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  1. #1
    Technician irrland's Avatar
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    May 2014
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    GR3770 - possibly thermal print head broken

    Hello everybody!
    We have a problem with our GR3770: from one moment to another the master is showing horizontal lines of different widths (see attachment). So a Riso tech I talked to on the phone said from what I told him pretty sure the thermal print head is broken. The error occurs with different drums and when printing from the RIP as well as using the scanner.
    I just wanted to ask if you guys can confirm his guess, as he didn't see any prints, from looking at the pics I attached.

    In addition, is there anybody from Germany (or Europe) who has a spare thermal print head for a GR 3770 we can buy. Is it possible to repair it by ourselves?

    Thanks a lot for your help,

    Attached Images Attached Images

  2. #2
    Senior Tech 250+ Posts 20gaugeO/U's Avatar
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    Feb 2009
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    Re: GR3770 - possibly thermal print head broken

    Reseat the connectors to the TPH (may fix the wide white void area- doubt it will do anything for the pencil thin lines) and do the exact same thing as this thread

    RA-4200 - light streaks down middle...

    GR is the model after RA but the idea is essentially the same.


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