How To Troubleshoot; Printer Self-Test And Verifying Printer Operation - Printronix T4204 Maintenance Manual

Chapter 3

How To Troubleshoot

How To Troubleshoot
Standard fault isolation 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 Table 1 on page 30 or in Table 2 on page 39. If you
find a match, go to the troubleshooting procedure and follow the
instructions.
4. If you cannot find the symptom in a troubleshooting table, 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 printed circuit board assembly, sensor, or
cable that causes the fault indication.
6. Test printer operation after every corrective action. (See "Printer Self-Test
and Verifying Printer Operation" below.)
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.

Printer Self-Test And Verifying Printer Operation

The printer performs a sequence of automatic tests when it is powered up. If
self-test software detects a fault, an error message is displayed.
Always verify printer operation before returning it to normal operation. You
can verify printer operation by running the internal self-test diagnostic
program, which produces a selection of printed test labels. Use the test labels
and patterns to check print quality. (Refer to "Configuring the Printer," in the
User's Manual .)
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is a field-replaceable part or assembly.
VORSICHT