Riso Error A16-525 [2021] 【2026 Update】

This guide breaks down why this error occurs, how to clear it immediately, and how to prevent it from disrupting your print jobs. What Causes the A16-525 Error?

If the problem only follows one specific drum, the issue is strictly on that drum's black strip or clamp. If the error happens on every single drum you insert, the optical sensor inside the machine frame is dirty or failing.

: Ensure the master disposal box is empty and correctly seated. Clean the Master Sensor riso error a16-525

Gently clean the sensor lenses to clear away dust or debris.

To prevent the recurrence of the RISO Error A16-525 and ensure the longevity of your RISO printer: This guide breaks down why this error occurs,

: Turn the machine off, remove the master disposal box, and turn the machine back on. Test Mode Reset

The disposal compression plate is physically bent, stuck, or broken. If the error happens on every single drum

The printer's sensor (the print-drum set sensor) is expecting to see a clean, empty drum because it believes the master removal process should have completed. Instead, the sensor detects that the old master is still present, or a remnant is stuck to the drum, causing the machine to halt, often as a preventative measure to avoid damaging the master-making unit or the drum screen itself. Common Symptoms The error persists even after removing the drum. The machine refuses to make a new master.