5-4 Service Manual
7100-XXX
Electronic components
Printer engine sensor locations
Name Code Function
Paper size sensor
PSU
Detects paper size.
Registration sensor
PT1
Detects whether paper is fed from paper drawer.
Fuser exit sensor
PT2
Detects when paper exits from rear cover assembly.
Tray empty sensor
PEU
Detects if paper is loaded in paper drawer.
OPC marker sensor
PBS
Detects connecting position of OPC belt.
Toner empty sensor
TPD/TTR
Detects if any toner cartridge is empty.
Waste toner sensor
WTS
(LED/TR)
Detects when waste toner bottle is full.
Temperature sensor for fuser
unit
TH
Thermistor that detects fuser temperature.
Output tray full sensor
PFUL
Detects when paper exit tray is full.
Toner key sensor
TNK
Detects presence of toner cartridge.
Toner density sensor
TDS
Detects toner density of images formed on the transfer belt
surface.
Room temperature thermistor
sensor
RTS
Detects ambient room temperature.
Transfer unit sensor
TBS
Detects irregular rotation of transfer belt.
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