Question about Lexmark T640 Laser Printer

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Will not print with giving an error message

Everytime we try to print something, the printer beeps twice and say, "Change tray 1 to plain paper letter". We press the down arrow twice and the selection is, "use current tray 1". We then press the check button and the print job then prints. If we print something else immediately, it will print. If we wait say 30 seconds or more to print, the error messages start all over again.

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  • jeffh1091 Jul 25, 2008

    Also having the same problem. I'm using a special paper size (8.5 X 8.5) and I just want it to always print, forget about that particular error.

  • poo9 Oct 21, 2008

    No matter what combination of settings we use on both the printer setup and the printer software, certain computers will always trigger the Lexmark C780 to ask for the paper to be changed to Plain (even though everything's already set to "plain paper in there!)

    Pressing "continue" doesn't do anything - it just asks again infinitely. The only way out is to manuallly select "use current Tray 1" on every single print job!

    Very frustrating indeed.



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On left side of tray are 3 fingers, for letter size paper bottom 2 are out, next one in. verify slider on bottom of tray is in place. Essentially paper not sensed correctly. print config page and see paper size

Posted on Feb 15, 2009


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You will need to change your paper handling.
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In the printer setup menu. You need to change the paper type for tray 1. It's likely set to a different type of paper (maybe card stock?).

The printer driver will specify what type of paper is being used, and the printer doesn't know what type of paper is in it other than what it is told, so a conflict occurs.

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Please print a configuration page from the control panel of the printer
- Menu > Information menu > print configuration.
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Following setting should reflect.
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Tray 2: A4 size / Plain Type

If the above settings are not reflecting in the configuration page, please change accordingly by browsing on the control panel of the printer to:
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Tray 1 Type: Any
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Let me know if that helps to solve the issue.


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There is a Paper Menu option somewhere in the menus on the op-panel. You need to go to the Paper Type option and change the Paper Type for Tray 1 to plain paper. You can also hit the Select button when you get this message and you will print.

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