The story
A 20 kg heavy amp ended up in my living room. A guy living near me had had it for 10 years when suddenly one channel died and the problem was found to besome resistors going very hot. When he finally had gotten new resistors, he had ruined some of the Cu traces and this is where I enter the scene.
I had offered my help to tidy things up but when the poor owner missed the elevator in my house and had carried the amp, three stairs to my apartment there were some other issues to be addressed and just for fun (well ...
) I managed to short either a resistor or a diode.
The main issue is that (amp not hooked to a load) voltages to the power transistors as well as the driver stage is approx 10% higher than stated by the schematic.
To do
Replace the components I may have ruined. Tidy up the area and repair the traces. Replace the old 47uF/35V capacitors next to the transistors Q101/Q113. Screw the monster together.
Schematics and photos:
I have marked out "troubled areas and components".
Gclass-a100d3.pdf
PSU.pdf
This is where I have started. Next some close ups and discussions about the high voltages and excessive heat. But if anyone has some experience with this amp, I will led at least two ears.
A 20 kg heavy amp ended up in my living room. A guy living near me had had it for 10 years when suddenly one channel died and the problem was found to besome resistors going very hot. When he finally had gotten new resistors, he had ruined some of the Cu traces and this is where I enter the scene.
I had offered my help to tidy things up but when the poor owner missed the elevator in my house and had carried the amp, three stairs to my apartment there were some other issues to be addressed and just for fun (well ...

The main issue is that (amp not hooked to a load) voltages to the power transistors as well as the driver stage is approx 10% higher than stated by the schematic.
To do
Replace the components I may have ruined. Tidy up the area and repair the traces. Replace the old 47uF/35V capacitors next to the transistors Q101/Q113. Screw the monster together.
Schematics and photos:
I have marked out "troubled areas and components".
Gclass-a100d3.pdf
PSU.pdf
This is where I have started. Next some close ups and discussions about the high voltages and excessive heat. But if anyone has some experience with this amp, I will led at least two ears.