Clean the on the drum. Use a dry cloth or a slightly damp one to remove paper dust or ink buildup that might be making it reflective. 3. The "Black Marker" or Tape Trick
Use a soft, dry cloth to clean the sensor area around the master clamp.
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.
- The master clamp is the metal bar that holds the master in place. If it's bent, it won't release the master. - Action: With the drum out, visually inspect the master clamp. Is it visibly bent or damaged? Try to move it manually; it should spring back and forth with some tension. If it feels loose or is bent, the drum will likely need professional repair. riso error a16-525
Use a soft cloth to wipe paper dust or ink off the small black velvet strip near the drum clamp. Restores the strip's light-absorbing properties. 3. The "Sharpie Trick"
Several mechanical and environmental factors can prevent a master stencil from disposing properly:
Check the entire screen, particularly near the master clamp, for any remaining plastic from the old master. Clean the on the drum
If your machine’s display is in English, it will likely show the message: "" or " Please remove the master from the drum ".
If you've tried all the steps above and the A16-525 error is still appearing, the problem likely requires professional repair. It could be a failed Master-on-Drum sensor that needs replacement, an issue with the main control board, or an internal mechanical problem.
[ Remove Drum ] ➔ [ Take Out Disposal Box ] ➔ [ Power Cycle Off/On ] ➔ [ Reinstall Components ] from the machine. Remove the master disposal box from the side of the unit. Turn the main power switch OFF . Wait 30 seconds , then turn the machine back ON . The "Black Marker" or Tape Trick Use a
Regularly clean the drum and the disposal area to remove master remnants and ink build-up.
If the error is stubborn, the issue might not be the ink, but the drum unit itself.