Ricoh BR-C1a Basic Service Training page 37

 A sensor at the upper right corner of the ITB unit monitors the
rear edge of the belt to check its position.
 If the belt goes off center, a motor, roller, and cable mechanism
corrects the position of the belt.
 This is the same as the Taurus. However, the overrun sensors at
Slide 37
No additional notes
ITB Centering Control
the front and rear edges of the belt have been eliminated, along
with the ITB speed sensor.
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BR-C1 Training