Lexmark C792-X792 Color Product Study Guidecontentdelivery.lexmark.com/webcontent/training/CX792/C792_X792... · Lexmark C792/X792 Color Product Study Guide Rev 2.2 For Training Purposes

Lexmark C792/X792

Color Product Study Guide

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Lexmark C792/X792 Color Product Study Guide Rev 2.2

For Training Purposes Only 12/6/2011

Edition: December 2011 Revision: 2.2 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., Services Training/008-2, 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, Lexmark with diamond design, and MarkNet are trademarks of Lexmark International, Inc., registered in the United States and/or other countries. PCL® is a registered trademark of the Hewlett-Packard Company. All other trademarks are the property of their respective owners. © 2011 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.






Table of Contents

CONFIG IDS, TLI, TYPE AND SERIAL NUMBER LOCATION ..................................... 1

C792 TECHNICAL INFORMATION ................................................................................ 2

SPECIFICATIONS ....................................................................................................................................... 2 DUTY CYCLE ............................................................................................................................................ 3 PRINT SPEED ............................................................................................................................................ 3 MEDIA OPTIONS ........................................................................................................................................ 4 MAXIMUM PAPER HANDLING AND FURNITURE CONFIGURATIONS ................................................................ 5 SUPPLY ITEMS .......................................................................................................................................... 6

C792 Toner Cartridges..................................................................................................................... 6 C792 Maintenance Items ................................................................................................................. 6

X792 MFP TECHNICAL INFORMATION ....................................................................... 7

SPECIFICATIONS ....................................................................................................................................... 7 DUTY CYCLE ............................................................................................................................................ 8 FAX FEATURES ......................................................................................................................................... 8 SCANNER SPECIFICATIONS ..................................................................................................................... 10 MFP SCAN SPEED .................................................................................................................................. 10 MEDIA OPTIONS ...................................................................................................................................... 11 MAXIMUM PAPER HANDLING AND FURNITURE CONFIGURATIONS .............................................................. 12 SUPPLY ITEMS ........................................................................................................................................ 13

X792 Toner Cartridges ................................................................................................................... 13 X792 Maintenance Items ............................................................................................................... 13

THEORY OF OPERATION ........................................................................................... 14

ELECTROPHOTOGRAPHIC PROCESS ........................................................................................................ 14 C792 and X792 EP Process Key Components ............................................................................. 15

PAPER TRANSPORT SYSTEM ................................................................................................................... 16 C792 and X792 Print Engine Key Hardware Components ............................................................ 16 C792 and X792 Print Engine Key Sensor Components ................................................................ 17 C792 and X792 Print Engine Paper Path ...................................................................................... 18 X792 Scanner Key Components .................................................................................................... 19 X792 Scanner Paper Path ............................................................................................................. 20 C792 and X792 Paper Jam Locations ........................................................................................... 21



OPERATOR PANEL AND MENUS .............................................................................. 22

C792 OPERATOR PANEL ........................................................................................................................ 22 C792 Home Screen ........................................................................................................................ 23 C792 Administrative (Customer) Menu .......................................................................................... 24 C792 Service Menus ...................................................................................................................... 25

X792 OPERATOR PANEL......................................................................................................................... 27 X792 Home Screen ........................................................................................................................ 28 X792 Home Screen Buttons .......................................................................................................... 29 X792 Administrative (Customer) Menu .......................................................................................... 30 X792 Service Menus ...................................................................................................................... 31

PRINT QUALITY DIAGNOSTIC TIPS .......................................................................... 33

GENERAL TERMINOLOGY ........................................................................................................................ 33 PRINT QUALITY RULES OF THUMB ........................................................................................................... 34

PAPER TRANSPORT DIAGNOSTIC TIPS .................................................................. 35

PAPER RULES OF THUMB ........................................................................................................................ 35 IMAGE ORIENTATION IN THE TRAY ........................................................................................................... 36

Simplex Orientation ........................................................................................................................ 36 Duplex Orientation ......................................................................................................................... 36

FAX PRINT QUALITY DIAGNOSTIC TIPS .................................................................. 37

Sending Fax Machine at Fault ....................................................................................................... 38 Receiving Fax Machine at Fault ..................................................................................................... 39 Phone Line at Fault ........................................................................................................................ 39

COMPLEX PARTS AND PROCEDURES .................................................................... 40

PRINTHEAD REPLACEMENT ..................................................................................................... 41

FLATBED SCANNER ASSEMBLY ......................................................................................... 42

ADF UNIT ASSEMBLY ............................................................................................................ 42

FLATBED SCANNER CCD ASSEMBLY ...................................................................................... 42

ADF DUPLEX CCD ASSEMBLY ............................................................................................... 42

SYSTEM BOARD ..................................................................................................................... 42

EP DRIVE/EXIT COOLING DUCT .............................................................................................. 46

STAGING PAPER PATH REFERENCE EDGE .................................................................................... 46 MIRRORED NVRAM COMPONENTS ......................................................................................................... 47



UICC Card – C792 Only .......................................................................................................... 47

Scanner Interface Card – X792 Only ....................................................................................... 47

Flatbed Scanner Assembly – X792 Only ................................................................ 47

System Board – C792 and X792 .................................................................................. 47

OTHER SPECIAL INSTRUCTIONS ............................................................................. 48

CLEANING THE MFP DOCUMENT GLASS – X792 ONLY ............................................................................ 48 SECURITY RESET JUMPER ...................................................................................................................... 49 RECOVERY MODE ................................................................................................................................... 51 PRINT ENGINE SKEW GUIDELINES ........................................................................................................... 51

Print Engine Skew Adjustment ....................................................................................................... 61 SCANNER SKEW ..................................................................................................................................... 63

Scanner Skew Adjustment ............................................................................................................. 65





For Training Purposes Only 12/6/2011 1

Config IDs, TLI, Type and Serial Number Location To find the Config IDs, TLI, printer Type and Serial number, open the front cover and look inside the machine on the left hand side.



C792 Technical Information

Specifications C792e C792de C792dte C792dhe

Processor

Speed and Type 1.2 GHZ Power PC Processor

Memory

Standard 512 MB (Max 1.5 GB) 1GB (Max 1.5GB)

Optional Memory 256MB, 512MB and 1 GB DDR2 SODIMM

Optional Flash Memory 256 MB

Hard Drive Optional 160GB or Higher 160GB or higher

Connections

Standard Gigabit Ethernet & USB

Option Slots

DRAM DIMM Slots 1

Wireless Option Yes

ISP (INA) Slots 1

DLE Firmware Card, Font Card and Flash Memory Card Slots

21

Paper Handling

Paper Input Standard 100 + 550 Sheet Drawer (total 650) 100 + 550 + 550 Sheet Drawer (total 1200)

100 + 550 + 550 + 550 + 550 Sheet

Drawer (total 2300)

Optional Paper Handling: Input

550 Sheet Drawer 2000 Sheet Feeder Banner Media Tray

550 Sheet Drawer Banner Media Tray

Optional Paper Handling: Output

1000 Sheet Stacker 5-Bin Mailbox

Finisher Finisher w/Hole Punch

Duplex None Internal Duplex

Finishing Standard None

Hard Drive Standard Optional 160GB Hard drive

Service

Warranty One year On-site Parts and Labor

Furniture

Furniture Standard None Caster Base

Optional Furniture Spacer, Caster Base Spacer

1 Supported combination if both slots used: DLE + user flash, DLE + Font, Font + User Flash.



Duty Cycle

Usage (Pages)

Model Average Monthly 1 Duty Cycle 2

C792 2500-17,000 150,000 1 Average Monthly Page Volume is an average range of pages customers plan to print on the device each month. Lexmark recommends that the number of pages per month be within the stated range for optimum device performance, based on factors including: supplies replacement intervals, paper loading intervals, speed, and typical customer usage. ² Duty Cycle is defined as the maximum monthly usage verified using multi-shift operation. The usage rate can be limited by application and run mode.

