Power Acoustik BAMF5500, no output - diyAudio
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Old 7th March 2011, 10:33 PM   #1
FireII is offline FireII  United States
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Default Power Acoustik BAMF5500, no output

Howdy,
I got a Power Acoustik BAMF 5500 that produces no audio output. I've got 115v +/- on the rectifiers, no DC on output terminals, actually I've got 0.0000v on terminals(seems strange because I've never had that exact of a number before, they are not shorted though), I can't trace down the audio signal because as soon as they go through the first 15,000ohm resistor the signal is no longer usable.Output voltages are as follows -

IRFP264N

NEG
Gate -115
Drain 0
Source -116

POS
Gate 0
Drain +115
Source 0

Edit : Customer said he was "beatin' on it pretty hard when it cut out", I hear the relays click during power on and power off, but I'm not sure how the power acoutiks go about clamping the signal.

Last edited by FireII; 7th March 2011 at 10:35 PM.
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Old 7th March 2011, 11:01 PM   #2
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Do you have signal on the small output filter inductor?

If so, the relays may have failed. When they fail, they generally melt.
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Old 7th March 2011, 11:17 PM   #3
FireII is offline FireII  United States
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I do not, before when I wrote I had zero output signal, after doing some probing I've managed to get a VERY small output on audio components, not sure how it came about but it's only ~10mV that does correspond with the input sine wave.

Kinda scratchin my head on this one.....

The relays appear to be fine, visually, but I have not checked for sure. How does this amp go about clamping the signal?
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Old 7th March 2011, 11:18 PM   #4
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Is there any significant DC on the output pins of the op-amps near the RCA jacks?
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Old 7th March 2011, 11:31 PM   #5
FireII is offline FireII  United States
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Quote:
Originally Posted by Perry Babin View Post
Is there any significant DC on the output pins of the op-amps near the RCA jacks?

I have half a volt on one, the rest are ~3mV
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Old 7th March 2011, 11:50 PM   #6
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1/2v seems a bit high.

Do you have audio reaching the class D driver board?

If not, have you followed it through the op-amps to see where it stops?
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Old 7th March 2011, 11:58 PM   #7
FireII is offline FireII  United States
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Quote:
Originally Posted by Perry Babin View Post
1/2v seems a bit high.

Do you have audio reaching the class D driver board?

If not, have you followed it through the op-amps to see where it stops?

Yes, I do have audio in the driver board. As to where it starts and ends, I'm not sure. My "specialty" has been in older A/B amps, with only about 15% of my business being class D, you'll have to excuse my ignorance.
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Old 8th March 2011, 01:27 AM   #8
FireII is offline FireII  United States
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I've found the output drivers on the driver board, the signal is VERY weak, I can only see the negative half with my scope because the positive side has such high voltage on them.
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Old 8th March 2011, 01:53 AM   #9
FireII is offline FireII  United States
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Do you happen to know where the relay outputs are on the top side of the board? I noticed that the clicking only happends when B+ is applied or taken away from B+ and B-, not remote.
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Old 8th March 2011, 01:56 AM   #10
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The relays connect the small inductor to the positive speaker terminals. Do you have the board out of the sink?
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