tens machine

[jellybean77]

I have a tens machine ( retail name circulation booster) thats used to treat nerve damage.
the power lead is 240v input to 5v output but i accidently plugged in a 9v output lead and it stopped working.
i opened it up and it seems i have burned out what looks like a resistor, It is green in colour and it has what looks like a gold band at one end and a brown band at the other.
The middle is badly burned so icannot make out the others.
I was going to try and get another one and have it soldered in but the guy who is going to do it says i need to get the part ?
Any help would be great.
Thanks in advance for any input.

 

[donkey]

those bands give us the resistance value. as shown above. to have a precise match we will need a pic and all 5 colour bands, all i can tell you at this point is it is either a resistor with a starting number 1(1k,10k, 0.1k.... unknown) with +/- 5% tolerance or if the end band is yellow not gold then the starting number is 4(once again don't know if its 4k, 0.4k) with a +/- 1% tolerance
sorry i can't help you more

 

[jellybean77]

I kind of thought that might be the case, Does it matter what colour the body of the resistor is or is it insignificant ?

 

[davenn]

do you have a multimeter ?
try measuring the resistor in and out of circuit
you may find altho it has got hot it may still be ok

Body colour is often used to indicate a type of resistor .... metal film, carbon, hi voltage etc


Dave

 

[jellybean77]

Thanks for the reply dave, tested it in and out of circuit and it doesent seem to have any resistance at all.

 

[davenn]

ok no prob

how about taking a very sharp closeup pic and see if us guys can help you identify the value

Dave

 

[jellybean77]

Here is a pic of the burned resistor

 

[markm6164]

This is a long shot but can you look around the board and try find another resistor matching the colours you have on this on? Manufactures like to reduce part counts as much as possible to reduce cost. Chances are that same value resistor is used somewhere else on the board.

 

[(*steve*)]

Could it be an inductor? WHat does the silk screen identify it as? R11, L2, etc...

 

[davenn]

yeah its definately an inductor

I would be trying a 100 uH one in there just as a trial, Its not going to do any harm
that would be brown black brown. We can see the first colour ( the one on the right is brown) the silver on the left is the tolerance = 10%

cheers
Dave

 

[jellybean77]

Thanks for the replies guys, I have just purchased som 100uh inductors online, when they get delivered i will try one out and let you know how it goes.