If you need the schematic, my email on my qrz page is good.Ĭlick to expand. Just like ok2zaw, if IC2 is bad, I will have to find another solution as I can't locate that chip. I'm getting 322 volts DC into the circuit so I believe that all of the circuits in the previous circuit is ok as well. I tested all of the other resistors and diodes in that circuit and they all tested good. I'll replace the 2 resistors and transistors and see what happens. I've ordered the K3505 replacement transistors and they are supposed to arrive on Monday. I believe what he is saying is that he is not getting a gate drive signal from IC2 driver. He does not state in his write up if he checked it or if it was bad. This is a 2.2ohm resistor feeding the gate of Q6. My R39 also looked fine but tested open as well. His R40 is fried but mine looked fine, however mine tested open (10Kohm).
#IC 7800 POWER SUPPLY OEM CRACK#
One transistor has a crack and is shorted on all 3 pins and the other is physically ok but shows open across all pins both directions. Mine has both Q7 and Q6 bad just the same as ok2zaw. I've found some errors in it but as far as the connections it has been accurate. It's not perfect but better than nothing. I did find another thread and sent an email and received a schematic from another ham.
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