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Archived This topic has been archived. Information and links in this thread may no longer be available or relevant. If you have a question create a new topic by clicking here and select the appropriate board.

‎02-12-2017 09:47 AM

HP Recommended
Product: Laserjet 4m
Operating System: Microsoft Windows 10 (64-bit)
Laserjet 4m prints perfectly but after it has been switched on for a few minutes it goes into "05 self test" mode and won't print. If I switch it off and leave it off for a good while, it will work again but then the same issue arises after being on for a few minutes. Any ideas? I wondered if it might be a power supply fault but could be anything. Any help much appreciated.
5 REPLIES 5

‎02-12-2017 03:05 PM

HP Recommended

The 05 self test is a routine which the printer goes thru duing power on and also I think when you run a config page or test page it will also display this message. If it is a hardware issue I would think the formatter is the problem but there really is no test. The first thing I would do is remove the cable that goes from the printer to the computer or network so you only have power and turn on the printer and see if the error comes on after a time or it just stays at ready. It is always possible that some communication between the computer and the printer is causing the printer to enter this mode. How is the printer connected (parallel, parallel to usb or network) as that could be an issue if the printer does not go into that mode when nothing is connected except power. If that is the case see if there is a setting for bi-direction communication to see if you can turn it off so the printer only received date and does not talk back to the computer or network.

‎02-12-2017 05:25 PM

HP Recommended

Thanks for replying. The fault happens even with only the power cable connected. Another site suggested dodgy formatter board too. I will try a new board.

‎02-20-2017 11:02 AM

HP Recommended
Replaced formatter board with a used replacement and problem remains. Any other ideas? Could it be faulty memory sticks?

‎03-26-2017 08:56 AM

HP Recommended

Bumping this post.

I've tried replacing the memory and that did not fix the problem either. The printer goes into self test only after it has warmed up for 5 minutes. From cold it appears to work fine, so it must be a component that has drifted out of spec or something.

 

Anyone got any ideas?

‎03-26-2017 10:02 AM

HP Recommended

Only two other items would be the control panel itself since you can activate the test with the panel or the dc controller.

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