The Riso error code indicates that a master is stuck on the print drum or that the machine thinks one is present when it isn't . This usually happens when the master sensor cannot detect the drum's surface correctly. Common Fixes
For a visual walkthrough on clearing master jams and related errors on models like the CV 3230, watch this guide: Riso 3230 A16 525 error resolve Creator Ratikanta YouTube• Mar 30, 2023 Advanced Fixes riso error a16-525
: Physically remove any master remaining on the drum and ensure the disposal box is not full. The Power Cycle : Turn the machine off, hold down the yellow Reset button The Riso error code indicates that a master