I have an old Daiwa RS-200 12v 30a adjustable power supply that has been on the fritz for a few years. I decided it was time to repair the thing. This uses an op amp voltage regulator. It powers up but only outputs some 0.5v. The voltage regulator is not functioning. Voltage measurements at key points are correct (transformer and rectifier output). The vr board has 5v a/c. I already replaced the op amp but the problem remains. I took some additional measurements and found a problem at op amp pins 12/13/14. Pin 12 has the expected 7v but pin 13 measures 0. Pin 14, instead of having a specified 15v, has 27v. (Measurements at other op amp pins are appx normal, so I'm concentrating here). The 2sc1815 transistor is another story. Instead of 10v at the base I am measuring 1v. I have 28v at the collector, and also 28v at the emitter rather than the specified 15v. This kind of perplexes me as none of the reading make sense... where did all the base voltage go (there is 28v at pin 14) and why is the emitter voltage so high? Is it possible the transistor is shorted? I'll be grateful for any and all debugging advice and assistance!