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7-4SectionTroubleshooting Flowcharts
119
Power Supply Check
PWR indicator not lit.
Replace the CPU
Board.
Is power being
supplied?
Is voltage adequate?
Are there any loose
terminal screws or bro-
ken wires?
Connect power
supply.
Is PWR indicator lit?
Set supply voltage
within acceptable limits.
Is PWR indicator lit?
Tighten screws or
replace wires.
End
Yes
No
No
Yes
Yes
No
No
No
Is PWR indicator lit?
Yes
No
Yes
Yes
Has the external
power supply shorted
or overloaded?
Correct the short circuit or limit
the connected load to the spec-
ification range.
No
No
Is PWR indicator lit?
Yes
Yes