Lexmark S400 Series User manual

Service Manual
Lexmark S400 Series All-In-One
Machine Type 4443-201, 4443-202, 4443-203, 4443-20E

Edition: February 23, 2010
The following paragraph does not apply to any country where such provisions are inconsistent with local law:
LEXMARK INTERNATIONAL, INC. PROVIDES THIS PUBLICATION “AS IS” WITHOUT WARRANTY OF ANY KIND,
EITHER EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Some states do not allow disclaimer of express or
implied warranties in certain transactions; therefore, this statement may not apply to you.
This publication could include technical inaccuracies or typographical errors. Changes are periodically made to the
information herein; these changes will be incorporated in later editions. Improvements or changes in the products or the
programs described may be made at any time.
Comments may be addressed to Lexmark International, Inc., Department D22X/002-1, 740 West New Circle Road,
Lexington, Kentucky 40550, U.S.A or e-mail at [email protected]. Lexmark may use or distribute any
of the information you supply in any way it believes appropriate without incurring any obligation to you.
References in this publication to products, programs, or services do not imply that the manufacturer intends to make these
available in all countries in which it operates. Any reference to a product, program, or service is not intended to state or
imply that only that product, program, or service may be used. Any functionally equivalent product, program, or service that
does not infringe any existing intellectual property right may be used instead. Evaluation and verification of operation in
conjunction with other products, programs, or services, except those expressly designated by the manufacturer, are the
user’s responsibility.
Lexmark and Lexmark with diamond design are trademarks of Lexmark International, Inc., registered in the United States
and/or other countries.
All other trademarks are the property of their respective owners.
© 2009 Lexmark International, Inc.
All rights reserved.
UNITED STATES GOVERNMENT RIGHTS
This software and any accompanying documentation provided under this agreement are commercial computer software
and documentation developed exclusively at private expense.
P/N 12G0162 Rev 001
Lexmark S400 Series

Table of contents iii
Lexmark S400 Series
Table of contents
Table of contents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .iii
Safety information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v
Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .viii
General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Print specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Scanner specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Copy specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Fax specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Media specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Understanding the operator panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
Using the operator panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
Maintenance approach . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11
Tools required for service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11
Acronyms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11
Diagnostic information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Power-On Self Test (POST) sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Troubleshooting tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Error Code Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Service checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
System board service checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
CIS module assembly service checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
Carrier service checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12
Diagnostic aids . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Test mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Test page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Uninstall/reinstall instructions for Windows users . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
For Windows 2000, Windows XP, and Vista . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Uninstall/reinstall instructions for Mac users . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Repair information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Handling ESD-sensitive parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Removal procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Releasing plastic latches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
General precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
ADF/scanner assembly removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
Wick removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9
Midframe removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11
INA card removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-13
Operator panel insert removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-15
Operator panel overlay removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-16
Logo plate removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-17
Operator panel removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-18
Print engine removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-19
Paper feed assembly removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-23
RFID card removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-27
System board removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-28
Carrier assembly removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-31
Encoder dial sensor removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-36
Fax card removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-37
Media sensor removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-40

Table of contents iv
Lexmark S400 Series
Printer base removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-42
Locations and connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
Front view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
Rear view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
System board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
System board connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
INA card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5
INA card connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5
RFID card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6
RFID card connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6
Preventive maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
Lubrication specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
Parts catalog . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
How to use this parts catalog . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
Assembly 1: Covers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2
Assembly 2: Electronics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-4
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-1

