c. The printer can restart normally.
d. When the data are accessed again (typically, under the same conditions as in step b), the 79:04
system error is displayed again.
Solution
Data-related 79:04 errors are often resolved by means of hardware intervention. Since data are stored in
physical components (RAM, EEROM and hard disk), replacing these components with new ones that are
empty usually solves the problem. However, there are quicker and more effective solutions to these types of
errors.
1. Clear all information that has been introduced by the customer using the standard tools available in the
printer.
a. Delete all jobs from the queue (from the front panel or the Embedded Web Server).
b. Reset to factory defaults to clear the customer’s configurations and calibrations.
c. Delete any non-standard paper presets in the printer (both the ones that have been created by the
user and the ones that have been installed as OMES profiles through the Embedded Web Server or
the HP Utility).
2. If step 1 did not resolve the issue, you can use Service Tools to clear additional information that could
be causing the issue.
a. Start the printer in Diagnostics Boot Mode.
b. Perform an EEROM reset.
3. If step 2 did not resolve the issue, it is possible to clear all the information on the hard disk and the
different EEROMs, leaving them as they were when the printer was new.
a. Access the Service Utilities Menu.
b. In the Secure Disk Wipe menu, set the Sanitize level to Insecure mode.
c. Execute the disk wipe. This will clear all partitions on the hard disk that contain customer data,
including the partition in which the operating system is installed. After the disk wipe has
completed, a backup firmware version will automatically be installed from a backup partition to
allow the printer to start up. This backup firmware is a very old version.
d. The firmware in the printer should be updated to the latest official version as soon as the printer
has restarted.
After step “c”, any 79:04 which is caused by corrupt data in the printer will be solved.
NOTE: It is possible that the corrupt data came to be in the printer as a consequence of some activity
in the customer’s workflow. In this case, it is possible that the issue will happen again. In these cases, it
is very important to understand the sequence of events in the customer’s workflow that led to the error
occurring. Once the error can be traced in the customer’s workflow, escalate the issue to the GBU
(through the GCC). This is done to implement any changes in the printer’s firmware that can prevent
these issues occurring again.
Network-related SE 79:04
The printer has built-in networking capabilities. Network settings can be set manually, but in most cases they
are obtained automatically from the printer. These settings include many different fields, such as IP address
and subnet mask, available gateways, host and domain names and so on.
In some cases, there can be issues in the firmware that can cause a certain value in one of these fields to be
interpreted incorrectly, and this can lead to a 79:04 system error.
ENWW How to troubleshoot the 79:04 system error 27
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