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Old 27th September 2011, 09:56 PM   #1
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Default Precision Power pc450 Fixable?

It looks like Q3, Q62, and R174 are all burned, If those three are replaced is it likely it will work? Or is there probably other issues? Where can I find these pieces. Thank for any help you may have. Q3 and Q62 both say SEC, 529 IRFZ44 on them.

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Old 28th September 2011, 12:18 AM   #2
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It's likely repairable, assuming that the transformer is not shorted.

You MUST replace all6 of the IRFZ44s. You can get them from Mouser or Digi-Key.

You also need to check the output transistors.

If you haven't done so, you need to read the basic amp repair page (link in sig line below).
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Old 28th September 2011, 10:54 PM   #3
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Thank you for the info.
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Old 3rd October 2011, 09:10 PM   #4
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I replaced all 6 IRFz's and the 3 burned diodes on the lower side in the picture. The front channels work great but not getting and sound from the rears. Any suggestions?
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Old 3rd October 2011, 09:31 PM   #5
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With speakers connected, did you try operating all pots and switches through their entire range to see if the amp ever produced audio?
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Old 4th October 2011, 12:03 AM   #6
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Upon further testing the other channels do work when the xover freq. is turned all the way up. Its not as loud as the other channels but it does have sound.
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Old 4th October 2011, 12:34 AM   #7
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Gains?

-12db switch?
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Old 4th October 2011, 12:43 AM   #8
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Yes I adjusted both gains, and turned -12 on and off. Now that I think about it, Im going to try a different set of RCAs.
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Old 4th October 2011, 11:34 PM   #9
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After I said RCA's I realized this is not s left/right issue, but a front back so that cant be it.

Ok so I spent my lunch today really looking at it. So everything on the amp works, Its just that the front 2 channels are a lot quieter then the rears. You have to have the xover freq. turned all the way to the right to get sound out of the front channels. I would say they are 1/3 rd as loud as the rear two channels, and that is with the gain all the way up.

What most likely causes an issue like this?
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Old 4th October 2011, 11:56 PM   #10
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Do you read ~20 ohms of resistance between the input RCA shields of all 4 of the channels?

No RCAs connected.
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