I've got a problem with an A-550, the relay clicks on, however the bias measurement is 0 at any pot setting. It plays music but there is a lot of distortion, presumably because of the bias issue.
The problem is the same on both channels, which makes me wonder if the problem is something common to them, or if the same part/s have failed on both channels.
Hifiengine page:
https://www.hifiengine.com/manual_library/yamaha/a-550.shtml
Schematic for power amp (one channel):
Appreciate any suggestions!
The problem is the same on both channels, which makes me wonder if the problem is something common to them, or if the same part/s have failed on both channels.
Hifiengine page:
https://www.hifiengine.com/manual_library/yamaha/a-550.shtml
Schematic for power amp (one channel):
Appreciate any suggestions!