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Troubleshooting Flowcharts
Power Supply Check
134
PWR indicator not lit.
No
Is power being
supplied?
Yes
No
No
Is voltage adequate?
Yes
No
Are there any loose
Yes
terminal screws or bro-
ken wires?
No
No
Has the external
Yes
power supply shorted
or overloaded?
No
No
Replace the CPU
Unit.
Section
Connect power
supply.
Yes
Is PWR indicator lit?
Set supply voltage
within acceptable limits.
Yes
Is PWR indicator lit?
Tighten screws or
replace wires.
Yes
Is PWR indicator lit?
Correct the short circuit or limit
the connected load to the spec-
ification range.
Yes
Is PWR indicator lit?
5-5
End
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