Another DD Z2B Stuck in protect

[netace]

If you use the 12V regulator that feeds Q81 as a reference to ground, I get 12V on pin #1 of the driver card. And that pin looks like it goes to the SD pin on the IR2184 IC. Q81 to me looks like its a part of the muting circuit. My Q81 was shorted upon my checking. Allow me to show you what I have traced and please please correct me if I'm wrong:

I'm powering the amp with 12V and its currently drawing 3.8A. The rail voltages are 162.5 and -162.5 and both are even.

starting from the top, everything referenced from the driver card ground (pin 9):

pin 1 - -101V - SD pin on IR2184 (12V) (Referenced from L7812FA)
pin 2 - -160.9V negative rail - looks like audio in (pwm on IR2184)
pin 3 - -161V - Low side output
pin 4 - -148.5V - Low-side and logic fixed supply on IR2184
pin 5 - 0V - ?
pin 6 - 0V - High side output
pin 7 - 10.9V - VS - high side floating supply return on IR2184
pin 8 - 0V - Output pins for TL072

pin 9 - GND
pin 10 - -15V
pin 11 - 0V (input pin) Pin 14 OUT from IC102. I'm assuming this is 15V when the IC gets replaced
pin 12 - -12V
pin 13 - 12V (had to replace this regulator. It was beside the -12V regulator)

 

[netace]

Oh, forgot to mention I'm also replacing the IC103, IC105, and IC106 so with these voltages its missing these IC's

 

[netace]

I'll be putting in parts in the amp I'm working on later on - I'm just comparing notes with this thread as I'm pretty well in the same spot as here.

As always I appreciate reading these threads and getting help when I need it from what looks like the smartest people in the amp repair business.

 

[Perry Babin]

When you have something like the voltages you posted and think they may be helpful, you can post them as you did here and then put a link to your thread in the other thread. That gives the information you think may be helpful, while keeping the repairs separate.

 

[netace]

I get what you’re saying. I’m not trying to break any rules, just trying to help others while helping myself.

As always, thanks for your much appreciated help and advice Perry.