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-   -   US Amps 3d (http://www.diyaudio.com/forums/car-audio/212411-us-amps-3d.html)

timwebb 10th May 2012 01:29 AM

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.

brandes.cm 10th May 2012 02:26 AM

Have you tried RE Audio?

timwebb 12th May 2012 02:11 AM

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?

timwebb 20th May 2012 03:46 PM

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.

Perry Babin 20th May 2012 07:35 PM

Out of the circuit, if you read 0 ohms between the pins you listed, the components are defective.

timwebb 20th May 2012 08:00 PM

i wanted to be sure cause every op amp reads 0 ohms across pin 1 and 8. all are out of circuit.

Perry Babin 20th May 2012 08:18 PM

What is the number on the op-amps?

timwebb 20th May 2012 08:36 PM

4558 the pins are in line. i couldnt find the right data sheet for it.

Perry Babin 20th May 2012 11:27 PM

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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