Vintage Pioneer Troubleshooting
Howdy folks,
I've got this old Pioneer QX-747 receiver. Quadraphonic, wood, whole 9 yards. Looks good, worked good too last time I turned it off a couple years ago. Put it on a shelf and didn't touch it 'til today. Turned it on and tuned in a station. After a couple seconds the audio cut out. The signal meter seemed to indicate I was still getting a signal, but no sound could be heard. Before I could think to mess with any of the controls, the sound came back on. For a second or two. Then it cut out again. Then on again, then off. Then it stayed off. I tried adjusting all the little pots for the quadraphonic, volume, speaker selector. I tried switching over to quadraphonic mode and using the rear speaker outputs. Still no sound. I popped the case off it and looked around in there. I didn't see anything glaringly obvious like melted semiconductors or whatnot... Any ideas?