Thanks Peter, Now that you mention it, I have heard that these triacs get used in the auto voltage detection. I was about to reverse engineer the schematic and that is now my next step. I would still like to identify possible replacements though in case I ever need spares for this part.
Regards Rob > -----Original Message----- > From: cctalk [mailto:[email protected]] On Behalf Of Peter > Coghlan via cctalk > Sent: 17 December 2017 13:25 > To: [email protected] > Subject: Re: BT139-600G Triac Equivalent > > > > > I have a suspicion that this component may be faulty on the input side > > of my > > H7826 PSU. A little tester I have does not recognise it, it is > > possible that the currents it uses are too low for this particular > > triac, but I am not sure. > > > > What is the function of this triac in your power supply? > > I have come across a triac which is used to switch between 115V and 230V > input in the PSU of a DEC 3000/300. My triac went short circuit which caused > some release of magic smoke when the PSU was used on 230V. I also had > difficulty finding a replacement for it so I ended up leaving it out. The PSU > worked fine on 230V only without it once I replaced the other damaged > components. > > If your triac has a different function, ignore the above. > > Regards, > Peter Coghlan.
