Lexmark W840 User Manual

							Solving print quality problems
101
Troubleshooting
Entire page is white.  Make sure the packaging material is removed from the photoconductor kit.
 Check the photoconductor kit to be sure it is installed correctly.
 Replace the photoconductor kit.
Streaks appear on the page.  If you are using preprinted forms, make sure the ink can withstand temperatures of 
230°C (446°F).
 Replace the photoconductor kit or toner cartridge.
Printing is too dark.  Change the Toner Darkness setting in the Quality menu.
 Change the Brightness setting in the Quality menu.
 Change the Contrast setting in the Quality menu.
Note:Macintosh computer users should make sure the lines per inch (lpi) setting is not 
set too high in the software application.
Characters have jagged or 
uneven edges. Change the Print Resolution setting in the Quality menu to 600 dpi, 1200 dpi, or 2400 
Image Q.
 Enable Enhance Fine Lines.
 If you are using downloaded fonts, verify the fonts are supported by the printer, the 
host computer, and the software application.
ProblemAction
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							Solving print quality problems
102
Troubleshooting
Part or all of the page is 
printed in black.Check the photoconductor kit to see if it is installed correctly. 
The job prints, but the top and 
side margins are incorrect.  Make sure the Paper Size setting in the Paper menu is correct.
 Make sure the margins are set correctly in your software application.
Ghost images appear.  Make sure the Paper Type setting in the Paper menu is correct.
 Replace the photoconductor kit.
Gray background prints.  The Toner Darkness setting may be too dark. Change the Toner Darkness setting in 
the Quality menu.
 Adjust the Brightness to a darker setting.
 Adjust the Contrast to a darker setting.
 The photoconductor kit may be defective. Replace the photoconductor kit.
Some of the print is cut off on 
the sides, top, or bottom of 
the media.Move the guides in the tray to the proper positions for the size loaded.
Print is skewed, or 
inappropriately slanted.
Transparency print quality is 
poor. Use only transparencies recommended by the printer manufacturer.
 Make sure the Paper Type setting in the Paper menu is set to Transparency.
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							Solving print quality problems
103
Troubleshooting
The Quality menu operator panel options can be adjusted to help improve print quality.
In addition, the Enhance Fine Lines and Gray Correction options can be enabled to improve print quality. These settings are 
available on the driver and on the printer Embedded Web Server (EWS) interface. For more information about these 
options, see the driver help. 
Menu selectionPurposeVal u e s
Print Resolution To select printed output resolution 600 dpi
1200 dpi
2400 Image Quality*
Toner Darkness Lightens or darkens printed output and 
conserves toner1–108* is the default setting.
Select a lower number to lighten the 
printed output or save toner.
Brightness Adjusts the gray value of printed 
objects-6 – +60* is the default setting.
Contrast Adjusts the contrast of printed objects 0–50* is the default setting.
Driver optionPurposeVal u e s†
Enhance Fine Lines A selection to enable a print mode 
preferable for certain files containing 
fine line detail, such as architectural 
drawings, maps, electronic circuit 
diagrams and flow chartsOn In the driver, enable the check box.
Off* In the driver, disable the check box.
Gray Correction Automatically adjusts the contrast 
enhancement applied to imagesAuto In the driver, enable the check box.
Off* In the driver, disable the check box.
† Values marked by an asterisk (*) are the factory default settings.
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							Administrative support
104
10Administrative support
Adjusting operator panel brightness and contrast
The LCD operator panel contrast and brightness can be adjusted through the Utilities menu. For more information, see the 
Menus and Messages Guide.
The LCD Brightness and LCD Contrast settings are adjusted separately. To change the LCD Brightness or LCD Contrast 
settings:
1Make sure your printer is on.
2Press   on the operator panel.
3Press  until  Settings appears, and then press  .
4Press  until  Utilities Menu appears, and then press  .
5Press   until   appears next to the LCD setting you want to change, and then press  .
