PPI PC 6600.2

mike49504 · 14th October 2010, 01:22 PM

This amp wont power up heres the voltages i have on the 3525

1:2.58
2:4.48
3:.02
4:.35
5:2.17
6:3.18
7:2.12
8:4.90
9:.19
10:0
11:0
12:0
13:12.65
14:0
15:13.23
16:5.16

Any thoughts?

Perry Babin · 14th October 2010, 01:31 PM

With those input voltages, I'd suspect the IC as being defective.

mike49504 · 14th October 2010, 03:22 PM

Replaced the IC and it blew a fet i cut the bad fet out.
Now all the amp does is try to power on the green light comes on a sec then shuts off and repeats the cycle

Any ideas where to check now?

Perry Babin · 14th October 2010, 03:34 PM

How much current is it drawing?

Is pin 10 pulsing to ~5v?

mike49504 · 14th October 2010, 03:54 PM

Pin 10 is not pulsing at all its 0 volts all the time.

Amp only trys to draw 5 amps when trying to power on

Perry Babin · 14th October 2010, 03:58 PM

What do you have on pins 2 and 8?

mike49504 · 14th October 2010, 04:08 PM

Pin 2 is pulsing from .09 to 1.19 volts

Pin8 : 4.89 volts

Perry Babin · 14th October 2010, 04:10 PM

Are you sure there are no shorted outputs?

If you measure the DC voltage across every emitter resistor, does any one show more than 0.000v DC?

Is there any channel that pulses DC on its output?

mike49504 · 05:43 PM

All emitter resistors measure 0 volts.

I removed all of the outputs from the amp .

Amp still does the same thing.

every channel pulses dc on the outputs

Perry Babin · 14th October 2010, 05:46 PM

With the outputs out of the board, you would expect pulsing on the bases and collectors.

Are any of the thermistors shorted?

Do any of the emitter resistors appear to have overheated?

14th October 2010, 01:22 PM	#1
mike49504 diyAudio Member Join Date: Sep 2006	PPI PC 6600.2 This amp wont power up heres the voltages i have on the 3525 1:2.58 2:4.48 3:.02 4:.35 5:2.17 6:3.18 7:2.12 8:4.90 9:.19 10:0 11:0 12:0 13:12.65 14:0 15:13.23 16:5.16 Any thoughts?

14th October 2010, 01:31 PM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	With those input voltages, I'd suspect the IC as being defective. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

14th October 2010, 03:34 PM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	How much current is it drawing? Is pin 10 pulsing to ~5v? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

14th October 2010, 03:58 PM	#6
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	What do you have on pins 2 and 8? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

14th October 2010, 04:10 PM	#8
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Are you sure there are no shorted outputs? If you measure the DC voltage across every emitter resistor, does any one show more than 0.000v DC? Is there any channel that pulses DC on its output? __________________ 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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14th October 2010, 03:22 PM	#3
mike49504 diyAudio Member Join Date: Sep 2006	Replaced the IC and it blew a fet i cut the bad fet out. Now all the amp does is try to power on the green light comes on a sec then shuts off and repeats the cycle Any ideas where to check now?

14th October 2010, 03:54 PM	#5
mike49504 diyAudio Member Join Date: Sep 2006	Pin 10 is not pulsing at all its 0 volts all the time. Amp only trys to draw 5 amps when trying to power on

14th October 2010, 04:08 PM	#7
mike49504 diyAudio Member Join Date: Sep 2006	Pin 2 is pulsing from .09 to 1.19 volts Pin8 : 4.89 volts

14th October 2010, 05:39 PM	#9
mike49504 diyAudio Member Join Date: Sep 2006	All emitter resistors measure 0 volts. I removed all of the outputs from the amp . Amp still does the same thing. every channel pulses dc on the outputs Last edited by mike49504; 14th October 2010 at 05:43 PM.

14th October 2010, 05:46 PM	#10
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	With the outputs out of the board, you would expect pulsing on the bases and collectors. Are any of the thermistors shorted? Do any of the emitter resistors appear to have overheated? __________________ 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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