Chosen Solution
Hi! I have a Dual CV 3530 220V 50Hz amplifier with STK chip attached to a giant heat sink in it. I’am in Europe. It doesn’t make any sound when connected to the speakers. I tried to connect headphones but they blow up immediately. I tested things like : -solder reflow -cleaning the main volume potentiometer No components seem to be blown, the main fuse is not melted and I don’t know what to do next. I don’t know if the speakers are blown, but they seem a bit sticky. PS: The only thing I found online is a guy who sold one once in Russia, so no schematic…
The first thing to look for is capacitors that have “domed” or are bulging at the top. A brown substance may, in extreme cases, leak out from them. Replace any of these with capacitor with same specifications which are easily read on the side of its case. I fixed a NAD C352 amplifier by replacing the main power boards 2 large capacitors which had “domed”.
STK chip attached to a giant heat sink may be out. You might consider replacing it. CAUTION: If you decide to take this on yourself unplug the unit from the wall and discharge the capacitors. Beware of LETHAL HIGH VOLTAGES. The can kill you.
