There are a total of 24 outputs in the amp .
Where the 3rd leg of the output connects to the output filter inductor I bet good drive signal .
On the other outputs where the middle leg connects to the output filter inductor I bet no drive signal on the the trace just goes to the bottom of the display
Where the 3rd leg of the output connects to the output filter inductor I bet good drive signal .
On the other outputs where the middle leg connects to the output filter inductor I bet no drive signal on the the trace just goes to the bottom of the display
The 3rd leg of the outputs driving the inductor are the high-side FETs.
The middle leg of the low-side FETs connects directly to the inductor. Even if there was no low-side drive, you would have a signal on the middle leg of the low-side FETs.
Also, you can' have r-r drive without the low-side FETs being driven.
The middle leg of the low-side FETs connects directly to the inductor. Even if there was no low-side drive, you would have a signal on the middle leg of the low-side FETs.
Also, you can' have r-r drive without the low-side FETs being driven.
I will post back tomorrow. I pulled the output section out of the heatsink to check things over and test components to see if I can find anything defective or out of spec and then put it back together and test further .
Now I have to track the the next problem down why I’m getting 13 volts on the heatsink and when I remove the clips the voltage climbs then drops out wondering why I have power on the heatsink at all
When you have 13v and ground it through the limiter, does it drain off without drawing any more current?
I noticed the amp will start drawing more current . And when the amp is first powered up the current draw bounces around then finally stabilizes
I think I figured it out . At one point in time who ever repaired it nicked up the heatsink behind the spring clamps and there were sharp edges poking through the sill pad and creating contact with the back of the fets .
Also with only one rca ground shield open as seen in post 25 and the other one intact could that cause the noise issue the amp was having ?
Also with only one rca ground shield open as seen in post 25 and the other one intact could that cause the noise issue the amp was having ?
I don't think the bad ground could have caused the problem if the noise was present without RCAs plugged in. It would be the same as having no RCAs connected.
When the heatsink gets damaged like this, it's generally best to wetsand with 400 grit paper using long strokes until perfectly level.
When the heatsink gets damaged like this, it's generally best to wetsand with 400 grit paper using long strokes until perfectly level.
Since there was a few power supply fets making contact with the heatsink there is also a ground wire that connects to the heatsink that suppose to eliminate noise . Would that cause the issue I was having since there is a ground wire to the heatsink and the fets making contact with the sink ?
It could depend on where the ground wire connected in the circuit.
Do you have the noise with the amp out of the heatsink?
Does the amp produce normal audio out of the heatsink?
Do you have the noise with the amp out of the heatsink?
Does the amp produce normal audio out of the heatsink?
I put it back together and the noise is gone after sanding the heatsink behind the fets and installing new thermal pad