Hello everyone.
I have already read all the posts about this problem and I have changed out all the "usual" suspect parts. The problem is I am still having the same problem. After downloading the schematic and tracing the power I ended up figuring that off my phase inverter pin 2 on the opposite side of the .022uf 400v cap I have 0V. So the first thing I did was lift the side of the cap that had 0V and to my surprise I had power on the other side of the cap. After that I tested the R40 and R38 resistors. The resistor values were correct so I landed the .022uf 400v cap back on the board then lifted the ribbon cable that feeds the preamp board. I am now getting power through that cable that should be feeding the preamp board. So the next thing I did was remove the C52(.0068uf 100v) cap. I have power to this point and that's where I am at to this point. Can someone please tell me if the problem could be the U2 IC chip? I have no control at the Master volume and no power at all in the power amp section because of this. It seems like a short somewhere thats dropping my voltage to 0V. Any help would be greatly appreciated. This repair is driving me crazy and I want to make sure I order the right parts so this repair is fixed.
Thanks
Colin
I have already read all the posts about this problem and I have changed out all the "usual" suspect parts. The problem is I am still having the same problem. After downloading the schematic and tracing the power I ended up figuring that off my phase inverter pin 2 on the opposite side of the .022uf 400v cap I have 0V. So the first thing I did was lift the side of the cap that had 0V and to my surprise I had power on the other side of the cap. After that I tested the R40 and R38 resistors. The resistor values were correct so I landed the .022uf 400v cap back on the board then lifted the ribbon cable that feeds the preamp board. I am now getting power through that cable that should be feeding the preamp board. So the next thing I did was remove the C52(.0068uf 100v) cap. I have power to this point and that's where I am at to this point. Can someone please tell me if the problem could be the U2 IC chip? I have no control at the Master volume and no power at all in the power amp section because of this. It seems like a short somewhere thats dropping my voltage to 0V. Any help would be greatly appreciated. This repair is driving me crazy and I want to make sure I order the right parts so this repair is fixed.
Thanks
Colin
Comment