Riso Error A16-525 ((better)) May 2026

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

: 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. riso error a16-525

: 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 physical cleaning doesn't work, you may need to clear the machine's state: The is a common "service call" code on

: 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

If the error persists on a clean drum, it is likely an optical detection issue. If this strip is worn, dusty, or missing,

: If using an aftermarket screen, use a black permanent marker (Sharpie) to darken the entire black strip and the area around it to ensure no light reflects back to the sensor.

Riso rz300ep: error a16-525 - Конференция StartCopy