Riso Error A16-525 ((top)) -

The first step in troubleshooting any electronic device or machine is to restart it. This simple action can sometimes resolve temporary glitches or errors.

Check the master guide plate, feed rollers, and cutter area. Wipe away any stray bits of stencil film, paper fiber, or excess ink buildup using a lint-free cloth dampened with a small amount of isopropyl alcohol.

This error is not exclusive to one model; it can affect a wide range of RISO digital duplicators. The A16-525 code has been reported across several popular series, including but not limited to: riso error a16-525

: As the drum rotates, a disposal hook or separator plate catches the leading edge of the old master and lifts it off the drum.

If you are comfortable with more advanced diagnostics, you can use the machine's internal Test Mode. To access it, you usually turn the machine on while holding the "Position" (or a similar) key. The exact method varies by model, so refer to your technical manual. Once inside: The first step in troubleshooting any electronic device

: The sensor cannot correctly read whether a master sheet is present or absent. 3. Aftermarket Screen Issues (The "Phantom" Error)

Use a lint-free cloth lightly dampened with to gently wipe away ink smudges, oils, or dust from the sensor window. Allow it to dry completely before re-inserting the drum. Step 4: The "Sharpie Fix" for Aftermarket Screens Wipe away any stray bits of stencil film,

: Risographs use a specialized black velvet light absorber strip (Part #023-17004) near the clamp to detect the master. If this strip wears out or is missing from an aftermarket screen, the sensor gets confused and continuously reads a master as present—even on a completely bare drum. Step-by-Step Guide to Fix Error A16-525

The Riso error signifies that the machine is "Waiting for the master to be removed" from the print cylinder (drum). This usually occurs when the sensor detects a master still attached to the drum after a disposal cycle or fails to recognize that a master has been removed. Common Causes

Officially, the error description is "". This means the machine’s internal sensors believe a used master film is still attached to the drum and must be cleared before it can create a new one. Primary Causes of Error A16-525

For official RISO service manuals and part numbers related to the PF Register Sensor (Part # typically starting with "M" or "K"), contact your regional RISO dealer.