Print Speed

Media Size X79x

Mono Color Letter (plain) 50ppm 50ppm A4 (plain) 47.5ppm 47.5ppm

Note: Throughput is measured using default printer settings.



Media Options

Lexmark C792 Options

550-Sheet Drawer

2000-Sheet High Capacity Feeder

Spacer Drawer

Banner Media Tray [No Picture Available]

500-Sheet Staple Finisher (includes Stapler and Transport Unit)

500-Sheet Staple, Hole Punch Finisher (includes Stapler, Hole Punch and Transport Unit)

5-Bin Mailbox (no Stapler, no Hole Punch has Transport Unit)

500-Sheet Offset Stacker (no Stapler, no Hole Punch has Transport Unit)

Caster Base



Maximum Paper Handling and Furniture Configurations The authoritative tables of maximum Printer Paper Options/Furniture combinations are publicly available at www.lexmark.com/multifunctionprinters. Please refer to this information when purchasing additional paper input options for any of the C790 Series printers.

Placed on: Caster Base

2000-sheet High Capacity Feeder

Optional 550-sheet drawers or Spacers

Output Option

1 1 2 3 4 1

Desktop* NA

Floor Required

Floor

May be used, but not required for safe operation**

*Maximum recommended height for optimal usability is 53" (1.3 m)

**One optional spacer (47B0114) at bottom of stack is recommended for optimal usability.

Note: A Banner Tray may be added to any configuration that also includes an optional 550-sheet drawer. The banner tray may not be used in a configuration that also includes output options.

http://www.lexmark.com/multifunction�



Supply Items C792 Toner Cartridges

Toner Cartridges Approximate Yield

Ships with printer

Aftermarket Version

Available

Return Program Version

Available Starter Cartridge Color (C, M, Y) 11K pages Yes No No

Starter Cartridge Black (K) 8.5K pages Yes No No Standard Yield Toner Cartridges Color and Black (C, M, Y, K) Up to 6K pages No Yes Yes

Extra High Yield Toner Cartridges Color and Black (C, M, Y, K) Up to 20K pages No Yes Yes

Note: The average continuous Composite CMY Cartridge yield is standard pages as listed and the average continuous K (black) Cartridge yield is standard pages as listed, in accordance with ISO/IEC 19798. Note: Starter cartridges cannot be swapped between printers for troubleshooting purposes as it will post a 32 Unsupported Cartridge Error message. Note: The Extra High Yield Toner cartridges for the C792 printer will work in both the C792 and the X792.

C792 Maintenance Items

Approximate Yield Customer Installable

Fuser Up to 150,000 Pages1 Yes

ITU Up to 200,000 Pages1 Yes

Tray Pick Tires Up to 750,000 Pages No

MPF Pick Ties and Wear Strip Up to 15,000 Pages No 1 Yield based on an average of 3 pages per job and approximately 5% coverage per color. Because these modules are affected by environment, duty cycle and toner coverage, actual page count may vary.



X792 MFP Technical Information

Specifications X792de X792dte X792dtfe X792dtpe X792dtme X792dtse

Processor

Speed and Type 1.2 GHZ Power PC Processor

Memory

Standard 1GB RAM (Max 2 GB)

Optional Memory 256MB, 512MB and 1 GB DDR2 SODIMM

Optional Flash Memory 256 MB

Hard Drive Standard 160GB or higher

Connections

Standard Gigabit Ethernet & USB

Option Slots

DRAM DIMM Slots 1

Wireless Option Yes

ISP (INA) Slots 1

DLE Firmware Card, Font Card and Flash Memory Card Slots

21

Paper Handling

Paper Input Standard 100 + 550

Sheet Drawer (total 650)

100 + 550 + 550 + 550 Sheet Drawer (total 1750)

Paper Output Standard 500 - Sheet Output Bin 500 - Sheet Output Bin + Finisher 500-Sheet (Total 1000)

500 - Sheet Output Bin + 5

100-Sheet mailbox bins (Total 1000)

500 - Sheet Output Bin + 500-Sheet

Stacker (Total 1000)

Optional Paper Handling: Input

2000 Sheet Feeder

Banner Media Tray

Banner Media Tray 550-Sheet Drawer

Duplex Internal Duplex

Finishing Standard None 500-Sheet

Staple Finisher

500-Sheet Staple, Hole

Punch Finisher

5-bin Mailbox 500-Sheet

Offset Stacker

Service

Warranty One year On-site Parts and Labor

Furniture

Furniture Standard None Caster Base and Roll-off Pkg

1 Supported combination if both slots used: DLE + user flash, DLE + Font, Font + User Flash.



Duty Cycle

Usage (Pages)

Model Average Monthly 1 Duty Cycle 2

X792 2500-17,000 150,000 1 Average Monthly Page Volume is an average range of pages customers plan to print on the device each month. Lexmark recommends that the number of pages per month be within the stated range for optimum device performance, based on factors including: supplies replacement intervals, paper loading intervals, speed, and typical customer usage. ² Duty Cycle is defined as the maximum monthly usage verified using multi-shift operation. The usage rate can be limited by application and run mode.

Fax Features

Feature Notes Fax Preservation Faxes are preserved over power cycle Color Fax Enable Color Scans

Auto Convert Color to Mono Fax Enable Color Fax Receive – When On the sending device transmits in color and receiving

device prints in grayscale – When Off the sending device converts and transmits the job

as a mono job Fax Content Type: Text, Graphics, Text/Photo, Photo

Source: Color Laser, Black/White Laser, Inkjet, Photo/Film, Magazine, Newspaper, Press, Other

Original Size All sizes supported by device including: Mixed – Letter/Legal

Dial Mode Touch Tone Pulse

Custom Job scanning Only appears if hard drive installed Scan Preview Only appears if hard drive installed Fax Cover Page Includes: To, From, Message, Footers, Logo and Total Pages Fax Number Masking Active masking Maximum Speed Settings for both Send and Receive Delayed Send Block Junk Fax Banned Fax List Based on Caller ID or Remote Station ID Fax Shortcuts Average shortcut includes: 25 characters for Name, 10

characters for number and 4 characters for Shortcut Id. Shortcuts can contain one phone number or multiple numbers. Each number is a location; see Performance area for maximum locations.

Broadcast Fax Maximum locations is 400 Fax Forwarding Incoming Faxes may be forwarded to:

Fax – using one Fax Shortcut Email – using one Email Shortcut FTP – using one FTP shortcut LDSS eSF – supported via custom application Any fax resolution that can be received can also be forwarded



Caller ID If subscribed to Caller ID from phone provider Manual Fax Disabled by default Fax from PC Supported using Postscript driver Fax Print Holding Only appears if hard drive installed Fax Logs Transmission Log

Receive Error Log Fax Call Log Fax Job Log

Distinctive Ring selection If subscribed/configured from phone provider Sound Control Ringer Volume

Speaker Volume Speaker Mode – On, On Until Connected, Off

Fax Server Fax Server mode will send the scanned fax job to the fax server via email, where it will be sent to the receiver. The device should be tested for configurability and compatibility with the desired third fax server products such as: Biscom, Equisys-ZetaFax, OMTool, Captaris – RightFax, or Tobit- Faxware.



Scanner Specifications Scanner Scanner Type Color Flatbed Scanner with ADF

Scan Technology Charge Coupled Device (CCD)

Light Source LED

Number of Light Sources 1 lamp per CCD Module

Scanner ADF

ADF Type Single Pass, Duplex Scan, C-Path Jobs with Mixed length pages accepted up to Legal (width must be the same)

Scanner ADF Document Input & Output Capacity 75 Sheets, 20 lb. (75 g/m2) Bond

Scanner Media Depth (Thickness) Max. .15mm Min. .05mm

Scanner Media Weight Max. 32lb (120g/m2) Min. 14lb (52g/m2)

Document Size Max. 8.5” x 14.0” (216mm x 355mm) Short Edge Feed (SEF) Min. 3.0” x 5.5” (114.3mm x 139.7mm) Short Edge Feed (SEF)

Document Size Sensing Yes – length and width in ADF

Document Sensing Yes – ADF paper present LED and on/off settable beep

Scanner Flatbed

Max Document Size 8.5” x 14.0” (216mm x 355mm)

Document Size Sensing Yes– paper length sensing only on flatbed

Print Engine

Print Technology Color Laser

Duplex output Standard

Paper Feed Orientation Short Edge and Long Edge Fed

Fax

Modem V.34, Group 3 compatible 33.6kb/s Fax Modem

MFP Scan Speed

Media Size Simplex Duplex Mono Color Mono Color

Letter (plain) 50 50 29 27 A4 (plain) 47 47 28 26

Note: Scan Performance is measured as 150dpi 1-bit for mono and 150dpi 24-bit for color.



