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Thread: HP LJ Pro M476

  1. #1
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    HP LJ Pro M476

    ITB stops momentarily when paper reaches transfer roller, resulting in a z-fold jam - as a temp measure i cut down the transfer roller springs to reduce pressure

    would like to return with a permanent fix - anyone seen this before?

    thanks in advance

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    Re: HP LJ Pro M476

    bump

    anyone? anything?

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    Re: HP LJ Pro M476

    have you checked all the flag sensors if they return correctly? how many prints does it have, transfer condition and fusers?

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    Re: HP LJ Pro M476

    Quote Originally Posted by GIUBOSS View Post
    have you checked all the flag sensors if they return correctly? how many prints does it have, transfer condition and fusers?
    110k, paper sensor flags all operate normally, transfer & fuser look fine - ITB stops just for a moment when paper reaches registration, then jams with a 1 inch Z fold at the top - reducing the transfer roller pressure by cutting down the springs got it to work but this is only a temporary solution

    during warm-up with the back door cheated i could not stop the ITB with my finger

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    Re: HP LJ Pro M476

    condition of the paper pick-up rollers?

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    Re: HP LJ Pro M476

    Quote Originally Posted by GIUBOSS View Post
    condition of the paper pick-up rollers?
    new - curious to know what you think a feed roller may have to do with the ITB stopping when paper reaches registration?

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    Re: HP LJ Pro M476

    usually I do not neglect any details for jamming problems, a delay or advance on the paper detachment could compromise the time on the way to the register. The register magnetic clutch to be checked

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    Re: HP LJ Pro M476

    Quote Originally Posted by GIUBOSS View Post
    usually I do not neglect any details for jamming problems, a delay or advance on the paper detachment could compromise the time on the way to the register. The register magnetic clutch to be checked
    after 34 years of printer repairs, neither do i as these are the first things any tech checks before consulting other techs

    thank you kindly for your responses, but i am looking for responses from people who have seen this specific problem before and have successfully applied a solution

    i agree the ITB drive clutch is the likely culprit as reducing the transfer roller pressure remedied the problem and got the machine working, however i couldn't stop the ITB during warm-up with my finger

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    Re: HP LJ Pro M476

    I would try to invert the two main motors if you have time ..

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    Re: HP LJ Pro M476

    Paper size? By pass doing same thing? Have seen that problem before a few moons ago, sorry have to see if I have a solution in my files. Ill get back, not much work coming in.

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