Ricoh Di-C1.5a Manual page 206

ITB Contact and Release - 2
Cam
The motor moves the left end of the belt up and down, through a
cam.
Up: The belt contacts the K drum only
Down:The belt contacts all four drums
The sensor detects when the belt contacts all four drums.
Sensor off: ITB contacts all drums
Slide 206
The following explains how the sensor and motor operate to initialize the
machine, and during different types of printing.
The ITB contact sensor operates as a detection sensor during machine
initialization, and as a position sensor during machine operations.
Before machine initialization, the left side of the image transfer belt is in the
home position. When initialization starts, the ITB contact motor lowers the
left side until the actuator has passed the sensor. Then ITB contact motor
lifts up the left side to its home position. This action actuates the sensor in a
certain pattern.
The sensor actuation patterns are as follows.
Initialization: On - Off - On - Off - On
Operation - Standby (Default): On
Operation - B/W printing: On
Operation - Color Printing: Off
On: The actuator is out of the sensor.
Off: The actuator is interrupting the sensor.
ITB Contact
Sensor
206
Di-C1.5 Training
ITB Contact
Motor