Lexmark E 450 Dn Service Manual

							General information1-5
4512-630
Connectivity and compatibility
Item4512-630
Lexmark E450dn
Data stream emulations
PCL 6✔
PostScript Level III✔
Host Based Printing (HBP)/GDI Version 1 n/a
Host Based Printing (HBP)/GDI Version 2✔
PPDS✔
HTMLn/a
PDF (version 1.5)✔
Compatibility Windows/Macintosh/Linux ¹
Standard local connections
Parallel (IEE 1284 bidirectional)✔
USB*✔
Standard network connections
Ethernet (10/100 Base TX) 
Optional local connections
External print server support✔
Option slots
Memory slots (100-pin DIMM) 1
Flash memory / option card 2 ²
* The E450n product is a USB 2.0 certified device supporting high-speed (480MB/sec.) data transfer.
¹ Linux support for E450dn model is utilizing the PCL data stream.
² Only one slot active for flash memory or font card 
						

							1-6Service Manual 4512-630
Types of print media
Ensure trays are properly loaded. Never mix media types within a tray. 
Source Sizes Types Weight
6Input capacity 
(sheets)²
Input tray 1
(250-sheet tray)A4, A5, A6³, JIS, B5, 
letter, legal, 
executive, folio, 
statementPaper, labels¹, 
transparencies60—90 g/m
2
(16—24 lb)250 paper
50 labels¹
50 transparencies
2nd Drawer option
(550-sheet only–
E352dn only)A4, letter, legal, A5, 
JIS, B5, executive, 
folio, statementPaper, labels¹, 
transparencies60—90 g/m
2
(16—24 lb)550 paper (20 lb)
50 labels¹
50 transparencies 
Manual feed input
7A4, A5, A6³, JIS, B5, 
letter, legal, 
executive, folio, 
statementPaper, labels¹, 
transparencies, card 
stock,
4 envelopes5
60—163 g/m2
(16—43 lb)1 sheet (all medias)
Envelopes
5: 
monarch (7 ¾), 9, 
Com-10’, C5, B5, DL
Minimum feed size: 
76 X 127mm
Universal (max) 
paper:
216 X 357mm
¹ Single sided paper labels are supported for the occasional use of less than 20 pages per month. Labels such as vinyl 
labels, pharmacy labels or dual-sided labels are not supported.
² For 20 lb print material, unless otherwise noted.
³ A6 long grain media support/short grain A6 not supported
4 Card stock up to 90# index. Designed to exit rear door. Short grain is recommended.
5 20 lb envelopes are recommended
Wrinkling may also occur on the front side, but away from address or return address areas. Slight wrinkling (nit in 
address areas) is permitted on 24# envelopes. Use envelopes that lay flat when individually placed on a table facedown. 
The distance of any edge or corner from the table should be less than 3 mm.
6 This refers to paper only. Treeing may occur on 16# paper.7 Input using manual feeder is reduced to 1/2 speed 
						

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4512-630
Tips on preventing jams 
Paper path
A Paper path A-B 117.8
B Manual feed sensor B-C 9.6
C Upper end feed rolls C-D 60.5
D Input sensor D-E 49.0
E Transfer roll E-F 110.7
F Fuser F-G 26.9
G Fuser exit rolls G-H 6.2
H Fuser exit sensor H-I 127.2
I Exit rolls I-J 26.4
J Exit sensor I-K 217.4
K Duplex unit K-L 102.5
L Duplex sensor L-M 16.2
M Auto compensator M-B 178.9
*Measurements are approximate paper lengths (millimeters)
**Sensors are measured at rotation/position which they are tripped 
						

