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Troubleshooting > Startup System Failure Diagnosis > Flow D: Low-voltage Power Supply (3.3V) System Flow > Status Check
Troubleshooting > Startup System Failure Diagnosis > Flow D: Low-voltage Power Supply (3.3V) System Flow > Status Check
Flow D: Low-voltage Power Supply (3.3V) System Flow
■
Status Check
If 3.3V is not supplied to J22 of the Main Controller 2, identify the location of failure
according to the flow.
●
Flow for narrowing down troubles
The following diagram shows the 3.3V power supply route.
AC driver PCB
Low-voltage
Power Supply Unit
DC
3.3V
J102
J1
J11
J110
Main Controller 2
J22
J113
DC
3.3V
J101
AC power
(e.g.115 V - 230 V)
AC power
(e.g.115 V - 230 V)
F-6-133
Identify the cause in the following flow:
The Low-voltage Power Supply(3.3V) is
not supplied to the Main Controllers.
No
Yes
- Failure of the AC driver PCB
No
Yes
No
Yes
- Failure of the Low-voltage Power Supply
No
Yes
No
Yes
No
Yes
(7)
No
Yes
Is the fuses
(FU101, FU201) of theAC driver PCB
disconnected?
No
- Replace
the host machine
Yes
(8)
(1)
(2)
(3)
(4)
(5)
(6)
Is there output of 3.3V
to the PCB side of J113 (pin 1) of
the AC driver PCB?
Is there input of 3.3V
to the PCB side of J110 (pin 1) of
the AC driver PCB?
Is there output of 3.3V
to the PCB side of J11 (pin 1) of the Low-voltage
Power Supply PCB?
Is there input of AC
power(e.g.115 V - 230 V) to the PCB side of J1
(pins 1 and 3) of the Low-voltage
Power Supply PCB?
Is there output of AC
power(e.g.115 V - 230 V) to the PCB side of J102
(pins 4 and 5) of the
AC driver PCB?
Is there input of AC
power(e.g.115 V - 230 V) to the PCB
side of J101 (pin 1) of the
AC driver PCB?
- Failure of Power Supply
Cord Base
- Failure of harness (disconnection)
between J113 of the AC driver PCB
and J22 of the Main Controller 2
- Failure of the Main Controller 2
- Failure of harness (disconnection) between
J110 of the AC driver PCB and J11 of the
Low-voltage Power Supply PCB
- Failure of the AC driver PCB
- Failure of harness (disconnection) between
J102 of the AC driver PCB and J1 of the
Low-voltage Power Supply PCB
- Failure of the Low-voltage Power Supply
Is the harness
between J102 of the AC driver
PCB and J1 of the Low-voltage Power
Supply PCB disconnected
/shorted?
- Failure of the
AC driver PCB
- Failure of the
AC driver PCB
F-6-134