Cause
There’s no single set of symptoms behind hardware-related 79:04 system errors. However, there are two
relatively common causes.
●
79:04 during start-up. Restarting the printer may or may not solve the problem.
●
79:04 while processing or printing a job. Restarting the printer and printing the same job does not
always produce the error.
Solution
In the following procedure, perform each step as it appears in the list and move on to the next step only when
you are sure the 79:04 error has not been cleared.
1. Restart the printer in Diagnostics Boot mode and execute the service tests to check the functionality of
all the electronics components.
2. Check for data-related system errors: see
Data-related SE 79:04 on page 26.
3. Replace the memory.
4. Replace the hard disk drive.
5. Escalate the issue before replacing any additional parts.
Troubleshooting based on symptoms
This section will describe which troubleshooting steps to perform for a 79:04 system error based on the
symptoms of the issue. Perform each step as it appears in the list and only move on to the next step once you
are sure the 79:04 error has not been cleared.
Front panel displays 79:04 at start-up
1. Restart the printer twice. If the system error has been caused by a job in an incorrect format, restarting
twice clears the error (the first time after restart, the printer tries to print the job again, which causes
the error to re-appear). If restarting the printer twice solves the issue, then it is an issue related to the
job: see
Job-related SE 79:04 on page 25.
2. Update the printer’s firmware. Even if the currently installed firmware version is the latest, reinstall it.
Since the printer cannot start normally, you must update the firmware while starting the printer in
Diagnostics Boot Mode.
3. Disconnect the network cable and restart the printer. If this solves the problem, then it is a network-
related 79:04 error and you should follow the guidelines for this type of 79:04 error, see
Network-
related SE 79:04 on page 27.
4. Remove all cartridges, printheads and the maintenance cartridge. Unload the paper. Restart the printer.
If the printer can start normally, insert the consumables one by one until you isolate the one that is
causing the error. Do not insert any of the replaced consumables in another printer.
5. Restart the printer in Diagnostics Boot Mode and perform the “Electronics test”. If an electronic
component is identified as faulty, replace it.
6. Restart the printer in Diagnostics Boot Mode and Reset the EEROM. If the issue is solved by this, this is a
data-related 79:04 system error and you should follow the guidelines, see
Data-related SE 79:04
on page 26.
7. If the unit has been used for some time and suddenly has started to show this behavior, replace the
Hard Disk Drive (it may be included with the Formatter in some models).
ENWW How to troubleshoot the 79:04 system error 31
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