Question about HP Color LaserJet 3500 Printer

1 Answer

Hi there, i have an hp 3500 printer. the fuser was ript appart and needed replacment.(the rol was broken on one side and was not burning the inkt on the paper anymore) i have got a new one, but keep on getting error 50.9 fuser hot. when installing the old but broken one, there's no problem. i have orderd a second fuser, and it give's the same error. i checked the connectors, it seems oke. the fuser does not feels to hot or something like that. anyone any idee...

Posted by info95775 on

  • info95775 Jun 09, 2011

    just an update for you al..

    the connectors and the dc controllers checked out just fine..
    that's not the problem.
    but i have taken on the bold step of taking appart the new and old fuserkit, just to create one working one from those two (old end new broken) fusers.

    i have opend the new fuser unit and have taken out the heater and its sensors, and have replaced it with the heater and sensor unit from the old fuser kit.
    and like a miracle it works.... :-)

    just keep in mind to first strip the old one and the seccond after the old one, just to learn the inside of the fuser.

    but for now its working fine, no more errors and a nice clean print.
    thanks for the help. your last words where the push for me to take them appart.
    I thought, wel nothing to lose, its broken already.



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Maurizio Sorgo

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50.9 error - Fuser Failure (Abnormally High
Temperature Sub Thermistor)
1. The connector between the fuser and
the printer is not connected properly.
Reseat the fuser. Check the connector J5013
between the fuser and the printer. Replace it
if damaged.
2. Short in the sub thermistor. Turn the
printer off and remove the fuser. Measure the
resistance between the fuser connectors
J5013LA-4 (SUBTH) and J5013LA-3
(+3.3V). If it reads 600 ohms or below (at
ambient temperature), replace the fuser.
3. Faulty DC controller PCB, replace the
DC controller PCB.

I think you've some problems on the connectors, check the connections.
If you are able, replace the broken fuser roller from the old fuser with one from the new fuser.

Posted on Jun 09, 2011

Testimonial: "thanks for the tips, it was the last words that did the job, read the comments on the post.. grtz"


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