Control System Structure; Electrical System And Function; Control Of Print Process - Lexmark C500n Service Manual

Control system structure

Electrical system and function

The engine board controls most of the main electrical parts in this printer.
No. Control process
1 Print process control
2 Laser output control
3 Fuser temperature control
4 Toner sensing control
5 Interface control (video signal)
6 Operator panel indicator
7 Error control

Control of print process

Control block diagram
No. Control process
1 Sequence control
2 Temperature control
3 Consumables' life control
4 Operator panel control
5 Error processing control
6 Interface control
7 Laser control
Note: A micro CPU mounted on the engine board controls the print processes.
Function
Controls print process from paper feed through paper exit.
Automatically controls laser output to the default.
Controls fuser heater, allowing heated roller to reach default
temperature.
Controls sensing of toner empty status.
Processes the input and output signal with external controller
computer.
Displays printer operation status.
Controls safe stop procedures when errors occur.
Function
Controls print sequence of printer.
Controls temperature of fuser unit.
Controls toner empty status for each toner cartridge and life of periodic
replacement parts.
Controls operator panel indication and operator signals.
Senses errors occurring as well as stop procedures.
Controls receipt and transmission of interface signals from external
controller.
Controls laser scanning and laser power.
5023-110
1-35
General information