver PCB?
1.Replace Main Controller 1
2.Replace Main Controller 2
Yes
Yes
At the time of startup,
does the LED of Main Controller
1 or 2 momentarily turn ON or do the fans
of the MainControllers rotate?
Yes
No
Yes
No
1.Turn OFF the main power switch of the host machine.
2.Disconnect and then connect the host machine.
3.Turn ON the main power switch of the host machine.
Flow B:
Control Panel 12V Check Flow
Is the Main Controller 2
LED5(12V) ON?
Flow E:
Low-voltage Power Supply (12V) System Flow
(2)
(3)
(4)
(5)
(1)
(2)
Flow B:
Control Panel 12V Check Flow
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