torress1990
Newbie level 1
- Joined
- Apr 17, 2013
- Messages
- 1
- Helped
- 0
- Reputation
- 0
- Reaction score
- 0
- Trophy points
- 1,281
- Activity points
- 1,291
Hello, i want your help. I bought those speakers with damage. It won't start up, green power indicator was blinking/flashing. All outputs like +-24V, +12.9V, +9V; -8V; +4.4V is working, but +-70V is not working. So i replaced all capacitors, transistors all "IRF740" and "2SA92". Where i live it is impossible to get all part same as i found on board, so some capacitors like polyester are with bigger Voltage - is it OK? (that was the first question). I turned it ON, and i almost works: after transformer i see ~58V. But after bridge rectifier i don't get +-70V. So i ordered bridge rectifiers. I think i will get +- 70V. But there is another problem. IRF740 are heating like (the transistors base become black while i was measuring voltages, it took about 1 minute maybe 2 ) ... i don't know how to compare with... what should i do to eliminate that problem? could you help me ?
All the circuits i found:
**broken link removed**
All the circuits i found:
**broken link removed**
