Before you begin, ensure the machine is turned off and unplugged to prevent any accidental electrical shocks or mechanical movements.
Allow the components to dry completely before reinserting the drum. Step 4: Reset the Machine
First, physically remove the drum and verify there is no master attached. Check the for jams or broken transfer belts, which can prevent the master from leaving the drum area. 2. The "Sharpie Trick" (For False Errors)
If the error occurs on a bare drum, the light absorber strip is the primary culprit. riso error a16-525
Locate the optical sensor nearby (usually a small plastic piece with an infrared eye). Wipe it gently with a dry cotton swab to clear off any paper dust or ink mist. Step 4: Inspect the Drum Gripper Pad
This black fuzzy or velvet strip near the drum clamp absorbs light; if it is worn out, "fuzzy," or missing, the sensor may see a reflection from the drum surface and assume a master is present.
Wipe the black velvet/light-absorbing strip on the drum to remove paper dust or ink buildup. The "Marker/Tape Trick": Before you begin, ensure the machine is turned
Enter the diagnostic code for your specific Riso model (typically code or 120 on modern series) using the keypad to test the disposal motor function. Press Start to run the test, then press Reset to exit. Hardware Components to Inspect
I can provide the exact test mode codes or structural diagrams tailored to your specific model.
. It occurs when the machine's sensors detect a master remains on the drum after a disposal cycle, even if the drum appears empty. Common Causes Sensor Detection Failure: Check the for jams or broken transfer belts,
The drum has shifted slightly out of its precise home orientation (Position-A), causing the sensor to misread the drum surface.
If the screen cloth on the drum has been replaced with an aftermarket version, it might not be seated properly, or it might be triggering the sensor incorrectly.
The optical sensor that looks for the master sheet is blinded by ink or paper debris.
1 Star. Would not recommend.