Riso GR3770 Paper Elevator is moving very slow

[Ghostwork]

Hello everyone,
I am a fresh Risograph owner, but been using these sweet machines for a little while and solved most of the basic problems.
Today, after a paper jam in the loading section, the paper elevator stopped working properly.
It only moves very slightely. The limiters are working fine and the wheels are turning slowly.
It seems like the motor doesn't have enough power — so I suspect either there is a heavy friction somewhere or there is a power issue.

Did anybody encounter something like this before?
Any hint would be splendid. Thank you so much!

https://www.dropbox.com/scl/fi/g25q3...fbe5p&dl=0

[jermyth]

It's been years since I've seen a GR. And I haven't seen that problem before.
Do you get an error or jam code? Got Service Manual? Have you tried moving the elevator in test mode?
Good luck.

[Ghostwork]

Hej jermyth, thank you so much for your reply!
I tried everything and ended up disassembeling the whole thing.
All the mechanic wheels turn - it seems that they are really blocked by the motor, that somehow doesn't move as powerful as it used to.
Do you guys have any advice where I could find a spare part like this?

Thanks so much
Martin

IMG_6472.jpg

[GIUBOSS]

Have you measured the input on it?

[iampriyanka]

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[DWG]

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 same results.


It seems like the elevator tray is binding on its way up the teeth on the Elevator Rack, but his thing was printing just 24 hrs ago, so I'm a little stumped.

[DWG]

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 to fasten the front elevator rack or plate as I think it's referred to in the manual - on it's way up.