2-20 Phaser 7400 Color Printer Service Manual
Tray 1 (MPT) Home
Position Sensor
Detects the position of the Tray 1 (MPT) Turn Clutch
for pick operations.
On: not home
Off: home
Transfer Unit Belt
Rotation Sensor
Used to count Transfer Unit belt revolutions. Voltage pulse
Color Registration
Sensors
Monitors color registration pattern produced during
automatic color registration processing.
Reference voltage
Fuser Release
Sensor
Detects the presence of the Fuser. On: absent
Off: present
Waste Toner Auger
Rotation
Detects Waste Toner Manifold Auger rotation. Voltage pulse
Waste Toner
Reservoir Auger
Rotation
Detects Waste Toner Reservoir Auger rotation.
Provides count signal for cartridge life.
Voltage pulse
Waste Toner
Reservoir Full
Detects when the Waste Toner Reservoir is full. On: full
Off: not full
Transfer Unit
Entrance Sensor
Detects media leaving Registration Roller #1. On: media present
Off: media absent
Registration Sensor
#1
Detects media at Registration Roller #1. On: media present
Off: media absent
Duplex Entrance
Sensor
Detects media entering the Duplex Unit. On: media present
Off: media absent
Duplex Reverse
Sensor
Detects the trailing edge and signals the Duplex
Gate Solenoid to switch position.
On: media present
Off: media absent
Duplex Front Sensor Detects the trailing edge and exit from the Duplex
Unit.
On: media present
Off: media absent
Duplex Rear Sensor Detects the leading edge following inversion. On: media present
Off: media absent
Toner Cartridge
CRUMs
Detects the type of Toner Cartridge installed. Data
Low Toner Sensors Detects full, low, and empty state of Toner
Cartridges.
Sensor state
transition timing
Imaging Unit Drum
Phase Sensors
Detect the position of the Imaging Unit drums. On: absent
Off: present
Lift Uplink Sensor Detects the position of the Lift Uplink On: IUs up
Off: IUs down
OHP Sensor Detects the presence of transparency media. On: opaque
Off: transparent
Paper Size Switches Detects the size of media loaded in the universal
trays.
See chart.
Feeder
Registration Sensor
Detects media at the universal tray’s Registration
Roller.
On: media present
Off: media absent
Feeder
Level Sensor
Detects the lift position of media in the universal
trays.
On: media present
Off: media absent
Sensor Functions (Continued)
Sensor Function Sensor State