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Black led failure - Printers & Copiers

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  • keithcjr Jan 02, 2009

    I have a black led failure service code U21 I need to be able to order the part and replace it. This is a xerox Phaser 7400DN.

  • keithcjr Jan 02, 2009

    That URL simply shows how to remanufacture the cartridge I found that site with a google look up myself

  • keithcjr Jan 02, 2009

    This is a printer not a copy machine the buttons except the pink clear button do not exist

  • keithcjr Jan 02, 2009

    led = light emitting diode

  • keithcjr Jan 02, 2009

    The part I am looking for is not shown at that site

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8 Answers

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Hi i think there is a error message comming on .......then it should be replaced

Posted on Jan 02, 2009

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All you have to do is turn the power off and unplug the machine for 10 seconds, plug it back in and turn on. Good luck

Posted on Jan 02, 2009

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Remove the black ink cartridge. Clean it up and reinstall it. Go to printer toolbox and select CLEAN CARTRIDGE, let it do its thang.

Posted on Jan 02, 2009

  • Dan Webster
    Dan Webster Jan 02, 2009

    replace or clean the black ink cartridge. If you have refilled this cartridge manually then reinstall it and go into the printer toolbox and set it to clean the cartridge.

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You can purchase supplies here

http://www.office.xerox.com/printers/color-printers/phaser-7400/supl-enus.html

Posted on Jan 02, 2009

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#1 Check the Black LED assembly to properly be installed.
#2 Inspect the wiring harness leading up to the assembly.
#3 Replace the engine controller board

Posted on Jan 02, 2009

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  • blueextc3221
    blueextc3221 Jan 02, 2009


    Troubleshooting Procedure Table

    Steps Actions and Questions Yes No

    1 Cycle power to the printer.

    Does the error still appear?

    Go to step [2]. Complete

    2 Try to isolate the problem LED Head by

    swapping with another LED Head.

    Does the error move with the LED Head?

    Replace the LED

    Head.

    Go to step [3].

    3 Ensure the wiring harness to the LED

    Head is properly connected and not

    damaged, misaligned or crimped.

    Is the wiring harness defective?

    Reconnect or

    replace wiring

    harness.

    Go to step [4].

    4 Check continuity between the Toner

    Sensor Board and the Engine Controller

    Board.

    Is there continuity?

    Replace the

    Engine Controller

    Board.

    Replace the Toner

    Sensor Board

    and/or Wiring

    Harness.

  • blueextc3221
    blueextc3221 Jan 02, 2009

    An LED printer is a recently-developed type of computer printer. LED technology uses a light-emitting diode array as a light source in the printhead. The LED bar pulse-flashes across the entire page width and creates the image on the print drum or belt as it moves past.

    LEDs are more efficient mechanically than conventional laser printers, since they have fewer moving parts. Depending on design, LED printers can have faster rates of print than some laser-based designs, and are generally cheaper to manufacture. Laser systems rely on elaborate combinations of rotating mirrors and lenses that must remain in alignment throughout their use. The laser scans from one end of a line to another, then starts on the next line. Unlike laser printers, the LED printhead is solid-state and has no moving parts.

  • blueextc3221
    blueextc3221 Jan 02, 2009

    The LED im referring to is the CARTRIDGE as you may call it.

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Here you can have toner cartridge for Xerox 7400 printer.

Posted on Jan 02, 2009

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  1. Find the pink Clear button on the Control Panel of the WorkCentre.
  2. Find the button below the word Auto.
  3. Press these buttons in the following sequence: [Clear], [Auto], [Clear], [Auto] NOTE: All of the lights on the Control Panel should go out and the LED Display should go blank. If the lights do not go out, then repeat step 3 until they do. It may be necessary to increase or decrease the pace of the [Clear], [Auto], [Clear], [Auto] sequence.
  4. Press the [10's] key one time and the [1's] key four times to enter '14' in the LED Display, as if you were to make 14 copies.
  5. Press the green [Start] button.
  6. Press the pink [Clear] button two times.
  7. The WorkCentre should now warm up and come to ready.
  8. If the above steps do not clear the error code, repeat steps 3 to 6 a second time.

Posted on Jan 02, 2009

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  • 163 Answers

Please explain your question?

Posted on Jan 02, 2009

  • ronny2051 Jan 02, 2009

    follow the blow site may be help for u--

    http://agatis.biz/files/Xerox_Phaser_740...

  • ronny2051 Jan 02, 2009

    That is caused by the fuser. There is a solid aluminum roll and a silicon rubber ( pressure) roller in the fuser. The pressure roller either developes some flat spots from park ( non running) time and over time heat and use cause it to deform and become out of round. What then happens is when the paper enters the fuser it does so with a slight twist, and the pressure of the fuser, for lack of a better term, Irons in that crease during the fusing process.


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