Appendix A: How to troubleshoot system error 79:04 and
79.2:04
Introduction
The system error 79:04 is a generic firmware error (equivalent to a blue screen in Windows). It’s the system
error that the printer will display when an unknown exception occurs that cannot be identified as relating to
any specific subsystem of the printer.
Since this is a generic error, there can be multiple causes behind it. This document will cover the most
probable causes behind a system error 79:04 and will recommend the most efficient troubleshooting steps
to resolve customer issues.
It is important to mention that, although 79:04 system errors can be caused by a hardware malfunction, the
vast majority of 79:04 system errors are pure software or firmware issues. Before doing anything else, you
are recommended to try the following general-purpose solutions.
1. Update the printer’s firmware to the very latest available firmware version, even if the printer appears
to be running the latest firmware already.
2. Restore the factory settings from the front panel's Setup menu.
If these do not solve the problem, continue reading about other possible solutions below.
Possible causes
Since the 79:04 system error is a generic error, the number of possible causes behind it is large. The majority
can be grouped, however, into the following groups.
Job-related 79:04
A specific print job that is not correctly formatted for the printer or that is not correctly processed by it can
trigger a 79:04 system error.
The incorrect format or processing can come from two sources:
●
Incorrect commands in the job itself. For example, a PS job with some commands that do not have the
correct PS format.
●
Issues applying to the settings in the job
Symptoms
79:04 errors caused by a print job always have the same symptoms:
1. The job is received by the printer and starts to process.
2. In the middle of the processing, the printer stops and displays 79:04.
3. The printer will display the 79:04 system error again after restart. This is due to the fact that the printer
will try to reprint the job, which is pending in the queue, after restart.
ENWW Appendix A: How to troubleshoot system error 79:04 and 79.2:04 143
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