I had the 79 service error on my Laserjet pro 200 m276nw. The manual says this is "The product has experienced an internal firmware error." and gives no further diagnostic steps. Thanks HP for nothing!
Repair manual downloads:
https://www.printersupplies.com/amfile/file/download/file/20/product/5896/
https://www.laserexpressinc.com/manuals/HP/hp-clj-pro-200-m276-troubleshooting-manual.pdf
The initial symptoms was that it would randomly restart and then get stuck in the 79 error. If you turned the printer off and on, it would get stuck in the 79 error about half the time. It would get to the part where it runs the sheet scanner motors with a kind of sickly sound and then just quit.
To view the diagnostic Error Report log on the secondary service menu
Click on setup icon,
Touch middle left below home button and lower right below question mark.
to activate 2nd service menu to print error report
The Error Report had an error:
Abort
Task: IO_usbhost_urb_complete
I found that all of the boards for this printer are relatively inexpensive, so I bought every board for this printer on Ebay.
HIgh Voltage Power Supply: RM1-8705 HVPS $24.95
Fuser Power Supply RM1-8709-000CN $20.00
Formatter w/wireless card CF224-60001 $42.00
DC Controller RM1-8704 $25
Low Voltage Power supply RM1-9012-000CN $34
Universal Serial Bus (USB) CF368-60001 $13
Things only got worse. The yellow toner stopped working and the remaining colors were out of alignment. It would also only print in black and white. It then began to print solid black pages. I was about to give up, so I began putting the old boards back in since it seemed to be getting worse after spending $159 on parts.
I replaced the formatter board which didn't do anything. Then I replaced the DC Controller board and BINGO, that seemed to fix the printer. I don't think the board itself was defective, but maybe there was a loose wire or connection that eventually fixed itself with the install/uninstall process. I'm still not sure and I'm not going to mess with it while it is working since these multi-function printers are expensive to replace. So, if you get the dreaded 79 error, you might try to unplug/plug every connector to make sure everything is tight.
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