Does anyone know what resistors and assorted components belong in this area? Is there a way to bypass this circuit? It's pretty burnt but if someone has a photo on this area top and bottom I can rebuild this circuit.
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Your don't by chance have the underside picture of this circuit? From post #6 there are a few burnt connections I think are wrong.
I tried to use mspa06-56 for drivers and the drive signal came out like this.
Is there a better sub for the 2sa1266 pnp and the 2sc3198 npn?
Is there a better sub for the 2sa1266 pnp and the 2sc3198 npn?
For now I have made the nessasary connections. Changed all the LED's they were all bad. So now I have the power supply repaired I found some 2sa1266 and 2sc1398 transistors for the drivers. The power supply is stable.
Moving on. I will make repairs to the trace and board later with epoxy.
The relay does not engadge,? Is this normal?
Moving on. I will make repairs to the trace and board later with epoxy.
The relay does not engadge,? Is this normal?
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Is the output stage working before the relay?
You need to get into the habit of cleaning the board (top and bottom) when doing any work.
You need to get into the habit of cleaning the board (top and bottom) when doing any work.
No it's burnt badly there as well. I cleaned it a up and when you power up the amp it burns between gate and source, the PCB has likely become conductive. When I first installed new 9640's and 31n20, actual flames shot off the board and shorted the n channel transistors.
The board is as clean as I can get it. It was corroded and burnt badly. I think like oil got in it somehow.
I use a 99% iso alcohol to clean them.
This one is very bad.
The board is as clean as I can get it. It was corroded and burnt badly. I think like oil got in it somehow.
I use a 99% iso alcohol to clean them.
This one is very bad.
I'm sorry but the board is filthy where there was no burning. Some people leave boards like this. I try to encourage better cleaning. Sometimes problems are caused simply by flux that is so dirty/contaminated that it becomes conductive. Areas of the board that are in contact with traces or components has to be removed completely to the point that nothing is left but clean fiberglass.
Oh see yes I clean up all flux constantly. Even some boards have it from the factory hifonics especially. Thick. Noted.
Ok so I dug all the burnt fiberglass out. I think it was the alcohol that caught fire soaked into the burnt pcb. I dug it out and am working on the drive for the outputs.
Ok so I dug all the burnt fiberglass out. I think it was the alcohol that caught fire soaked into the burnt pcb. I dug it out and am working on the drive for the outputs.
