IBM 6400 Maintenance Information Manual page 113

Symptom
Operator panel keys do
not work
Table 5. General Symptom List
1. Power on the printer. Check the operation of the operator panel
keys. Replace the operator panel if keys do not work.
2. Power on the printer. Check the operation of the operator panel
keys. Replace the operator panel cable assembly if keys do not
work.
3. Power on the printer. Check the operation of the operator panel
keys. Replace the CMX controller board if the keys do not work.
General Symptom List
Corrective Action
113