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Old 12th July 2011, 03:23 AM   #1
Dr Zeus is offline Dr Zeus  United States
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Default Rockford Power BD1000.1

This amp seems to be a bit of a stumper for me. I read the section on BD1500 on the DVD and am still a little confused as to what is going on with this amp.

It powers and is stable on the bench out of the sync. Rail voltage seems to be a bit confusing; either that or secondary ground has floated well beyond what I normally see, although now as I type this up I believe this amp really only produces positive rail voltate. Referencing amp's general ground, I see 112vDC at the rail and 56vDC on RCA shields. If i reference R44 which I believe is CT I see +57vDC and -55vDC at the rails, but I also see -55vDC on RCA shields.

Referecing RCA shields, I measure expected voltages on the opAmps except for U4, which may be dragging the regulated voltage down to +9vDC and -10vDC. To be more clear, the other three opamps are seeing +-13.5vDC on the power pins. U4 is showing ~0 volts on remaining pins except pin 1, which has -.65vDC on it. Both sets of LM3x7 regulators seems to be running hotter than expected.

There appears to be somewhat decent audio waves on several of the opamp pins but the audio path may not be reaching the outputs.
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Old 12th July 2011, 03:30 AM   #2
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There are actually 3 pairs of LM317/LM337 regulators on this amp. Q15/Q16 and Q1/Q3 are getting much hotter than Q13/Q14
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Old 12th July 2011, 03:36 AM   #3
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Measure the rail voltage across the twisted red/black wires.

Do you have audio on U4, pin 1?
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Old 12th July 2011, 03:38 AM   #4
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Boy, these rockford amps are quite different than their Class-AB counterparts. The LED on the side near the RCA shields indicates protection, and it is illuminated when the amp is powered.
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Old 12th July 2011, 03:44 AM   #5
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Quote:
Measure the rail voltage across the twisted red/black wires.
I measure 114vDC directly across them. Referencing amp ground I get 0vDC on the black wire and 114vDC on the red wire.

Yes, U4 has audio on pin #1
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Old 12th July 2011, 03:50 AM   #6
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Voltage on all 8 pins of U17?

Pin 1:
Pin 2:
Pin 3:
Pin 4:
Pin 5:
Pin 6:
Pin 7:
Pin 8:
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Old 13th July 2011, 03:21 AM   #7
Dr Zeus is offline Dr Zeus  United States
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U17 is an LM6171

Pin 1: 0.003
Pin 2: 0.052
Pin 3: 0.050
Pin 4: -9.40
Pin 5: 0.001
Pin 6: -1.237
Pin 7: 9.76
Pin 8: 0.010
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Old 13th July 2011, 03:44 AM   #8
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It appears to be OK. What is the DC voltage on pin 2 of U5 and U8?

What's the DC voltage on pin 6 and pin 7 of U21?
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Old 13th July 2011, 04:24 AM   #9
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U5 and U8
Pin 2: 6.42

U21
Pin 6: -8.67
Pin 7: 8.45
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Old 13th July 2011, 05:01 AM   #10
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U21 is defective. The amp is in protect mode. The protection LED should be lit.
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