The HP 8600A Problem has Returned

[Chris K]

Originally Posted by bandersen

Basically, you would remove the 723 and pass trandsistor.

7805 "IN" connects where the pass transistor collector was
"OUT" connects where the pass transistor emitter was

GND goes to ground

I'll give it a try. Thanks so much for the time and effort in detailing the instructions! It's very appreciated.

Couple of questions. What would be the problem solving strategy behind this replacement given the failure of the original and replacement 723? Is the 7805 more robust so whatever is damaging the 723 wont affect it or is the logic I just got a bad out of the box replacement 723 and I might as well replace it with something more modern and reliable? I have both on order so should I just replace the 723 again, give it some time, and if it fails go with the 7805? I know what I would do but I'm just checking if my thoughts align with what you are thinking.