PPI-4100AM schematics - diyAudio
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Old 3rd September 2009, 02:00 PM   #1
orbanp is offline orbanp  Canada
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Default PPI-4100AM schematics

Hello Everyone,

Looking for the schematics of the Precision Power 4100AM amplifier.
The amplifier came with a car and needs repair.
I only found the user manual on the PPI site.

Thanks, Peter
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Old 3rd September 2009, 03:20 PM   #2
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Location: Louisiana
What's wrong with the amp?
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Old 4th September 2009, 12:42 PM   #3
orbanp is offline orbanp  Canada
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Probably something in the switching PS part. The amp does not turn on. Visibly, I can not see any blown components.
Do you have a schematics to share?
I did e-mail to PPI but they never bothered replying.

Thanks, Peter
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Old 4th September 2009, 04:23 PM   #4
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Location: Louisiana
I don't have a schematic for this amp. I'm assuming that it's like the 4200AM.
http://ampguts.realmofexcursion.com/PPI_4200AM/

Post the DC voltage on all 16 pins of the power supply driver IC (likely an SG3525).


Pin 1:
Pin 2:
Pin 3:
Pin 4:
Pin 5:
Pin 6:
Pin 7:
Pin 8:
Pin 9:
Pin 10:
Pin 11:
Pin 12:
Pin 13:
Pin 14:
Pin 15:
Pin 16:
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Old 4th September 2009, 05:36 PM   #5
orbanp is offline orbanp  Canada
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Hi Perry,

I did see those pictures while I was searching for documentation on the amp.
Mine looks similar, though less power transistors on the sides, it is only 4x25W.
The PCB silkscreen says that it is a PPI 4030 Rev x board. (Don't remember which revision it was.)
I also did find the documentation on the SMPS controller chip, that also should help.
I just hoped that the schematics is available somewhere, and that would make life a lot simpler.

Thanks, Peter
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