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Old 6th May 2012, 08:34 AM   #1
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Default ppi 2400 amplifier

Hello,
I need help on this one: ppi 2400 drawing too much current when turned on.
I removed power supply fets and verified pmw signals to be ok 33khz perfect square signals. once I put power supply fets back it draws a lot of current. I lifted x-former secondary outputs an still the same draws too much current. I'm not familiar with these amplifiers, I wonder if the regulation circuit causes that. does anyone has a schematic of the power supply or any tips on how to fix. Any help would be greatly appreciated.
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Old 6th May 2012, 09:38 AM   #2
timwebb is offline timwebb  United States
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i dont know much about this amp but i would remove the rectifiers to get the power supply running. i think your issue may be in the output section though
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Old 6th May 2012, 03:55 PM   #3
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I have lifted the transformer secondaries. this is the same as removing the rectifiers and still draws current. xformer is not shorted either.
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Old 7th May 2012, 12:01 AM   #4
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Quote:
Originally Posted by elchino10 View Post
I have lifted the transformer secondaries. this is the same as removing the rectifiers and still draws current. xformer is not shorted either.
had check the primary coil of the transformer? also check the waveform at the gate terminals with FET are present.

Last edited by nonprof; 7th May 2012 at 12:04 AM.
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Old 7th May 2012, 01:18 AM   #5
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primary coils are ok, I can not check waveforms with fets in the boards because it is drawing too much current. I think the problem lies in the regulation but I'm not familiar with these models maybe someone out there can provide a tip
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Old 7th May 2012, 03:32 AM   #6
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The regulation doesn't cause this sort of problem.

With the power supply FETs out of the circuit, connect a 1000pf capacitor across the gate and source pads for the power supply FETs and look at the signal with a scope. Do you still have a clean square wave on the gate pads?

How did you determine that the primary isn't shorted?
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Old 7th May 2012, 04:21 AM   #7
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Thanks Perry, I will try that. to determine if the xformer primary was not shorted I simply took it out of the circuit and measure for short between primary windinds as well as secondary to primary shorts and short between secondaries. I'm not sure why i'm having a hard time fixing something that seems very simple to fix but maybe I'm overlooking something simple.
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Old 7th May 2012, 07:47 AM   #8
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If a transformer has a winding shorted to itself, it's difficult to find with a standard multimeter. You generally have to use a 'ringer' or an inductance meter to find that type of short. A shorted turn in the primary or the secondary could cause excessive current draw, even with the secondary windings disconnected.
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Old 9th May 2012, 06:53 AM   #9
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of course I took the xformer out to test for shorts, I didn't test it in-circuit. Thanks for your reply. What I ended up doing was: Rewind the transformer (using the same core) and that took care of the problem. Thanks for all your help!
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Old 9th May 2012, 08:20 AM   #10
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If that solved the problem, it almost certainly had a shorted turn.
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