Crossfire CFA30HC

[caraudioguy2100]

Anyone have any pics of the board ?

Or might be able to tell me the value of the resistors ?

 

[Perry Babin]

In the power supply, is that resistor between the primary and secondary grounds?

In the audio circuit, the photos I have, have the same resistor burned, but not as badly. I don't know if the multiplier band is reliable. Does it connect between the shield ground and the secondary ground?

 

[caraudioguy2100]

The resistor in the power supply connects between primary and secondary ground


The resistor that is burned connects to the shield ground of the rca and the secondary ground

 

[Perry Babin]

A 1k in the power supply should work.

The color bands in the photo I posted may be right.

 

[caraudioguy2100]

Back to this amp .

Replaced the resistors amp powers up and had audio but the left channel has very low output .

Any ideas on where to start looking ?

I cleaned all switches and it made no difference

 

[Perry Babin]

The preamp signal for both channels should be equal on the inter-board header. Are they equal?

 

[caraudioguy2100]

Yes they are equal

 

[Perry Babin]

What are the part numbers on Q131/231?

Does one terminal connect do the secondary ground?

 

[caraudioguy2100]

D1302

And yes one of its terminals connects to secondary ground

 

[Perry Babin]

Pull them and see if the channels equalize.

 

[caraudioguy2100]

Makes no difference still very low output

 

[Perry Babin]

Which terminal goes to ground? 1 or 2?

For the one that is NOT grounded, are the audio signals equal?

 

[caraudioguy2100]

Pin 2 goes to ground

The audio signal is not the same

 

[Perry Babin]

What's between the header where the signals are equal and that (muting) transistor, pin 1?

Is there a bad cap, an out of tolerance resistor or maybe a bad connection?

 

[caraudioguy2100]

I will check it out and post back