xtant x1001 led236 on no output

[kfx5050]

ne5532
red pro on ne5532 pins black on the ground input
2 -72.4
3 -72.5

 

[kfx5050]

pin 8 -60. with red pro on ne5532.

 

[Perry Babin]

I'm sorry but you're going to have to write more precisely. Complete sentences, clear descriptions. I'm not sure what you posted.

 

[kfx5050]

sorry the spell check on my phone keep changing the words.
1 -72.5
2 -72.5
3 -72.5
4 -72.5
5 -60
6 -72.3
7 -60
8 -60

all the reading are dc voltage. with the red test led on the pins 1-8 and the black test led on the ground.

 

[Perry Babin]

Was the black probe on the amp's main ground terminal?

Do all of the NE5532s have similar voltage readings?

Doing this on a computer would be much easier.

 

[kfx5050]

yes the black probe was on the amp's ground terminal
no 4 of ne5532 are showing pin 1 (-1.26) pine 2 (-2.68) pine 3 (-2.68) pine 4 (-2.68) pine 5 (1.26) pine 6 (-2.28) pin 7 (-1.84) pine 8 (-1.11). the other 4 ne5532 read pin 1-4 (-3.38) 5 (-2.26) and 6,7,8, (-1.68).

post #24 the reading are from ne5532 that is up buy the transistor near this two thick buss bar.

 

[Perry Babin]

If you're referring R281 and R282, those aren't bussbars, they're shunt resistors. The IC near them isn't an op-amp. It's a comparator. If it's an NE5532, it's the wrong IC. It should be an LM311.

It appears that the low voltage transformer isn't producing sufficient output. The transistor driving the transformer may be defective or it could be the driver IC. Without a scope, it's difficult to determine which is the problem.

There may be other problems as well.

 

[kfx5050]

what do the low voltage transformer look like? is it the yellow square by the speaker output? I don't mind replacing the driver IC its 8 of the looks like>to make shore I am under standing this right, Are the driver IC the ne5532 that are near the crossover area of the amp? my scoop should be in tomorrow or Friday.

 

[Perry Babin]

Yes. Yellow, square transformer.

The driver IC is the UC3845 near the transformer.

 

[kfx5050]

that yellow square transformer get slightly warem

 

[kfx5050]

what would be a good replacement for the yellow transformer?

 

[Perry Babin]

The transformers only VERY rarely fail. The problem is more likely a drive issue.

 

[kfx5050]

ok I replace the driver 3845A. amp played for 4 sec then the resistor r174 and r175 burn up. all so the smd cap right next to the acc port 1{right side of the acc port} on the amp is missing I believe I says c483. r175 and 174 are above the rca out put resistor.