This is a turntable but it seems to be a power supply issue so I'll try this subforum.
This turntable spun backwards, then I recapped it (since I read this is a common issue and old caps are at fault), now I can't get it to do anything. I checked my work multiple times and can't find any issue. Working through it with the voltmeter I found the +/- 15V power supply isn't working.
I'm a bit confused by the schematic, the emitter and collector of the regulators are in opposite positions from what I'm used to. Normally power goes in the collector, is controlled by the base, then the regulated voltage comes out the emitter.
In the schematic, the base and emitter of TR1 are both 24V, and the base and emitter of TR19 are both -24V. And there's no voltage on the collectors. I tried replacing TR1 and no change.
Can anyone help? A description of how the power supply circuit works would be helpful. I'm not sure how the power switch system works for this unit either. I'm a full time tech, but B&O never seems to give me good luck.
Full schematic available here.
Browse Beogram - Beogram 8002 manuals
This turntable spun backwards, then I recapped it (since I read this is a common issue and old caps are at fault), now I can't get it to do anything. I checked my work multiple times and can't find any issue. Working through it with the voltmeter I found the +/- 15V power supply isn't working.
I'm a bit confused by the schematic, the emitter and collector of the regulators are in opposite positions from what I'm used to. Normally power goes in the collector, is controlled by the base, then the regulated voltage comes out the emitter.
In the schematic, the base and emitter of TR1 are both 24V, and the base and emitter of TR19 are both -24V. And there's no voltage on the collectors. I tried replacing TR1 and no change.
Can anyone help? A description of how the power supply circuit works would be helpful. I'm not sure how the power switch system works for this unit either. I'm a full time tech, but B&O never seems to give me good luck.
Full schematic available here.
Browse Beogram - Beogram 8002 manuals