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Re: SC503 -12V power supply


 

Ozan,

I found a broken trace which I repaired.

I also swapped out a few transistors.

Today I am measuring -0.48 volts when I short across C-E of Q8051.

I understand that 2N2222A is a lower wattage equivalent to the 2N2219. I have ordered additional 2N2219. The 2N2219 was/is shorted.

There is a .3VPP oscillation at the base of Q7042. a 50mv ripple on the +12V and a .2V ripple on the -33.5V.

I am still plugging away at it.

Thank you!

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