Riso Error A16-525 [patched] -

Sometimes the machine just needs a nudge to realize the drum is clear.

If an actual master sheet is wrapped around your print cylinder, follow these safe extraction steps:

If you recently replaced your screen and are getting a false error, the black velvet strip might be too reflective. You can try darkening it with a black Sharpie or applying a small piece of black matte gaffer's tape or washi tape to help the sensor absorb light correctly.

: A used master master is actually stuck on the drum or failed to eject into the disposal box. riso error a16-525

Reinsert the master disposal box, insert a different color drum if you have one to verify the code drops, and then reinsert your primary drum.

Sometimes you must switch to a different drum, remove the master disposal box, and power the machine off and on to fully clear the error state.

Before touching the internal mechanics, check the waste container. Open the master disposal door. Pull out the master disposal box. Compress and discard the used stencils safely. Sometimes the machine just needs a nudge to

Technically, the error was nothing more than a sensor misread and a crooked feed. It had a fix in three steps: reseat the paper, check the sensor, run the cycle. But Marta liked the story better — a machine that saved the tiny, accidental past and returned it, stitched into paper, to someone who needed it.

If your model uses Test Modes, entering (Clear All Errors) may be necessary, though this is usually reserved for technicians.

Warning: Attempting to disassemble the PF drive unit without the service manual can knock the main timing off permanently, leading to costly head strikes. : A used master master is actually stuck

The is a common technical issue encountered by users of Risograph digital duplicators, specifically within the Riso RZ Series , EZ Series , and RV Series.

"I was dead in the water when my Riso printer threw the A16-525 code right before a big deadline. I called [Technician Name/Company Name] and they were fantastic. They knew exactly what the code meant (drum motor lock) and had the parts to fix it same-day. If you see this error, don't try to force it—call a pro. Highly recommend their service!"

The machine does not use physical switches to scan for a master sheet. Instead, it relies on an and a specialized non-reflective black velvet strip located right next to the metal master clamp on the drum.

) to slightly adjust the drum angle compensation to help the sensor align with the strip. Screen Issues

The Riso error signifies that the machine is "Waiting for the master to be removed" from the print cylinder (drum). This usually occurs when the sensor detects a master still attached to the drum after a disposal cycle or fails to recognize that a master has been removed. Common Causes