hi! i have a problem with a faulty soundsteam d200, which i am trying to repair. the amplifier was in very bad condition and i tried to make it new again. I replaced all the bjt mpsa 42 and mpsa92 with new ones, the diodes in914 d1 d2 d3 d4, the tip 142 and tip 147 resistors and everything practically as new.
the amp turns on the pwm works the 36v duals are there, but at the base of the tips 142 tip 147 come -33v. so there is some problem that i am not able to understand usually there should be small positive values at the base of the power amps positive for npn and negative for pnp, and not -33v at the base of the power amps!
the only thing I can think of but it is not possible because they are the same in914 I supported them with in4148.
thank you very much
the amp turns on the pwm works the 36v duals are there, but at the base of the tips 142 tip 147 come -33v. so there is some problem that i am not able to understand usually there should be small positive values at the base of the power amps positive for npn and negative for pnp, and not -33v at the base of the power amps!
the only thing I can think of but it is not possible because they are the same in914 I supported them with in4148.
thank you very much
hello, then yes on both channels i have also procured the service of the d200, and i have reproduced on pcb as from service and also in that case i have the same problem on the basis of tip 142 and 147
I don't understand. Try a different translator (try several). Convert from your language to English and then back to your language to see which translator gets the closest to the original statement after the second translation.