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Problem with potentiometer in a dimmer switch

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sutapanaki

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I have a problem with the dimmer switch for my halogen room lamp. It has a ST BTA12-400C triac and works for 120v 60Hz 500W 4.3A.
I think it is the potentiometer that's giving problems, but it has no markings so I can't understand what type it is or what's the resistance. I tried to measure it, but it is not giving results I can trust. I also measured the triac and it seems to be ok. If someone has more experience with these things, please, let me know approximately what values are used for the potentiometer in such kind of switches.
BTW, the producer is a company called Japen international, but I couldn't find anything about it on the net. May be it doesn't exist anymore, because the switch itself is prety old.
 

dimmer switch triac

hi
i worked on it previously, use a conventional ordinary potentiometer its ratings will be in watt.u can measeure the resistance between any 2 points (it has 2 points all together of which 2 should be shorted ok).the triac ur using is ok place this triac on a heat sink and in between tric and heatsink apply cooling agent .be care ful for choosing switch ratings and all.if u have more doubt u can mail me with ur circuit and complete details my id id janakiram.sistla@rediffmail.com
 

japen

BEFORE YOU GET WRAPPED AROUND YOURSELF WITH ANGST AND ANGER, GO TO ACE HARDWARE AND GET AN "ACE LIGHT DIMMER REPLACEMENT 3190584." IT WILL TAKE YOU AROUND $4 AND 10 MINUTES TO BE OVER THE TRAMA OF DARKNESS.
 

dimmer with bta12

sutapanaki said:
I also measured the triac and it seems to be ok.

How exactly did you 'measure' the Triac?

Just putting an ohmeter or multimeter on it is very unreliable. You have to check if it latches and hold the latch when you disengage the gate.

**broken link removed**
 

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