Hey! My amp keeps.blowing fuses. I want to fix this...but where to start and how to test it....nothing looks wrong or blown...I'll be posting pictures. As soon as you turn it on it blows....

 

Welcome to AAC!

This is where you begin. You have to stop blowing fuses. You cannot trouble shoot an amplifier if the fuse keeps blowing.

1) Disconnect all speakers.
2) Disconnect all input devices and turn the volume control down to zero.
3) Wire up a house lamp test circuit as shown below. Plug the amplifier into the substitute outlet. Instead of the fuse blowing, the bulb will shine bright.
4) Get the circuit schematics of the amplifier.

 

Hi,
check two big power transistors, covered with grey silicone caps, fixed on the aluminum heatsink. And diode bridge, it's close to the two big electrolytic capacitors. Check with multimeter in diode test mode

 

Hi,
check two big power transistors, covered with grey silicone caps, fixed on the aluminum heatsink. And diode bridge, it's close to the two big electrolytic capacitors. Check with multimeter in diode test mode

Ok will do!

 

Looks like a switch mode psu, is it blowing the mains input fuses or speaker fuses?