Distorted output

[mnhiphop101]

I'm working on a generic Korean amp that uses a single ir2184 chip. With a signal driven into the amp and the gain low wave looks normal. Turning the gain up distorts only the bottom half of the wave. Any ideas what is causing this issue?

 

[Perry Babin]

You have two variables. Is the problem the gain or is it the output level that's the problem?

Leave the gain at one setting and change the level with the signal source.

 

[mnhiphop101]

I believe its the output level. No matter what I do it starts distorting around 28v

 

[mnhiphop101]

Working correctly it should go to about 180vac

 

[Perry Babin]

Post a good quality photo of the component side of the entire main board and the component side of any driver boards.

 

[mnhiphop101]

Here ya go

 

[Perry Babin]

Post a high resolution image of the area in the image below. I need to be able to read the component values and circuit board designations.

 

[mnhiphop101]

Is this better?

 

[Perry Babin]

Is there a TL074 designated as IC102 and with a 10 ohm resistor (R188) on pin 14?

 

[mnhiphop101]

Yes

 

[Perry Babin]

Is the audio clean on pin 14 of that TL074 (when the output is distorted)?

 

[mnhiphop101]

I'm not seeing any signal at all out of pin 14

 

[mnhiphop101]

I have 1 fet per bank in and and 1 fet is getting hot

 

[Perry Babin]

No audio on the pin driving R188? The diagram I'm using may not be the same.

What work has been done to the amp?

 

[mnhiphop101]

I have audio on pin 1 and yes it is distorted also

 

[mnhiphop101]

But it also distorts when I use the slave input.

 

[Perry Babin]

What work has been done to the amp?

 

[mnhiphop101]

New fets and drive transistors in the power supply and a new ir2184 along with new mc4452's in the output section

 

[Perry Babin]

Post the DC voltage on all header pins of the driver board. Copy and paste the following and fill in the blanks.


Pin 1:
Pin 2:
Pin 3:
Pin 4:
Pin 5:
Pin 6:
Pin 7:
Pin 8:



Pin 1:
Pin 2:
Pin 3:
Pin 4:
Pin 5:

 

[mnhiphop101]

Using the main ground?