Other Key Components - Lexmark MS312 Service Manual

Pass through sensor (option tray)
Detects when the media from the option tray passes. This will trigger the pick roller to pick the next media.
Capactive Toner Level Sensor (CTLS)
Detects the amount of toner in the imaging unit. If the toner level is low, the cartridge auger motor is triggered to add
toner from the toner cartridge to the imaging unit.
Front door sensor
Is a safety switch that cuts off a 5 V DC supply from the controller board to the LSU to prevent the laser from activating
when the front door is opened.

Other key components

Cooling fan
Discharges air from the printer to prevent excessive temperature increase.
Power supply
The power supply has two main sections: the HVPS and LVPS. The HVPS card assembly generates AC power and feeds
it to the developer roll, the transfer roll assembly and the charge roll assembly. The LVPS card assembly generates low
voltages: 5 V DC for logic circuits, 5 V DC for laser diodes and 24 V DC for cooling fans.
Controller board
Controls the printing operation based on the communication with the RIP controller and optional peripherals. It also
controls the fuser, toner dispensing, sensor switch feedback, drive motors, clutches and solenoids
Rollers
Fuser assembly
Fuser exit
roller
Duplex rear
deliver roller
Duplex front
deliver roller
Paper exit roller
Appendix C: Theory of operation
Photoconductor
drum
First input roller
Pick rollers
274
MPF pick roller
Secondary input
roller
Transfer roll
Pick rollers
Separator roll
4514