Do you have drive to the PS FETs?
Scope on 10us and 20v/div and probe the center terminal of the FETs.
Scope on 10us and 20v/div and probe the center terminal of the FETs.
There are 4 - K3057 and 2 - F12C20C. The K3057 has +12.9v on all four middle pin, nothing on the 1st or 3rd. The F12C20C has -26v on the middle/2nd pin and 55.7vpp @ 30.4hz on 1st and 3rd pins with -944mv of ANJ ->-<- .The other has +26v on the middle/2nd pin of the F12C20C and 55.7vpp @ 30.4hz on 1st and 3rd with -944mv pin of AOO -<->- I can take pics if need be.
Man, I gotta slow down. One is F12C20C and the other is F12C20A I apologize for making this more difficult than it needs to be.
12.9v and a 24v waveform?
- rail on the center of one rectifier and + rail on the center of the other rectifier?
- rail on the center of one rectifier and + rail on the center of the other rectifier?
You can't get the 30ish v rail voltages on the center legs of the rectifiers with no waveforms on the center legs of the PS FETs or the outer legs of the rectifiers. Is it possible that the waveforms are being produces intermittently?
Does the voltage on the center legs of the rectifiers remain constant or do they drain off?
Does the voltage on the center legs of the rectifiers remain constant or do they drain off?
Im not seeing any wave forms, just the voltage numbers on the right side of my scope. Now the amp is randomly not powering up. Wow, this is crazy.
They remain constant. I pulled the one of the k3057's just to check as I did with all others and found no reading what so ever from pin 1 and 2 / 1and 3. 2 and 3 give me around .400 but 1 and 2 or 1 and 3 show nothing, now Im not 100% but I thought I would see something right?
I think there is still a problem with your scope.
If the voltage on the center legs of the output transistors is remaining constant, that would mean that the supply is still running.
What were you expecting to find with the PS FETs?
Connect your multimeter across pins 1 and 3 of the PS FETs. What is the DC voltage when you see a waveform on your scope and when that waveform stops being displayed on the scope?
If the voltage on the center legs of the output transistors is remaining constant, that would mean that the supply is still running.
What were you expecting to find with the PS FETs?
Connect your multimeter across pins 1 and 3 of the PS FETs. What is the DC voltage when you see a waveform on your scope and when that waveform stops being displayed on the scope?
I agree the scope does not seem to right. I dont have cash at the moment to get a new one so, I figured I could at least pull the fets and check them with my dmm. At this point I dont want to waste any more of your time with my scope not reading correctly.
Don't be concerned with my time, unless you have no interest in continuing.
The meter readings could let us know if it's a scope problem, or not.
The meter readings could let us know if it's a scope problem, or not.