Safety information v
Lexmark S400 Series
Safety information
•The safety of this product is based on testing and approvals of the original design and specific
components. The manufacturer is not responsible for safety in the event of use of unauthorized
replacement parts.
•The maintenance information for this product has been prepared for use by a professional service person
and is not intended to be used by others.
•There may be an increased risk of electric shock and personal injury during disassembly and servicing of
this product. Professional service personnel should understand this and take necessary precautions.
Consignes de sécurité
•La sécurité de ce produit repose sur des tests et des
agréations portant sur sa conception d'origine et sur des composants particuliers. Le fabricant n'assume
aucune responsabilité concernant la sécurité en cas d'utilisation de pièces de rechange non agréées.
•Les consignes d'entretien et de réparation de ce produit s'adressent uniquement à un personnel de
maintenance qualifié.
•Le démontage et l'entretien de ce produit pouvant présenter certains risques électriques, le personnel
d'entretien qualifié devra prendre toutes les précautions nécessaires.
Norme di sicurezza
•La sicurezza del prodotto si basa sui test e sull'approvazione del progetto originale e dei componenti
specifici. Il produttore non è responsabile per la sicurezza in caso di sostituzione non autorizzata delle
parti.
•Le informazioni riguardanti la manutenzione di questo prodotto sono indirizzate soltanto al personale di
assistenza autorizzato.
•Durante lo smontaggio e la manutenzione di questo prodotto,
il rischio di subire scosse elettriche e danni alla persona è più elevato. Il personale di assistenza
autorizzato deve, quindi, adottare le precauzioni necessarie.
Sicherheitshinweise
•Die Sicherheit dieses Produkts basiert auf Tests und Zulassungen des ursprünglichen Modells und
bestimmter Bauteile. Bei Verwendung nicht genehmigter Ersatzteile wird vom Hersteller keine
Verantwortung oder Haftung für die Sicherheit übernommen.
•Die Wartungsinformationen für dieses Produkt sind ausschließlich für die Verwendung durch einen
Wartungsfachmann bestimmt.
•Während des Auseinandernehmens und der Wartung des Geräts besteht ein zusätzliches Risiko eines
elektrischen Schlags und körperlicher Verletzung. Das zuständige Fachpersonal sollte entsprechende
Vorsichtsmaßnahmen treffen.
CAUTION: POTENTIAL INJURY
This device contains a lithium battery. There is a danger of explosion if a lithium battery is
incorrectly replaced. Replace it only with the same or equivalent type of lithium battery.
Discard used batteries according to the manufacturer’s intstructions and local regulations.

vi Service Manual
Lexmark S400 Series
Pautas de Seguridad
•La seguridad de este producto se basa en pruebas y aprobaciones del diseño original y componentes
específicos. El fabricante no es responsable de la seguridad en caso de uso de piezas de repuesto no
autorizadas.
•La información sobre el mantenimiento de este producto está dirigida exclusivamente al personal
cualificado de mantenimiento.
•Existe mayor riesgo de descarga eléctrica y de daños personales durante el desmontaje y la reparación de
la máquina. El personal cualificado debe ser consciente de este peligro y tomar las precauciones
necesarias.
Informações de Segurança
•A segurança deste produto baseia-se em testes e aprovações do modelo original e de componentes
específicos. O fabricante não é responsável pela segunrança, no caso de uso de peças de substituição
não autorizadas.
•As informações de segurança relativas a este produto destinam-se a profissionais destes serviços e não
devem ser utilizadas por outras pessoas.
•Risco de choques eléctricos e ferimentos graves durante a desmontagem e manutenção deste produto.
Os profissionais destes serviços devem estar avisados deste facto e tomar os cuidados necessários.
Informació de Seguretat
•La seguretat d'aquest producte es basa en l'avaluació i aprovació del disseny original i els components
específics.
El fabricant no es fa responsable de les qüestions de
seguretat si s'utilitzen 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 desmuntatge i de servei
d’aquest producte. El personal professional ha d’estar-ne assabentat i prendre
les mesures convenients.

Safety information vii
Lexmark S400 Series

viii Service Manual
Lexmark S400 Series
Preface
This manual contains maintenance procedures for service providers. It is divided into the following chapters:
1. General information contains a general description of the printer and the maintenance approach used to repair
it. It includes printer specifications, special tools, and acronyms.
2. Diagnostic information contains an error code table, symptom tables, and service checks used to isolate
failing field replaceable units (FRUs).
3. Diagnostic aids contains tests and checks used to locate or repeat symptoms of printer problems.
4. Repair information provides instructions for making printer adjustments and removing and installing FRUs.
5. Connector locations uses illustrations to identify the connector locations and test points on the printer.
6. Preventive maintenance contains the lubrication specifications and recommendations to prevent problems.
7. Parts catalog contains illustrations and part numbers for individual FRUs.

General information 1-1
Lexmark S400 Series
1. General information
The Lexmark™ S400 Series All-In-One (4443-201, 4443-202, 4443-203, 4443-20E) is a letter-quality print, copy, scan,
and fax machine. It is a standalone color/mono copier.

1-2 Service Manual
Lexmark S400 Series
Print specifications
Print speed Quick print: 33 ppm mono/30 ppm color
Print functions/features Standalone photo printing:
• Color or black (grayscale) photo printing
• Photo Menu options pop up at card insert
• Print all photos
• Save photos to PC
• Print photos from USB drive
• Print proof sheet
• Print from PictBridge camera
• Red-eye reduction via proof sheet
• Photo effects: Auto Image Enhance, Antiquing (gray or brown), Sepia,
black and white
Card reader support • Multi Media Card (MMC)
• Secure Digital (SD)
• Mini SD (with customer supplied adapter)
• Memory Stick (MS)
• Memory stick pro
• Memory stick duo (with customer supplied adapter)
• Memory stick duo pro (with customer supplied adapter)
•XD
• XD type M and H
• Micro SD (Transflash) (with customer supplied adapter)
• MMC mobile (with customer supplied adapter)
• RS-MMC (with customer supplied adapter)
• SDHC (high capacity)

