Brother MFC-9420CN Service Manual page 62

(4) Sensors
No. Name
1 Paper Size Sensor PU
2 Registration Sensor PU
3 Fuser Exit Sensor PU
4 Tray Empty Sensor PU
5 OHP Sensor PU
6 Toner Density
Sensor PU
7 Transfer Unit Sensor PU
8 OPC Marker Sensor PU
9 Toner Sensor PU
10 Waste Toner Sensor PU
11 Temperature Sensor
for Fusing unit
12 Output Tray Full
Sensor PU
13 Toner Key Sensor PU
14 Room Temp. Thermistor
Sensor PU
15 ADF Rear Sensor
16 ADF Front Sensor
Code
PSU Photo sensor to detect the paper size.
PT1 Photo sensor to detect the paper is fed
from the paper tray.
PT2 Photo sensor to detect that paper is exited
from the paper exit unit.
PEU Photo sensor to detect if paper is loaded
or empty in the paper tray.
OHP Photo sensor to detect that material in the
paper tray is OHP.
TDS Photo sensor to detect the toner density of
images formed on the transfer belt
surface.
TBS Photo sensor to detect irregular rotation
of the transfer belt.
PBS Photo sensor to detect the connecting
position of the OPC belt.
TPD/TTR Photo sensor to detect if the toner is
empty or not for each toner cartridge.
WTS Photo sensor to detect that the waste toner
(LED/TR) bottle is full of waste toner.
TH Thermistor to detect the fuser
temperature.
PFUL This is the sensor to detect that the paper
exit tray is full of exited papers.
TNK To detect the availability of key to be
provided to the toner cartridge.
RTS Sensor to detect the ambient temperature
of the machine setting location.
Sensor to detect the document length, and
that the document is sent to the ADF.
Sensor to detect that the document is on
the ADF.
3 - 3 0
manuals4you.com manuals4you.com
Function
Confidential