Media Options

Lexmark X792 Options

550-Sheet Drawer

2000-Sheet High Capacity Feeder

Spacer Drawer

Banner Media Tray [No Picture Available]

500-Sheet Staple Finisher (includes Stapler and Transport Unit)

500-Sheet Staple, Hole Punch Finisher (includes Stapler, Hole Punch and Transport Unit)

5-Bin Mailbox (no Stapler, no Hole Punch has Transport Unit)

500-Sheet Offset Stacker (no Stapler, no Hole Punch has Transport Unit)

Caster Base



Maximum Paper Handling and Furniture Configurations The authoritative tables of maximum Printer Paper Options/Furniture combinations are publicly available at www.lexmark.com/multifunctionprinters. Please refer to this information when purchasing additional paper input options for any of the C790 Series printers.

Placed on: Caster Base

2000-sheet High Capacity Feeder

Optional 550-sheet drawers or Spacers

Output Option

1 1 2 3 4 1

Desktop* NA

Floor Required

Required

Required

Floor

May be used, but not required for safe operation**

Required

*Maximum recommended height for optimal usability is 53" (1.3 m)

**One optional spacer (47B0112 at bottom of stack is recommended for optimal usability.

Note: A Banner Tray may be added to any configuration that also includes an optional 550-sheet drawer. The banner tray may not be used in a configuration that also includes output options.

http://www.lexmark.com/multifunction�



Supply Items X792 Toner Cartridges

Toner Cartridges Approximate Yield

Ships with printer

Aftermarket Version

Available

Return Program Version

Available Starter Cartridge Color (C, M, Y) 12K pages Yes No No

Starter Cartridge Black (K) 12K pages Yes No No Standard Yield Toner Cartridges Color and Black (C, M, Y, K) Up to 6K pages No Yes Yes

Extra High Yield Toner Cartridges Color and Black (C, M, Y, K) Up to 20K pages No Yes Yes

Note: The average continuous Composite CMY Cartridge yield is standard pages as listed and the average continuous K (black) Cartridge yield is standard pages as listed, in accordance with ISO/IEC 19798. Note: Starter cartridges cannot be swapped between printers for troubleshooting purposes as it will post a 32 Unsupported Cartridge Error message. Note: The Extra High Yield Toner cartridges for the X792 printer are NOT supported in the C792 printer.

X792 Maintenance Items

Approximate Yield Customer Installable

Fuser Up to 150,000 Pages1 Yes

ITU Up to 200,000 Pages1 Yes

Tray Pick Tires Up to 750,000 Pages No

MPF Pick Ties and Wear Strip Up to 15,000 Pages No

ADF Maintenance Kit – includes the: • ADF Feed/Pick Roll Assembly • ADF Separator Roll and Guide

120,000 Pages No

1 Yield based on an average of 3 pages per job and approximately 5% coverage per color. Because these modules are affected by environment, duty cycle and toner coverage, actual page count may vary.



Theory of Operation

Electrophotographic Process This color laser printer uses the Electrophotographic process (EP Process) to image toner onto the media via a tandem (in-line) system. This system contains four color cartridge assemblies (cyan, yellow, magenta, and black). The Electrophotographic Process steps are as follows:

• Charge – the Photoconductor Drum surface is evenly charged with electricity from the Charge Roll (located inside the toner cartridge assembly) by the HVPS board,

• Expose – the Printhead (laser) exposes the photoconductor with light and creates a Latent Image on the surface by partially discharging the area exposed. In this printer, One printhead generates four separate beams to expose the four color stations,

• Develop – toner from the Developer Roll (located in the toner cartridge assembly) adheres to the latent image on the surface of the photoconductor. This happens because of a difference in charge potential between the two surfaces,

• 1st Transfer – an electrical charge is sent to each of the four 1st Transfer Rolls inside the ITU (Transfer Belt). Due to the difference in charge potential, toner is transferred from the Photoconductor Drum to the surface of the ITU as it passes each color station,

• 2nd Transfer – media is picked from the tray and passes between the 2nd Transfer Roller and ITU surface. A positive charge is sent to the 2nd Transfer roller and toner jumps to the media due to the charge difference,

• Fuse – the media is carried to the fuser where the toner it is bonded permanently to the page by heat and pressure,

• Clean/Erase – a cleaning blade for each Photoconductor Drum and one for the ITU clean residual toner from the surfaces of those components. Waste toner is deposited into the Waste Toner Assembly. This printer does not have erase lamps.

If a component fails, it is important to recognize at which step the failure took place. By knowing this, you can determine the source of the problem. Understanding the EP Process is the key to troubleshooting print quality problems. The page illustrates the EP Components in a cross-sectional of a C792x printer. The X792 printer has the same EP components as the C792 printer.



C792 and X792 EP Process Key Components

ITU 1st Transfer Rolls

2nd Transfer Roll

Fuser

Toner Cartridges Printhead (laser)

Photoconductors



Paper Transport System C792 and X792 Print Engine Key Hardware Components

Tray 1 Pick Roller

Paper Pick Mechanism

(The arm is in the UP position)

Multipurpose Feeder Pick

Roller

ITU

2nd Transfer Roll

Fuser

Fuser Exit Rollers

Duplex Roll 1

Duplex Roll 2

Duplex Roll 3

Duplex Roll 4

Output Bin

2nd Feed Rollers

Exit Rollers

1st Feed Rollers



C792 and X792 Print Engine Key Sensor Components

“D2” Duplex Stage Sensor

“D1” Duplex Park Sensor

Fuser Exit Sensor

Redrive Bubble Sensor

Output Bin Sensor

Fuser Bubble Sensor

“S2” Sensor

Narrow Media Sensor / Nearly Narrow Media

Sensor

“S1” Sensor



C792 and X792 Print Engine Paper Path

Simplex Paper Path Duplex Paper Path



X792 Scanner Key Components TBD



X792 Scanner Paper Path TBD




C792 and X792 Paper Jam Locations The C792 and X792 printer share the same paper jam codes and locations except for the Scanner. No scanner is present on the C792 series printers.

Area Jam Numbers What to do

1 200-203

Open side door, and then remove the jammed paper. 230-239

2 24x Open side door of the specified tray, and then remove the jammed paper.

3 250 Remove all paper from the multipurpose feeder, and then remove the jammed paper.

4 280-289 Remove all paper from the ADF, and then remove the jammed paper.

5 401-402

Close the ADF cover. 460-461

6 431-458 Push the button to slide the finisher to the right, open the finisher door, and then remove the jammed

paper.

455 Open staple door, remove the staple cartridge, and then remove the jammed staple.

7 455 Open the staple door, remove the staple cartridge, and then remove the jammed staples.

1

2

3

5

4

6

7



Operator Panel and Menus

C792 Operator Panel

The following page contains a detailed description of the operator panel buttons and their functions.

Number Item Description

1 Display Shows the status of the printer

2 Home Lets you navigate back to the home screen

3 Keypad Allows you to enter numbers, letters, or symbols

4 Sleep

Enables Sleep Mode Note: Touching the screen or any hard button presses can cause the printer to wake from Sleep Mode.

5 Indicator light

• Off – The printer is off. • Blinking green – The printer is warming up, processing data, or printing. • Solid green – The printer is on, but idle. • Solid red – Operator intervention is needed.

