Ricoh DD 4450 Service Manual page 25

Sensors
No. Component
1 Scanner HP Sensor
3 Platen Cover Sensor
4 Original length sensor 1, 2
13 Master Set Cover Sensor
14 Master End Sensor
17 Paper Height Sensor
19 Paper Length Sensor
20 Paper End Sensor
21 Registration Sensor
26 2nd drum master sensor
29 Printing pressure HP sensor
39 Front Door Switching Sensor
41 Master Eject Sensor
42 Drum Master Sensor
43 Pressure Plate HP Sensor
44 Pressure Plate Limit Sensor
49 Paper Exit Sensor
SM
Function
Detects when the image sensor is at home
position.
Detects whether the platen cover is open or
closed.
Detect the length of the original on the exposure
glass.
Checks if the master set cover is properly set.
Detects when the master making unit runs out of
master roll.
Detects when the paper table reaches the paper
feed position.
Detects when long paper is on the paper table.
Detects when the paper table runs out of paper.
Detects paper approaching the registration roller.
Detects if there is a master on the drum.
Detects when the printing pressure is at the home
position.
Detects if the Front Cover is in the closed position.
Detects used master misfeeds.
Detects if there is a master on the drum.
Detects when the pressure plate is at the home
position.
Detects when the pressure plate is in the lowest
position.
Detects paper misfeeds at the exit.
1-7
Overview
C279