General information 1-3
Lexmark S400 Series
Scanner specifications
Scanner type Flatbed CIS
Scan modes True Color:
• 48 bits internal
• 24 bits external
Gray Mode:
• 16 bits internal
• 8 bits external
Text/Line Art:
1 bit per pixel
Scan method One pass Smart Copy
Lamp warm-up time None
Flatbed scan area • 8.5 X 11.7 inches
• 216 X 297 mm
ADF scan area Maximum:
• 8.5 X 14 inches (w x l)
• 216 X 356 mm
Minimum:
• 8.27 X 11 inches (w x l)
• 210 X 279 mm
Scan resolution • Horizontal: 1200 ppi
• Vertical: 2400 ppi
Optical scan resolution 1200 x 2400 ppi

1-4 Service Manual
Lexmark S400 Series
Copy specifications
Copy function Standalone only
Standalone copy speed Quick copy:
First copy: 8 ppm mono target, 3 ppm color
Additional copies: 25 ppm mono, 21 ppm color
Standalone copy specifications Mono copy:
• Quick: 300 X 600 dpi print, 150 X 150 ppi scan
• Normal: 600 X 600 dpi print, 300 X 300 ppi scan
• Photo: 1200 X 1200 dpi print, 300 X 300 ppi scan
Color copy:
• Quick: 300 X 600 dpi print, 150 X 150 ppi scan
• Normal: 600 X 600 dpi print, 300 X 300 ppi scan
• Photo (plain): 1200 X 1200 dpi print, 300 X 300 ppi scan
• Photo (glossy): 1200 x 1200 dpi print, 600 x 600 ppi scan
Standalone copy features • One touch copy (defaults to color)
• Borderless copying (all supported borderless paper sizes are selected via
printer driver. Standalone borderless supports all sizes listed under media
type excluding Legal, 3.5 x 5, and 3 x 5.)
• Repeat image
•N-up
• Collate
Supported media type (selectable
via operator panel) • Plain
• Matte photo paper
• Transparency
• Glossy/photo

General information 1-5
Lexmark S400 Series
Fax specifications
Fax type Standalone mono and color
Paper size Sends and receives legal, letter, and A4
Fax resolution Mono and color support initiated via operator panel:
• Standard: 200 X 100 ppi
• Fine: 200 X 200 ppi
• SuperFine: 300 X 300 ppi
• Ultra fine: 400 X 400 ppi
Fax features • Telephone answering device hookup
• Speaker (no microphone)
• 89 Speed dials
• 10 Group dials
• 30 fax numbers per group supported
• 64 digit fax number support
• Caller ID (where supported)
• Automatic redial/busy redial
• Call waiting disable support
• Fax/Tel mode with distinctive ring detection
• Confirmation, error, and activity reports
• Up to 160 pages using standard resolution
• Pulse/tone mode
• Delay send
• Broadcast send
• Fax forwarding
• Fax forwarding and print
• Junk fax block (where available)
• Auto answering
• Print to fax function
• Parallel handset detection support
• Parallel handset manual pickup support
• Digital lane detect notify
• Group fax
• VOIP compatible fax

1-6 Service Manual
Lexmark S400 Series
Media specifications
Paper capacities Input tray
Plain Up to 100 sheets
Envelopes Up to 10 envelopes
Banner Up to 20 sheets
Heavyweight matte Up to 25 sheets
Photo/glossy Up to 25 sheets
Transparencies Up to 50 sheets
Iron-on transfer Up to 10 sheets
Card stock Up to 25 sheets
Labels Up to 25 sheets
Exit tray
Paper Up to 25 sheets
Transparencies 1 sheet
Photo/glossy 1 sheet
Labels Up to 20 sheets
Envelopes Up to 10 envelopes
Heavyweight matte Up to 25 sheets
Banner Up to 20 sheets
Iron-on transfer Up to 10 sheets
Card stock Up to 15 sheets
Media sizes (via driver) Automatic sheet feed:
• Letter (8 1/2 x 11 in.)
• Legal (8 1/2 x 14 in.)
• Executive (7 1/4 x 10 1/2)
• Index card (3 x 5 in.)
• 4 x 6 in.
• 10 x 15 cm
• 4 x 8 in.
• 10 x 20 cm
• A4 (210 x 297 mm)
• B5 (182 x 257 mm)
• A5 (148 x 210 mm)
• A6 card (105 x 148 mm)
• Hagaki (100 x 148 mm)
• L (89 x 127 mm)
• 2L (127 x 178 mm)
• 3.5 x 5 in.

