Lexmark 5021-0XX manual Printer circuit board locations, Name Function

5021-0XX

Printer circuit board locations

Erase lamp

Operator panel

I/O board

HVPS

LVPS

Engine controller board

Name	Function
Engine controller	Controls the following printer processes
board	Fuser temperature control
	Laser output control
	Operator panel indication
	Toner empty sensing control
	Error processing control
	Interface control
Operator panel	Displays the printer operation status and supports the
	manual input switch.
Erase lamp	Discharges OPC belt located in the photodeveloper
	cartridge.
I/O board	Relays signals between the controlled parts and
	engine controller board and drives the controlled
	parts.
Low voltage power	Provides power to control the printer.
supply (LVPS)
High voltage power	Provides power necessary for the printing
supply (HVPS)	process.

5-6Service Manual