Riso ComColor X1 series Technical Manual page 167

BP Section
The position of the BP Belt edge against the Flange on the belt driven roller can only be checked at one location,at
the left-front of the BP Unit. At no other location the observation can be made. Use a MIRROR and a flashlight
to confirm the BP Belt edge position against the Flange as the belt rotates -- must be looking at the belt all through
the duration the belt is rotated by the test mode. Since the BP Belt is running, watch out for all the moving
parts to avoid injury.
MIRROR
BP Belt edge
Flange
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ComColor Series (Revision 2.4)