Earthquake PH2000w/D1

imraneesa · 2023-04-11 5:24 pm

Amp has 45v on the speaker terminal. Removing Q20, voltage reached to around 1v on speaker terminals.

Perry Babin · 2023-04-11 7:01 pm

What is the purpose of Q20?

What diagram are you using?

imraneesa · 2023-04-11 7:27 pm

I dont have any diagram. I just saw in some old post you was asking about lifting Q20. So I tried it.

Perry Babin · 2023-04-11 7:34 pm

Working link to the post/thread?

imraneesa · 2023-04-11 7:39 pm

Perry Babin · 2023-04-11 7:47 pm

Does this match your amp?

imraneesa · 2023-04-11 8:29 pm

Yes matching. But I still can't find the problem.

Perry Babin · 2023-04-11 8:39 pm

One step at a time.

Pulling Q20 disabled the output stage.

If you drive signal into the amp, do you get clean audio up to IC% pin 1?

imraneesa · 2023-04-11 9:07 pm

I have signal upto R44 after that IC5 pin 7 has top portion of sinewave missing. And IC5 pin 1 has no signal.

Perry Babin · 2023-04-11 9:15 pm

DCV on all terminals of IC5:

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

imraneesa · 2023-04-11 9:54 pm

Positive voltage was missing. I found the problem. Thank you Sir.