Mtx ta92001 distorted output.

[Perry Babin]

What does the resistor read with your meter (out of the circuit)?

 

[kfx5050]

1.999kohmes

 

[Perry Babin]

What's the resistance from pin 3 of the 5534 to the negative speaker terminal (ground)?

 

[kfx5050]

Ne5534 the one close to led400 I have 3.000kohms . The ne5534 closest to the heat sink I have 10.04kohms

 

[kfx5050]

I was double-checking all the resistors in this area it seems that R4018 is open

 

[Perry Babin]

What's the resistance between terminals 2 and 3 of the heatsink 5534?

 

[kfx5050]

16.14 ohms

 

[Perry Babin]

Is that diode in front of those terminals shorted?

 

[kfx5050]

D402?

 

[Perry Babin]

Are you serious?

 

[kfx5050]

Don't understand what terminal you are referring to.

 

[Perry Babin]

It will need to be replaced. If R4111 is out of the amp, you can power up the amp to see what the rest of the drive circuit is doing. Did you replace the other resistor that you found open?

 

[kfx5050]

If your reference to the terminal of the 5534 op-amp this amp has a jfet in d402. If it's post to be a diode then maybe that's where the confusion is coming from.

 

[Perry Babin]

What are the markings on it?

 

[kfx5050]

P4HFA

 

[kfx5050]

It will need to be replaced. If R4111 is out of the amp, you can power up the amp to see what the rest of the drive circuit is doing. Did you replace the other resistor that you found open?

Yes that resistor is replace now.

 

[Perry Babin]

Aren't 2 of the terminals directly connected for D402?

Did it look like someone had replaced D402?

 

[kfx5050]

The d201 has marking 5h c. Is this the same diode that d402 (in front of the terminal 2&3 of ne5534) is post to have?

 

[kfx5050]

Yes two of the terminals are directly connected. Yes it appears to have been . One of the pads didn't look to be soldered very good.

 

[Perry Babin]

I have it marked D4 which would be a MMBD4148SE.