(typically in the range of -80 to +80) to ensure the sensor aligns perfectly with the absorber strip. Replace Parts: If the strip is severely damaged, you may need a new Light Absorber Strip (Part #023-17004). Are you using an aftermarket screen original RISO drum , and did this error start after a specific master jam?
Ink or dust on the drum's sensors can cause false readings.
If you have more details about the machine model or additional context about when the error occurs (e.g., during a specific operation), I might be able to provide more targeted advice. riso error a16-525
If there is no physical jam, a blind sensor is likely misreporting a jam.
Follow these steps in order to clear the error and resume printing. 1. Perform a Proper Physical Check (typically in the range of -80 to +80)
The official service manual defines as: "Awaiting master removal — Master remains on print drum."
: If the drum's "Position-A" is slightly off, the sensor may look at the wrong part of the drum (like the metal surface) instead of the black absorber strip. Troubleshooting and Fixes 1. Immediate Physical Check Ink or dust on the drum's sensors can cause false readings
Does the error happen on or just one specific drum?
: The machine uses an optical sensor to detect masters. If the sensor is dirty or blocked, it may falsely report a master is present.
1. Turn off the main power switch of the Riso machine. 2. Remove the current problematic drum from the housing. 3. Remove the master disposal box completely. 4. Hold down the yellow "Reset" button on the control panel. 5. Turn the power switch back ON while continuing to hold the Reset button. 6. Keep holding the button for 4-5 seconds until the machine initializes. 7. Reinsert the disposal box and slide the drum back into place.
In rare cases, the motor driving the disposal rollers may fail. When you attempt to make a master, listen closely to the machine. If you do not hear the distinct whirring of the disposal mechanism right before the "A16-525" code appears, the motor or its drive belt may need replacement by a certified technician. Proactive Tips to Prevent Future A16-525 Errors