The Riso error A16-525 typically means the machine is "waiting for the master to be removed from the print drum". It often occurs when the master sensor incorrectly thinks a master is still attached, even if the drum looks empty. Direct Troubleshooting Steps
Less common, but more severe. If the PF (Paper Feed) motor is failing to maintain constant speed, or if the wiring harness to the register sensor has a micro-fracture, intermittent timing errors will occur. riso error a16-525
Inspect the sensors for any visible damage or blockages. Cleaning the sensors may resolve the issue if they are dirty. The Riso error A16-525 typically means the machine
When the machine finally died years later — worn out, its parts scattered into other prints and other shops — the box of scraps found a new home in a zine. The cover read: A16-525: Small Things Returned. Inside were the receipts and tickets and leaves and a short note: “For when the world forgets to keep its small things.” The Risograph’s ghost lived on, not in error codes, but in the way a neighborhood remembers what it thought it had lost. The Electrical Issue – Failing PF Drive Motor
First, physically remove the drum and verify there is no master attached. Check the master disposal unit for jams or broken transfer belts, which can prevent the master from leaving the drum area. 2. The "Sharpie Trick" (For False Errors)
Wipe the black velvet/light-absorbing strip on the drum to remove paper dust or ink buildup. The "Marker/Tape Trick":