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Riso GR3750 T1 error Drum Jam

I have a drum stuck in the machine with a T1 error message. I saw the latest post on this problem but cannot located the latch/hook the gentleman speaks of. I service manual is in route, but need to get this running asap. Any help? Thanks I have a master stuck around the drum so the machine wont let me release the drum, it keeps saying master stuck in disposal unit but there is not! It also comes up T1 but the catch as listed on problems solved is not engaged, does anyone know how to manually release the drum?

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I had this problem too: just unlock the hook under the drum; disengage the drum then pull out the drum; then check the home position if not in position open the behind cover, pull the belt until you get the puller to the home position. You will get the same problem if you will not put the main drum puller to the home position.

Posted on Jan 24, 2009

  • chimuntu Jan 25, 2009

    Great: thank you chimuntu; it works!!!



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SOURCE: Riso GR3750 T1 error Drum Jam

The hook is located just above the power supply once the back cover is off. Also there is a drum release centered under the drum that a screwdriver can disengage.

Posted on Apr 22, 2008

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Remove the back cover. Locate and check the rubber reel running at the excenter of the print drum. Do not turn the machine in forward direction till this is solved. Else you may damage the clamp mechanism.
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Riso GR3750 T1 error Drum Jam

The hook is located just above the power supply once the back cover is off. Also there is a drum release centered under the drum that a screwdriver can disengage.

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Error Code

From memory (haven't looked at one for about 7 years) the T1 fault was when the latch hadn't disengaged.

Back panel off, towards the middle at the bottom there is a small solenoid with a kindof latch/hook. It will be engaged onto a small lever.

IF it is the same fault as above, it's really easy to sort, by pushing it off with a screwdriver, as a lever.

The way to tell is if the roller under the drum is still engaged. If so, you won't be able to pull out the drum.

Let me know if it helps, or if you want another suggestion.

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