6 Stop/Cancel Stops all printer activity Note: A list of options is displayed once Stopped appears on the display.

7 PictBridge and USB port

Allows the user to connect a PictBridge-enabled digital camera, a USB Bluetooth adapter, or a flash drive to the printer Note: Only the front USB port supports flash drives.

2 1 3 4

5 7

6



C792 Home Screen

Display item Description

1 Change Language Allows you to temporarily change the primary language and reports on the display; they will remain in effect unless changed

2 Bookmarks Allows you to create, organize, and save a set of bookmarks (URLs) into a tree view of folders and file links

3 Held Jobs Displays all held jobs

4 USB Displays files on a USB drive

5 Menus Displays the menus

6 Status message bar

• Shows the current printer status such as Ready or Busy

• Note: Make sure Ready appears before performing any printer task.

• Shows printer conditions such as Fuser missing or Cartridge Low

• Shows intervention messages and gives instructions for the printer to continue processing

7 Status/Supplies

• Displays a warning or error message whenever the printer requires intervention to continue processing

• Touch this to access the messages screen for more information on the message, and how to clear it.

8 Tips Opens context-sensitive Help information on the touch screen



C792 Administrative (Customer) Menu For a complete listing of the printer menu tree, consult the User’s Guide. C792 Administrative (Customer) Menu Tree Supplies Paper Menu Reports Settings Cyan Cartridge Default Source Menu Settings Page General Settings Magenta Cartridge Paper Size/Type Device Statistics Flash Drive Menu Yellow Cartridge Configure MP Network Setup Page Print Settings Black Cartridge Substitute Size Network [x] Setup Page Setup Menu Waste Toner Bottle Paper Texture Profiles List Finishing Menu Fuser Paper Weight Print Fonts Quality Menu Transfer Module Paper Loading Print Directory Job Accounting Menu Staples Custom Types Print Demo Utilities Menu Hole Punch Box Custom Names Asset Report XPS Menu Custom Bin Names PDF Menu Universal Setup PostScript Menu Bin Setup PCL Emul Menu HTML Menu Image Menu Security Network/Ports Help Miscellaneous Security Settings Active NIC Print All Guides

Confidential Print Standard Network * Color Quality Disk Wiping Standard USB Print Quality Security Audit Log Parallel [x] Printing Guide Set Date and Time Serial [x] Media Guide SMTP Setup Print Defects Guide Menu Map Information Guide Connection Guide Moving Guide Supplies Guide

* Depending on the printer setup, this menu item appears as Standard Network, Wireless Network, or Network [x].



C792 Service Menus Several hidden menus exist to configure advanced settings, troubleshoot problems or obtain additional printer information. The settings contained in these menus should not be changed unless it is specifically requested by the Service Manual or technical support. Changing the settings may cause improper operation of the printer. For a complete list of these menus, consult the Service Manual for the printer.

Diagnostics Mode

To enter the Diagnostic Menu, do the following:

1. Turn off the printer.

2. Press and hold 3 and 6.

3. Turn on the printer.

4. Release the buttons when the splash screen appears.

The Diagnostics Menu contains advanced settings and operations used for repair, adjustments or other diagnostic actions.

Configuration Menu

To enter Configuration Menu, do the following:


2. Press and hold Right 2 and 6.



The Configuration Menu contains a set of menus, settings and operations which are infrequently required by a user. Generally, the options made available in this menu group are used to configure a printer for operation.

Network SE Menu

To enter the Network SE Menu, do the following:

1. Enter the Network/Ports menu.

2. Press and hold 9, 7 and 6.

3. Release the buttons when the Network SE Menu appears.

You do not POR the machine to access this menu.

SE Menu From a browser, add “/se” to the device IP address.

(for example: http://158.183.3.2/se) Configure or reset advanced Network settings.

Invalid Engine Code

To enter the Invalid Engine Code state, do the following:


2. Press and hold Right 3, 4 and 6.



This state allows you to POR the printer into a mode that disables the Engine Code and allows the programming of new code into the Engine card. Typically this function is used to reprogram defective Engine code but can be useful in other applications.

Recovery Mode

To enter Recovery Mode, do the following:





This mode will allow the printer to boot from a secondary set of instructions to allow a code flash to the printer. No other functions are available. The screen will have a red background and say "Recovery" . While in this mode, you can ONLY flash code via USB directly connected to a PC.



Network SE Menu

1. In the Administration (Customer) Menu, select the Network/Ports Menu.

2. Select Standard Network.

3. Select STD NET SETUP.

4. Once in the Standard

Network Setup page, press 9, 7 and 6 at the same time.

5. Once you press the buttons, you should be in the Network SE Menu.

The Network SE menu contains advanced network menu tools. Warning: Changing the settings within this menu may cause the printer not to function properly.



X792 Operator Panel

Number Item Description

1 Display Shows the status of the printer

2 Indicator light

• Off – The printer is off. • Blinking green – The printer is warming up, processing data, or printing. • Solid green – The printer is on, but idle. • Solid red – Operator intervention is needed.

3 Sleep

Enables Sleep Mode Note: Touching the screen or any hard button presses can cause the printer to wake from Sleep Mode.

4 Keypad Allows you to enter numbers, letters, or symbols

5 Start • Press to initiate the current job indicated on the display • From the home screen, press to start a copy job with the default settings. • If pressed while a job is scanning, the button has no effect.

6 Stop/Cancel Stops all printer activity Note: A list of options is displayed once Stopped appears on the display.

7 Home Lets you navigate back to the home screen

8 Common Access Card reader .

An option that limits the use of certain printer functions to authenticated users. A common access card is required for use.

9 PictBridge and USB port

Allows the user to connect a PictBridge-enabled digital camera, a USB Bluetooth adapter, or a flash drive to the printer Note: Only the front USB port supports flash drives.

1 2 3

4

5

6

7 8 9



X792 Home Screen

The following page contains a detailed description of the Home Screen buttons and their functions.



X792 Home Screen Buttons Display item Description

Copy Opens the Copy menus

E-mail Opens the E-mail menus

Fax Opens the Fax menus

Scan Opens the Scan menus

Menus Opens the menus. The menus are available only when the printer is in the Ready state.

FTP Opens the File Transfer Protocol (FTP) menus Note: This function must be set up by your system support person. Once it is set up, it appears as a display item.

Status message bar

• Shows the current printer status such as Ready or Busy. Note: Make sure the Ready appears before performing any task.

• Shows printer conditions such as Toner Low • Shows intervention messages and gives instructions so the printer can continue processing.

Status/Supplies Displays a warning or error message whenever the printer requires intervention to continue processing. Touch this button to access the messages screen for more information on the message.

Tips Opens a context-sensitive Help feature within the display touch screens

USB Displays the files on a USB drive.

Bookmarks Held Jobs

Allows you to create, organize, and save a set of bookmarks (URL) into a tree view of folders and file links. Displays all the held jobs

Change Language Launches the Change Keyboard Language pop-up window that allows you to temporarily change the primary language of the keyboard screen Note: After the primary displayed language has been changed and the home screen is not used for a period of time it returns to the default primary language.

Release Held Faxes If this button is shown, then there are held faxes with a scheduled hold time previously set. To access the list of held faxes, touch this button.

Search Held Jobs

Searches on any of the following items and returns search results: • User names for held or confidential print jobs • Job names for held jobs, excluding confidential print jobs • Profile names • Bookmark container or job names • USB container or job names for supported extensions only

Lock Device This button appears on the screen when the printer is unlocked and Device Lockout Personal Identification Number (PIN) has been set. Touching this button opens a PIN entry screen. Entering the correct PIN locks the printer control panel (touch screen and hard buttons).

Unlock Device This button appears on the screen when the printer is locked. The printer control panel buttons and shortcuts cannot be used while it appears. Touching this button opens a PIN entry screen. Entering the correct PIN unlocks the printer control panel (touch screen and hard buttons).

Depending on your configuration, not all buttons may appear. For a complete listing of Home Screen buttons and their functions, please see the Lexmark X792 User’s Guide.



