Locate the rubber compression rollers inside the disposal area.
Did the error happen after changing a master roll, or during a long print run?
The is a common mechanical and sensor issue on Risograph digital duplicators—such as the RZ, EZ, MZ, and SF series —that explicitly means the machine is waiting for the master to be removed from the print cylinder (drum) . This error code flags a disruption in the master disposal process, signaling to the machine's logic board that an old master template is either physically stuck on the drum or that the master-presence sensor falsely detects one.
: The most common cause is a full master disposal box. Pull out the box, discard the used masters, and ensure it is pushed back in completely until it clicks.
Use a can of compressed air to blow away paper dust, lint, and dried ink flakes from the sensor eyes. Wipe the sensor faces gently with a dry cotton swab. Step 4: Perform a Hard Reset riso error a16-525
. While it often appears when a master is actually stuck, it is notoriously common as a "false error" on older or modified Risograph machines like the EZ and RZ series. 1. The Quick Fix: Manual Reset
Use this if you found a PDF or website that helped you solve it.
Do not wait for the machine to tell you the disposal box is full. Empty it at the start of every heavy printing shift.
Do not wait for the "Disposal Box Full" light to turn on. Empty the master disposal box at the start of every heavy printing shift. Locate the rubber compression rollers inside the disposal
For users of Risograph printers, particularly those in high-volume production, encountering error codes is a standard part of maintenance. However, some codes can be more stubborn than others. is a common, yet often frustrating, error that indicates a master-related issue on the print drum.
This is the most common cause. The PF Register Sensor is an optical device. Over time, paper dust, ink mist, and static-charged debris stick to the sensor lens. If the sensor is dirty, it cannot "see" the paper edge correctly.
Wipe the rollers thoroughly using a lint-free cloth lightly moistened with isopropyl alcohol or mild soapy water. This removes ink glaze and restores grip.
: If the black fuzzy strip is coated in wet ink, clean it thoroughly. Wet ink reflects light, tricking the sensor. This error code flags a disruption in the
or black washi tape over the strip to eliminate reflections. Replace the Strip : If it's too fuzzy or worn, the official part is the "Light Absorber Strip" (Part #023-17004). 3. Mechanical & Sensor Adjustments
The screen may display "Pull Out Print Drum and Remove Master".
Turn the machine completely off using the main power switch. Unplug the power cord from the wall outlet.