Brother HL-2700CN Series, Service Manual, Page: 85 / 377

IV-32
(4) Sensors
No. No. No. 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 Fuser 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 printer setting
location.