Question about Brother MFC-640CW All-In-One InkJet Printer

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How to replace the printhead? Or should I?

My MFC-640CW was wonderful until it quit printing in red and yellow. May have been the cheap ink I was using. I went through many cleaning cycles to no avail. I bought some cleaning solution and made up some dummy ink cartridges with it, but many more cycles yielded no improvement, and the printer finally gave the "unable to clean" call. So, I figured the print head was beyond repair. I bought another broken MFC-640 on eBay with the intention of swapping printheads. This one won't feed paper and cries "paper jam". So, here's my question: which one should I try to save? Would it be easier to swap printheads and fix my original printer, or salvage my printer to fix the gear problem in the other printer?
I'd be inclined to do the printhead swap if it's not difficult, as at least I know the history of my printer. But how does one swap printheads?

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  • johnmbla Dec 11, 2007

    Hello. Here's what happens: the printer starts up, makes noise, sound like it tries to suck a piece of paper in then says, "paper jam". From there, I pressed MENU, then Black Start, then hit the up arrow on the silver jog dial 4x. The message center button, along with the four function buttons, all started blinking and the display says "Paper Jam. Open back cover then remove paper jam." It sounds like it should be moving paper when it tries, but the rubber roller that sits on top of the paper stack doesn't turn. Is that what you were asking?
    Thanks, John

  • johnmbla Dec 12, 2007

    okay. I got to a screen that said MACHINE ERR_1:84. Pressing the Menu key showed 2:84, 3:84, 4:84, 5:84, 6:84, 7:A1, 8:84, 9:84.

    In case you're interested, I did it with my original machine, too. Here's what it did: 1:46, 2:46, 3:46, 4:46, 5:46, 6:46, 7:46, 8:46, 9:A1.

    I'm sure glad you know what these mean, because they're Greek to me!

  • johnmbla Dec 12, 2007

    Interesting, thanks. So, what do you suggest? Swap the printhead and absorber from the code 84 one to the code 46 one? How do I swap the printhead?



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Firstly, yes the cheap ink has KILLED your ph! The missing of some important additives in the ink get you there. Saty away from generic ink carts!!!! Do refill the original brother ones with a reliable and good DYE ink.

To get it clear what error code does the eBay one give to you after pressing menu then start bk copy then 4x arrow-up?

Plz post it here. (might save our both time and energy).

Posted on Dec 10, 2007

  • Mix-it-up
    Mix-it-up Dec 11, 2007

    OK John. When all lights are flashing plz press 8 then zero then several times BK start (copy) until LCD shows error_XX (e. g. A1 or 84 or something else) Plz write down error code. Press menu to switch to the next recorded error code. Do that 9 times and write it down. press stop then 9 then 9 to leave the maintenance mode.

    Plz post codes here again.

  • Mix-it-up
    Mix-it-up Dec 12, 2007

    A1 is simply COVER OPEN / PLZ CLOSE COVER (tis actually no error)

    Error 46: You need a new waist ink absorber which you can buy for a few bugs from a service partner near your home (search brother homepage). When you have this spare part you have change the absorber by opening the printer and to do a eeprom reset by pressing menu then start bk copy then 4x arrow up. press 8 then zero then several times start bk copy until you reach PURGE 66XX (where x is a no.). Now press 2 then 7 then 8 then 3: PURGE 0000. Press stop then 9 then 9 to leave mode. thats it!



    Error 84 this is related to a broken gear wheel or a stained encoder disc (the round foil on one of the 3 big gear wheels) or a broken clutching gear which is shifted by ph (when reaching the park position on right side : white small plastic coming out of metal).



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if your print head is removable (the thing your ink cartridge clips into) remove it and clean it out with asorbic alcohol on both the print face and the ink inlet area- If your yellow has been empty for a while before you bought a new cartridge, it is possible that ink has dried in the ink channels of the print head and this is almost impossible to repair and you would be better off buying a new print head- Also if you have a fairly new printer you can contact the manufacturer about your issue and they may or may not send you one for free- My KodaK AIO had the same issue and Kodak replaced the print head for free all I had to do was take the time to call them

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DO NOT remove the ph!

What you can do is to run the initial set-up for carts:

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Press menue then start b/k cpoy then fourtimes arrow up. machine turns to maintenance mode. press 7 then 6 then 4 then start b/k copy. machine initializes the carts and do some very special cleaning. When finished press 7 then 6 then 3 then start bk copy. Machine runs an exrta power cleaning. press 0 (Zero) then 9 to print a test print.

If your lucky the cheap ink hasnt affected the ph nozzels.

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Buy a new waist ink tank as a spare part from a service partner near your home who can be found at the brother homepage of your country.
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You have to do a reset within the eeprom. When you ve bought the new ink absorber plz post here again. Will give you the code then.

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