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Old 10th May 2012, 01:29 AM   #1
timwebb is offline timwebb  United States
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Default US Amps 3d

anyone have a schematic for this amp? some traces burnt and someone jumped them to other spots. i need to make sure it right before i go any further. thanks.
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Old 10th May 2012, 02:26 AM   #2
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Old 12th May 2012, 02:11 AM   #3
timwebb is offline timwebb  United States
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im waiting to hear back from them. i found the voltage regulators were shorted across and two op amps got hot.would a bad op amp blow the voltage regulators?
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Old 20th May 2012, 03:46 PM   #4
timwebb is offline timwebb  United States
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ok the dont give there schematics to no one i guess. the amp seems to have a problem with the voltage regulators. the 78 and 79 were shorted across all legs. i pulled the op amps. they are shorted across pins 1 and 8. just trying to see make sure im testing it right.
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Old 20th May 2012, 07:35 PM   #5
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Out of the circuit, if you read 0 ohms between the pins you listed, the components are defective.
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Old 20th May 2012, 08:00 PM   #6
timwebb is offline timwebb  United States
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i wanted to be sure cause every op amp reads 0 ohms across pin 1 and 8. all are out of circuit.
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Old 20th May 2012, 08:18 PM   #7
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What is the number on the op-amps?
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Old 20th May 2012, 08:36 PM   #8
timwebb is offline timwebb  United States
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4558 the pins are in line. i couldnt find the right data sheet for it.
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Old 20th May 2012, 11:27 PM   #9
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Those are not 1 and 8, those are 1 and 9. The ICs have 9 pins. This is normal. They allow you to pass positive supply voltage through the IC which helps with tight layouts.

Re-read the audio troubleshooting page, item #15.
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