Lexmark T640dtn User Manual

Setting security using the Embedded Web Server (EWS)
101
Administrative support
certificate and the certificate 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...

Setting security using the Embedded Web Server (EWS)
102
Administrative support
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...

3
Contents
Chapter 1: Learning about the printer  .............................................................................. 6
Identifying printers  ........................................................................................................................................... 6
Understanding the printer operator panel  ........................................................................................................ 9
Chapter 2: Installing drivers for local printing...

Printing multi-language PDFs
104
Troubleshooting
Printing multi-language PDFs
Solving printing problems
SymptomCauseSolution
Some documents do not 
print.The documents contain 
unavailable fonts.1Open the document you want to print in Adobe Acrobat.
2Click the printer icon.
The Print dialog appears.
3Check the Print as image box.
4Click OK.
SymptomCause Solution
The operator panel 
display is blank or 
displays only diamonds.The printer self test 
failed.Turn the printer off, wait about 10 seconds, and...

Solving printing problems
105
Troubleshooting
Held jobs do not print. A formatting error has 
occurred. Print the job. (Only part of the job may print.)
 Delete the job.
 Free up additional printer memory by scrolling through the list of 
held jobs and deleting others you have sent to the printer. The printer has 
insufficient memory.
The printer has received 
invalid data.Delete the job.
Job takes longer than 
expected to print.The job is too complex. Reduce the complexity of your print job by...

Solving option problems
106
Troubleshooting
Solving option problems
If an option does not operate correctly after it is installed or if it quits working:
Turn the printer off, wait for about 10 seconds, and turn the printer on. If this does not fix the problem, unplug the 
printer, and check the connection between the option and printer.
Print the menu settings page and check to see if the option is listed in the Installed Options list. If the option is not 
listed, reinstall it. See Printing the menu...

Solving option problems
107
Troubleshooting
Internal print 
server Make sure the internal print server (also called an internal network adapter or INA) is 
securely connected to the printer system board.
 Make sure you are using the correct cable, that it is securely connected, and the 
network software is correctly set up.
See the drivers CD that shipped with the printer for more details.
Large capacity 
feeder (2000-sheet 
drawer)See Solving 2000-sheet drawer problems.
Output expander Make sure the...

Solving option problems
108
Troubleshooting
Solving 2000-sheet drawer problems
ProblemSolution
The elevator tray does not raise when the 
loading door is closed, or the elevator tray 
does not lower when the door is opened and 
the elevator button is pushed.Check the following:
 The printer is properly attached to the 2000-sheet drawer.
 The printer is powered on.
 The power cord is plugged firmly into the back of the 2000-sheet 
drawer.
 The power cord is plugged into an outlet.
 The outlet has...

Solving paper feed problems
109
Troubleshooting
Solving paper feed problems
SymptomCauseSolution
Paper frequently jams.  You are using paper that does not 
meet the printer specifications.Use recommended paper and other specialty media.
See the Card Stock & Label Guide available on our 
Lexmark Web site at www.lexmark.com for detailed 
specifications.
See Avoiding jams for information that can help prevent 
jams from occurring.
You have loaded too much paper 
or too many envelopes.Make sure the stack of...

Solving print quality problems
110
Troubleshooting
Solving print quality problems
The information in the following table may help you solve print quality problems. If these suggestions still do not correct the 
problem, call for service. You may have a printer part that requires adjustment or replacement.
ProblemAction
Print is too light.   The toner may be low. To utilize the remaining toner, remove the cartridge by gripping 
the handles with both hands. With the cartridge arrows pointing downward,...