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Brother MFC-420CN - dead

Discussion in 'Electronic Repair' started by WT, Mar 16, 2007.

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  1. WT

    WT Guest

    An older gentleman in our church had this multi-function printer and I
    told him I would look at it for him.

    The main symptom is that the unit is dead, as in push the little power
    button and nothing happens. My first thought was the power supply
    died, but it appears to be a very simple unit and putting out 31 vdc.
    I looked at the main board under the microscope and didn't see
    anything unusual. I checked esr on the electrolytic caps and did find
    the small ones like 100mf @ 10v varying quite a bit from cap to cap.
    Since this printer is only a couple years old and not used much, it
    seemed unlikey that the caps would already dry out enough to kill the
    machine, even though I got varied readings. No signs of cap leakage.

    Does anyone have any info on this machine? Has anyone run into this
    already? An internet search didn't come up with anything that
    helped. Thoughts? Thanks.

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