6Press   to increase the brightness or contrast or press   to decrease the brightness or contrast.
7When the adjustment is complete, press  .
This saves this setting as the new user default and the printer returns to Ready.
Disabling operator panel menus
Since many people could be using the printer, an administrator may choose to lock the operator panel menus to keep 
others from changing menu settings from the operator panel.
To disable the operator panel menus so that changes cannot be made to the printer default settings:
1Turn the printer off.
Note:Disabling the operator panel menus does not prevent access to Print and Hold functionality.
2Press and hold   and   while turning the printer on.
3Release both buttons when Performing Self Test appears on the display.
The printer performs its power-on sequence, and then Config Menu appears on the first line of the display.
4Press  until  Panel Menus appears, and then press  .
5Press  until  Disable appears, and then press  .
The following messages appear briefly: Submitting Selection and Disabling Menus. The operator panel 
returns to Panel Menus.
6Press  until  Exit Config Menus appears, and then press  .
Activating Menu Changes appears. The menus are disabled. 
Resetting the Printer appears briefly followed by a clock. The operator panel then returns to Ready.
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							Enabling operator panel menus
105
Administrative support
Enabling operator panel menus
1Turn the printer off.
2Press and hold   and   while turning the printer on.
3Release both buttons when Performing Self Test appears on the display.
The printer performs its power-on sequence, and then Config Menu appears on the first line of the display.
4Press  until  Panel Menus appears, and then press  .
5Press  until  Enable appears, and then press  .
The following messages appear briefly in succession: Submitting Selection and Enabling Menus. 
The operator panel returns to Panel Menus.
6Press  until  Exit Config Menus appears, and then press  .
Activating Menu Changes appears. The menus are enabled.
Resetting the Printer appears briefly followed by a clock. The operator panel then returns to Ready.
Restoring factory default settings
When you first enter the printer menus from the operator panel, you may notice an asterisk (*) to the left of a value in the 
menus. This asterisk indicates the factory default setting. These settings are the original printer settings. (Factory defaults 
may vary for different regions.)
When you select a new setting from the operator panel, Submitting Selection appears. When the Submitting Selection 
message disappears, an asterisk appears next to the setting to identify it as the current user default setting. These settings 
are active until new ones are stored or the factory defaults are restored.
To restore the original printer factory default settings:
Warning:All downloaded resources (fonts, macros, and symbol sets) in printer memory (RAM) will be deleted. 
(Resources residing in flash memory or on the optional hard disk remain unaffected.)
1Make sure the printer is on and Ready appears on the display.
2Press   on the operator panel.
3Press  until  Settings appears, and then press  .
4Press  until  Setup Menu appears, and then press  .
5Press  until  Factory Defaults appears, and then press  .
6Press  until  Restore Now appears, and then press  .
7The message Restoring Factory Defaults appears, followed by the Ready message.
When you select Restore:
No other button actions are available on the operator panel while Restoring Factory Defaults appears.
All menu settings return to the factory default values, except:
–The operator panel Display Language setting in the Setup menu.
–All settings in the Parallel menu, Serial menu, Network menu, and USB menu.
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							Adjusting Power Saver
106
Administrative support
Adjusting Power Saver
To  a d j u s t  t h e Power Saver setting:
1Make sure the printer is on and Ready appears on the display.
2Press   on the operator panel.
3Press  until  Settings appears, and then press  .
4Press  until  Setup Menu appears, and then press  .
5Press  until  Power Saver appears, and then press  .
6Using the numeric pad or the right and left arrows on the operator panel, enter the number of minutes for the 
printer to wait before entering Power Saver.
The settings available range from 2–240 minutes. If you want to turn Power Saver off, see Disabling Power Saver 
on page 106.
7Press .
Submitting Selection appears.
Note:You can also adjust the Power Saver setting by issuing a Printer Job Language (PJL) command. For 
more information, see the Technical Reference available on our Lexmark Web site at 
www.lexmark.com.
