EEVblog Electronics Community Forum
Electronics => Repair => Topic started by: Tangent_Tracker on December 19, 2022, 03:50:18 pm
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Hi, just been given the above printer with a fuser error 50.2. So followed all the advice of plugging into a wall socket etc to no avail.
Pulled the fuser out and it would seem that the element has a resistance of about 60R, which would seem about right for its type. Not able to check thermisters as i didn't have any wires handy that would sit in the plugs.
Checked the voltage and it sat at about 136 then during startup it went up to 240. Trouble is this is without the load of the fuser of course...
Sooo, given people's experience with these machines, can the fuser element appear ok but then sort of break down when current flows? Or is it more likely I am looking at a more problematic fault here?
Had to put it all together for now as need the room but I might put a flying lead on the fuser element so that I can measure the current flowing and see if voltage stays at 240v. In hindsight I should have felt for warmth straight after the test which might have helped...
Any thoughts appreciated. Looks to be a real nice laser but not knowing on the general condition not sure how much effort to go to!
Thanks
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It is possible for any heating element to present a fault only when warm, as metals expand and contract with changes in temperature.
Another possibility is that the element and its switching circuitry are fine, but that the temperature sensor(s) are at fault.
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https://www.metrofuser.com/post/50-2-fuser-error-on-hp-laser-printers (https://www.metrofuser.com/post/50-2-fuser-error-on-hp-laser-printers)
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Got the same printer since many years now. Works well with 'alternative' toners. Only major issue we have is the auto feed for the scanner. Manual scanning still works.
Replacing the fuser is a 5min job:
https://www.youtube.com/watch?v=siu3LFUMoLw (https://www.youtube.com/watch?v=siu3LFUMoLw)
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Thanks, I have had a fuser out but it tests ok. I am going to try running it on flying leads so I can measure the voltages and then I'll take it from there. I can see you can get replacement fuser units so this will be an option. I just have to be 100% sure before committing any money!
Olly.
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Only major issue we have is the auto feed for the scanner. Manual scanning still works.
@Swake
This is a typical fault for the MFM HP series.
You need to get to the wiring harness twisted in pairs.
They tend to break when opening the ADF cover frequently.
In my practice, I changed all the wires to softer ones and made the tourniquet a little longer.