[TechAssist] Re: Charging Circuit--Riobi 14.4 drill Charger
- From: Gary McCartney <gary@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Thu, 23 Sep 2004 09:39:40 -0400
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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