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Troubleshooting > Startup System Failure Diagnosis > Flow B: Control Panel 12V Check Flow
Troubleshooting > Startup System Failure Diagnosis > Flow B: Control Panel 12V Check Flow
Flow B: Control Panel 12V Check Flow
●
Control Panel 12V Check Flow
Is any one of them 0 ohm?
[Assumed failure location]
Short circuit of the cables
- Replace the AC driver PCB after
fixing the short circuit of the cables
[Assumed failure location]
AC driver PCB
- Replace the AC driver PCB
Has only
the backlight gone off?
(Can you hear the operation sound
of the Hard Key?)
Is 12V supplied to
C1005 of the Control Panel
CPU PCB?
Start
[Assumed failure location]
1. Control Panel CPU PCB
2. Main Controller PCB1
3. 12V Connector of the Control Panel
4. Control Panel Unit
Yes
No
Yes
No
No
Yes
Yes
Check the following resistances
of the AC driver PCB(J116):
- Between pin 3 (12V) and pin 4 (GND)
- Between pin 3 and the chassis
[Assumed failure location]
1. Control Panel Unit
2. 12V Connector of the Control Panel
3. Main Controller PCB1
Is 12V supplied to
J116(pin 3) of the
AC driver PCB?
Check the following resistance between
J1002 of the Control Panel CPU PCB and
J116 of the AC driver PCB:
- Between J1002(2 pin) and J116(3 pin)
- Between J1002(3 pin) and J116(4 pin)
Is any one of them
0 ohm?
[Assumed failure location]
Disconnection of the cable
- Replace the cables
[Assumed failure location]
Control Panel Unit
- Replace the Control Panel Unit
Yes
No
Disconnect the following connectors:
- J116 of the AC driver PCB
- J1002 of the Control Panel CPU PCB
No
Disconnect the following connectors:
- J1002 of the Control Panel CPU PCB
(1)
(2)
(3)
(4)
(6)
(5)
(7)
(2)
(2)
(2)
F-6-130
●
Check item
Item
Check item
Location
(1)
Control Panel
CPU PCB
C1005 (12V)
Tester
Check the 12V input to the
Control Panel CPU PCB (C1005)
(2)
Disconnect
and then
connect the 12V
Power Supply
Connector of the
Control Panel
Disconnect and then connect the
12V Connector of the Control Panel
J1002