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  1. #1
    Senior Tech 250+ Posts Polo-022's Avatar
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    HP LASERJET PRO M402n

    I have an M402n printer. It prints totally blank pages.
    I replaced toner cartridge, High Voltage contacts have been checked,
    plug/jacks also, drives and coupling to toner/drum work, Laser inspected
    for obstructions...
    I had a same problem with an MFP HP3390 in the past...does anyone
    know what is the cause of this, please?
    Thanks a lot for any input.

  2. #2
    Senior Tech 100+ Posts 1stcavvet's Avatar
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    Re: HP LASERJET PRO M402n

    is the laser shutter opening when you insert toner??? just asking

  3. #3
    Service Manager 1,000+ Posts
    HP LASERJET PRO M402n

    FrohnB's Avatar
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    Re: HP LASERJET PRO M402n

    Had one where one of the contacts that touches the cartridge/ drum was stuck inside it's hole on the frame of the machine. Popped it back out, and Voila!
    Omertà

  4. #4
    Senior Tech 250+ Posts Polo-022's Avatar
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    Re: HP LASERJET PRO M402n

    Quote Originally Posted by 1stcavvet View Post
    is the laser shutter opening when you insert toner??? just asking
    I didn't find a laser shutter connected somehow with toner insertion or detection mechanism.
    There is a white arm link but it is not connected with laser unit. Am i missing something there?

  5. #5
    Senior Tech 250+ Posts Polo-022's Avatar
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    Re: HP LASERJET PRO M402n

    Quote Originally Posted by FrohnB View Post
    Had one where one of the contacts that touches the cartridge/ drum was stuck inside it's hole on the frame of the machine. Popped it back out, and Voila!
    I checked those contacts again and again there are three for the All In One catridge and one for the
    transfer roller.

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