X792 Administrative (Customer) Menu For a complete listing of the printer menu tree, consult the User’s Guide. Not all menus are available for all models (ex. Wireless Menus). The menus commonly accessed are highlighted in blue. X792 Administrative (Customer) Menu Tree Supplies Paper Menu Reports Settings Cyan Cartridge Default Source Menu Settings Page General Settings Magenta Cartridge Paper Size/Type Device Statistics Copy Settings Yellow Cartridge Configure MP Network Setup Page Fax Settings Black Cartridge Substitute Size Network [x] Setup Page E-mail Settings Separator Roll and Pick Assembly Paper Texture Shortcut List FTP Settings

Waste Toner Bottle Paper Weight Fax Job Log Flash Drive Menu Fuser Paper Loading Fax Call Log Print Settings Transfer Module Custom Types Copy Shortcuts Staples Custom Names E-mail Shortcuts Hole Punch Box Customer Scan Sizes Fax Shortcuts Custom Bin Names FTP Shortcuts Universal Setup Profiles List Bin Setup Print Fonts Print Directory Print Demo Asset Report Security Network/Ports Help Manage Shortcuts Edit Security Setups Active NIC Print All Guides Fax Shortcuts Miscellaneous Security Settings Network 1 Copy Guide E-mail Shortcuts

Confidential Print Standard USB E-mail Guide FTP Shortcuts Disk Wiping Parallel [x] Fax Guide Copy Shortcuts Security Audit Log Serial [x] FTP Guide Profile Shortcuts Set Date and Time SMTP Setup Print Defects Guide Information Guide Supplies Guide Option Card Menu A list of installed DLEs (Download Emulators) appears 2

1 Depending on the printer setup, this menu item appears as Standard Network or Network [x]. 2 This menu appears only when one or more DLEs are installed.



X792 Service Menus Several hidden menus exist to configure advanced settings, troubleshoot problems or obtain additional printer information. The settings contained in these menus should not be changed unless it is specifically requested by the Service Manual or technical support. Changing the settings may cause improper operation of the printer. For a complete list of these menus, consult the Service Manual for the printer.

Diagnostics Mode

To enter the Diagnostic Menu, do the following:


2. Press and hold 3 and 6.



The Diagnostics Menu contains advanced settings and operations used for repair, adjustments or other diagnostic actions.

Configuration Menu

To enter Configuration Menu, do the following:


2. Press and hold Right 2 and 6.



The Configuration Menu contains a set of menus, settings and operations which are infrequently required by a user. Generally, the options made available in this menu group are used to configure a printer for operation.

Network SE Menu

To enter the Network SE Menu, do the following:

1. Enter the Network/Ports menu.


3. Release the buttons when the Network SE Menu appears.

You do not POR the machine to access this menu.

SE Menu From a browser, add “/se” to the device IP address.

(for example: http://158.183.3.2/se) Configure or reset advanced Network settings.

Invalid Engine Code

To enter the Invalid Engine Code state, do the following:


2. Press and hold Right 3, 4 and 6.



This state allows you to POR the printer into a mode that disables the Engine Code and allows the programming of new code into the Engine card. Typically this function is used to reprogram defective Engine code but can be useful in other applications.

Recovery Mode

To enter Recovery Mode, do the following:





This mode will allow the printer to boot from a secondary set of instructions to allow a code flash to the printer. No other functions are available. The screen will have a red background and say "Recovery" . While in this mode, you can ONLY flash code via USB directly connected to a PC.



Network SE Menu

1. In the Administration (Customer) Menu, select the Network/Ports Menu.

2. Select Standard Network.

3. Select STD NET SETUP.

4. Once in the Standard

Network Setup page, press 9, 7 and 6 at the same time.

5. Once you press the buttons, you should be in the Network SE Menu.

The Network SE menu contains advanced network menu tools. Warning: Changing the settings within this menu may cause the printer not to function properly.



Print Quality Diagnostic Tips

General Terminology Before diagnosing print quality problems, take a moment to understand the concepts below. This will prevent confusion when diagnosing or escalating a problem.

1. Know your paper orientation when diagnosing a print quality issue.

- References to direction such as horizontal and vertical must be made holding the paper in portrait orientation (long edges to the left and right) with the printed side facing you. Don’t hold the paper in landscape orientation. See below.

2. Know the direction of the print when diagnosing a print quality issue.

3. References to the “Process” or the “Scan” direction mean the following (see picture below):

Note: This printer uses one Laser Printhead which fires four scanning beams across the length of the photoconductors. LED Printheads, on the other hand, fire a simultaneous beam across the photoconductor.

Process is the paper’s direction through the printer that corresponds to the rotation of the photoconductors.

Scan or Scanning is the direction in which the LED or laser writes to the photoconductor and is across the paper path.



Print Quality Rules of Thumb If you encounter print quality problems, follow the tips below. Following these simple rules may solve the problem easily and quickly.

1. Always run a new Menu Settings, Device Statistics or other printer “configuration page” showing the:

- Page Count – Is it time for a maintenance kit?

- Supply Life – are any of the supplies low or exhausted?

- Firmware/Code Levels – Are the code levels old/obsolete?

- Media Settings – does the printer media settings match what is in the Trays?

2. Always check the Media Type, Size, Weight and Texture that is currently being used.

- Is the media Type, Size, Weight and/or Texture within the printer’s manufacturing specification?

- Is the printer’s paper settings configured properly for the media that is used? You can configure a media’s Type, Weight and Texture in the paper menu!

- Are the printer and/or Driver set correctly for the paper type/size?

3. Always print the printer’s Self Test pages (Print Quality Pages or other self test pages).

- How does the print vary from what is expected?

4. Try reseating the supplies.

- Check for damage to the components as you reseat them.

5. Try swapping cartridges to see if a problem follows the supply.

6. Try stopping during mid-print. Is the problem on the ITU or Photoconductor?

7. For tricky problems, think about the Electrophotographic Process Steps. Eliminate the components/areas that couldn’t cause the problem until you are finally left with what could.



Paper Transport Diagnostic Tips

Paper Rules of Thumb Paper jams and feed problems occur for numerous reasons. Sometimes, failure of the equipment is the cause or it can be the result of other external factors. Before replacing parts for a feed problem, ask these questions:

• Is the customer using a supported media type? This is a common problem. Check the printer specifications in the Service Manual or User’s Guide if you are not sure.

• Is the customer using a supported media size? Check the printer specifications in the Service Manual or User’s Guide if you are not sure.

• Is the customer using a supported media weight? This is a common problem. Check the printer specifications in the Service Manual or User’s Guide if you are not sure.

• Have you tried printing with a fresh ream of paper? Paper that is left out of the package for periods of time can dry out or absorb moisture.

• Have you tried printing from a different input source? This will help narrow down the cause of some problems.

• Is too much paper loaded in the Tray? Make sure the stack height does not exceed the indicated maximum height.

• Is the paper in the Tray wrinkled, creased, damp, or curled? Paper will not feed properly if it is damaged. Try a fresh ream of paper.

• Are different media types and/or weights loaded in the Tray (i.e. the customer has both plain paper and cardstock loaded)? This will cause misfeeds.

• Is the relative humidity too high? Too low? This can affect the media and/or printer and its ability to feed properly. Check the printer specifications in the Service Manual or Technical Reference Guide to see if it is located in an ambient environment.

• Is the paper loaded properly in the Tray or option? This is a common problem. Reposition the paper in the Tray or option to make sure that is loaded properly. The paper guides should be flush against the media, but not too tight.

• Are the feed rollers worn because it is time for a maintenance kit? Check the page count of the printer to see if it is time for a maintenance kit to be installed.

• Are there any obstructions in the paper path? If paper, staples, paper clips or other items are in the printer, they can prevent the media from feeding properly.

Save yourself time and effort and always check these external influences before spending time troubleshooting a supposed equipment failure.



Image Orientation in the Tray Depending on whether you are printing a simplex or duplex page, the orientation of the image will be different. It is important to understand the orientation of the page when determining if there is a problem with skew from the duplex unit. Simplex Orientation For a simplex page, side 1’s printed image is face up in the tray with the top of the image on the left.

