[TechAssist] Re: Charging Circuit--Riobi 14.4 drill Charger
- From: "Warren C." <warrenca@xxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Thu, 23 Sep 2004 23:09:47 -0400
Gary
THe voltage in this charger is about 24-25 volts and the drill battery is a
14.4 and as
for the transistor
the white wire goes to the centre leg on this larger style of transistor which
usually
is the collector.
This transistor has a heatsink at the top (much larger than a 2222)
I would just like to beat the system and be able to fix this charger.
I also know that cheaper replacements are available.
Some day people will have 10 non working drills with just one small problem,
and one
new working one.
Thanks Gary
WC
Gary McCartney wrote:
> Warren, it sounds to me like the white wire is feeding into the base of
> a transistor, NPN my guess. See if one of the other legs of the device
> go to ground (emitter) and the last leg (collector) goes to B+ probably
> through a resistor. If you think it is a transistor, try a 2N2222. If
> the transistor does nothing, maybe it doesn't have enough gain. Try a
> NTE172A darlington. Do whatever with caution as you don't want problems
> such as over charging the battery, for safety sake.
>
> Gary McCartney
>
> McCartney Electronics
> Guelph Ontario Canada
> Est. 1984
> email: gary (at) number63.ca
>
> Warren C. wrote:
> > Are you suggesting that this three legged device in the charger is a
> > protector of
> > some kind?
> > A white wire leads to it. The other two wires are red and black of course.
> > When you test for vlotage at the battery itself to this third connector one
> > finds
> > that it is almost at
> > ground potential. It's so stupid when companys take the numbers off parts!!
> > This
> > ticks me off!!
> >
> > Warren C.
> >
> >
> > Roger G wrote:
> >
> >
> >>Third connector usually goes to a thermal protector or some kind of
> >>protector
> >>Roger G.
> >>
> >>Mr. Fix-It
> >>Harrisburg, PA 17110 WebSite- http://mrfixit.netfirms.com
> >>rogerfixit@xxxxxxxx
> >>FAX 510-740-3641; Tel: 717-763-7098 (shop) 717-652-1703(home)
> >>
> >>At 11:19 PM 9/22/2004, you wrote:
> >>
> >>>I hope no one minds this question.
> >>>Does anyone have a circuit diagram of this charging unit. The fast
> >>>charge light does not come on , only the other
> >>>two lights.
> >>>I also would like to know what the third connector on the battery is
> >>>for. When you follow this wire into the charger you come to an output
> >>>devise (transistor??) that has no numbers on it. (figures eah)
> >>>
> >>>My theory is that this devise may be bad and the drill batteries are
> >>>fine.
> >>>BTW the main (-) and (+) connections to the battery are on the left and
> >>>right side and they connect fine.
> >>>When you test for voltage in the charger at these two points you get a
> >>>reading of 24.6 V
> >>>
> >>>Can you help???
> >>>
> >>>TIA
> >>>
> >>>Warren Campbell
> >>>Campbell's TV & Appliances
> >>>Cannington ON
> >>>
> >>>
> >>>
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