Inspect the sensors for any visible damage or blockages. Cleaning the sensors may resolve the issue if they are dirty.
Covering the area with black gaffer's tape or washi tape can sometimes absorb the light enough to clear a false error. riso error a16-525
While Riso error codes can be cryptic, the A16 series generally points toward the ink supply system. Understanding the specific trigger for the -525 suffix is key to resolving it quickly without an expensive service call. Understanding and Troubleshooting the Riso Error A16-525: A