Rockford Punch 200.2 one channel down?

dhamia · 2nd November 2012, 10:36 PM

Hi
I picked up a Punch 200.2 today and found only one channel works, the other just pushes the speaker cones out.

Also it won't run bridged.

I have found 3 failed IRF540's anr r268, r252 and r280 ave failed.

I have ordered the IRF540's but I can't make out the values of the resistors listed above.

My questions are,

Can anyone tell me the resistor values ?

Should I check/replace any other components on the faulty channel?

I have shown the defective items in the image below

Thanks in advance

dhamia · 2nd November 2012, 10:38 PM

I pulled the 3 IRF540's and the failed channel now makes sound , albeit low and distorted.

Perry Babin · 2nd November 2012, 10:55 PM

Re-check the 540s that you removed. Are all 3 shorted? It's likely that only 1 is shorted.

dhamia · 3rd November 2012, 02:19 AM

Yes you are right Perry, only 1 was shorted.

3 appeared to be whilst in situ but when removed
Only 1 was actually shorted.

Perry Babin · 3rd November 2012, 02:49 AM

Reinstall the two good ones and check the gate resistors for the two locations where you install them. Clamp all FETs and power up the amp through a 10 amp fuse. Does it produce clean audio from that channel?

seankane · 3rd November 2012, 02:56 AM

If it were me I would replace all the outputs in the defective channel, and dont forget to check the source resistors. I rarely see the gate resistors fail, I have a parts 200.2 and will post the values of the resistors you need.

However the protection circuit components can fail.

seankane · 3rd November 2012, 03:00 AM

R252, R268, R280 are all gate resistors for the 3 IRF540 outputs. I rarely see them fail but they are a smd 0805 package 10 ohm resistor.

dhamia · 3rd November 2012, 06:08 PM

I have re-installed the two good ones and it still sounds the same,
It also blew the 10 amp fuse on one occasion.

dhamia · 3rd November 2012, 06:10 PM

The gate resistors still measure the same

Perry Babin · 3rd November 2012, 09:43 PM

Do you have an oscilloscope?

How much current does it draw at idle (no speakers and no RCA input)?

Does it draw excessive current if you set the bias pots fully counter-clockwise?

What are you using for a power supply?

2nd November 2012, 10:36 PM	#1
dhamia diyAudio Member Join Date: Jul 2010	Rockford Punch 200.2 one channel down? Hi I picked up a Punch 200.2 today and found only one channel works, the other just pushes the speaker cones out. Also it won't run bridged. I have found 3 failed IRF540's anr r268, r252 and r280 ave failed. I have ordered the IRF540's but I can't make out the values of the resistors listed above. My questions are, Can anyone tell me the resistor values ? Should I check/replace any other components on the faulty channel? I have shown the defective items in the image below Thanks in advance

2nd November 2012, 10:55 PM	#3
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Re-check the 540s that you removed. Are all 3 shorted? It's likely that only 1 is shorted. __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

3rd November 2012, 02:49 AM	#5
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Reinstall the two good ones and check the gate resistors for the two locations where you install them. Clamp all FETs and power up the amp through a 10 amp fuse. Does it produce clean audio from that channel? __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

3rd November 2012, 02:56 AM	#6
seankane diyAudio Member Join Date: May 2010 Location: Washington State	If it were me I would replace all the outputs in the defective channel, and dont forget to check the source resistors. I rarely see the gate resistors fail, I have a parts 200.2 and will post the values of the resistors you need. However the protection circuit components can fail. __________________ Pyramid 52 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

3rd November 2012, 03:00 AM	#7
seankane diyAudio Member Join Date: May 2010 Location: Washington State	R252, R268, R280 are all gate resistors for the 3 IRF540 outputs. I rarely see them fail but they are a smd 0805 package 10 ohm resistor. __________________ Pyramid 52 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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2nd November 2012, 10:38 PM	#2
dhamia diyAudio Member Join Date: Jul 2010	I pulled the 3 IRF540's and the failed channel now makes sound , albeit low and distorted.

3rd November 2012, 02:19 AM	#4
dhamia diyAudio Member Join Date: Jul 2010	Yes you are right Perry, only 1 was shorted. 3 appeared to be whilst in situ but when removed Only 1 was actually shorted.

3rd November 2012, 06:08 PM	#8
dhamia diyAudio Member Join Date: Jul 2010	I have re-installed the two good ones and it still sounds the same, It also blew the 10 amp fuse on one occasion.

3rd November 2012, 06:10 PM	#9
dhamia diyAudio Member Join Date: Jul 2010	The gate resistors still measure the same

3rd November 2012, 09:43 PM	#10
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Do you have an oscilloscope? How much current does it draw at idle (no speakers and no RCA input)? Does it draw excessive current if you set the bias pots fully counter-clockwise? What are you using for a power supply? __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

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