Troubleshooting Other Symptoms - IBM 6400 series Maintenance Manual

Troubleshooting Other Symptoms

DANGER:
<3> Hazardous voltages are present in the printer with the power cord
connected to the power source. Switch off printer power and unplug the
printer power cord before proceeding.
<4> Do not connect or disconnect any communication port, teleport,
attachment connector, or power cord during an electrical storm.
<5> Power off the printer and disconnect the power cord before connecting
or disconnecting communication port, teleport, or attachment cable
connector.
Use standard fault isolation techniques to troubleshoot malfunctions that are
not indicated by display messages. These techniques are summarized
below:
1. Ask the operator to describe the problem.
2. Verify the fault by running a diagnostic printer test or by replicating
conditions reported by the user.
3. Look for a match in the General Symptom List that begins on page 67.
If you find a match, go to the troubleshooting procedure and follow the
numbered instructions.
4. If you do not find the symptom in the General Symptom List, use the
Half-Split Method to find the malfunction:
a. Start at a general level and work down to details.
b. Isolate faults to half the remaining system at a time, until the final half
66
is a field-replaceable part or assembly. (Troubleshooting aids are
listed on page 55.)
Troubleshooting