[TechAssist] Re: Charging Circuit--Riobi 14.4 drill Charger
- From: Edward Gaidies <teltek3@xxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Fri, 24 Sep 2004 06:21:56 -0400
Hey Warren;
Make sure you buy the same drill each time..then you will have lots of
spare parts.;-)
Problem is...will probably always be the same part that's gone.
-Ed-
*****************************************************************
Ed Gaidies
Tel-Tek Electronics
Ontario-Canada
teltek3@xxxxxxxxxxxx
On 23-Sep-04, at 11:09 PM, Warren C. wrote:
> 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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