. While it often appears when a master is actually stuck, it is notoriously common as a "false error" on older or modified Risograph machines like the EZ and RZ series. 1. The Quick Fix: Manual Reset
: Sensors play a crucial role in monitoring the machine's operation. A malfunctioning sensor can incorrectly report errors, including the A16-525, even if there is no actual problem with the print drum or paper. riso error a16-525