HP Designjet T Series — Service Manual 2-35
Appendix A: How to troubleshoot SE 79:04
Solutions and workarounds
When a job consistently generates a 79:04 system error, it is either because
of a issue in the printer’s firmware or because of a defect in the job itself
(when it has been generated by 3rd party SW). In order to identify the
cause and find out a solution, these issues should always be immediately
escalated to the GBU through the GCC.
Also, there are a set of workarounds and short term solutions that can be
t
ested in order to get the customer up and running in the shortest possible
time:
1 Send the
job using a variety of different settings. Many times, the issue is
caused by a combination of the job contents combined with some specific
setting(s).
2 If
the customer is sending the file directly to the printer, try using the HP
driver instead.
3 If
the issue is occurring when printing through the HP PostScript driver from
an application with PS passthrough, try changing the options in the
application so that it prints PS as raster (the option is typically located in the
“Advanced” options of the application’s printing dialog).
Data related SE79:04
HP Designjet printers have Hard Disks and non volatile memories that
cont
ain data bases and files that can be modified with user data. Some
examples include:
The printer’s queue
The hard drive partitions that contain user jobs
The data base that stores the printer settings
The data base that stores accounting information
Some of this data is accessed by the print
er at start up, and some others are
accessed as needed.
If any of this fields contains corrupt data or data with characters or values
that cannot be cor
rectly processed by the printer, a 79:04 system error may
occur.
Possible symptoms
There are two different types of symptoms for data related 79:04 system
er
rors:
1 W
hen the corrupt data is accessed during start up:
a T
he printer will display a 79:04 during the start up process
b S
witching the printer off and on again will not solve the issue. The printer
will continue displaying the 79:04 system error until the corrupt data has
been cleared through a service procedure
2 W
hen the corrupt data is accessed during normal printer operation
a T
he printer will start up normally
b W
hen the data is accessed (for example while printing, while navigating
the queue or when changing some settings), the printer displays a 79:04
system error
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