Riso: Error A16-525

Locate the master detection sensor (usually situated above the drum area) and wipe it gently with a soft, lint-free cloth.

If the error returns immediately after a reset, a technician should evaluate the following parts:

Some models use simulation 941 (40 or -40) for drum position adjustment. Summary of Actionable Steps Pull out drum, check for stuck plastic. Remove physical obstruction. 2 Clean drum and sensor with alcohol. Remove ink buildup causing false readings. 3 Power cycle the machine. Reset the error state. 4 Check/reset master disposal box. Ensures the disposal mechanism is aligned. 5 Test with a different drum. Isolates if the problem is the machine or a specific drum.

If you operate a Riso Risograph printer (commonly models like the RZ, RP, or RN series), seeing an error code flash on the display can immediately halt your production workflow. One specific error that confuses many users is .

Riso Error A16-525 is a common message on Riso digital duplicators, specifically indicating that a master remains on the print drum and must be removed before the machine can proceed riso error a16-525

Over time, wet ink or oily residue bleeds onto this black strip. The reflective ink tricks the optical sensor into thinking a light-colored master sheet is still covering it.

Ink or dust on the drum's sensors can cause false readings.

Enter the Riso service mode (the exact key combination varies by model, such as holding specific arrow keys while powering on). Run the specific test codes for the Disposal Motor Forward (e.g., Test 240) and Disposal Motor Reverse to see if the motor spins freely.

Inspect the (black velvet). If it looks worn, try darkening it with a black permanent marker or applying a small piece of black gaffer's/washi tape. 4 Reset the Machine Locate the master detection sensor (usually situated above

| Part Number (Example) | Description | When to replace | |-----------------------|-------------|------------------| | 970-11205-XXX | Home position sensor assembly | Sensor gives no signal or intermittent signal | | 940-20410-XXX | Encoder disc (color-specific) | Cracked or missing timing marks | | 910-50001-XXX | Drum drive belt | Slipping, cracked, or teeth missing | | 910-40012-XXX | Drum drive motor (stepper) | Motor stalls or fails to rotate drum consistently |

Before you begin, ensure the machine is turned off and unplugged to prevent any accidental electrical shocks or mechanical movements.

By following these steps, you should be able to resolve the and continue with your print job. If the issue persists, the print-drum sensor may need to be replaced by a technician.

If you operate a Risograph duplicator (such as the ), encountering an error code can bring your high-speed production line to a grinding halt. One of the most common and persistent faults is Error A16-525 . Remove physical obstruction

Use a soft, lint-free cloth and Riso cleaner to clean the screen and the metal portions of the drum.

Here is a comprehensive guide to understanding what this error means, why it happens, and how to troubleshoot and resolve it. What Does Riso Error A16-525 Mean?

Understanding and Fixing the RISO Error A16-525: A Complete Troubleshooting Guide

: Open the front door of your Risograph, release the drum lock, and slide the print cylinder out of the machine.