American Bass CX-1200-D

mike49504

Member
2006-09-22 8:32 am
Ill just order the originals from mouser .

Next question is The power supply in this amp was totally shot.

The outputs all test good . Does the class d board go bad if the power supply burnt up or generaly only if the outputs failed?

The class D board in this amp I believe is unrepairable if it goes bad.
 

mike49504

Member
2006-09-22 8:32 am
Ok I replaced the power supply fets with the originals. Also replaced the drivers and gate resistors And a couple caps and a few other resistors in the supply.


If i try to power the amp up no light come on but i can hear the relay kick on.

Amp has 1.0 volts on leg 1 of the power supply fet and 13.5 on middle leg.

AMp does not produce rail or regulated voltage.

Wondering where i go from here?
 

mike49504

Member
2006-09-22 8:32 am
Ok i dont get this amp.

In the Pics there is a spot for a 47 ohm resistor right now i have it removed.

As soon as i apply power and ground no remote the resistor smokes within 1 sec

I pulled the driver boards for the power supply and it still smokes within a sec.

1 side of the resistor connects to a 47 uf 25 volts cap

the other side connects first to the 22 ohms resistor in the pic then goes to a diode which tests fine then goes to the relay.

If i measure across tthe pads of the 477 ohm resistor i get 13.92 volts on the pads.

Wondering what might cause this resistor to smoke within 1 sec?
 

mike49504

Member
2006-09-22 8:32 am
Duh

Heres the pics
 

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mike49504

Member
2006-09-22 8:32 am
Didnt notice it til now someone at one point removed the caps from the class D board.

Anyone know what value caps theese are?? the ones circled they are white

Also anyone know what relay goes in this amp since the cover to the one that in it is missing?
 

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