Riso Error A16-525 !!better!! May 2026

: The machine uses an optical sensor to detect masters. If the sensor is dirty or blocked, it may falsely report a master is present.

: 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 riso error a16-525

: Wipe the small black velvet strip (usually near the clamp) with a dry cloth to remove paper dust. : The machine uses an optical sensor to detect masters

: 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 riso error a16-525