Re: Repair Oral B 3D Pulsating Toothbrush

On Fri, 1 Aug 2008 01:13:05 +0100, "Martin Whybrow"
<aholeintheground@xxxxxxxxxxxx> wrote:


I recently took a similar unit apart, the charger post engages in the base
of the toothbrush and can be used to twist the bottom of the unit off and
the guts then slide out. Mine had an O ring seal so it would, theoretically,
be possible to reassemble it;

Yes - my wife's OralB toothbrush has stopped working a couple of times and this
is how it opens. The main problem is corrosion. It has suffered a corroded main
pcb track (along the edge of the pcb)to the power FET - replaced with wire link.
Also corroded through charging coil wire at the pcb solder pad. I think the
charging coil wires were short to begin with but I was able to get some extra
length (forget how) so that it now opens without breaking them.
I sprayed the pcb with varnish a couple of years ago but it has recently been
playing up again so will have to dismantle again soon.
Couple of 74 series chips LV00 and LV4060. The timer stopped working so
suspecting leakage/corrosion again.


Geo
.

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