HP Designjet T920

4. After the second restart, the printer will start up normally
5. If the same job is sent again, it will always produce a 79:04 system error
These types of 79:04 system errors are normally caused by jobs that have been generated 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 rule: 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.
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 software). In order
to identify the cause and find out a solution, these issues should always be immediately escalated to the GBU
through the GCC. However, there are some workarounds and short-term solutions that can be tried 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).
4. In some cases, there may be an unfortunate interaction between the particular job and the I/O
connection used to send that job to the printer. Try sending the same job using a print queue that uses a
different type of connection. For example, use a network connection instead of USB, or use the LPD
network printing protocol instead of port 9100.
Data-related 79:04
HP Designjet printers have hard disks and non-volatile memories that contain databases 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 database that stores the printer settings
●
The database that stores accounting information
Some of this data is accessed by the printer 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 correctly processed
by the printer, a 79:04 system error may occur.
144 Chapter 3 System error codes ENWW