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Riso Error A16-525

The Riso error A16-525 is a common "service call" code on Risograph digital duplicators, typically indicating that the machine is awaiting master removal from the print cylinder. While it primarily signals that a used master is still attached to the drum when the machine expects it to be gone, it often appears as a "false" error even when no master is present. Common Causes of Error A16-525

When this error appears, the machine immediately halts all printing operations. Ignoring the cause or failing to reset the system properly can lead to damaged print heads, creased paper, or repeated mechanical failures. riso error a16-525

7. When to Call a RISO Technician

  • You have replaced the home sensor and belt, but error persists.
  • Multiple drums show A16-525 (points to main drive or control board).
  • Machine is under warranty or service contract.

3. Initial User-Level Checks (No Tools Required)

| Step | Action | What to look for | |------|--------|------------------| | 1 | Power cycle the machine completely. | Wait 30 seconds after power off before restarting. | | 2 | Open front cover and check for jammed paper near drum area. | Remove any scraps, especially near sensors on left/right sides. | | 3 | Remove and reseat the error-indicated drum unit. | Pull drum out halfway, push back in firmly until it clicks. | | 4 | Check drum lock lever is fully closed. | Loose drum lock will misalign home sensor reading. | The Riso error A16-525 is a common "service

: The sensor works by shining light on a small black velvet or felt strip to the right of the clamp. If this strip is worn, fuzzy, or reflected, the sensor thinks a master is present. black Sharpie to darken the strip or apply a piece of black gaffer tape or washi tape over it to absorb the light. Check Drum Position You have replaced the home sensor and belt,

Warning: Attempting to disassemble the PF drive unit without the service manual can knock the main timing off permanently, leading to costly head strikes.