5 - 3
Failure Investigation
for Electronic Parts
Failure Investigation for Electronic Parts
The power is not turned on.
• The power is not turned on
or
•
Nothing is displayed on the liquid crystal display (LCD).
Connect it properly.
N
Y
Change power cords.
Is the resistance between the two terminals at
both ends 1 Ω or below when the power cord
is removed from the plug outlet and the inlet?
N
Y
Connect them properly.
Are relay connectors for leads A and B on
the panel properly connected to each other?
N
Y
Is the power cord properly
connected to both the inlet and the
plug outlet?
Connect it properly.
Is connector CN21 on the main
PCB properly connected?
N
Y
Is lead B on the panel properly connected
to connector CN10 on the main PCB?
Y
Connect it properly.
N
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Connect it properly.
N
Is the voltage between pins 1 and 2, and 3 and 4
of connector CN21 on the main PCB 38.0 - 42.0V,
22.8 - 26.4V, respectively, when the power is ON?
N
Is the power lead properly connected to
connector CN101 on the power PCB and
the power switch's fasten tab terminal?
Y
Y
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