Rockford T500-2bd help.

[Perry Babin]

Is it component cooler or is is canned compressed air?

 

[rhempz01]

Just compressed air but I order component cooler.

 

[Perry Babin]

You will have to invert the compressed air can. After replacing the resistors that burned, you will drip the compressed air onto all of the ICs in the class D section until they frost over. Power the amp up for as long as you can without the resistors burning. Do you see any IC that defrosts more quickly than the others?

 

[nigelsook]

perry could you pm me the fet numbers for fet 260 and fet 471 for a mtx 8100d please

 

[rhempz01]

You should start a thread under the car audio section with your amplifier model number and your question. He will respond there.

 

[rhempz01]

Perry I couldn't really notice a difference of the two in thawing out I ordered the component freeze tho should be here monday. It wasn't easy with the compressed air. Should I replace them both, I have them in stock?

 

[rhempz01]

The 393's perry or the 072's the ones closest to the transformers are a different chip can they be switched to 072's? /I have them in stack as well.

 

[Perry Babin]

Do you have the correct voltage on the various regulator transistors?

Q201, 202, 17 and 18

 

[rhempz01]

The resistor burned out again. Do you know the part number for the soic8 721m the isolators?

 

[rhempz01]

Still trying to figure out which one is bad perr y I got all new led for the board, installed them. I tried finding which one of the isolators was bad using your freeze method. I am still burning out the resistor. I have changed u200, u203, same result. Am I looking at the wrong part perry?

 

[rhempz01]

The protection nor thermal led lights up, only the blue power led, I do not know what voltage I'm looking for on those transistors, however there very low m.v except q202 pin 1 6.12v

 

[rhempz01]

The transistors have this on them black to ground,
Pin 1-2-3 q201(1) 1.0mv. (2)-17.49v (3)-6.07v
Q202(1) 1.0mv (2).604v (3)
Q17 (1)5.2mv (2).6v (3)133.3mv
Q18 (1)5.2mv (2).6v (3)133.2mv

 

[rhempz01]

I believe d201 is burnt out, anyone know what transistor belongs here?

 

[Hexhclass]

D20l is not a transistor.

 

[rhempz01]

Diode, I found it from the other side. It's ordered but I just used the same diode of another type for now. 6.8v

 

[rhempz01]

I stopped the resistor from burning out and now have q202 -6.72v
q201 6.73v
Q17 11.7v
q18 11.7v

 

[rhempz01]

Just no audio? I could use some help on this?

 

[rhempz01]

Perry if have a min I could really use some help. The amp is still not functioning properly. It powers up, R90, R89 get hot, and there is like a buzzingv sound coming from the amp.......not sure what it is, can't pinpoint it.

 

[rhempz01]

The amp makes the strangest noise, a high pitch wine that alternernated when I move gain up and down, seems like it's from the torrid converter?

 

[rhempz01]

Part # for these? And do they go bad. Makes a strange winding noise.