Duplex Orientation For a duplex page, side 1’s printed image is face down in the tray with the top of the image on the right. Side 2 is actually printed first when duplexing. In other words, the odd numbered pages are the duplexed pages.

Side 2 (Face up)

Bottom Top

Side 1 (Face Down)

Side 1 (Face up)

Top Bottom



Fax Print Quality Diagnostic Tips Because a fax is composed of three main parts spanning two different machines, pinpointing a print quality issue can be challenging. An important step in troubleshooting is to isolate the source of the print quality problem by simple troubleshooting methods. Below is a chart outlining the troubleshooting steps to determine if the sending fax, receiving fax or phone line is the problem source. Please keep in mind that this chart only covers general print quality issues. For more detailed information, it is recommended that you complete Lexmark’s online course called MFP Overview.

Do the pages look normal?

Receiving Fax Quality is poor

Test Receiving Fax

Print the Print Quality Pages in the Receiving Fax.

Use the Copy function in the Sending Fax.

Yes No

Do the pages look normal?

Yes No

See Phone Line at Fault on page 39.

See Sending Fax Machine at Fault on page 38.

See Receiving Fax Machine at Fault on page 39.

Test the Sending Fax



Sending Fax Machine at Fault Problem Description:

• Problems with print quality at the receiving fax, such as corrupt images, lines in the image, top/bottom cut off.

• When you test the Sending Fax by using the Copy function you can reproduce the print quality problem.

Most Likely Cause:

• Dirty flatbed or hardware failure in the scanner.

Resolution:

• Clean the flatbed glass.

• If the original document is being sent from the ADF, try printing a copy with the original document placed on the flatbed glass. If this solves the problem, the problem is in the ADF.

Sending Fax

Receiving Fax

Ana

log

Phon

e Li

ne

Tran

smis

sion

Document Scan

Document Print



Receiving Fax Machine at Fault Problem Description:

• Problems with print quality at the receiving fax, such as corrupt images, lines in the image, top/bottom cut off.

• When you test the Receiving Fax by printing the Self Test pages you can reproduce the print quality problem.

Most Likely Cause:

• Low supplies, dirt or contamination in the printer, hardware failure.

Resolution:

• Check the supply levels by pressing the button on the operator panel or printing a Menu Settings page from the Reports menu.

• Check the printer for accumulation of dust or debris.

• Follow standard troubleshooting procedures for print quality problems. Phone Line at Fault Problem Description:

• Problems with print quality at the receiving fax, such as corrupt images, lines in the image, white horizontal lines, missing rows or top/bottom cut off.

• When you test the Sending Fax and Receiving Fax you cannot reproduce the print quality problem. The problem only occurs during faxing.

Most Likely Cause:

• Noise in the phone line, incoming call (call waiting), incorrect setup of dial type, line type, reception mode or electrical interference.

Resolution:

• Check/setup the dial type, line type and reception mode.

• If the phone line is part of a DSL connection, check to see if a Splitter (Line Filter) is installed or replace the Splitter.

• Disable Call Waiting if it enabled.

• Check the telephone line for static or other noises.

• Remove any electronic equipment (i.e. televisions, microwaves, etc.), motorized devices or wireless/broadcasting equipment that may be located near the fax machine. Electrical interference from the equipment may degrade the telephone line condition.



Complex Parts and Procedures Parts listed in this section are complex for various reasons and are tagged with one or more of the following icons to explain its complexity:

• High degree of technical difficulty in removing/replacing the part.

• Complex/lengthy instructions.

• Special procedures required before, during or after part installation.

• Increased likelihood of servicer error resulting in additional problems, malfunction of the machine or damage.

The instructions for removal, installation and/or special adjustments can be found in the C925 or X925 Service Manuals. Follow the instructions carefully to avoid additional errors, malfunction or breakage. For your awareness, the most complex parts include the ones listed below. When removing, replacing or reinstalling these parts, follow the instructions carefully!

Part Complexity

Printhead Replacement

Flatbed Scanner Assembly

Flatbed Scanner CCD Assembly

ADF Unit Assembly

ADF Duplex CCD Assembly

System Board

EP Drive/Exit Cooling Duct

Staging Paper Path Reference Edge

UICC Card – C792 Only

Scanner Interface Card – X792 Only



Printhead Replacement The removal and replacement of the printhead is not complex, however, the instructions are lengthy and need to be followed closely. In addition, several tedious adjustments need to be completed after installing the part. The most common problems with this part replacement are caused by failure to follow instructions. This may result in damage to the printhead, misalignment of the color planes or wasted time readjusting the printhead. The main steps involved in replacing the printhead include:

• Printhead Verification – check to see if the printhead is the failing part before installing it.

• Installation of the new Printhead – a rough positional adjustment of the new part in the printer.

• Coarse Mechanical Registration – a rough mechanical alignment of the printhead by turning an adjustment screw.

• Dual Diode Alignment – adjusts the positioning of the laser beam at three fixed points across the scan line. This adjustment corrects Linearity Errors and tunes the beam to its ideal location. There are no linearity adjustments for the K plane. Each adjustment value has a range of -32 to +32. All integers within this range can be selected as the input. The actual physical amount of adjustment is ¼ of a 600 dpi pel for each increment, which is 10.6 µm.

• Registration – electronically aligns the Black plane to the printer.

• Color Alignment – electronically adjusts printhead skew and aligns the C, M, Y planes to the K plane.

**When reinstalling the printhead, be careful as you route the printhead ribbon cables through the slotted opening in the rear of the printer. These cables can be switched by accident resulting in damage to the System Board or Printhead causing a “Close Side Door” message followed by a “110.08 Printhead error” message (or other printhead error). For detailed Instructions, see Printhead removal, installation, and alignment in Section 4: Repair of the C792 or X792 Service Manual. In addition, a video demonstrating the alignment is available on Infrature, the Knowledgebase and as a Technical Service Bulletin.

1 2

1 2



Flatbed Scanner Assembly ADF Unit Assembly Flatbed Scanner CCD Assembly ADF Duplex CCD Assembly If one of these parts is replaced or even removed, you should perform the following adjustments:

• Calibrate Scanner – reset the scanner calibration values and check the black levels of the scanner.

• Adjusting Skew for the ADF and Flatbed Scanner – this adjustment does the following:

a. Checks paper squareness

b. Checks for print engine skew

c. Electronic ADF/Flatbed Skew adjustment

d. Mechanical Flatbed or ADF Adjustment

e. Magnification Adjustment (adjusts the bottom margin)

System Board The System Board is a complex removal for several reasons. First, numerous cables plug into this board. To prevent possible damage to the cables from moving parts, it is important that they are reinstalled in their original locations. Second, this part contains Mirrored NVRAM, so it should never be replaced at the same time as other Mirrored NVRAM components. See the Mirrored NVRAM Components section in this guide for complete details and exceptions. Third, the System Board contains the default and custom eSF applications and settings. These are NOT contained in the NVRAM or hard drive, therefore, a System Board failure could result in loss of these applications and their settings if they are not backed up. When a new System Board is installed, the Lexmark default eSF applications and settings are loaded. The best practice is for an administrator to have their eSF applications and settings backed up prior to encountering a problem. In case this hasn’t been done, however, an attempt to back up the data should be performed before replacing the System Board. See the following page for instructions on how to back up the eSF applications and settings.



To back up the solutions, do the following:





5. Access the printer's Web Page from a web browser.

6. Click on Settings



7. Click on Solutions (don’t click Import/Export – the explanation is at the end)

8. Click on Embedded Solutions



9. Select each application individually by clicking on the name (we’ll use Forms and Favorites in this example)

10. Click on Export to create a file of that application’s settings

11. If the Web page cannot be accessed, or an error persists despite trying to boot in Invalid Engine code mode, then there is no way to backup the eSF apps. Make the customer aware of this.



12. Don’t Use the “Global” Import/Export method to back up the eSF applications and settings. There is a size limit of 128kb on the export file.

13. Customers with a large number of applications or settings may exceed the file size limit and have information truncated in the exported file.

