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  1. Replies
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    Re: Riso GR3770 Paper Elevator is moving very slow

    Update:

    It was in fact a mechanical issue. The safety switch at the bottom of the Paper Feed Tray (the one that triggers Check Paper Area message) was bent, and contacting a machine screw - used...
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    Re: Riso GR3770 Paper Elevator is moving very slow

    Ghostwork,

    Did you ever figure this out? I'm troubleshooting it currently and have the same symptoms. I have switched out the Motor Unit with one from a donor machine, only to end up with the...
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    Re: Riso GR1700 paper feed problem

    I just replaced my entire feed tray, sensors and all, with one from a GR3750 (I am fortunate enough to have two parts machines) so I'm guessing it was just a bad sensor.

    Annaannalarue, if you...
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    Re: Riso GR1700 paper feed problem

    So I'm having the exact same issue with my GR3770... I just ran about 50 sheets of 80lb card and changed drums, then went to feed the paper back through and the sensor wouldn't pick it up.
    ...
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    Re: GR3770 stuck in a loop

    -FIXED-

    jermyth, I did try the reset on start (one of the very first things I did) but the drum just went right on spinning.

    I am not exactly sure what was malfunctioning, but I started to...
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    Re: GR3770 stuck in a loop

    20 Gauge, thanks for responding.

    The last drum that worked in the machine was black(HD). I've tried putting the exact one back in, but the same thing happens regardless of drum or color. No power...
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    Re: GR3770 stuck in a loop

    https://youtu.be/CWJOQaYyyN0


    here's a look from the back of the machine, please help if you can
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    GR3770 stuck in a loop

    Was printing fine last night until I removed a drum and inserted a different one into the machine...

    The drum started turning as it sometimes does in idle after start up, but was blinking ' -...
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    [Jamming] GR3750/70 Double Trouble

    First let me quickly give a thank you to all techs and wannabe-techs and plain old hobbyists on here, I've been following for a while now and this is an invaluable resource!

    I have two machines...
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    Re: GR3750 master removal problem

    (New member here, first post!)

    OP, any progress on this? Rescued a 3750 and am having the same issue. Not a tech, but pretty handy...

    Been studying manual and exploded view parts schematic but...
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