Brother HL-3450CN Service Manual page 88

(4) Sensors
No. Name
1 Paper size sensor
2 Paper feeding sensor
3 Paper exit sensor
4 Paper empty sensor
5 Oil sensor
6 OHP sensor
7 Drum jam sensor
8 Drum encoder sensor
9 Belt sensor
10 Toner sensor
11 Waste toner sensor
12 Home position sensor
13 Cleaning roller sensor
Temperature sensor
14
for fusing unit
15 Paper full sensor
16 Toner key sensor
Code
PSU Photo sensor to detect the paper size.
Photo sensor to detect when paper is
PS 1
fed from the media cassette.
Photo sensor to detect that paper is
PS 2
exited from the paper exit unit.
Photo sensor to detect if paper is
PS 3
loaded in the media cassette.
Photo sensor to detect if the fusing
OIL
unit oil is empty.
Photo sensor to detect if media in the
OHP
media cassette is an OHP.
Photo sensor to detect if paper is
DPJ
wound around the transfer drum.
Photo sensor to detect rotation of the
PS 4
transfer drum.
Photo sensor to detect the home
PBS
position of the OPC belt.
Photo sensor to detect if the toner is
TPD/TTR
empty for each toner cartridge.
WTS Photo sensor to detect if the waste
toner bottle is full of toner.
GHP1/ Photo sensor to detect the position of
GHP2 the toner cartridge.
Photo sensor to detect if the fuser
PS 5
cleaner is fitted in the fixing unit.
Thermistor to detect the fuser
TH
temperature.
The sensor to detect when the paper
PS 6
eject tray is full of paper.
The sensor to detect the key provided
TNK
in the toner cartridge.
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HL-3450CN SERVICE MANUAL
Function