Question about Lexmark T640 Laser Printer

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Lexmark T640 LCD display went blank

The printer still works, but no characters show in the LCD display.

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  • Anonymous Jan 13, 2009

    can you replace the screen on the T640? Mine is out.

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  • 8,637 Answers

Normal 0 Could have a corrupt driver.
Disconnect the printer or at least be sure it is turned off. I'd do both and when the CD software program asks you to connect the printer to the USB port, do so and it should again work properly.
Hope this helps. Bud

Posted on Jan 29, 2009

  • garlandmcclu Sep 15, 2013

    When I replace the display I get a erra message "ram mismatch"

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1 Answer

Lcd replacement for C510


According to the User Manual on page 82:
"If the messages do not appear, turn the printer off and
contact the Lexmark Customer Support Center at 1-859-
232-3000 or http://support.lexmark.com. "

Attaching User Manual.
http://images.lexmark.com/publications/pdfs/c510/eng/userref.pdf

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Lexmark T640 LCD blank..


To check if this is a hardware issue, please print a menu settings page. The purpose of this diagnostic is to check if this is a software issue or a hardware issue.



1. Press Menu to display Menus.
2. Press "down" until the "check" appears next to Reports.
3. Press "Check".
4. Press "down" until the "check" appears next to Menu Settings Page.
5. Press "check".
The message Printing Menus Settings appears on the display.
The printer returns to the Ready state after the menu settings page prints.


If the menu settings page printed without the dots, this would be a software issue. In that case, please call our Technical Support Hotline on (800) 539-6275.

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How do we feed envelopes to print?


The Lexmark T640 and similar printers requires a separate part known as an Envelope Feeder. They can be purchased at your local office supplies store.
http://www.officedepot.com/a/products/430730/Lexmark-85-Envelope-Feeder-For-T640/

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I'm working on a Lexmark E450dn that won't POST. The op panel is lit and the LED is green. Will replacing the controller card fix this?


Hi. If the LCD is lit but without character displayed, go with op panel replacement first because it could just be the LCD since it's still showing ready. Hope this helps.

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1 Answer

Lost cd for lexmark t640 - need to install


Download the device-driver software from:

http://support.lexmark.com

Enter 'T640' and do a search.
Click the "downloads" tab to find the drivers (Mac? XP? Vista? Windows 7?).

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1 Answer

The control panel display is blank on my lexmark x6570 printer


If the LCD on the operator panel constantly displays black bars/boxes or other unusual characters, take the following steps:
1. Disconnect the power supply from the printer.
2. Wait for about one minute, then reconnect the power supply and check the LCD display.
3. If black boxes/bars or unusual characters are still displaying constantly, move the power supply to a different power outlet.
4. If the black boxes/bars or unusual characters are still displaying, the scanner ribbon cable may need to be reseated. Do the following:

1. Lift the scanner flatbed. (Open the printer as if attempting to install cartridges.)
2. Look in the back right corner of the 6150/70 for an access cover.
3. Press firmly on the front right corner of the access cover to reseat the scanner ribbon cable that is located underneath the access panel.

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Please go www.lexmark.com >>Technical Support.

Place the T640 model number into the first search box. When the T640 block opens up do a search for "ENUS23982."

Don

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1 Answer

T640 has ethernet port but not on networkh-m-dThaepbd'tsuomn,ndih


Please, go through the printer's menus and make sure that the Ethernet port is activated.

You can also do this by printing out the printer's menus and checking the network configuration on the printer.

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Looking for a Lexmark Optra T640 Service manual ??


Those links do not work. Stop trying to make money off of material that doesn't belong to you.

Please someone post a link to a FREE download.

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1 Answer

Network connections to Lexmark T640 Laser Printer


Might try going into the printer setup on each computer and set it to print after the current job is finished. Let me know :-)

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