amr2
Well-Known Member
were you able to test the main board without the subs installed?
No, but I think the problem is the RC networks present at the VAS output. Without them, and two dummy resistors to load the feedback network, I think it should work
Do you mean the output transistors or power transistors?
Output transistors
Also, I am assuming you are doing one channel at the time.
Yes
You can work one channel at the time and the main board voltages should be good (given that nothing is wrong with the main board) you do not need both sub boards connected. One board is enough to load the PSU for both channels and the voltage on the main rails should not be wonky.
Yes, that's how I'm working.
on the sub-boards; when your pre-drivers an drivers got toasted last time, did you check that 1watt zenner right in front of them? That zenner most likely went kaput as well.
Yes, it's checked and it's no toasted. Anyway I put a new one. All components in the sub-board and the VAS section in the main board are checked. I'm overlooking something
Are you powering up with a DBT?
No