General information 1-7
Lexmark S400 Series
Media sizes (via driver) continued Automatic sheet feed (continued):
• 5 x 7 in.
• 13 x 18 cm
• Custom size (width 3-8.5 in./height 5.0-17.0 in.)
Envelopes:
• 6 3/4 (3 5/8 x 6 1/2 in.)
• 7 3/4 (3 22/25 x 7 1/2 in.)
• 9 (3 7/8 x 8 7/8 in.)
• 10 (4 1/8 x 9 1/2 in.)
• DL (110 x 220 mm)
• C5 (162 x 229 mm)
• C6 (114 x 162 mm)
• B5 (176 x 250 mm)
• A2 baronial (111 x 146 mm)
• Custom size

1-8 Service Manual
Lexmark S400 Series
Understanding the operator panel
Using the operator panel
The operator panel buttons allow you to copy, scan, fax, or print documents and photos.
The operator panel features:
•2 line text LCD
•7 LEDs (6 green, 1 white)
•1 card reader LED (green)
•2 wireless medallion LEDs (green and amber)
•28 buttons
Number Part Button Function
1 Power on/off button • Turns the printer on and off
• Switches to Power Saver mode
Note: When the printer is on, press the Power button to
switch to Power Saver mode. Press and hold the Power
button for three seconds to turn off the printer.
2 Copy button Accesses the copy menu and makes copies
3 Scan button Accesses the scan menu and scans documents
4 Fax button Accesses the fax menu and sends faxes
Cancel
1
5
11
2346789
10
12
13
14
14 15
16
17

General information 1-9
Lexmark S400 Series
5 Photo button Accesses the photo menu and prints photos
6 Address Book button Accesses fax numbers from a saved list of numbers
7 Redial/Pause button In fax mode:
• Inserts a three-second pause in a fax number to wait for
an outside line or to get through an automated
answering system. Enter a pause only when the
number has already begun being entered.
• Displays the last number dialed. Press the left or right
arrow buttons to view the last five numbers dialed.
8 Dialtone button Dials the telephone number manually using the keypad
before sending the fax.
9 Color/Black button Switches to color mode or to black-and-white mode
10 Start button Starts a print, scan, or copy job, depending on which mode
is selected.
11 Cancel button • Cancels a print, copy, or scan job in progress
• Exits from a menu level of the Copy, Scan, Photo, or
File Print menus to the top level of a menu
• Exits from a menu level of the Setup menu to the top
level of the previous mode
• Clears current settings or error messages, and returns
to default settings
12 Keypad • Enters the number of copies or prints to be made when
in Copy mode of Photo mode
• Enters the fax numbers, navigates an automated
answering system, selects letters when creating a
speed dial list, and types numbers to enter or edit the
date and time shown on the display when in Fax mode
13 Display Displays printer status, messages, and menus
Note: The display is turned off in Power Saver mode.
14 Arrow buttons Selects a menu or submenu item that appears on the
display
Number Part Button Function

1-10 Service Manual
Lexmark S400 Series
15 Select button • Selects menu options
• Saves settings
• Feeds or ejects paper (Press and hold for three
seconds to feed or eject paper from the printer.)
16 Back button • Returns to the previous screen
• Exits from one menu level to a higher one
17 Setup button Accesses the setup menu and changes the printer settings
Note: The Copy, Scan, and Photo button lights are off
when this button is selected.
Number Part Button Function

General information 1-11
Lexmark S400 Series
Maintenance approach
The diagnostic information in this manual leads you to the correct field replaceable unit (FRU) or part. Use the error
codes, symptom tables, service checks, and diagnostic aids to determine the symptom and repair the failure.
After you complete the repair, perform tests as needed to verify the repair.
Tools required for service
•Flat-blade screwdriver
•#1 Phillips screwdriver
•#2 Phillips screwdriver
•Spring hook
•Analog or digital multimeter
Acronyms
ADC Analog to Digital Converter
ASF Automatic Sheet Feeder
ASIC Application Specific Integrated Circuit
DMA Direct Memory Access
dpi Dots per inch
DSA NPA Device Status Alert
EEPROM Electrically Erasable Programmable ROM
EOF End of Form
Flash Fast EEPROM
GPIO General Purpose Input/Output
HBP Hose Based Printing
IEEE Institute of Electrical and Electronics Engineers
ips inches per second
LED Light-Emitting Diode
NPA Network Printing Alliance
NVRAM Nonvolatile Random Access Memory
OEM Original Equipment Manufacturer
POR Power-On Reset
POST Power-On Self Test
ppi Pixles per inch
RAM Random Access Memory
ROM Read Only Memory
TSR Temperature Sense Resistor
PWM Pulse Width Modulate
UART Universal Asynchronous Receiver/Transmitter
USB Universal Serial Bus

1-12 Service Manual
Lexmark S400 Series