PPI A200 wont power up

Dr Zeus · 9th January 2012, 12:29 AM

I've got this and a working A600.2 if its worth referencing parts for fixing this A200. This amp will now power up on the bench. No LEDs, no drive voltage to the fets. Non of the fets nor outputs are shorted. All outputs are measuring exactly 47 ohms across legs 1&3. It has a SG3525A:

SG3525A
Pin 1: 0.287
Pin 2: 2.568
Pin 3: 0.023
Pin 4: 0.338
Pin 5: 2.058
Pin 6: 3.631
Pin 7: 2.047
Pin 8: 0.005
Pin 9: 5.98
Pin 10: 0.001
Pin 11: 0.009
Pin 12: 0.001
Pin 13: 13.21
Pin 14: 0.010
Pin 15: 13.21
Pin 16: 5.16

1moreamp · 9th January 2012, 12:41 AM

how about the voltage on the fets leads ? what do they read ?

Dr Zeus · 9th January 2012, 12:52 AM

Fets are IRFZ44. This amp is 100% original never been worked on.

Leg 1: 0.009
Leg 2: 13.77 (+B ~0 ohms)
Leg 3: 0.001 (Ground ~0 ohms)

ivkata · 9th January 2012, 01:08 AM

u don't have any output of the SG3525A
so i think its replated no power

Dr Zeus · 9th January 2012, 01:25 AM

Are you thinking the sg3525a is defective?

ivkata · 9th January 2012, 01:35 AM

there should be an op amp as well near the sg3525a maybe u should check for power on it and output as well.In the past i had units fail to power due to bad op amp .Im newbie in this as well but hey 2 heads are better than one

Dr Zeus · 9th January 2012, 02:20 AM

Hmm this amp is different that what you are thinking, or a different rev. There are only 2 opamps in the whole amp and only in the audio section.

ivkata · 9th January 2012, 02:32 AM

how about the rp1 ic in the past i had orrion that failed to power due to the ic not getting power .have u tested transistors near the 3525a

Perry Babin · 9th January 2012, 03:02 AM

What's connected to pin 8? If nothing is connected to it, preventing it from going to 5v, I'd suggest replacing the IC.

If you short pin 8 to 5v (pin 16), does the IC produce output?

Dr Zeus · 9th January 2012, 03:40 AM

Pin 8 is connected to the 3rd leg of an MPSA06 at Q40.

Q40:
Leg 1: 0.001
Leg 2: 0.685
Leg 3: 0.005

Shorting Pin 8 & 16 only change Leg 3 of Q40 to 5vdc

Shorting Pin 8 to Pin 16 allows the amp to power up with regulated PS, but after about 10 seconds the amp flickers on/off with power and low-imp LEDs flickering. During <10 seconds regulated voltage look OK, but rail voltage drops from +-24v down to +-22v. Once it hits +-22v everything flickers.

9th January 2012, 12:29 AM	#1
Dr Zeus diyAudio Member Join Date: Oct 2010	PPI A200 wont power up I've got this and a working A600.2 if its worth referencing parts for fixing this A200. This amp will now power up on the bench. No LEDs, no drive voltage to the fets. Non of the fets nor outputs are shorted. All outputs are measuring exactly 47 ohms across legs 1&3. It has a SG3525A: SG3525A Pin 1: 0.287 Pin 2: 2.568 Pin 3: 0.023 Pin 4: 0.338 Pin 5: 2.058 Pin 6: 3.631 Pin 7: 2.047 Pin 8: 0.005 Pin 9: 5.98 Pin 10: 0.001 Pin 11: 0.009 Pin 12: 0.001 Pin 13: 13.21 Pin 14: 0.010 Pin 15: 13.21 Pin 16: 5.16

9th January 2012, 03:02 AM	#9
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	What's connected to pin 8? If nothing is connected to it, preventing it from going to 5v, I'd suggest replacing the IC. If you short pin 8 to 5v (pin 16), does the IC produce 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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9th January 2012, 12:41 AM	#2
1moreamp diyAudio Member Join Date: Dec 2005 Location: Northern California	how about the voltage on the fets leads ? what do they read ?

9th January 2012, 12:52 AM	#3
Dr Zeus diyAudio Member Join Date: Oct 2010	Fets are IRFZ44. This amp is 100% original never been worked on. Leg 1: 0.009 Leg 2: 13.77 (+B ~0 ohms) Leg 3: 0.001 (Ground ~0 ohms)

9th January 2012, 01:08 AM	#4
ivkata diyAudio Member Join Date: Dec 2010	u don't have any output of the SG3525A so i think its replated no power

9th January 2012, 01:25 AM	#5
Dr Zeus diyAudio Member Join Date: Oct 2010	Are you thinking the sg3525a is defective?

9th January 2012, 01:35 AM	#6
ivkata diyAudio Member Join Date: Dec 2010	there should be an op amp as well near the sg3525a maybe u should check for power on it and output as well.In the past i had units fail to power due to bad op amp .Im newbie in this as well but hey 2 heads are better than one

9th January 2012, 02:20 AM	#7
Dr Zeus diyAudio Member Join Date: Oct 2010	Hmm this amp is different that what you are thinking, or a different rev. There are only 2 opamps in the whole amp and only in the audio section.

9th January 2012, 02:32 AM	#8
ivkata diyAudio Member Join Date: Dec 2010	how about the rp1 ic in the past i had orrion that failed to power due to the ic not getting power .have u tested transistors near the 3525a

9th January 2012, 03:40 AM	#10
Dr Zeus diyAudio Member Join Date: Oct 2010	Pin 8 is connected to the 3rd leg of an MPSA06 at Q40. Q40: Leg 1: 0.001 Leg 2: 0.685 Leg 3: 0.005 Shorting Pin 8 & 16 only change Leg 3 of Q40 to 5vdc Shorting Pin 8 to Pin 16 allows the amp to power up with regulated PS, but after about 10 seconds the amp flickers on/off with power and low-imp LEDs flickering. During <10 seconds regulated voltage look OK, but rail voltage drops from +-24v down to +-22v. Once it hits +-22v everything flickers.

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