Luxman LV-113 left channel problem

[Mørbeck]

Hey guys

A Luxman LV-113 amplifier has a problem with the left channel, both A/B speaker output. We troubleshooted speakers and cables, all work on the right side of A and B but not on the left. Interestingly, there is stereo sound coming out of the headphone port. Furthermore, when the amp is used as a pre-amp only connected to another amp, we are able to have full stereo and both left and right channels are reproduced. This is a great solution, but we still want to see if we can the Luxman amp fixed properly.

We opened up the amplifier and all capacitors, cables and fuses seemed all right. You have any idea on what the problem could be?

 

[Goldie99]

I can't see any difference between the headphones output and the speaker outputs, except the speaker selection switches.... so I'd suggest a good dose of deoxit on those switches would be a good place to start.

Maybe also worth inspecting & 're-seating' the connectors & cable between the power switch board (where the speaker switches are also mounted) and the speaker terminal board.