• ×
    Information
    Windows update impacting certain printer icons and names. Microsoft is working on a solution.
    Click here to learn more
    Information
    Need Windows 11 help?
    Check documents on compatibility, FAQs, upgrade information and available fixes.
    Windows 11 Support Center.
  • post a message
  • ×
    Information
    Windows update impacting certain printer icons and names. Microsoft is working on a solution.
    Click here to learn more
    Information
    Need Windows 11 help?
    Check documents on compatibility, FAQs, upgrade information and available fixes.
    Windows 11 Support Center.
  • post a message
Guidelines
Do you need the WPS PIN to connect your printer? Click here for tips and tricks!
Get help with Large Format Printers, with direct access to all Large Format Knowledge Center· Ask anything · Find anything · Share anything at HP LKC
HP Recommended
Designjet 800 c7780c

Can't get rid of the 79.04 code. Have isolated the plotter and confirmed latest firmware. 

Display reads:

 

System Error

 

Asertion : failed

task: interrupt

file: carmotor.c

line: 2364

 

Greatfull for any help.

1 ACCEPTED SOLUTION

Accepted Solutions
HP Recommended

Hi 

 

the 79 error is quite generic

 

Its hard to track down  BUT 

 

I have found the most common cause to be a faulty printhead. 

 

If you have a spare set  replace them 

 

It only be one which as failed -so you can chase down which one it is

 

The next cause is the Electronics module.   These are available on ebay. It is about 1 hours work to swap it out. Needs only simple tools 

 

 

Good luck

 

 

 

 

View solution in original post

2 REPLIES 2
HP Recommended

Hi 

 

the 79 error is quite generic

 

Its hard to track down  BUT 

 

I have found the most common cause to be a faulty printhead. 

 

If you have a spare set  replace them 

 

It only be one which as failed -so you can chase down which one it is

 

The next cause is the Electronics module.   These are available on ebay. It is about 1 hours work to swap it out. Needs only simple tools 

 

 

Good luck

 

 

 

 

HP Recommended

Thanks, that fix it.

† The opinions expressed above are the personal opinions of the authors, not of HP. By using this site, you accept the <a href="https://www8.hp.com/us/en/terms-of-use.html" class="udrlinesmall">Terms of Use</a> and <a href="/t5/custom/page/page-id/hp.rulespage" class="udrlinesmall"> Rules of Participation</a>.