Belt Mark Detection - Ricoh A66 Service Manual

TRANSFER BELT UNIT

7.3.4 Belt Mark Detection

[B]
[A]
The transfer belt H.P. sensor [A] aligns the position of the image on the belt
for each color. The use of this sensor allows the belt transfer unit mechanism
to be more simpler than in other machines (e.g. the switchback mechanism
for A109 copiers is not needed). So, in this machine, the transfer belt only
needs to rotate one way during copying. This sensor is also used for the
paper registration timing.
The photosensor detects the belt mark [B] which is a gold-colored patch on
the edge of the belt. The patch at the front of the belt has a white mark. This
mark should always be at the front when installing a new belt.
SM 2-103 A166/A187/A189