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Where to start looking

beta22

Where to start looking

Postby peterotto » January 5th, 2019, 2:23 pm

My B22 just quit one day.

I measured the voltage across R9 and it was no where near 4.5V. Turning VR1 didn't help much either. VR1 measured correctly 208 Ohms. So something fried.

By the looks of things, I see no brown spots.

Who are the usual suspects for this?

Thanks
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Where to start looking

Postby amb » January 6th, 2019, 8:14 am

First off, check your power supply output voltages.

Then, check the DC voltage across D11. It should be less than a couple of volts. If it’s greater, replace Q25. Do a similar thing for D12 and Q26.
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