How to troubleshoot the 79:04 system error
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Introduction
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Possible causes
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Troubleshooting based on symptoms
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 pointed to by 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.
One important point to mention is 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. In these cases
the issue can only be solved by determining the root cause and implementing a solution. The solution can
usually be applied by either correctly configuring a selection, updating the printer’s firmware/software that is
being used or by fixing an error in the code).
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 SE 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:
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Incorrect commands in the job itself: for example, a PS job with some commands that do not have the
correct PS format
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Issues applying to the settings in the job
Cause
A system error 79:04 caused by a print job always has 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 displays the 79:04 system error again immediately after restart. This is because the printer
tries to reprint the job, which is pending in the queue, after restart.
4. After the second restart, the printer will start normally.
5. If the same job is sent again, it always produces a 79:04 system error.
These types of 79:04 system errors are normally caused by jobs that have been generated by third-party
applications (RIPs, third-party drivers, files exported by an application to PS, PDF, HP-GL/2, RTL, or any other
format supported by the printer). Jobs generated by HP drivers will not normally generate 79:04 system
errors, since the output that our drivers generate is under control and has been designed taking into
consideration the characteristics of our printer’s language interpreters.
ENWW How to troubleshoot the 79:04 system error 25
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