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  1. [Error Code] Re: GR3770: Elevator Locked -- Running w/o Paper Feed Safety Switch & Actuator Plate

    Quick update:

    I double checked the fuses and wire connections throughout. I also manually elevated the feed table about an 1.5" using the elevator motor worm gear. As soon as I turn the machine on...
  2. Re: Riso GR image banding/noise at intervals on side of prints (in master)

    Thanks for your input everyone! I looked over the machines with a tech yesterday and we ruled out the drums and pressure rollers, as the printing issue occurred the same way between both machines,...
  3. [Error Code] GR3770: Elevator Locked -- Running w/o Paper Feed Safety Switch & Actuator Plate

    Hi all,

    Bit of a mysterious case here, unless I've overlooked something obvious. I'm doing some work on a GR3770 I acquired some months back, which has been fully functional and behaving normally...
  4. Riso GR image banding/noise at intervals on side of prints (in master)

    Hi all,

    I’m troubleshooting a partial image banding “noise” issue occurring at regular intervals across one side of all prints. This is visible in the burgundy print on the left side of the...
  5. Riso GR Drum - Part of Ink Pump Removed with Ink Tube

    Hi all, I'm running a GR3750. I just went to replace a tube of ink, and upon removing the old tube, this small plastic/rubber component was stuck in the end of the tube (see picture below). Looks...
  6. Re: Riso GR 3750 Clamp Motor Issue / T3 Error

    Hi LA Tech,


    Can you please elaborate a bit on what timing adjustments I should be looking for? I have the tech manual, but I’m having trouble wrapping my head around it.

    Newest problem, which...
  7. [Jamming] Fresh T3 Error / Clamp Jam -- GR3750

    Hi everyone, hoping you may have some pointers on GR3750 timing and/or my brand new T3 error. Some backstory --

    I just started experiencing an issue with my machine out of nowhere the other night...
  8. Re: Riso GR 3750 Clamp Motor Issue / T3 Error

    The problem seems to have been solved.I removed the clamp motor unit, cleaned it up and hit the motor shaft and bearing with white lithium grease, and reinstalled. I also lubricated the angular...
  9. Riso GR 3750 Clamp Motor Issue / T3 Error

    Hi everyone,
    I’ve run into an issue with my GR 3750, and I’d greatly appreciate your input. It seems like my clamp motor has died. Here’s what I’ve gathered so far, with video for reference here --...
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