Ricoh C252 Service Manual page 114

MECHANISM OVERVIEW
Sensors
No.
3 Cutter HP Sensor
8 Master Set Cover Sensor
Master End Sensor
9
10 Registration Sensor
Document Sensor
15
Pressure Plate HP Sensor
16
Pressure Plate Limit Sensor
17
18 Master Eject Sensor
19 Drum Master Sensor
24 Eject Box Set Sensor
25 Paper Exit Sensor
28 Clamper Open Sensor
32 Feed Start Timing Sensor
36 Clamper Closed Sensor
Master Eject Position (Drum
38
HP) Sensor
Others
No.
Contact Image Sensor (CIS)
1
6 Thermal Head
Paper Feed Clutch
35
C252
Component
Component
Function
Detects when the cutter is at the home position.
Checks if the master set cover is properly set.
Detects when the master making unit runs out of
master roll.
Detects paper approaching the registration roller.
Detects the leading edge of the original to
determine when to turn off the scanner motor.
Checks for original misfeeds.
Detects when the pressure plate is at the home
position.
Detects when the pressure plate is in the lowest
position.
Detects used master misfeeds.
Detects if there is a master on the drum.
Checks if the master eject box is installed.
Detects paper misfeeds at the exit.
Detects if the clamper is in the open position.
Determines the paper feed start timing.
Detects if the clamper is in the closed position.
Detects when the drum is at the master eject
position.
Function
This sensor reads and converts the light reflected
from the document into an analog video signal.
Burns the image onto the master.
Transmits main motor drive to the paper feed
rollers at the appropriate time.
6-4 SM