HP Wide-Format Printer Troubleshooting
HP DesignJet 500/510/800 Error 79:04 – Generic Firmware Error
Generic Firmware error.
Applicable models
HP DesignJet 500510800
What error 79:04 means
Error 79:04 is a generic firmware error on these HP DesignJet models. The source recommends a full power restart and checking that the printer is running the latest firmware.
Start here
What you can check first
- Turn the printer off from the rear power switch and disconnect the power cord.
- Reconnect the power cord and turn the printer back on.
- Check that the printer has the latest firmware version available for the model.
Diagnosis
Possible causes
- A firmware-related printer error.
When to call for service
If the error comes back
If 79:04 continues after a full restart and firmware check, the source recommends service.
When you contact LCR, include the exact error code, printer model, what happened immediately before the error, and whether it returns after a restart.