IBM 5150 Hardware Maintenance Manual page 144

Error
Description
1400
Printer
Entry
Diagnostic Action
6. Power off the Printer and the System Unit.
Disconnect the signal cable at the Printer
and System Unit. Run the Offline
Diagnostic Test (see page 1400-33).
Does the printer fail to print?
YES:
Go to page 1400-11, "No Printing."
NO: Compare printout with one below.
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Any errors?
YES: Go to page 1400-5, "Failure
Symptom" chart. Proceed to the
corresponding page and follow each
step in PIC procedure until failing
FRU is isolated.
«I
NO: Go to step 7.
1400-3