User's Manual

System Error Codes
2-40 HP Designjet T Series — Service Manual
 Application/RIP/Driver settings
 Type of output files this application, RIP or driver is generating
 Some sample files that are representative of what the customer is using
 Operating System
 Method of connection to the printer
A description of the normal flow when the issue occurs and the typical
fr
equency of occurrence (i.e. once every hour when sending non stop
several files, each of them with multiple copies)
With this information, the environment can be replicated in order to try and
fi
nd workarounds. This is also the information that will be needed at the
GBU to investigate and fix the root cause of this issue once it is escalated.
Hardware related SE79:04
Hardware is, by far, the least likely cause of a 79:04 system error. Replacing
hard
ware components does not normally fix the issue and increases the total
turn around time in finding a workable solution.
In some cases, a failure in a component in the printer’s electronics may
caus
e a 79:04 system error, since the printer’s electronics are involved in the
execution of the firmware and the processing of jobs. It needs to be noted,
however, that hardware failures in the electronics tend to produce specific
system errors that point directly to the component that is failing.
Some HW causes that could be behind a 79:04 error are:
 Defective clusters in the Hard Disk drive. If these clusters are used to
execute the firmware or to process a job, they may produce a 79:04. It
needs to be noted however, that most 79:04 errors that are resolved by
an HDD replacement are in fact, data related 79:04 that could have
been solved more efficiently and quickly following the steps in Section 3.
 Defective memory segments. If the RAM memory has some defective
segments, a 79:04 may occur when these segments are used.
 Intermittent defects in the electronic components that are involved in the
processing of a job: Carriage PCA, Trailing cable, Formatter and Print
Mech. This is a highly unlikely cause, since defects in these components
will produce subsystem specific errors.
Symptoms
There’s no single set of symptoms behind hardware related 79:04 system
er
rors. The most usual ones, however are:
 79:04 during start up. Rebooting the printer may or may not solve the
problem
 79:04 while processing or printing a job. Rebooting the printer and
printing the same job does not always produce the error.
Solutions and workarounds
In the following procedure perform each step as it appears in the list and
on
ly move on to the next step once you are sure the 79:04 error has not
been cleared:
1 R
eboot the printer in Diagnostics Boot mode and execute the service tests to
v
alidate the functionality of all the electronics components