Ricoh Di-C1 Manual page 204

ITB Contact and Release - 1
Cam
The belt always contacts the K drum.
To move the belt away from the K drum, turn the release lever
clockwise. Do this to remove the transfer belt unit, or you will
damage the K drum.
The belt contacts the CMY drums for colour printing only.
If a black-and-white page comes in the middle of a colour job, the
belt does not move away from the CMY drums.
Slide 204
This mechanism makes the drums and transfer belt life longer.
If a black-and-white page comes in the middle of a colour job, the belt does
not move away from the CMY drums.
This keeps the printing speed at the maximum, because it takes time for
the motor to move the belt up and down.
If a colour page appears in the same job after black-and-white pages, the
machine waits until the previous page has left the transfer unit. Then it
moves the belt up against all four drums.
The ITB contact sensor detects the status of the ITB (contacting K only, or
contacting all four drums).
ITB Contact
Motor
ITB Contact
Sensor
204
Di-C1 Training