Beomaster 8000: Step Two - Rebuilding the Power Supply

In electronics you usually have three things, power supply, high current loads and small current signal circuits. The smoke typically occurs when high current loads go haywire and then overpower the supply. That is why in every Beomaster 8000 that crosses my bench I first rebuild the output amplifiers. They are the main power consumers in the 8000, and therefore have the 'means' to cause significant trouble. Once the load side is reasonably stable, it is time to make sure that the supply side is sound, too. Bad reservoir capacitors can cause short circuits, and that often leads to smoke, too. Another frequent issue with supplies is that poor reservoir caps cause significant ripple, which can cause hum or microcontroller malfunctions. So here we go: Step 2 - rebuilding the power supply:

This shows the power supply board in its original condition:

And after replacing all the electrolytic capacitors with 105C grade Japanese units:

I checked the reservoir caps, and it turned out that one was on the verge of going out of business. Its capacitance was less than 1/3 of its spec:

This means that the other caps are likely not far behind, and that replacing them is a necessary step for trouble free operation down the road. After this 'satisfying' measurement, I put the board back in:

The next step is to replace the main reservoir capacitors for the ±54V rails. And then the power end of things should be good again.