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: There is a small black velvet strip on the drum meant to absorb sensor light. If this strip is worn, dusty, or missing, the sensor detects reflection from the metal drum instead.
[ Optical Sensor in Machine ] │ │ (Emits Light) (Reads Reflection) ▼ ▼ ┌────────────────────────────────────────┐ │ Drum Surface │ │ [Clamp] [Non-Reflective Black Strip] │ └────────────────────────────────────────┘
: Wipe the sensor (located above the drum area) to remove any ink or dust that might be causing a false reading. Troubleshooting "False" Errors
: Turn the machine off, remove the master disposal box, and turn the machine back on. Test Mode Reset
The master is physically stuck on the drum or didn't reach the disposal box.
Locate the master disposal unit (usually adjacent to the print drum area).
If the box was empty, a master sheet is likely jammed inside the transport channel. Open the front cover of the machine.
Follow these steps in order to clear the error and resume printing. 1. Perform a Proper Physical Check
Hopefully, this guide has provided a clear path to diagnosing and resolving the A16-525 error on your RISO machine. The good news is that most cases are resolved by a simple and careful cleaning of the drum and its sensors. However, when hardware fails, or the problem persists, calling a certified technician is always the safest and most effective course of action. They have the specialized tools, parts, and expertise to get your duplicator back to its productive best.
If there is no physical jam, a blind sensor is likely misreporting a jam.
