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

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Unable to turn on

My printer is always on but the other day it shut off somehow and now it will not turn on at all. any suggestions?

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Common error on older brother printers:

defective capacitor! The whole main printer board needs replacing. Its cheaper to buy a new mfc!

Posted on May 14, 2008

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If the printer shows no LEDs at all, it is likely that the power supply has failed.
About the only thing you can do is to disconnect it from your system and AC too.
Let it sit for at least hours, days would be better if you can sacrifice it that long.

If it comes back after a long rest and then drops out again without cause, then (if it is a 'nonlinear' or switching supply, most are now) a relatively cheap part in the supply (a capacitor) has failed.

Unfortunately, while the part is cheap, the labor will probably make the repair more costly than a replacement would be.
Locating the capacitor requires some knowledge of the innards of the unit and a meter capable of measuring the two critical parameters of the capacitor.

Posted on May 14, 2008

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