14. Once the new System board is installed, follow the same steps as above, however, you will

Import (instead of export) the <filename>.UCF file for each application.

EP Drive/Exit Cooling Duct Most of the cable harnesses are routed around these parts. Care needs to be taken that the cables are routed in their original position, otherwise, damage will occur.

Staging Paper Path Reference Edge The removal and replacement of the Reference Edge is not complex, however, the procedure for aligning the staging paper path reference edge is tedious. The procedure consists of:

• Printing the Printer Registration page.

• Determining if the print is skewed (you will need a metric ruler – See Print Engine Skew Guidelines in this Study Guide).

• Turning the adjustment screw on the reference edge to rotate the page clockwise or anti-clockwise depending on the direction of the skew.

NO!



Mirrored NVRAM Components UICC Card – C792 Only Scanner Interface Card – X792 Only Flatbed Scanner Assembly – X792 Only System Board – C792 and X792 C792 NVRAM Components:

• UICC Card

• System board

X792 MFP NVRAM Components:

• Scanner Interface Card

• Flatbed Scanner Assembly

• System Board

Warning! Observe all ESD precautions while handling electronic parts.

Warning! When replacing any one of the NVRAM components:

• Only replace ONE component at a time – NEVER replace two or more at once.

• Perform a POR before replacing the second component. If this procedure is not followed, the printer will be rendered inoperable.

• These components mirror the critical NVRAM settings for the printer. If you have not already done so, complete the online course Mirrored NVRAM from Lexmark’s online learning site.

Warning! If you must use one the components listed above as a method of troubleshooting, boot the

printer into Diagnostic mode only. This will prevent the NVRAM from copying to the new component. If the printer is allowed to boot normally, however, the NVRAM will copy to the new component and it cannot be used in another printer. It must be returned to the manufacturer.



Other Special Instructions The instructions listed in this section may need to be performed under certain circumstances such as repair, troubleshooting or other reasons.

Cleaning the MFP Document Glass – X792 Only It is important to clean the MFP on a regular basis (about once a month depending on usage) to keep it functioning properly. You should also clean the scanner glass if you encounter print quality problems such as streaks on copied or scanned images. Note: Clean both areas of the scanner glass and both white underside areas.

Warning! Always turn the printer OFF and unplug it before cleaning.

Slightly dampen a soft, lint-free cloth or paper towel with water. Do not use any kind of cleaning agent to clean the glass.

• Do not spray liquid on the glass.

• Wipe the white underside of the ADF cover until it is clean and dry.

• Wipe the white underside of the scanner cover until it is clean and dry.

• Wipe the scanner glass until it is clean and dry.

• Wipe the ADF glass until it is clean and dry.

1

2

3

4



Security Reset Jumper The C792 and X792 printers have a Security Reset Jumper on the System Board which can be used in the event the Administrator password is forgotten (see pictures below). The Security Jumper effect can be configured through the Security Menu on printer’s web page or menus. The choices for the Security Reset Jumper effect are listed below:

• No Security (default setting) – Resets the value of each Access Control to “No Security”. This option preserves all custom security templates and building blocks, however, they will no longer be applied to a function. This option allows the Administrator to create a new password with no loss to some customizations.

• Reset to Defaults – Erases all Security Templates, Building Blocks, Access Controls and passwords that a user has defined and returns the printer security to its original state. This option is not recommended unless a complete reset of the Security Menu is desired.

• No Effect – The position of the security jumper is ignored. No settings will be erased or changed in any way. This option is NOT recommended because passwords cannot be recovered easily; it would require System Board replacement at the cost of the customer (this is not a manufacturing or warranty problem).

Note: Administrators can discourage tampering with the Security Jumper by securing the entire RIP card cage with a Kensington lock

In general, when a jumper is installed over two or more jumper pins, this causes an electrical connection to be made. A predefined set of instructions is programmed on the circuit board which executes depending on the jumper configuration detected.



The movement of the jumper from position A to position B (or position B to position A) triggers the reset, NOT the specific positions. This differs from a CMOS reset on a computer. When the printer is powered on, it labels the current position of the plastic jumper (let’s say position A) as the “home” position. If, at the next POR, the printer detects that the jumper has moved from its previous “home” position (position A) to the “other” position (position B), then it executes the desired effect (as configured in the Security Settings). After performing the reset, the device labels the new position (position B) as the “home” position. See the pictures below. Scenario 1: Scenario 2: To perform a Security Jumper Reset operation, do the following:

• Power the printer off,

• Remove the Kensington lock from the card cage (if installed),

• Remove the small plastic jumper that covers a pair of the jumper’s pins,

• Replace the plastic jumper so that it covers the pins adjacent to its original position,

• Replace and secure the Kensington lock on the card cage (if installed),

• Power the printer on.

Position “A” (Home)

Position “B” (New Home)

The printer powers up with the jumper in this position.

The jumper is changed to this position and then powered on. The printer recognizes the change and executes the configured Security Reset effect.

Position “B” (Home)

Position “A” (New Home)

The printer powers up with the jumper in this position.

The jumper is changed to this position and then powered on. The printer recognizes the change and executes the configured Security Reset effect.



Recovery Mode This is a special mode in which the printer can be booted in case a code flash is interrupted (by turning it off or power failure) and the printer will no longer boot, posts a 959 or hangs during boot. To enter Recovery Mode, do the following:





This mode will allow the printer to boot from a secondary set of instructions to allow a code flash to the printer. No other functions are available. The screen will have a red background and say "Recovery" .

While in this mode, you can ONLY flash code via USB directly connected to a PC.

Print Engine Skew Guidelines It’s important to think about the paper transport system and the components involved in moving paper through the printer. A number of factors could contribute to skew. Before replacing parts, check these items:

• Paper Squareness – Before deciding if the printer is the cause of skewing, it is very important to check the paper to see if it is cut squarely. Remove two consecutive pages from the paper ream. Flip over the top page, and place it facedown onto the bottom page. Tap the pages on a level surface to align the bottom edge. Check top edges to see if the sheets are aligned.

You can see a shadow of the second page behind the first. The paper is not square so print on the

page may look skewed.

The paper is square



• Skew Specification – Determine if the skew on the page is within specification.

- From the Diagnostics menu, navigate to REGISTRATION > Quick Test to print the registration page.

- Measure the difference in the distance (in millimeters) down the page of the far left and far right lines.

- Measure from the edge of the paper to the back line to find L1, L2, T1, T2, R1, R2, B1, and B2 as shown below:

- Determine the following calculations (each number is an absolute value so a + /- is OK):

L2 – L1 = ______

R2 – R1 = ______

T2 – T1 = ______

B2 – B1 = ______



- Check the skew measurements in this table to see if the printer meets the spec.

Note: Is the Skew on the Simplexed or a Duplexed side? Look at the section Image Orientation in the Tray found earlier in this guide to decide which side is skewed.