							1-8Service Manual 4512-630
Most paper jams can be avoided by correctly loading paper and specialty media in the printer.
The following hints can help prevent paper jams:
• Do not load wrinkled, creased, or damp media.
• Never mix media types within a tray.
• Flex, fan, and straighten the media stack before loading it.
Note:Make sure the media stack is below the maximum media fill indicators on the 250-sheet tray before 
pushing the tray into the printer.
• Push all trays snugly into the printer after loading them.
• Make sure paper guides are positioned before loading the paper or specialty media.
• Do not remove trays while a job is printing. Wait for a Load Paper  light sequence.
• Before loading transparencies, fan the stack to prevent sheets from sticking together.
• Do not use envelopes that:
— Have excessive curl
— Are stuck together
— Are damaged in any way
— Contain windows, holes, perforations, cutouts, or embossments
— Have metal clasps, string ties, or metal folding bars
— Have postage stamps attached
— Have any exposed adhesive when the flap is in the sealed position
Use only recommended media. Refer to the Card Stock & Label Guide available on the Lexmark Web site 
at www.lexmark.com for more information about which media provides optimum results for the current 
printing environment.
To o l s  
The removal and adjustment procedures require the following tools and equipment:
•Spring hook
•Needle nose pliers
•Volt-ohmmeter 
•#1 and #2 Phillips screwdriver
•Slotted screwdriver
•Flashlight 
						

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Acronyms
ACM Autocompensator Mechanism (or paper feed)
ASIC Application Specific Integrated Circuit
CBM Complete Bill Of Material
CRC Cyclic Redundancy Check
DIMM Dual In-Line Memory Module
EEPROM Erasable Electrically Programmable Read-Only 
Memory
ENA External Network Adapter
FRU Field Replaceable Unit
HBP Host Based Printing 
HVPS High Voltage Power Supply
LCD Liquid Crystal Diode
LED Light Emitting Diode
LSU Laser Scanning Unit
LVPS Low Voltage Power Supply
NVRAM  Nonvolatile Random Access Memory
PC Photoconductor
PCL Printer Control Language 
POR Power-On Reset
POST Power-On Self Test
PPDS  Personal Printer Data Stream 
PRC People’s Republic of China 
PSO Participating Standards Organization
RIP Raster Image Processor
TAR Toner Add Roll
SDR Synchronous Dynamic RAM
USB Universal Serial Bus 
V ac  Volts alternating current
V dc Volts direct current 
						

							1-10Service Manual 4512-630 
						

							Diagnostics information2-1
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2.  Diagnostics information
Start
CAUTION: Unplug power from the printer before connecting or disconnecting any cable, 
assembly, or electronic card. This is a precaution for personal safety and to prevent damage to the 
printer. 
Use 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.
Symptom tables
If your machine completes the “Power—On Self Test (POST) sequence” on page 2-1 without an error and you 
have a symptom, go to “Messages and error codes” on page 2-5. Locate your symptom, and take the 
appropriate action.
Service errors (9xx.xx’s)
If a service error code appears while you are working on the machine, go to “Messages and error codes” on 
page 2-5, and take the indicated action for that error.
Service error codes are indicated by a three-digit error code followed by a period and additional numbers in the 
format XXX.YY. In most cases, five digits are shown. 
User status and attendance messages
•
User status messages provide the user with information on the current status of the printer. Ready displays 
on the first line of the display unless invoked, and then Power Saver displays. If a user status message is 
displayed, go to “Messages and error codes” on page 2-5.
•User attendance messages are indicated by a two- or three-digit error code that provides the user with 
information that explains a problem with a print cartridge, paper jam, option, port, and so on. If a user error 
message displays, go to “User attendance messages” on page 2-5 and “Paper jam error codes (200-
series)” on page 2-8.
Power—On Self Test (POST) sequence
The following is an example of the events that occur during the POR sequence when the printer is turned on.
1.Diamonds are displayed on the operator panel. 
2.While code is being loaded into DRAM, dots scroll across the operator panel.
3.A screen is displayed with the memory and processor speed. A typical example of this message is:
4.Performing Self Test is displayed.
5.Busy is displayed.
6.Close Door will be displayed if the cover is open.
7.Any cartridge errors, such as Defective Cartridge, are displayed.
8.Applicable maintenance messages are displayed. 
9.Applicable toner low messages are displayed. 
10.The printer displays Ready.
*64MB 
						

