Printer Overview - Lexmark W820 Service Manual

Find the Cause of the Problem
1.
2.
3.
4.
Correct the Problem
1.
2.
Final Checkout
Test the printer to be sure you corrected the initial problem and there are no additional
problems.

Printer Overview

•
•
•
•
•
•
•
1-6
Service Manual
Use the "Service Flowchart" on page 1-5
Checks.
Use the "Service Checks" on page 2-11
Use the "Connector Locations" on page 5-1
Take voltage readings at various test points.
Use the "Parts Catalog" on page 7-1
Use the "Removal and Replacement Procedures" on page 4-2
The printer is a 45 page per minute (35 page per minute for X830e) black and white,
600 dots per inch laser printer that uses a data-modulated laser beam, standard dry-
ink xerographic imaging processes, and heat and pressure fusing to place a
computer generated image onto the surface of a sheet of plain paper.
The printer uses a semiconductor laser in the Printhead to generate a 5 milliwatt
infrared laser beam. Image data sent from the host computer modulates the beam,
creating a latent image on the surface of the electrically charged xerographic drum.
The printer runs on 110VAC @ 60 Hz or 220VAC @ 50Hz using approximately 900
watts during an average print cycle. Two power supplies within the printer convert AC
line voltage to the various AC and DC voltages that are needed for printer operation.
Safety circuits within the printer remove power to the printer whenever the Left Front
Cover is open or the EP Cartridge is removed.
The Machine Control Unit PWB (MCU PWB) controls all printer functions, houses
printer diagnostics, stores operating parameters, and signals printer errors.
The ESS (Controller) PWB interfaces a host computer with the MCU PWB (Engine
Card).
The printer has one Customer Replaceable Unit, or CRU, that the customer must
replace at specific intervals. That CRU is the EP Cartridge. The printer displays an
error code when it is time to replace the EP Cartridge.
4025-XXX
to find out how to use the Service
to check printer components.
to locate P/Js and test points.
to locate the FRU number.
to replace a FRU.