Darin Miller Posted May 18, 2008 Share Posted May 18, 2008 Howdy, I purchased a few used CTB16D controllers and found one of the controllers with a single channel not functioning. All of the pigtails, powerblocks and traces are good. I checked the voltage right on the leftmost pin of the TO-220 Triac and found 0 VAC. All the remaining Triacs had good voltage with all channels turned to "ON" in the hardware utility. My question: Are there any other signals I could check upstream of the Triac in order to isolate this part as the failure? If I have a bad Triac, then I may just need the NTE part number. We have a local shop that sells all NTE electronics and I could get it replaced quickly.Thanks-Darin Link to comment Share on other sites More sharing options...
cmoore60 Posted May 19, 2008 Share Posted May 19, 2008 Darin,I am not at one of my boards to look. I assume the leftmost pin is the output pin of the Triac. The other component that could be effected is the Opto. I believe the Opto gates the Triac on the center pin. So you would need to see if you have 120 vac coming from the opto.Keep us posted!Chuck Link to comment Share on other sites More sharing options...
grandlakedad Posted May 19, 2008 Share Posted May 19, 2008 Triac: Mfr. STMICROELECTRONICS, Part #BTA16-600BWRGOpto, Mfr. FAIRCHILD, Part #MOC3023-MYour local shop should be able to cross reference the part numbers to an NTN number. Link to comment Share on other sites More sharing options...
Dr. Jones Posted May 19, 2008 Share Posted May 19, 2008 I would be a little suspicious of the triac failing. I have lost more optos than triacs.Contact Dan - they will send you replacement parts Link to comment Share on other sites More sharing options...
Dennis Cherry Posted May 19, 2008 Share Posted May 19, 2008 Did you check if the opto was installed backwards? Link to comment Share on other sites More sharing options...
Darin Miller Posted May 19, 2008 Author Share Posted May 19, 2008 Dennis Cherry wrote: Did you check if the opto was installed backwards?This was a previously working unit and the opto is in correct. I guess I'm kind of stuck so maybe I should start with the opto and then move to the Triac.Thanks for the advice Link to comment Share on other sites More sharing options...
LightORamaDan Posted May 20, 2008 Share Posted May 20, 2008 If you need a part then just send a note to support@lightorama.comDan Link to comment Share on other sites More sharing options...
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