COMMUNITY FORUM

tack11

01:54PM | 10/03/08
Member Since: 10/02/08
3 lifetime posts
Bvtools
I have a Craftsman Charging Stand # 1421410 for 16.8 volt batteries that has burned out. Used when I bought it, it appears a prewvious owner opened it up and decided to install a full-wave bridge rectifier & filter capacitor inside as the input to the circuit board (between transformer and circuit board). Perhaps this was done to make it charge faster, since the built-in rectifier is half-wave, but for whatever reason, the large resistor (about 2 watts) and the small resistor for the LED (about 1/4 watt) are burned and I cannot read the color code. Could somepone please have a look at one of these units and tell me what the resistors are so that I can replace them? Thanks a lot

gmlupton

12:34PM | 11/01/08
Member Since: 10/31/08
1 lifetime posts
My charging stand is doing the same thing. Were you able to find a replacement changing stand? If so where did you purchase it from.

Thanks

George

electech

11:02AM | 01/21/09
Member Since: 01/04/09
5 lifetime posts
r2 = 220 ohms 1/4w 5%

r3 = 35 ohms 2w 5%

ntc( thermistor )( looks like a discap) can heat up and not allow battery to charge , shoting connection across ntc will allow battery to be charged( volt and current are strongly advised , or no more than an hour and a half)

electech

11:16AM | 01/21/09
Member Since: 01/04/09
5 lifetime posts
monitoring of voltage and current are strongly advised if you have to short the thermistor across. and or do not charge more than an hour and a half

tack11

02:33PM | 01/21/09
Member Since: 10/02/08
3 lifetime posts
Thanks for the data. If the thermistor was working as it should perhaps my charger wouldn't had burned to the point of opening the circuit in the manner it did. Would you happen to have the numbers off the thermistor too? Thanks

electech

11:05AM | 02/24/09
Member Since: 01/04/09
5 lifetime posts
tack ,

sorry , but I was mistaken on the R3 value , the first band looks like orange but it is actually brown , so R3 = 15 ohms not 35 ohms( I also measured it)( mine was 14.5 ohms)

the NTC thermistor = x72 , made in mexico

here is some pics

electech

11:11AM | 02/24/09
Member Since: 01/04/09
5 lifetime posts
ntc
2471-ntc

electech

11:26AM | 02/24/09
Member Since: 01/04/09
5 lifetime posts
uploading another pic , i'll be back later
2472-the_site_is_giving_m

tack11

12:04PM | 02/24/09
Member Since: 10/02/08
3 lifetime posts
I bought another charger stand on ebay. The thermistor in it is a Bourns R030. That'll make it a ressetable fuse, 60v, hold current 300ma, trip current 600ma
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