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Re: Resistor and triac failure - how to read

Subject: Re: Resistor and triac failure - how to read
Date: 7 Dec 2006 03:39:23 -0800
Newsgroups: sci.electronics.misc
Homer J Simpson wrote:
> <[email protected]> wrote in message
> news:[email protected]
> > My wife brought home a flat iron, used for straightening hair, from a
> > woman she works with.  It would turn on, but not get hot.  I opened it
> > up and discovered that a resistor (one lead blown off the board) and a
> > triac (case had a chunk missing) had failed.
> > Questions:
> > What would have had to happen to cause this?
> > What likely failed first?  Did the resistor fail, causing the triac to
> > fail, or vice versa?
> Vice versa.
> > The resistor is tiny, about 6mm x 3mm, and the 5 color bands are very
> > hard to read.  My DMM reads 1.2 Mohm.  Is the reading from a failed
> > resistor accurate enough to get a replacement?  If you had a resistor
> > that you couldn't read the color bands on, how would you replace it?
> I would guess. It's not hard to experiment on.

Thanks, Homer.  How would I know if I have it right, other than the
thing doesn't pop when I plug it in?  What are the dangers of
installing a resistor that is too big or too small?

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