Alpine MRV-F352

[caraudioguy2100]

Amp powers up and plays audio but I have to have the gains maxed out on all channels in order to hear audio .


I’m getting rail and regulated voltages .


Any ideas ?

 

[Perry Babin]

Have you operated all pots and switches through their entire range while listening for audio to see if it every played through (even just for an instant)?

 

[caraudioguy2100]

Yes no difference

 

[Perry Babin]

What is the DC voltage on all terminals of Q302?

 

[caraudioguy2100]

Leg 1:0.00
Leg 2:0.00
Leg 3:-4.61

 

[Perry Babin]

The audio is low, but is it also perfectly clean?

If you drive a strong signal into it, what is the AC (not DC) voltage on the emitter leg of each of the muting transistors (Q302-Q306)?

 

[caraudioguy2100]

Yes clean audio but low output

Emitter leg pin 1

0.35 volts on all of them 301,302,303,304,305,306

 

[Perry Babin]

Have you pulled one of the muting transistors to see if audio would pass?

 

[caraudioguy2100]

Not yet