I'm doing the backplane on my PL400. I had previously done the control board and used the amp for a year or so with no issues. I converted the control board to full complementary. I'm at the stage where I have one row of transistors and installed the control board into the unit. All tests up to this point have been good. But after installing the board I am getting around 100mV on the right channel output, left channel is zero Volts. Power supply voltages look good.
If it makes any difference the dc protect board is installed and the outputs are connected to it, but no power is connected to the protect board.
Any suggestions on where to look? Thanks.
If it makes any difference the dc protect board is installed and the outputs are connected to it, but no power is connected to the protect board.
Any suggestions on where to look? Thanks.
Last edited: