Ricoh LDD250, Service Manual

Page: 330 / 459

MECHANISM OVERVIEW
C262/C265 6-8 SM
Sensors
Index No. Name Function
8 Scanner HP Sensor Detects when the scanner is at home position.
10 Platen Cover Sensor Detects if the platen cover is open or closed.
11 Original Length Sensor
1, 2
13 Original Special Size
Sensor 1, 2
Detect the length of the original on the exposure
glass.
16 Original Width Sensor 1,
2 Detects the width of the original on the exposure
glass.
18 Registration Roller Press
Sensor Detects when the registration roller is in the correct
position for paper feed.
19
Registration Roller
Release Sensor Detects when the registration roller is in the correct
position for jam removal.
22 Paper Height Sensor Detects if the top of the paper stack on the paper
table is at the paper feed height.
25 Remaining Paper Sensor
1 Detects the amount of paper remaining on the
paper table.
27 Remaining Paper Sensor
2 Detects the amount of paper remaining on the
paper table.
28 Remaining Paper Sensor
3 Detects the amount of paper remaining on the
paper table.
29
Paper Table Lower Limit
Sensor Detects when the paper table is at its lower limit
position.
32 Paper Table Set Sensor Detects if the paper table is closed.
33 Paper Length Sensor Detects when long paper is on the paper table.
36 Paper End Sensor Detects when the paper table runs out of paper.
37 Friction Pad Position
Sensor 1 Checks the position of the friction pad (used for
paper separation).
38 Friction Pad Position
Sensor 2 Checks the position of the friction pad (used for
paper separation).
40
Double Feed Sensor -
Receiver
Detects paper double-feeds.
41 Double Feed Sensor -
Emitter Detects paper double-feeds.
42 Paper Registration
Sensor Detects paper approaching the registration roller.
43 Paper Feed Timing
Sensor Detects paper approaching the paper clamper in
the pressure cylinder.
49 Drum Shift HP Sensor Detects when the drum screen is at the home
position (the side-to-side image shift is 0).
51 Drum Shift Sensor
Sends the image positions data to the CPU for
display on the operation panel.
53 Ink Pump Sensor Monitors the operation of the ink pump to count
how many cycles it has moved.
57 Ink Flow Sensor Detects when the ink level is too high. This is a
backup for the ink detection pins, to prevent ink
flooding inside the drum.
58 Idling Roller HP Sensor Detects when the idling roller is at the home
position.