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Troubleshooting Flowcharts Section 8-8
Fatal Error Check The following flowchart can be used to troubleshoot fatal errors that occur
while the Power indicator is lit.
Identify the error, eliminate
its cause, and clear the er-
ror.
Is the ERR/ALM
indicator lit?
Determine the cause
of the error with a
Peripheral Device.
End
RUN indicator not lit.
Replace the CPU
Unit.
Is PC mode displayed
on Peripheral Device?
Correct the power
supply.
Switch to RUN or
MONITOR mode.
No
Ye s
Is a fatal error
displayed?
Is PC mode displayed
on Peripheral Device?
No
Ye s
Ye s
No
Is the RUN indi-
cator lit?
No
Ye s
Ye s
No
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