How to troubleshoot the 79:04 System Error 65
Troubleshooting
How to troubleshoot the 79:04 System Error
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:
Data related SE79:04
HP Designjet printers have Hard Disks and non volatile memories that contain data bases and files that
can be modified with user data. Some examples include:
• The data base that stores the printer settings
• The data base 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.
Possible symptoms
There are two different types of symptoms for data related 79:04 system errors:
1. When the corrupt data is accessed during start up:
a. The printer will display a 79:04 during the start up process
b. Switching the printer off and on again will not solve the issue. The printer will continue display-
ing the 79:04 system error until the corrupt data has been cleared through a service procedure
2. When the corrupt data is accessed during normal printer operation
a. The printer will start up normally
b. When the data is accessed (for example while printing, when changing some settings, the
printer displays a 79:04 system error
c. The printer can reboot normally
d. When the data is accessed again (typically, under the same conditions as in step “b”), the
79:04 system error is displayed again
Solutions and workarounds
To Next Page
Loading...