Lexmark X543 Service Manual

General information1-19
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Tools required for service
Flat-blade screwdrivers, various sizes
#1 Phillips screwdriver, magnetic
#2 Phillips screwdriver, magnetic
#2 Phillips screwdriver, magnetic short-blade
7/32 inch (5.5 mm) open-end wrench
7.0 mm nut driver
Needlenose pliers
Diagonal side cutters
Spring hook
Feeler gauges
Analog or digital multimeter
Parallel wrap plug 1319128
Flash light (optional) 

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Acronyms.
ac Alternating Current 
ACM Autocompensator Mechanism (or paper feed)
ADF Automatic document feeder
AFE Analog front end
AIO All-In-One
APS Automatic Paper Size
ASIC Application Specific Integrated Circuit
BLDC Brushless DC Motor
BOR Black Only Retract
BUD Belt up down
CCyan
CCD Charge-Couple Device
CCFL Cold Cathode Fluorescent Lamp
CCW Counter clockwise
CDB Command Descriptor Blocks
CMYK Cyan yellow magenta black
CPU Central...

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HVU High voltage unit 
Hz Hertz
INTL International
ITC Internal Tray Card
ITU Image Transfer Unit
KBlack (Key)
LAN Local area network
LASER  Light amplification by stimulated emission of radiation
LCD    Liquid cr ystal display
LCM Liquid Crystal Module
LD Laser Diode
LED Light emitting diode
LEF Long edge feed
LES Lexmark Embedded Solution (applications)
LSU Laser Scanning Unit
LV Low Voltage
LVPS  Low voltage power supply
M Magenta
MB...

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PWM Pulse Width Modulation
RAM Random access memory
RFID Radio frequency identification
RH Relative humidity
RIP Raster image processor
ROM Read-only memory
ROS Read-only storage
RPM Revolutions Per Minute
SCC Scanner Control Card
SDRAM Synchronous Dynamic Random Access Memory
SEF Short edge feed
SIMM Single Inline Memory Module
SOL Solenoid
SOS Start of scan
SRAM  Static random access memory
TAR Toner Add Roll
TPS Toner Patch Sensing
TTM...

Diagnostic information2-1
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2.  Diagnostic information
Start
Begin here to locate the service error code, user status message, user error message, symptom table, service 
checks, and diagnostic aids in this chapter to determine the corrective action necessary to repair a 
malfunctioning printer. They will lead you to solutions or service checks, including use of various tests.
Does the POR stop? Check the “POR (Power-On Reset) sequence” on page 2-2
Do you have a...

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POR (Power-On Reset) sequence
The following is an example of the events that occur during the POR sequence for the base machine with no 
paper-handling options installed.
When you turn the printer on, it performs a Power-On Self Test. Check for correct POST functioning of the base 
printer by observing the following:
1.The LED turns on.
2.The main fan turns on.
3.The operator panel turns on.
4.A partial row of pixels appears.
5.The operator...

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Symptom tables
Printer symptom table
Symptom Action
Dead printer Go to “Dead printer service check” on page 2-37.
Operator panel—one or more buttons do 
not work.Go to “One or more operator panel buttons fail” on 
page 2-44.
Operator panel—display is blank. Printer 
sounds five beeps.Go to “Operator panel display blank, five beeps” on 
page 2-44.
Operator panel—display is blank.  Go to “Operator panel display blank, five beeps” on 
page...

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Scan / fax / copy symptom table
Symptom Action
840.xx scanner error Go to “840.xx service check” on page 2-63.
ADF won’t duplex (Duplex ADF only) Go to “ADF Duplex service check” on page 2-69.
ADF skew Go to “ADF feed errors service check” on page 2-69.
Multiple pages feed into ADF
Documents wont feed into ADF
Scanner makes buzzing noise on startup or 
during a scan.Go to “Flatbed home position service check” on page 2-66.
Document feeds, but...

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Print quality symptom table
Symptom Action
Background Go to “Print quality—background” on page 2-51.
Blank page Go to “Print quality—blank page” on page 2-52.
Blurred or fuzzy print Go to “Print quality—blurred or fuzzy print” on page 2-54.
Half-color page Go to “Print quality—half-color page” on page 2-54.
Horizontal banding Go to “Print quality—horizontal banding” on page 2-54.
Horizontal line Go to “Print quality—horizontal line” on...

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Error codes and messages
User status and attendance messages
User status and attendance messages
User primary message Explanation
Calibrating The printer is performing a color adjustment.
Close Door Message clears when upper and lower doors are closed.
Insert Tray  This message is displayed when the printer requests the user to insert tray x before it 
can continue printing the job. The printer needs to pick media from the missing tray or 
the...