Reply to "Failed Sound Chip on 5V Board?"

Vernon BarryOGR Forum Member SUPPORTING MEMBERDIGITAL SUBSCRIBER

@Rod Stewart posted:
Sorry, I meant which board component on the master PS-2 board actually triggers the F coupler? The trailing A unit slave board would have a similar device for the R coupler presumably.

So basically right there where you wanted to replace the audio amplifier.

https://ogrforum.com/topic/192...1#192886122952331501

Credit to George- GGG

Here is the PS-2 5V coupler Transistor (Not FET). It sits behind the audio chip on top of the processor board. The top power section is removed along with other components. You can clearly see the traces from pin 8/9 of the 12 pin going to legs 5/6 and 7/8 of the transistor.

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