The Riso error signifies that the machine is "Waiting for the master to be removed" from the print cylinder (drum). This usually occurs when the sensor detects a master still attached to the drum after a disposal cycle or fails to recognize that a master has been removed. Common Causes
Wipe them down with a lint-free cloth dampened with a small amount of isopropyl alcohol or mild soapy water to remove tacky ink.
If the error returns immediately after a reset, a technician should evaluate the following parts:
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
To help diagnose this more accurately, could you tell me the of your Riso machine (e.g., GR, FR, RP, RZ, or SF series)? Knowing if you hear any grinding noises when it errors out would also help narrow down the cause. Share public link
- Action: Open the machine's front door and gently pull out the print drum (cylinder). - What to do: Carefully inspect the entire surface of the drum for any remaining master material. Pay close attention to the master clamp area. Remove any and all fragments you find. Use a soft, lint-free cloth to wipe down the drum, especially the area around the master clamp. - After cleaning: Push the drum all the way back into the machine, close the door, and turn the machine back on. Often, this simple act is all that's needed.