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dhamia 2nd November 2012 11:36 PM

Rockford Punch 200.2 one channel down?
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 11:38 PM

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

Perry Babin 2nd November 2012 11:55 PM

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

dhamia 3rd November 2012 03:19 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 03:49 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 03:56 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 04:00 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 07:08 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 07:10 PM

The gate resistors still measure the same

Perry Babin 3rd November 2012 10:43 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?

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