Ryobi 3302H Operation Manual page 183

Chapter 2 Periodic Inspection
b. The pressure between the water form roller and plate (A)
Checking procedures
Apply ink on the roller thinly and run the press. Push the water
and ink form roller ON button to contact the water form roller with
the plate surface.
After running the press for a few minutes, stop the press. (The
press stops at the position where the plate cylinder gap faces the
blanket cylinder gap.)
After a few seconds, push the water and ink form roller OFF button
to release the water form roller from the plate surface.
Push the crawl button and then check the nip width that appears on
the plate surface.
Maintenance Edition - 17