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-   -   Rockford Fosgate BD500 (http://www.diyaudio.com/forums/car-audio/170350-rockford-fosgate-bd500.html)

mike49504 17th July 2010 03:56 AM

Rockford Fosgate BD500
 
This amp is producing positive rail voltage + 73 volts on the IRF540's

On the 9540's i have .004 volts on them.

Wondering what might cause this??

Perry Babin 17th July 2010 11:28 AM

What's the DC voltage across legs 1 and 3 of the 9540s?

mike49504 17th July 2010 03:19 PM

Black probe on leg 1 red probe on leg 3: 9.7 volts

Perry Babin 17th July 2010 06:05 PM

Is there any DC on the speaker terminals?

If so, what is the voltage (positive/negative is important, black probe on the negative speaker terminal)?

mike49504 17th July 2010 07:28 PM

Black probe on negative speaker terminal Red probe on positive speaker terminal : 0 volts And also checked in millivots still 0

Perry Babin 17th July 2010 07:38 PM

Is the amp in protect mode?

mike49504 17th July 2010 08:07 PM

Yes

Perry Babin 17th July 2010 08:28 PM

Voltage on U21?

mike49504 18th July 2010 03:52 AM

U21
1:-8.24
2:7.90
3:-8.83
4:-9.67
5:5.00
6:-4.15
7:8.51
8:9.82

Perry Babin 18th July 2010 07:43 AM

U21 is very likely defective.


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