Another ir2184 base amp

[Hexhclass]

The amp is going in protect.I could not find any fault so i disable the two driver ICs.By mistake instead of bridging pins 2 and 3 I bridge pins 1 and 2.Now amp is out of protect.
What does that indicate?
What should i check when it is in that state?

 

[Perry Babin]

I can't say what that means since I've never tried it.

Remove bridges and make sure that amp acts as it did before. Then short 2-3 and check the signal up to the IC if the amp no longer goes into protect with the 2-3 short.

 

[Hexhclass]

I see no signal on pin one of the ICs

 

[Perry Babin]

Did you jump 2-3 for both ICs?

Do you have signal coming into the driver board?

 

[Hexhclass]

Yes,I did that to both ICs
Amp is out of protect,I will now check if signal is coming in.Do you no on which pin I should check?

 

[Perry Babin]

Solder a 10k resistor bgetween pins 1 and 2 of U3. When you drive a signal into the amp, you should have signal on pin 1.

On U4, you should see a square wave on pin 7.

You should also have a 10v square wave riding on the negative rail on pin 1 of the driver ICs.

 

[Hexhclass]

I install the resistor but did not see signal at these points.With signal and no signal that's what i see on pin 1



.5dv/20us

 

[Perry Babin]

Pin 1 of what component?

What does the signal look like on the input pin of the driver board?

 

[Hexhclass]

That was pin 1 of the driver board

 

[Perry Babin]

That's a driver output.

Check signal on pin 1 of the TL072 and pin 7 of the LM211.

 

[Hexhclass]

Am seeing the same signal previously posted on these pins
Should there be positive rail voltage going to the driver board?

 

[Perry Babin]

Do you have a clean sine wave coming out of the preamp section?

 

[Hexhclass]

I went back to this amp science i have two with the same driver board and similar problem.

I did not see a sine wave.I saw a square wave from the preamp section going to the driver board.

 

[Perry Babin]

Turn the signal level down. Does that give you a sine wave?

 

[Hexhclass]

Yes I see a sine Wave.

 

[Perry Babin]

Answer qthe questions here:
Another ir2184 base amp

 

[Hexhclass]

Thats the same amp.

Should i disable the ICs and connect the 10k ohm resistor and check for signal again?

 

[Hexhclass]

I see signal on pin 1 of the 072.The bottom clips before the top if I increase the signal.I see a square wave on pin7 of U4.The scope does not lock on the signal but I can clearly see the square wave.on pin one of the driver ICs I see a square wave but they not identical with same scope setting.

 

[Hexhclass]

Would that indicate the driver ICs have fail?

 

[Perry Babin]

When checked as shown below, do you get very similar readings from all driver ICs?