Thanks automatic2. The diode is placed on a PCB with other components, and does not appear to be used for temp.comp. I haven't heard of this form of stability control. It would appear to increase drive level on current-increase heavy transients. I had decided to remove the component initially...
Thanks VE1BLL, I agree that Iout of pin 10 is limited, but it will still be enough to saturate Q2 and, I believe cause the problems. When FEC deliver spares, I can run some tests. At least you have a theory about CR5, which is more than I have. i will repost after some tests.
Thanks Alvey
Refer to astron linier PSU schematic:-
http://www.repeater-builder.com/astron/pdf/astron-rs50a-rs50m-rm50a-rm50m-1996-03.pdf
I aquired this broken 723 based PSU with blown components:-
CR1+2 35Amp diodes, 723 reg, q2, 3771 driver and diode CR5. I can easily repair, but cannot understand purpose...
