General Symptom List - IBM 6400 series Maintenance Manual

Do not attempt field repairs of electronic components or assemblies.
Replace a malfunctioning electronic assembly with an operational
spare. Most electronic problems are corrected by replacing the printed
circuit board assembly, sensor, or cable that causes the fault
indication. The same is true of failures traced to the hammer bank:
replace the entire shuttle frame assembly. It is not field repairable.
5. Replace the defective part or assembly.
6. Test printer operation after every corrective action.
7. Reinstall any parts you replaced earlier that did not solve the problem.
8. Stop troubleshooting and return the printer to normal operation when the
reported symptoms disappear.
Communications Failures
CLEAR JAM message instead of LOAD
FORMS when printer is out of paper
CLEAR JAM message will not clear and
paper does not move
CLEAR JAM message will not clear but
paper moves
Black squares on operator panel display
Operator panel blank
Operator panel display shows garbled,
broken characters
Operator panel keys do not work
No power, and the operator panel is blank,
and the card cage fan is not running
Troubleshooting
IMPORTANT
Table 3. General Symptom List
Symptom
Jams
Operator Panel
Power / IML Failures
Troubleshooting
Procedure
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