Lexmark 500n Control system structure, Electrical system and function, Control of print process

Page 57

5023-110

Control system structure

Electrical system and function

The engine board controls most of the main electrical parts in this printer.

No.	Control process	Function

1	Print process control	Controls print process from paper feed through paper exit.

2	Laser output control	Automatically controls laser output to the default.

3	Fuser temperature control	Controls fuser heater, allowing heated roller to reach default
		temperature.

4	Toner sensing control	Controls sensing of toner empty status.

5	Interface control (video signal)	Processes the input and output signal with external controller
		computer.

6	Operator panel indicator	Displays printer operation status.

7	Error control	Controls safe stop procedures when errors occur.

Control of print process

Control block diagram

No.	Control process	Function

1	Sequence control	Controls print sequence of printer.

2	Temperature control	Controls temperature of fuser unit.

3	Consumables’ life control	Controls toner empty status for each toner cartridge and life of periodic
		replacement parts.

4	Operator panel control	Controls operator panel indication and operator signals.

5	Error processing control	Senses errors occurring as well as stop procedures.

6	Interface control	Controls receipt and transmission of interface signals from external
		controller.

7	Laser control	Controls laser scanning and laser power.

Note: A micro CPU mounted on the engine board controls the print processes.

General information 1-35

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Contents Lexmark C500n 5023-110 United States Government Rights 12G9663Table of contents Diagnostic information Diagnostic aids Locations and connectors Vii 5023-110 Laser advisory label Laser noticesClass 1 Laser statement label Laser Laser noticeAvvertenze sui prodotti laser Avis relatif à l’utilisation de laserAvisos sobre el láser Lasermeddelelse LaserinformatieLaser-notis Huomautus laserlaitteestaLaser-melding Avís sobre el LàserJapanese laser notice Chinese laser notice Korean laser notice 5023-110 Safety information Consignes de sécuritéNorme di sicurezza Sicherheitshinweise Pautas de SeguridadInformações de Segurança Informació de Seguretat Conventions PrefaceTools required for service Maintenance approachSerial number Acronyms Resolution SpecificationsTechnical specifications Physical specifications and weightOperating clearances Packaging and shipping dimensionsPrint speed and performance Time to first printPaper and media specifications Duty cyclePrinter memory Media input types and weights Media sizes Output capacity by media and sourceMedia guidelines Envelopes PaperTransparencies LabelsConnectivity Standard Interfaces Internal Print ServersEnvironment Power and electrical specificationsPrinter identification Printer theory of operation Printer paper path Printer systems description Basic principles of color printingMechanical and electrical structures Printer component systems Basic process of color printing Print system and transfer system Structure of OPC belt photo developer cartridge Basic structure of the print system CBV DBV Charging process Details of the print systemExposing process CBV Developing processTransfer belt Aluminum drum tube Film transfer belt First transfer drum processBelt discharge erase lamp process Belt cleaning process5023-110 Second transfer paper process Details of the transfer systemTransfer belt cleaning process Description Details of the optical system Part Function Details of the paper transportation systemFusing unit Fusing process Control system structure Electrical system and functionControl of print process Print sequence diagram Laser drive control circuit 5023-110