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Rockford Fosgate T1500-1BDCP  ------ No Output
Rockford Fosgate T1500-1BDCP  ------ No Output
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Old 26th August 2013, 03:41 AM   #1
spooney is offline spooney  United States
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Default Rockford Fosgate T1500-1BDCP ------ No Output

Well this amplifier was working beautifully until today. I was actually selling it to a local guy and when he hooked it up to test it there was no output after having been pulled from my own install working perfectly fine. A quick look at his install after trouble arose and I noticed that his rca cables were patched directly into his rear speaker wires........... no line output converter or anything just rca cables twisted directly to the speaker wires and held together with packaging tape. So I'm assuming that this potentially fried something in the input circuitry. The amplifier powers on normally and idles just fine. The amp is not in protect mode. There is rail voltage present at the output fets but I have no output. Can anyone maybe point me in some directions as to where to start looking or maybe have experience with a similar issue they could share? It would be greatly appreciated
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Old 26th August 2013, 05:59 AM   #2
spooney is offline spooney  United States
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Also wanted to add that there is no dc present on the output terminals.
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Old 26th August 2013, 10:24 AM   #3
Perry Babin is offline Perry Babin  United States
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That shouldn't have damage the input circuit. Do you have a scope?
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Old 26th August 2013, 12:49 PM   #4
spooney is offline spooney  United States
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Yes I do Perry
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Old 26th August 2013, 02:07 PM   #5
Perry Babin is offline Perry Babin  United States
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Drive a 1v sine wave into the amp and look at the signal on the output pins of the various op-amps (starting near the RCA jacks). Where is the signal lost.
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Old 26th August 2013, 05:20 PM   #6
spooney is offline spooney  United States
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Do you have any info on the circuit board designations for the various op amps in the signal path?
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Old 26th August 2013, 05:49 PM   #7
Perry Babin is offline Perry Babin  United States
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The first one is U3 behind the RCAs. Do you have audio there?

Do you have 15v on the power supply pins?
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Old 27th August 2013, 12:03 AM   #8
spooney is offline spooney  United States
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Perry,

There is approximately +/- 10.5 volts on the power supply pins of the IC.

Is this too low?

The IC does produce a sine wave on the output pin that is essentially equal in voltage (1volt) to the input voltage of the IC however the output looks "fuzzy" in comparison on the scope.

Should the output voltage be the same as the input?
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Old 27th August 2013, 12:46 PM   #9
Perry Babin is offline Perry Babin  United States
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The 10v is probably OK.

I think this is a buffer. If so, the input and output would be the same.

There are several large SMD resistors near the class D section that you need to check the voltage on. Email me and I'll send you a photo showing the voltages.
babin_perry@yahoo.com
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