Troubleshooting Other Symptoms - Printronix T4204 Maintenance Manual

Chapter 3

Troubleshooting Other Symptoms

Troubleshooting Other Symptoms
Use standard fault isolation techniques to troubleshoot malfunctions 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 below. If you find a
match, go to the troubleshooting procedure and follow the numbered
instructions.
4. If you cannot 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
WARNING
Always disconnect the AC power cord from the printer before doing a
maintenance procedure. Failure to remove power could result in injury
to you or damage to equipment. If you must apply power during
maintenance, you will be instructed to do so in the maintenance
procedure.
Bevor Sie anfällige Wartungsarbeiten durchführen, müssen Sie zuerst
immer das Netzkabel aus der Steckdose ziehen. Wird das Netzkabel
nicht herausgezogen, können Verletzungen oder Geräteschäden
entstehen. Falls die Wartungsarbeit Stromzufuhr erfordert, wird im
Wartungsablauf darauf hingewiesen.
5. Replace the defective part or assembly. Do not attempt field repairs of
electronic components or assemblies. Most electronic problems are
corrected by replacing the circuit board, sensor, or cable that causes the
fault indication.
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.
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is a field-replaceable part or assembly.
VORSICHT