Skew Specification - Simplex

Paper Size Simplex

Skew Specification

Left Vertical – Paper Length

(L2-L1)

Right Vertical – Paper Length

(R2-R1)

Top – Paper Width

(T2-T1)

Bottom – Paper Width

(B2-B1)

Letter (216mm × 279mm) 0.005mm/mm ≤ 1.4mm1 ≤ 1.4mm1 ≤ 1.0mm1 ≤ 1.0mm1

A4 (210mm × 297mm) 0.007mm/mm ≤ 2.1mm2 ≤ 2.1mm2 ≤ 1.4mm2 ≤ 1.4mm2

1, 2 Calculated by taking the width or length of the paper (in millimeters) and multiplying it by the Simplex Skew Specification: Example using Letter Size Paper:

Paper Width (mm) x Simplex Skew Specification (mm/mm) = Acceptable Skew Amount for Top/Bottom 216mm (letter paper width) x 0.005mm/mm = 1.0mm

Paper Length (mm) x Simplex Skew Specification (mm/mm) = Acceptable Skew Amount for Left/Right

279mm (letter paper length) x 0.005mm/mm = 1.0mm

Skew Specification - Duplex

Paper Size Duplex Skew Specification

Left Vertical – Paper Length

(L2-L1)

Right Vertical – Paper Length

(R2-R1)

Top – Paper Width

(T2-T1)

Bottom – Paper Width

(B2-B1)

Letter (216mm × 279mm) 0.007mm/mm ≤ 2.0mm1 ≤ 2.0mm1 ≤ 1.5mm1 ≤ 1.5mm1

A4 (210mm × 297mm) TBD TBD TBD TBD TBD

1 Calculated by taking the width or length of the paper (in millimeters) and multiplying it by the Duplex Skew Specification: Example using Letter Size Paper:

Paper Width (mm) x Duplex Skew Specification (mm/mm) = Acceptable Skew Amount for Top/Bottom 216mm (letter paper width) x 0.005mm/mm = 1.0mm

Paper Length (mm) x Duplex Skew Specification (mm/mm) = Acceptable Skew Amount for Left/Right

279mm (letter paper length) x 0.005mm/mm = 1.0mm



• Uneven Surface – Examine the printer to see if it sits on a sturdy, even plane with all four feet securely on the surface. If not, the printer frame will torque and cause print skew or other hardware failures.

• Tray Guides – Check the two tray guides to see if they are broken or not placed against the

paper properly. These guides help keep the paper positioned so it doesn’t twist as it is pulled into the paper path by the pick rolls.

The Tray Guides are positioned securely against the paper.

The front Tray Guide is too snug against the paper and causing it to bend.

Tray Guides

NO!



• Catch Points in the Tray – Check the deflector on the left side of the paper tray for nicks or damage that may cause the paper to catch and skew as it is fed from the tray.

• Paper Jammed behind the Tray – Check for paper behind the tray inside the printer. Paper in this area will move the tray out of position and cause the paper to feed crooked into the printer.

• Tray Seated Fully – Check the Tray to make sure it is fully closed.



• Tray Bias – As the tray is inserted into the printer, is it maneuvered into a fixed position by several plastic bias points and a Bias Spring/Roller. If one of these parts is broken, the tray will not be in its proper position relative to the pick rolls and the paper will not feed properly.

• Tray Rails – Slide the Tray out of the printer and remove it from the metal rails. Check the rails to see if they are bent or damaged. The tray may not be in its proper position relative to the pick rolls if the rails are damaged.



• Autocompensator – Several parts of the Autocomp could cause skew:

- Check the pick tires for wear. In addition, see if one tire is more worn than the other or if there are uneven wear patterns.

- Check to make sure the Bushing that locks the Autocomp to the machine is secured properly.

Locked Unlocked



• Staging Deflector and Duplex Paper Guide – As the paper feeds out of the Tray, it passes between the Staging Deflector and Duplex Paper Guide. Open the left side door and check the Staging Deflector for catch points, broken sensor flags and proper placement. Check the Duplex paper Guide for catch points or breakage.

Staging Defector

Duplex Paper Guide



• Reference Edge – This printer does not use registration rolls to adjust paper prior to entering the EP Process; it uses a Reference Edge to adjust skew as the paper travels to the 2nd Transfer Roll and ITU.

- Skew is corrected by two angled rollers driving the paper up against the side of the metal

plate. The path of the paper through the Reference Edge is slightly different if the paper is entering from the duplex unit.

Angled Rollers




- Check the mounting screws on the Reference Edge to make sure they are secure. DO NOT turn the skew adjustment screw! (The picture below is shown with the Staging Deflector Removed).

• Printhead – Check the 6 Printhead mounting screws to make sure they are secure. Loose screws may allow the Printhead to move during the print process and cause skew. (The picture below is shown looking down from above without the scanner and/or top cover.)



- Skew caused by the Printhead typically looks different than skew from the rest of the printer. Look at the examples below:

Print Engine Skew Adjustment Once all the components listed above are eliminated as the source of the skew problem, the next step is to adjust the printer to correct skew. Before performing any adjustments, make sure the skew is NOT related to the Printhead, Flatbed and/or Scanner. These components have different skew correction procedures.

1. Enter Diagnostics mode

2. From the Diagnostics menu, navigate to REGISTRATION > Quick Test to print the registration page.

Note: If you can’t see both the right and left alignment marks on the top of the test page, adjust the top margin until the marks are visible.

• To align the top margin:

1) From the REGISTRATION menu, select Top Margin.

2) Adjust the values to move the top alignment marks to the top edge of the page.

3) Increasing the value moves the alignment marks up the page.

4) Decreasing the value moves the alignment marks down the page.

5) Reprint the test page and make adjustments as needed until you are satisfied with the alignment.

Printhead Skew – the image is shifted into a Rhomboid shape.

Printer Skew – the image is rotated on the page



The Registration page shows that the image is skewed in a clockwise rotation (the right side is

too far down).

The Registration page is not skewed.

3. If the left and right top alignment marks are not parallel with the top edge of the page, then turn the adjustment screw on the Reference Edge.

• Turn the screw clockwise to move the left marks up the page,

• Turn it counterclockwise to move the right marks up.

4. Reprint the Quick Test page to check the changes, and then continue adjusting the screw as needed.



Scanner Skew It is important to rule out the possibility of a print engine skew problem or uneven paper before making adjustments on the scanner unit.

• Paper Squareness – Before deciding if the printer or scanner is the cause of skewing, it is very important to check the paper to see if it is cut squarely. Remove two consecutive pages from the paper ream. Flip over the top page, and place it facedown onto the bottom page. Tap the pages on a level surface to align the bottom edge. Check top edges to see if the sheets are aligned.

• Print Engine Registration and Skew – Print a registration page from Diagnostics Mode.

- Navigate to REGISTRATION > Quick Test to print the registration page.

- If you can’t see both the right and left alignment marks on the top of the test page, adjust the top margin until the marks are visible.

a. From the REGISTRATION menu, select Top Margin.

b. Adjust the values to move the top alignment marks to the top edge of the page.

c. Increasing the value moves the alignment marks up the page.

d. Decreasing the value moves the alignment marks down the page.

- Reprint the test page and make adjustments as needed until you are satisfied with the alignment.

You can see a shadow of the second page behind the first. The paper is not square so print on the

page may look skewed.

The paper is square



The Registration page shows that the image is skewed in a clockwise rotation (the right side is

too far down).

The Registration page is not skewed.

- Below, the left page shows that the print is skewed from the printer. You will need to address the printer skew before attempting to adjust the scanner. The right page, however, is perfectly aligned.



Scanner Skew Adjustment The scanner skew measurements will vary somewhat between test pages. Make sure that you print several pages before determining if the scanner is within acceptable skew limits. Things of which you should be familiar:

• FADF – Front side ADF. This is the 1st page (side 1) of a document as scanned from the ADF.

• BADF – Back Side ADF. This is the 2nd page (side 2) of a duplexed document as scanned from the ADF.

• FB – Flatbed

• Leading Edge – This is the first edge of the document to enter the ADF.

• Trailing Edge – This is the last edge of the document to enter the ADF.

• Vertical – the left and right sides of the document.

Most adjustments will affect all three skew measurements (leading edge, trailing edge, and vertical). Check to make sure all three measurements are in spec with good margins before completing the repair. The goal is to have all three measurements less than 0.005mm/mm after adjustment. Adjustments for FADF and BADF will change the skew in different directions. Be sure to check the FADF, BADF for the leading edge, trailing edge and verticals to make sure that fixing one does not make another one worse.

Feed Direction

Vertical

Leading Edge

Trailing Edge

FADF

BADF

Vertical



Print skew, Scan skew and Copy skew all use the same nomenclature for direction of rotation.

• Positive skew is counter-clockwise rotation

• Negative skew is clockwise rotation. See the Lexmark X792 Service Manual for detailed guidelines on adjusting scanner skew.

Documents

Lexmark C792-X792 Color Product Study Guidecontentdelivery.lexmark.com/webcontent/training/CX792/C792_X792... · Lexmark C792/X792 Color Product Study Guide Rev 2.2 For Training Purposes