Confidential
3-30
(4) Sensors
No. Name Code Function
1 Paper Size Sensor PU PSU Photo sensor to detect the paper size.
2 Registration Sensor PU PT1 Photo sensor to detect the paper is fed
from the paper tray.
3 Fuser Exit Sensor PU PT2 Photo sensor to detect that paper is exited
from the paper exit unit.
4 Tray Empty Sensor PU PEU Photo sensor to detect if paper is loaded
or empty in the paper tray.
5 OHP Sensor PU OHP Photo sensor to detect that material in the
paper tray is OHP.
6 Toner Density
Sensor PU
TDS Photo sensor to detect the toner density of
images formed on the transfer belt
surface.
7 Transfer Unit Sensor PU TBS Photo sensor to detect irregular rotation
of the transfer belt.
8 OPC Marker Sensor PU PBS Photo sensor to detect the connecting
position of the OPC belt.
9 Toner Sensor PU TPD/TTR Photo sensor to detect if the toner is
empty or not for each toner cartridge.
10 Waste Toner Sensor PU WTS
(LED/TR)
Photo sensor to detect that the waste toner
bottle is full of waste toner.
11 Temperature Sensor
for Fusing unit
TH Thermistor to detect the fuser
temperature.
12 Output Tray Full
Sensor PU
PFUL This is the sensor to detect that the paper
exit tray is full of exited papers.
13 Toner Key Sensor PU TNK To detect the availability of key to be
provided to the toner cartridge.
14 Room Temp. Thermistor
Sensor PU
RTS Sensor to detect the ambient temperature
of the machine setting location.
15 ADF Rear Sensor Sensor to detect the document length, and
that the document is sent to the ADF.
16 ADF Front Sensor Sensor to detect that the document is on
the ADF.
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