Riso Error A16-525 Link (2026)

: Regularly maintain your Riso duplicator according to the manufacturer's guidelines. This includes cleaning the machine, checking for wear and tear, and replacing parts as needed.

Many users fix "false" A16-525 errors by using a black Sharpie to darken the non-reflective velvet strip on the drum. riso error a16-525

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. : Regularly maintain your Riso duplicator according to

If cleaning fails, more advanced solutions are required. Replacing the feed tires and separation pad is a standard, low-cost procedure that restores mechanical reliability. In cases where the error occurs only when printing on heavy stock (e.g., cardstock), adjusting the "paper thickness" dial or lever to a heavier setting changes the pressure between the feed roller and separation pad, allowing thicker media to pass. For persistent sensor errors after cleaning, a sensor test mode exists within the Riso’s service menu. Entering this mode (often via a specific key sequence) allows the user to wave a piece of paper in front of sensor 525 while the machine is idle; if the display does not change state, the sensor is electrically dead and requires replacement by a certified technician. Attempting to bypass or ignore the A16-525 code—by repeatedly pressing the reset button—is counterproductive. It will only lead to crumpled masters, ink on the pressure roller, or costly damage to the drum’s mesh. If you recently replaced your screen and are

“I sent the paper. I waited for the sensor to trigger. The sensor did not trigger within the allowed window. Either the paper didn’t arrive, the sensor is lying, or the roller is slipping.”