Question about Brother MFC 420CN All-In-One InkJet Printer

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Mag & Yel Ink don't work

My printer stopped printing mag & yel. The blu & blk work fine. I tried replacing the cartridge & have cleaned MANY times, but stil no mag or yel comes through.

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Replace ALL carts with new ones.

press menu then start bk-copy then fourtimes arrow up quickly one after another. machine turns to maintenance mode.
press 7 then 6 then 4 then start bk-copy.
machine will initiate the carts and refresh ink in tubes and ph and do some special power cleaning.

when finished press 7 then 6 then 3 then start bk copy.
machine will do a power cleaning.

when finished press 9 then 9 to leave maintenance mode.

run a test print.

If you cant see any yellow and/or magenta the ph is defective and needs replacing (this happens mostly because of generic ink which contains the wrong chemical mixture to keep the ph alive).

Posted on Mar 24, 2008

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Can you confirm that you are using a CIS or non-HP cartridges with this printer?

It sounds a lot like the printhead has reached a clogging point where sediment has built up in the black portion and loosens enough to printer a few lines before it re-asserts itself again.

Based on my experience of this printer, if you're using a non-HP delivery system for ink then you should consider replacing the black ink with a dyebase alternative instead of pigment.. Replacing the Black/Yellow printhead and running a number of test prints to purge the pigment ink in the printhead should then result in a clean and more reliable printout in future.

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