Riso Error A16-525 [ 2026 ]

Error indicates that the printing cylinder (drum) for a specific color (usually Black, Cyan, Magenta, or Yellow) has failed to return to or find its home position within the expected time frame during operation or initialization.

If the above steps fail, the problem could be related to physical alignment or incompatible parts:

It is highly common for a drum to trigger an A16-525 error when it is completely bare. If you insert a drum and immediately get flagged for a stuck master, use these steps to trace the issue: Step 1: Inspect and Rejuvenate the Black Velvet Strip

: Ensure the environment around the Riso duplicator is clean and free from dust. Dust can accumulate inside the machine and cause operational issues.

Take a soft, lint-free cloth lightly moistened with isopropyl alcohol (or water if alcohol is restricted by your manual). riso error a16-525

操作实践表明，当一直使用原装RISO版纸/蜡纸的设备突然更换为兼容耗材时，可能出现A16-525报错。这是因为兼容版纸的尾部切割或表面反光率可能与原装标准存在差异，从而干扰了机器的检测逻辑。

Before opening any panels, try a simple power cycle:

Take a clean, lint-free cloth lightly dampened with isopropyl alcohol (rubbing alcohol) or specialized rubber cleaner. Gently wipe down the black strip to remove accumulated ink glaze. Let it dry completely. Inspect the Light Absorber Strip for Damage

Did this error start happening or a heavy print run? Error indicates that the printing cylinder (drum) for

Riso Error A16-525 typically indicates that the machine is "Waiting for the master to be removed"

If you operate a RISO digital duplicator (such as the popular GR, RZ, EZ, MZ, or SF series), encountering an error code can bring your high-speed printing production to a grinding halt. Among the most frustrating of these issues is , which officially translates to: "Waiting for the master to be removed from the print cylinder (drum)" .

: Check the master disposal unit and the entrance of the disposal box for crumpled master pieces.

If the error occurs on a bare drum, the light absorber strip is the primary culprit. Dust can accumulate inside the machine and cause

If you are seeing on your Risograph (common on EZ, RZ, and SF series), your machine is likely stuck in a loop. The official meaning is: "Waiting for the master to be removed from the print cylinder (drum)" .

: The control board and firmware work together to manage the machine's functions. A problem with either component, such as outdated firmware or a faulty control board, can cause operational errors, including the A16-525.

: Generic or third-party silk screens often use materials that are more reflective than original Riso screens, confusing the optical sensor.

To fix the A16-525 error, it helps to understand what the machine expects to happen during a master change:

: If the error persists and you cannot find a solution, it might be best to contact RISO's customer support directly. They can provide guidance specific to your machine model and error code.

If the velvet is dusty, worn, or scrunched up, the sensor sees a reflection from the metal/mesh underneath and thinks a master is present.