Riso Error A16-525 New! May 2026

: Non-original "generic" silkscreens often use white plastic mesh. The sensor's light reflects off this mesh, tricking the machine into thinking a master is still attached.

: If the drum's "Position-A" is slightly off, the sensor may look at the wrong part of the drum (like the metal surface) instead of the black absorber strip. Troubleshooting and Fixes 1. Immediate Physical Check

The is a common "service call" code on Risograph digital duplicators, typically indicating that the machine is awaiting master removal from the print cylinder . While it primarily signals that a used master is still attached to the drum when the machine expects it to be gone, it often appears as a "false" error even when no master is present. Common Causes of Error A16-525 riso error a16-525

If physical cleaning doesn't work, you may need to clear the machine's state:

: Some users find success by placing a small piece of matte black gaffer tape over the strip to improve light absorption. 3. Reset and Service Mode : Non-original "generic" silkscreens often use white plastic

If the error persists on a clean drum, it is likely an optical detection issue.

Riso rz300ep: error a16-525 - Конференция StartCopy Troubleshooting and Fixes 1

: There is a small black velvet strip on the drum meant to absorb sensor light. If this strip is worn, dusty, or missing, the sensor detects reflection from the metal drum instead.

: Wipe the small black velvet strip (usually near the clamp) with a dry cloth to remove paper dust.

: A used master master is actually stuck on the drum or failed to eject into the disposal box.