							2-2Service Manual 4512-630
Overview of the operator panel and menus
The operator panel on your printer is a 4-line, back-lit, grayscale display that can show both graphics and text. 
The Back, Menu, and Stop buttons are located to the left of the display, the navigation buttons are located 
below the display, and the numeric pad is located to the right of the display.
The use of the buttons and the layout of the display panel are described in the following table.
Operator panel
Button Function
Back Press the Back button to return to the last screen you viewed.
Note: Changes made on the screen will not be applied if you press the Back 
button.
Menu Press the Menu button to open the menu index. 
Note: The printer must be in the Ready state to access the menu index. A 
message indicating the menus are unavailable will appear if the printer is not 
ready.
Stop Press Stop to stop the mechanical operation of the printer. After pressing Stop, 
the message Stopping is displayed. When the printer has stopped, the status 
line in the operator panel will show Stopped, and a list of options will appear.
Indicator lightNavigation buttonsLCD
Select Back
Menu
Stop 
						

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Navigation buttonsThe Up or Down buttons are used to move up and down lists.
When navigating through a list using the Up or Down button, the cursor 
moves one line at a time. Pressing the Down button at the bottom of the 
screen changes the screen to the next whole page.
The Left or Right buttons are used to move within a screen such as 
moving from one menu index item to another. They are also used to 
scroll through text that will not fit on the screen.
The Select button is used to initiate action on a selection. Press Select 
when the cursor appears next to the selection you want such as 
following a link, submitting a configuration item, or when you want to 
start or cancel a job.
Display panelThe display panel shows messages and graphics describing the current state of 
the printer and indicating possible printer problems you must resolve.
The top line of the display is the header line. If applicable, it will contain the 
graphic indicating the Back button can be used. It will also display the current 
status, and the Supplies (Warnings) status. If multiple warnings are present, 
each warning will be separated by a comma.
The other three lines of the display are the body of the screen. This is where you 
view printer status, supplies messages, show-me screens, and make selections.
Operator panel (Continued)
Button Function 
						

							2-4Service Manual 4512-630
Diagram of the printer menus
The diagram shows the menu index on the operator panel and the menus and items available under each menu. 
Not all menus or selections will be available in all situations. These are accessed through the driver.
Paper Menu
Paper Source
Paper Size
Paper Type
Custom Types
Universal Setup
Substitute Size
Paper Texture
Paper Weight
Paper Loading
PostScript Menu
Print PS Error
Font Priority
USB Menu
Standard USB Finishing Menu
Duplex
Duplex Bind
Copies
Blank Pages
Collation
Separator Sheets
Separator Source
Multipage Print
Multipage Order
Multipage View
Multipage BorderJob MenuReset Printer Utilities MenuPrint Menus
Print Stats
Print Net Setup
Print Fonts
Print Directory
Factory Defaults
Format Flash
Defragment Flash
Hex Trace
Quality Menu
Print Resolution
Toner Darkness
Small Font Enh. Setup MenuEco-Mode
Quiet Mode
Printer Language
Power Saver
Resource Save
Print Timeout
Wait Timeout
Auto Continue
Jam Recovery
Page Protect
Display Language
To n e r  A l a r m PCL Emul MenuFont Source
Font Name
Point Size
Pitch
Symbol Set
Orientation
Lines per Page
A4 Width
Tray Renumber
Auto CR after LF
Auto LF after CR
Parallel Menu
Std ParallelNetwork MenuStandard Network
PPDS Menu
Orientation
Lines per Page
Lines per Inch
Page Format
Character Set
Best Fit
Tray 1 Renumber
Auto CR after LF
Auto LF after CR