Disabling Power Saver
Disabling Power Saver is a two step process. First, you must turn the variable on, and then select the variable. To disable 
Power  S ave r :
1Turn the printer off.
2Press and hold   and   while turning the printer on.
3Release both buttons when Performing Self Test appears on the display.
The printer performs its power-on sequence, and then Config Menu appears on the first line of the display.
4Press  until  Energy Conserve appears, and then press  .
5Press  until  Off appears, and then press  .
Submitting Selection appears.
The operator panel returns to Energy Conserve.
6Press  until  Exit Config Menus appears, and then press  .
Resetting the Printer appears briefly followed by a clock. The operator panel then returns to Ready.
7Make sure Ready appears.
8Press   on the operator panel.
9Press  until  Settings appears, and then press  .
10Press  until  Setup Menu appears, and then press  .
11Press  until  Power Saver appears, and then press  .
12Use either the numeric keypad or the right and left arrows to enter 0 (zero). Disabled appears, and then press 
.
Submitting Selection appears. Power Saver is now disabled.
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							Encrypting the disk
107
Administrative support
Encrypting the disk
Warning:All resources on the hard disk will be deleted. (Resources residing in flash memory or in RAM remain 
unaffected.)
Note:This setting is only available when a hard disk is installed.
1Turn the printer off.
2Press and hold   and   while turning the printer on.
3Release both buttons when Performing Self Test appears on the display.
The printer performs its power-on sequence, and then Config Menu appears on the first line of the display.
4Press  until  Disk Encryption appears, and then press  .
5Press  until  Enable appears, and then press  .
Contents will be lost. Continue? appears.
6Press  until  Yes appears, and then press  .
The Encrypting Disk progress bar appears.
7When disk encryption has finished, click  .
8Press  until  Exit Config Menu appears, and then press  .
To disable disk encryption:
1Turn the printer off.
2Press and hold   and   while turning the printer on.
3Release both buttons when Performing Self Test appears on the display.
The printer performs its power-on sequence, and then Config Menu appears on the first line of the display.
4Press  until  Disk Encryption appears, and then press  .
5Press  until  Disable appears, and then press  .
Contents will be lost. Continue? appears.
6Press  until  Yes appears, and then press  .
The Encrypting Disk progress bar appears.
7When disk encryption has finished, click  .
8Press  until  Exit Config Menu appears, and then press  .
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							Setting security using the Embedded Web Server (EWS)
108
Administrative support
Setting security using the Embedded Web Server (EWS)
You can enhance the security of network communications and device configuration by using the advanced security options. 
These features are available through the Web page of the device.
Setting the system password
Setting the system password protects configuration of the Embedded Web Server. A system password is also required for 
Secure mode and confidential communication with MVP.
To set the system password:
1Open your Web browser. In the address line, enter the IP address of the printer you want to configure using the 
for mat: http: //ip_address/.
2Click Configuration.
3Under Other Settings, click Security.
4Click Create Password, if one has not been set previously. If a password has already been set, click Change or 
Remove Password.
Using the secure Embedded Web Server
The SSL (Secure Sockets Layer) allows for secure connections to the Web server within the print device. You can connect 
to the Embedded Web Server more securely by connecting to the SSL port instead of the default HTTP port. The SSL port 
connection will encrypt all Web server network communications between the PC and the printer. To connect to the SSL 
port:
Open your Web browser. In the address line, enter the IP address of the printer you want to configure using the format: 
https: //ip_address/.
Supporting SNMPv3 (Simple Network Management Protocol version 3)
SNMPv3 protocol allows for encrypted and authenticated network communications. It also lets the administrator select a 
desired level of security. Prior to use, at least one user name and password must be established from the settings page. To 
configure for SNMPv3 through the Embedded Web Server of the printer:
1Open your Web browser. In the address line, enter the IP address of the printer you want to configure using the 
for mat: http://ip_address/.
2Click Configuration.
3Under Other Settings, click Network/Ports.
