
C. Functional parts
(1) Sensor, detector
No.
Parts
Note
Code Signal name Name Type Function/operation Active condition
1 MHPS MHPS Scanner home position
sensor
Photo
transmission
sensor
Detects the scanner home position.
This signal is used to control image
scanning operation.
HIGH (5V) when the
home position is
detected.
2 SL SENSOR PDA/PDK Scanner lamp light
quantity sensor
Photo diode Detects the scanner lamp light
quantity. This signal is inputted to the
scanner lamp control PWB to control
the scanner lamp drive voltage to
maintain a constant level of light
quantity.
Analog signal (0 ∼ 0.5V)
3 PAPER SIZE
SW
PAPER SIZE
IN
Paper width detector Mechanical
switch (Micro
switch)
Detects the paper width. This signal is
used to control the laser beam
radiation area.
LOW (0V) when the
max. width is detected.
4 PE SENSOR PEMP IN Paper empty detector Photo
transmission
sensor
Detects paper on the paper tray. LOW (0V) when paper
is detected.
5 SYNC SYNC IN Laser beam sensor Bin diode Detects the laser beam position. This
signal is used to control the left image
print start position.
LOW (0V) when laser
beam is detected.
6 CCD SENSOR CCD OUT CCD (image) sensor CCD Scans document images (photo
signals) and converts them into
electrical signals.
Digital signal (8Bit)
7 PIN SENSOR PIN Paper in detector Photo
transmission
sensor
Detects whether the fed paper is
transported to the transfer position or
not.
LOW (0V) when paper
is detected.
8 TS TS IN Toner empty sensor Photo
transmission
sensor
Detects remaining toner in the
developing cartridge.
HIGH (5V) when toner
empty is detected.
9 RTH RTH IN Fusing temperature
sensor
Thermistor Detects the fusing roller surface
temperature.
Analog signal (2.0 ∼
5.0V)
10 POUT POUT IN Paper exit detector Photo
transmission
sensor
Detects discharge of paper. LOW (0V) when paper
is detected.
11 DSW DSW Front cover open/close
switch
Micro switch Turns on/off the +24V power line
(power source for the motor, the high
voltage PWB, and solenoids) when
opening/closing the front cover for
safety. (Detects open/close of the front
cover at the same time.)
Close
8) TS
9) RTH
10) POUT
11) DSW
1) MHPS
2) SL SENSOR
7) PIN SENSOR
6) CCD SENSOR
3) PAPER SIZE SW
4) PE SENSOR
5) SYNC
FO-3800M
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