H
Hangglider
- Jan 1, 1970
- 0
I was at my office and a small spark of static electricity from my hand
has killed my subwoofer. The unit is UNGROUNDED...I can hardly believe
it, but it is. It has it's own power supply and a relatively simple
amplifier. I intend to add a ground to the unit!
If I plug in the unit, I get a hum and that's it. It doesn't matter if
there is an input plugged in or not. Does anyone have any
recommendations as to which components I should try replacing first?
Here is a listing of the components on the board:
Transistors:
TRANS PWR NPN 10A 60V
TRANS PWR PNP 10A 60V
TRANS PNP GP 800MA 45V
TRANS NPN GP 800MA 45V
Capacitors:
CAP 4700UF 25V ALUM ELECTROLYTIC RADIAL (2 for the power supply)
CAP .47UF 50V ELECTROLYTIC KMG RAD
CAP 470UF 25V ELECTROLYTIC SMG RAD
CAP 10UF 25V ELECTROLYTIC SMG RAD
CAP .0012UF 50V POLYESTER
CAP .0027UF 50V POLYESTER
CAP .1UF 50V POLY B SERIES
Resistors:
RES 4.7K OHM 1/4W 5% CARBON FILM
RES 47K OHM 1/4W 5% CARBON FILM
RES 220K OHM 1/4W 5% CARBON FILM
RES 150 OHM 1/4W 5% CARBON FILM
RES 100 OHM 1/4W 5% CARBON FILM
IC:
IC OP AMP HI PERFORMANCE 8-DIP
Any advice is greatly appreciated!
Thanks,
Joe
has killed my subwoofer. The unit is UNGROUNDED...I can hardly believe
it, but it is. It has it's own power supply and a relatively simple
amplifier. I intend to add a ground to the unit!
If I plug in the unit, I get a hum and that's it. It doesn't matter if
there is an input plugged in or not. Does anyone have any
recommendations as to which components I should try replacing first?
Here is a listing of the components on the board:
Transistors:
TRANS PWR NPN 10A 60V
TRANS PWR PNP 10A 60V
TRANS PNP GP 800MA 45V
TRANS NPN GP 800MA 45V
Capacitors:
CAP 4700UF 25V ALUM ELECTROLYTIC RADIAL (2 for the power supply)
CAP .47UF 50V ELECTROLYTIC KMG RAD
CAP 470UF 25V ELECTROLYTIC SMG RAD
CAP 10UF 25V ELECTROLYTIC SMG RAD
CAP .0012UF 50V POLYESTER
CAP .0027UF 50V POLYESTER
CAP .1UF 50V POLY B SERIES
Resistors:
RES 4.7K OHM 1/4W 5% CARBON FILM
RES 47K OHM 1/4W 5% CARBON FILM
RES 220K OHM 1/4W 5% CARBON FILM
RES 150 OHM 1/4W 5% CARBON FILM
RES 100 OHM 1/4W 5% CARBON FILM
IC:
IC OP AMP HI PERFORMANCE 8-DIP
Any advice is greatly appreciated!
Thanks,
Joe