Does the DBT check for shorts only in the power supply section or does it go beyond the power supply and check shorts in the power amp section?
The DBT indicates a high current draw by the amp. That current draw can be anywhere within the amp - power supply issue, shorted output transistors etc.
The DBT limits the current to help avoid smoke release, but won't tell you where the high current draw is taking place.
The DBT limits the current to help avoid smoke release, but won't tell you where the high current draw is taking place.
^^^^^^^^ THAT.
Then what´s the purpose? "I already know amp is bad" "Blowing fuses tell me so"
Difference is fuses blow in an instant, DBT shines and lets you take some voltage readings.
Say expected +/- 40V power rails now show +/-4V , or that DC voltage appears at speaker out, or upper transistors show 0V or 0.7V across them while lower ones show 7V (so upper ones lookn shorted, lower ones look good) , you can extract useful data from that.
Then what´s the purpose? "I already know amp is bad" "Blowing fuses tell me so"
Difference is fuses blow in an instant, DBT shines and lets you take some voltage readings.
Say expected +/- 40V power rails now show +/-4V , or that DC voltage appears at speaker out, or upper transistors show 0V or 0.7V across them while lower ones show 7V (so upper ones lookn shorted, lower ones look good) , you can extract useful data from that.