Riso Error A16-525 ((install)) -

If physical cleaning doesn't work, you may need to clear the machine's state:

: 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. riso error a16-525

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 physical cleaning doesn't work, you may need