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Rockford Fosgate Power 500bd no output.
Rockford Fosgate Power 500bd no output.
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Old 16th March 2019, 02:06 AM   #1
rhempz01 is offline rhempz01  United States
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Default Rockford Fosgate Power 500bd no output.

The amplifier sounds as if everything NJ is functioning as intended. Yet there is no audio output. I have oscillation, a healthy power supply.
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Old 16th March 2019, 02:16 AM   #2
rhempz01 is offline rhempz01  United States
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Correction, has audio, with static and thumping from the switches.
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Old 16th March 2019, 03:19 AM   #3
Perry Babin is offline Perry Babin  United States
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Have you tried cleaning the pots and switches?

Is the audio clean at U4, pin 1?

If the switches thump loudly when switching positions, it could be due to an op-amp with significant DC on its output.
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Old 16th March 2019, 06:43 AM   #4
rhempz01 is offline rhempz01  United States
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Looks like there is some noise surrounding it. Grounded at the rca sheild.
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Old 16th March 2019, 06:44 AM   #5
rhempz01 is offline rhempz01  United States
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U4 pin 1 40hz 5v
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Old 16th March 2019, 06:47 AM   #6
Perry Babin is offline Perry Babin  United States
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Are the RCA shield grounds intact?

With no RCAs plugged in, what's the resistance between the RCA input shields and the main ground terminal?
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Old 16th March 2019, 08:03 AM   #7
rhempz01 is offline rhempz01  United States
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.980kohm
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Old 16th March 2019, 08:23 AM   #8
Perry Babin is offline Perry Babin  United States
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Are the RCA shield grounds intact?
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Old 17th March 2019, 07:23 PM   #9
rhempz01 is offline rhempz01  United States
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Yes rca sheild grounds are in tach. It has a very distant static sound. Something is wrong. Its like it has a bad signal ground
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Old 18th March 2019, 02:35 AM   #10
Perry Babin is offline Perry Babin  United States
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Do you read 0 ohms between the signal source RCA shield ground and the ground terminal of the amplifier?
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