Another Rockford Fosgate Punch 200ix repair

cebby · 03:39 AM

OK, typed a nice long post only to get sent back to the login screen when posting...

Anyway - short version, bought a 200ix on eBay 3-4 years ago from reputable seller. Never tested amp until today (I know, dumb...). Just saw the tamper stickers were torn, so I decided to take a peek and found this atrocity:

Click for high res of full board - great for zooming in

All I found was a PDF schematic, not a PCB layout and am having a little trouble reading it.

I'd like to salvage this amp - it has some brothers to play with...

Any guidance would be greatly appreciated!

seankane · 7th September 2011, 04:06 AM

The board location is D10. The part number is a Motorola IN4003.

seankane · 7th September 2011, 04:17 AM

It also looks like but hard to tell because the flash from your camera on the board that your driver transistors for the power supply are burned.

I cant tell for sure these are board location Q2, Q3, Q4, Q5.

These will have markings of 1A or 1AM and the others will be a 2A.

The 1A or 1AM will be part number: MMBT3904
The 2A will be part number : MMBT3906

Does the amp power on or produce audio?

cebby · 7th September 2011, 04:44 AM

Amp powers on, but the power LED is dim compared to my other working Punch amps. No audio.

cebby · 7th September 2011, 05:00 AM

I took more shots of the business end...sort of a walk-around and a few close ups at the end.

Pic 1
Pic 2
Pic 3
Pic 4
Pic 5
Pic 6
Pic 7
Pic 8
Pic 9

seankane · 7th September 2011, 05:32 AM

What do you have for tools and test equipment?

Sounds like you have a partial power supply failure. At this point I would rebuild the whole power supply.

Do you at least have a multimeter?

cebby · 7th September 2011, 05:48 AM

Yes, I have a Fluke 115 multimeter, various soldering irons, etc. No scopes or anything like that though.

seankane · 7th September 2011, 07:13 AM

Set your meter in ohms with the range on auto and measure the rsistance between the gate and source legs of all 4 power supply fets. That would be leg 1 and 3 looking at the fet from left to right, what do you get?

The board location of these fets is Q10,Q11,Q6,Q7

Next measure the gate drivers resistance the little smd resistors marked 510 what do you get? These are 51 ohm and should read somewhat close to that.

The board location of these resistors is R31,R36,R32,R37

seankane · 7th September 2011, 07:15 AM

Post your results then we will check the gate drive voltage of the power supply fets.

Perry Babin · 7th September 2011, 01:58 PM

As a side note...

On this site (and others), if you type anything that would take more than 1 minute to re-type, highlight the text and copy it to the clipboard (ctrl-c or right-click and select copy) before clicking anything that will move you from the page where you typed it. It's happened to me so many times that I always do this for long posts.

7th September 2011, 03:20 AM	#1
cebby diyAudio Member Join Date: Sep 2011 Location: Western PA	Another Rockford Fosgate Punch 200ix repair OK, typed a nice long post only to get sent back to the login screen when posting... Anyway - short version, bought a 200ix on eBay 3-4 years ago from reputable seller. Never tested amp until today (I know, dumb...). Just saw the tamper stickers were torn, so I decided to take a peek and found this atrocity: Click for high res of full board - great for zooming in All I found was a PDF schematic, not a PCB layout and am having a little trouble reading it. I'd like to salvage this amp - it has some brothers to play with... Any guidance would be greatly appreciated! Last edited by cebby; 7th September 2011 at 03:39 AM.

7th September 2011, 04:06 AM	#2
seankane diyAudio Member Join Date: May 2010 Location: Washington State	The board location is D10. The part number is a Motorola IN4003. __________________ Pyramid 46 Amp Power Supply----Fluke 787 Processmeter----Tektronix 465 Scope----Velleman HPS40 Scope----Soldering Iron----Desoldering Iron----Hejet HJ 500-S Heatgun----DM4070 Digital LCR Meter----Propane Torch

7th September 2011, 04:17 AM	#3
seankane diyAudio Member Join Date: May 2010 Location: Washington State	It also looks like but hard to tell because the flash from your camera on the board that your driver transistors for the power supply are burned. I cant tell for sure these are board location Q2, Q3, Q4, Q5. These will have markings of 1A or 1AM and the others will be a 2A. The 1A or 1AM will be part number: MMBT3904 The 2A will be part number : MMBT3906 Does the amp power on or produce audio? __________________ Pyramid 46 Amp Power Supply----Fluke 787 Processmeter----Tektronix 465 Scope----Velleman HPS40 Scope----Soldering Iron----Desoldering Iron----Hejet HJ 500-S Heatgun----DM4070 Digital LCR Meter----Propane Torch

7th September 2011, 05:00 AM	#5
cebby diyAudio Member Join Date: Sep 2011 Location: Western PA	More pics I took more shots of the business end...sort of a walk-around and a few close ups at the end. Pic 1 Pic 2 Pic 3 Pic 4 Pic 5 Pic 6 Pic 7 Pic 8 Pic 9

7th September 2011, 05:32 AM	#6
seankane diyAudio Member Join Date: May 2010 Location: Washington State	What do you have for tools and test equipment? Sounds like you have a partial power supply failure. At this point I would rebuild the whole power supply. Do you at least have a multimeter? __________________ Pyramid 46 Amp Power Supply----Fluke 787 Processmeter----Tektronix 465 Scope----Velleman HPS40 Scope----Soldering Iron----Desoldering Iron----Hejet HJ 500-S Heatgun----DM4070 Digital LCR Meter----Propane Torch


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7th September 2011, 04:44 AM	#4
cebby diyAudio Member Join Date: Sep 2011 Location: Western PA	Amp powers on, but the power LED is dim compared to my other working Punch amps. No audio.

7th September 2011, 05:48 AM	#7
cebby diyAudio Member Join Date: Sep 2011 Location: Western PA	Yes, I have a Fluke 115 multimeter, various soldering irons, etc. No scopes or anything like that though.

7th September 2011, 07:13 AM	#8
seankane diyAudio Member Join Date: May 2010 Location: Washington State	Set your meter in ohms with the range on auto and measure the rsistance between the gate and source legs of all 4 power supply fets. That would be leg 1 and 3 looking at the fet from left to right, what do you get? The board location of these fets is Q10,Q11,Q6,Q7 Next measure the gate drivers resistance the little smd resistors marked 510 what do you get? These are 51 ohm and should read somewhat close to that. The board location of these resistors is R31,R36,R32,R37 __________________ Pyramid 46 Amp Power Supply----Fluke 787 Processmeter----Tektronix 465 Scope----Velleman HPS40 Scope----Soldering Iron----Desoldering Iron----Hejet HJ 500-S Heatgun----DM4070 Digital LCR Meter----Propane Torch

7th September 2011, 07:15 AM	#9
seankane diyAudio Member Join Date: May 2010 Location: Washington State	Post your results then we will check the gate drive voltage of the power supply fets. __________________ Pyramid 46 Amp Power Supply----Fluke 787 Processmeter----Tektronix 465 Scope----Velleman HPS40 Scope----Soldering Iron----Desoldering Iron----Hejet HJ 500-S Heatgun----DM4070 Digital LCR Meter----Propane Torch

7th September 2011, 01:58 PM	#10
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	As a side note... On this site (and others), if you type anything that would take more than 1 minute to re-type, highlight the text and copy it to the clipboard (ctrl-c or right-click and select copy) before clicking anything that will move you from the page where you typed it. It's happened to me so many times that I always do this for long posts. __________________ 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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