Rockford Punch 200.2 one channel down? - diyAudio
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Old 2nd November 2012, 11:36 PM   #1
dhamia is offline dhamia  United Kingdom
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Default 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

Click the image to open in full size.
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Old 2nd November 2012, 11:38 PM   #2
dhamia is offline dhamia  United Kingdom
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I pulled the 3 IRF540's and the failed channel now makes sound , albeit low and distorted.
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Old 2nd November 2012, 11:55 PM   #3
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Re-check the 540s that you removed. Are all 3 shorted? It's likely that only 1 is shorted.
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Old 3rd November 2012, 03:19 AM   #4
dhamia is offline dhamia  United Kingdom
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Yes you are right Perry, only 1 was shorted.

3 appeared to be whilst in situ but when removed
Only 1 was actually shorted.
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Old 3rd November 2012, 03:49 AM   #5
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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?
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Old 3rd November 2012, 03:56 AM   #6
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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.
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Old 3rd November 2012, 04:00 AM   #7
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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.
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Old 3rd November 2012, 07:08 PM   #8
dhamia is offline dhamia  United Kingdom
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I have re-installed the two good ones and it still sounds the same,
It also blew the 10 amp fuse on one occasion.
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Old 3rd November 2012, 07:10 PM   #9
dhamia is offline dhamia  United Kingdom
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The gate resistors still measure the same
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Old 3rd November 2012, 10:43 PM   #10
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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?
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