Lexmark X 850 Owners Manual

Safety information xxi
7500-XXX
Informació de Seguretat
•La seguretat daquest producte es basa en lavaluació i aprovació del disseny original i els components 
específics.  
El fabricant no es fa responsable de les qüestions de 
seguretat si sutilitzen peces de recanvi no autoritzades. 
•La informació pel manteniment d’aquest producte està orientada exclusivament a professionals i no està 
destinada 
a ningú que no ho sigui.
•El risc de xoc elèctric i de danys personals pot augmentar durant el procés de...

 xxiiMFP Service Manual 7500-XXX
Preface
Service information for the Lexmark X850e, X852Ee, and X854e is contained within two service manuals:
•MFP Service Manual–Contains specific service information for the MFP and includes the options error 
codes.
•Options Service Manual–Contains specific service information for the 2X 500-Sheet Drawer (2TM), High 
Capacity Feeder, and Finisher.
This manual contains maintenance procedures for service personnel. It is divided into the following chapters:
1.General...

General information1-1
7500-XXX
1.  General information
The Lexmark™ X850e, X852e, and X854e MFP are high-performance departmental monochrome MFPs with 
reliable, high-capacity input designed to meet the needs of rigorous business applications. Automatic 2-sided 
printing is included as a standard features. This manual is a standard service manual containing information 
required for maintenance.
Printer technology
•Monochrome laser
Print speed
•X850e: Up to 35 ppm
•X852e: Up to 45 ppm
•X854e: Up to 55...

1-2MFP Service Manual 7500-XXX
Operating systems — printer driver
•Microsoft® Windows® 
•Linux®
•Mac® OS
•Novell
•UNIX
Emulation
•PCL® 6 emulation
•PostScript® 3
•PPDS Migration Tool
Fonts
•PCL 6 emulation
—Scalable: 89 (84 plus 5 special)
—Bit mapped: 2
•PostScript 3 emulation
—Scalable: 158
•PPDS
—Scalable: 39 
—Bit mapped: 5
•PDF 1.5
Paper capacity
•Input 
—Standard: 3 sources for 3,100 sheets
—Maximum: 4 sources for 5,100 sheets
•Output 
—Standard: 1 bin for 500 sheets
—Maximum: 2 bins — one with...

General information1-3
7500-XXX
Media types
•Plain paper, envelopes, card stock, transparencies, paper labels
Media weights
•Plain paper: 17 to 28 lb.
•Card stock: Up to 90 lb. index 
Size and weight — without finisher
•Size: W x D x H — 25 x 26 x 33 in. (640 x 649 x 832 mm)
•Weight: 233 lb. (106 kg)
Duty cycle
•Printer
—200,000 pages per month maximum, based on a single-month’s usage
•Standard warranty
—One year On Site or 600,000 pages, whichever comes firs 

1-4MFP Service Manual 7500-XXX
Printer overview
CAUTION: Do not set up this product or make any electrical or cabling connections, such as the power cord or 
options and features, during a lightning storm. 
Basic model 
The following illustration shows a printer with its base features.
Duplex unit
Multipurpose
feeder
(MPF)
Tray 1 and tray 2
(500 sheet trays)Tray 3 and tray 4
850+1150 sheet dual
input tray (TTM) Operator
panel
ADF
Exit 2 (used in
conjunction with
duplex unit) 

General information1-5
7500-XXX
Configured model 
The following illustration shows a fully configured printer. Items denoted with an asterisk (*) are options. 
Exit 2
(Used in conjunction
with duplex unit)
Duplex unit
Multipurpose
feeder
(MPF)
Tray 5*
(2000 sheet high
capacity feeder)
(HCF)
Tray 1 and tray 2
(500 sheet trays)Tray 3 and tray 4
850+1150 sheet dual
input trays (TTM)Finisher* Operator
panel
Bridge unit*
(Used in conjunction
with finisher)ADF 

1-6MFP Service Manual 7500-XXX
Printer theory
Driving force transmission path
Media transport motor
The rotating force of the transport motor is transmitted through the gear and the pulley (25 tooth) to components 
that need mechanical driving force as shown in the following diagram.
The driving force transmitted to the gear drives the transport roll assembly, multipurpose feeder (MPF) feed roll, 
registration roll assembly, fuser assembly, and exit 1 media exit roll assembly through the clutch and...

General information1-7
7500-XXX
PC cartridge motor
The rotating force of the PC cartridge motor is transmitted through the gears to components that need a 
mechanical driving force as shown in the following diagram.
The driving force transmitted to the PC cartridge drives the drum. The driving force is then transmitted to the 
transfer roll assembly by direct contact with the drum.
PC cartridge motor
Drum
Transfer rollMagnetic Roll 

1-8MFP Service Manual 7500-XXX
Media transport
Media transport path
Media is supplied from the MPF, tray 1 or tray 2, and is transported to the printer along the media transport path 
shown below. 
MPF
MPF pick roll
MPF Transport Roll ASM
MPF ASMMedia feed
unit ASMMedia feed
unit ASM Pick roll Pick roll
Separation roll Separation roll
Feed roll
Media transport roll ASM
Registration roll ASM
Transfer roll ASM
PC cartridge Drum
Heat roll
Pressure roll
Fuser unit ASM
Exit 1 media exit roll ASM
Duplex media...