4Click SNMP.
SNMPv3 authentication and encryption has three levels of support:
No authentication and no encryption
Authentication with no encryption
Authentication and encryption
Note:Only the selected level and later may be used to communicate.
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							Setting security using the Embedded Web Server (EWS)
109
Administrative support
Supporting IPSec (Internet Protocol Security)
IP Security protocol provides authentication and encryption of communications at the network layer allowing all application 
and network communications over the IP protocol to be secure. IPSec can be set up between the printer and up to five 
hosts, using both IPv4 and IPv6. To configure IPSec through the Embedded Web Server: 
1Open your Web browser. In the address line, enter the IP address of the printer you want to configure using the 
for mat: http://ip_address/.
2Click Configuration.
3Under Other Settings, click Network/Ports.
4Click IPSec.
Two types of authentication are supported for IPSec:
Shared Key Authentication—Any ASCII phrase shared among all the participating hosts. This is the easiest way 
to configure when only a few hosts on the network use IPSec.
Certificate Authentication—Allows any hosts or subnet of hosts to authenticate for IPSec. Each host must have 
a public/private key pair. Validate Peer Certificate is enabled by default, requiring each host to have a signed 
certificate and the authority certificate must be installed. Each host must have its identifier in the Subject Alternate 
Name of the signed certificate.
Note:After a device is configured for IPSec with a host, IPSec is required for any IP communication to take 
place. 
Using Secure mode
You can configure the TCP and UDP ports to one of three modes:
Disabled—Never allows network connections to this port.
Secure and Unsecure—Allows the port to remain open, even in Secure mode.
Unsecured Only—Allows the port to only open when the printer is not in Secure mode
Note:A password must be set to enable Secure mode. Once enabled, only the ports set to Secure and 
Unsecure will be open.
To configure the Secure mode for TCP and UDP ports from the Embedded Web Server:
1Open your Web browser. In the address line, enter the IP address of the printer you want to configure using the 
for mat: http://ip_address/.
2Click Configuration.
3Under Other Settings, click Network/Ports.
4Click TCP/IP Port Access.
Note:Disabling ports will disable function on the printer.
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							Setting security using the Embedded Web Server (EWS)
110
Administrative support
Using 802.1x Authenticating
802.1x port authentication allows the printer to join networks that require authentication before allowing access. 802.1x port 
authentication can be used with the WPA (Wi-Fi Protected Access) feature of an optional internal wireless print server to 
provide WPA-Enterprise security support.
Support for 802.1x requires the establishment of credentials for the printer. The printer must be known to the Authentication 
Server (AS). The AS will allow network access to devices presenting a valid set of credentials which typically involves a 
name/password combination and possibly a certificate. The AS will allow network access to printers presenting a valid set 
of credentials. You can manage the credentials by using the Embedded Web Server of the printer. To use certificates as 
part of the credentials:
1Open your Web browser. In the address line, enter the IP address of the printer you want to configure using the 
for mat: http://ip_address/.
2Click Configuration.
3Under Other Settings, click Network/Ports.
4Click Certificate Management.
To enable and configure 802.1x on the Embedded Web Server after installing the required certificates:
1Open your Web browser. In the address line, enter the IP address of the printer you want to configure using the 
for mat: http://ip_address/.
2Click Configuration.
3Under Other Settings, click Network/Ports.
4Click 802.1x Authentication.
Note:If an optional internal wireless print server is installed, click Wireless instead of 802.1x 
Authentication.
Locking the operator panel menus
Operator Panel Menu Lockout lets you create a PIN number and choose specific menus to lock. Each time a locked menu 
is selected, the user will be prompted to enter the correct PIN at the operator panel. The PIN does not affect any access 
through the EWS. To lock operator panel menus:
1Open your Web browser. In the address line, enter the IP address of the printer you want to configure using the 
for mat: http://ip_address/.
2Click Configuration.
3Under Other Settings, click Security.
4Click Menu Lockout Setup.
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