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Old 17th July 2010, 03:56 AM   #1
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Default 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??
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Old 17th July 2010, 11:28 AM   #2
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What's the DC voltage across legs 1 and 3 of the 9540s?
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Old 17th July 2010, 03:19 PM   #3
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Black probe on leg 1 red probe on leg 3: 9.7 volts
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Old 17th July 2010, 06:05 PM   #4
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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)?
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Old 17th July 2010, 07:28 PM   #5
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Black probe on negative speaker terminal Red probe on positive speaker terminal : 0 volts And also checked in millivots still 0
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Old 17th July 2010, 07:38 PM   #6
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Is the amp in protect mode?
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Old 17th July 2010, 08:07 PM   #7
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Yes
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Old 17th July 2010, 08:28 PM   #8
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Voltage on U21?
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Old 18th July 2010, 03:52 AM   #9
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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
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Old 18th July 2010, 07:43 AM   #10
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U21 is very likely defective.
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