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Power Supply Check
PWR indicator not lit.
Replace the CPU
Unit.
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?
(see note)
Correct the short circuit or limit
the connected load to the spec-
ification range
No
No
Is PWR indicator lit?
Yes
Yes
Note The PWR indicator will go out when there is a short circuit in the external power
supply or an overload, only in the CPM1A-10CDR-j and CPM1A-20CDR-j
CPU Units. In CPM1A-30CDR-j and CPM1A-40CDR-j CPU Units, when
there is a short circuit or a overload, the external power supply voltage will drop
but the PWR indicator will remain lit.
Troubleshooting Flowcharts
Section 5-6