Introduction
The System error 79:04 is a generic firmware error (equivalent to a blue screen in Windows). The printer displays this error when an unknown exception occurs that cannot be pointed to by any specific subsystem of the printer. Since this is a generic error, it has multiple causes. This document describes the probable cause behind a system error 79:04 and recommends the most efficient troubleshooting steps to resolve the error. Although 79:04 system errors can be caused by a hardware malfunction, the vast majority of 79:04 system errors are software or firmware issues. In these cases, the issue can only be solved by determining the root cause and implementing a solution. The solution usually involves correctly configuring a selection, updating the printer’s firmware/software, or fixing an error in the code.
Symptoms
There is no single set of symptoms behind hardware related 79:04 system errors. The most usual ones are: