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HP Designjet T Series — Service Manual 2-34
Appendix A: How to troubleshoot SE 79:04
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 SE79:04
A specific print job that is not correctly formatted for the printer or that is not
corr
ectly 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
Possible symptoms
79:04 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 immediately after
r
eboot. This is due to the fact that the printer will try to reprint the job, which
is pending in the queue, after reboot.
4 A
fter the second reboot, the printer will start up normally
5 If the same job is sent again, it will always produce a 79:04 system error
T
hese types of 79:04 system errors are normally caused by jobs that have
been generat
ed by 3rd party applications (RIPs, 3rd 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
very controlled and has been designed taking into consideration the
characteristics of our printer’s language interpreters.
There is an exception to this general rul
e
: there are certain applications that
can generate their own PS code (Adobe PhotoShop, Adobe Illustrator,
Adobe Acrobat, Corel Draw, Freehand, QuarkXpress, …). When used with
a PS driver, these applications generate the output PS themselves, instead of
using the driver’s rendering capabilities. This is known as PostScript pass-
through. So, when using an HP PostScript driver together with an application
that has PS passthrough capabilities, the PS code that comes into the printer
has not been rendered by the HP driver, and, should the source file contain
any PS commands that are not correctly processed by the printer, a 79:04
system error could occur even though an HP driver is being used.