Ricoh Ch-C1 Series Service Training page 425

Paper Thickness Detection
 There is an encoder inside the sensor.
 The sensor uses this encoder to measure the angle of the
actuator.
 The machine uses this angle to calculate the thickness of the
paper.
 If the thickness is outside the range for the selected paper type,
feed stops, and error J098 is displayed.
Slide 425
 This type of sensor is more accurate for measuring thickness than a
photointerrupter.
Inside the Sensor
Actuator
425
Ch-C1 Training
Encoder