Ryobi 3302H Operation Manual page 206

Chapter 3 Periodic Maintenance
5) Cleaning the skid rollers
Foreign particles and ink adhering on the water sensor (6) electrode will
cause misfunctioning. Wipe off the electrode and the area around it with
a dry soft rag and keep it clean.
When it becomes too dirty, clean it with a rag containing water and
cleaning solution. At this time, be careful not to allow the cleaning solution
to enter the sensor body.
When the skid rollers do not rotate smoothly because dust or foreign
particles are adhered on the bearing, clean the bearing using a brush
containing cleaning solution. After cleaning it, lubricate it with a little
oil.
(Note) Wipe off any excess oil that adheres on the bearing when supplying
too much.
6) Cleaning the pull-out rollers and guide rollers
Maintenance Edition - 30
If ink adheres on the pull-out rollers and guide rollers, the roller surface
will become hard. Clean them after checking the surfaces of the rollers.