PPI PC4400.2

mike49504 · 4th July 2011, 02:10 AM

The power light on this amp will light up then within 3 secs shut off

The amp is producing both + - 30 volts on the rails

I also have + - regulated voltages..

But the power light shuts off within 3 secs after powering up and the amp has no output..

Any ideas??

Perry Babin · 4th July 2011, 11:02 AM

Does the power supply remain on after the LED goes out?

Measure the DC voltage across the leads of the LED. Does it go from positive to negative 15v (or vice-versa, depending on the probe orientation)?

mike49504 · 4th July 2011, 01:31 PM

Think i figured it out . The positive regulator was doing some wierd stuff.

One time it would work and show 15 volts the next time it would show 2 volts and so on i replaced it and amp powers up and plays perfectly

4th July 2011, 02:10 AM	#1
mike49504 diyAudio Member Join Date: Sep 2006	PPI PC4400.2 The power light on this amp will light up then within 3 secs shut off The amp is producing both + - 30 volts on the rails I also have + - regulated voltages.. But the power light shuts off within 3 secs after powering up and the amp has no output.. Any ideas??

4th July 2011, 11:02 AM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Does the power supply remain on after the LED goes out? Measure the DC voltage across the leads of the LED. Does it go from positive to negative 15v (or vice-versa, depending on the probe orientation)? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

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4th July 2011, 01:31 PM	#3
mike49504 diyAudio Member Join Date: Sep 2006	Think i figured it out . The positive regulator was doing some wierd stuff. One time it would work and show 15 volts the next time it would show 2 volts and so on i replaced it and amp powers up and plays perfectly

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