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Old 13th February 2009, 02:47 AM   #1
chipper is offline chipper  United States
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Default I need help with blown kicker ZR240!

The power supply FETs are blown. I looked up the part numder on digikey's web site and they sell them for $2 a piece. If i get those transistors will the amp power on or still fry up again? I chekced everything else it's just those transistors that are burn't up.

Please help!
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Old 13th February 2009, 03:40 AM   #2
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You need to check the output transistors. They often short and cause the power supply to fail. If they're shorted, the new transistors may fail when the amp is powered up.

You also need to check the gate resistors for the power supply FETs. After you remove the PS FETs from the board, measure the resistance of the (47?) ohm resistors that were connected to the first leg of the PS FETs.
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Old 13th February 2009, 04:35 AM   #3
chipper is offline chipper  United States
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Quote:
Originally posted by Perry Babin
You need to check the output transistors. They often short and cause the power supply to fail. If they're shorted, the new transistors may fail when the amp is powered up.

You also need to check the gate resistors for the power supply FETs. After you remove the PS FETs from the board, measure the resistance of the (47?) ohm resistors that were connected to the first leg of the PS FETs.

There's only one resistor right next to the goldish pwer conductor. The colors are Gold, Black, Blue, Bage (?)

Thanks for the reply!
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Old 13th February 2009, 04:56 AM   #4
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That's probably part of the snubber. The colors are probably yellow, violet, black, gold.

The gate resistors are going to be surface mount components. They will likely have 470 printed on them. They will be connected by a small trace to the first leg of the power supply FETs. There will be 1/FET. Check all 4 of them. They should be within 5% of the printed value.
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Old 13th February 2009, 04:59 AM   #5
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Just curious if you have any spare crossover modules? or where you can still buy them?
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Old 13th February 2009, 09:14 PM   #6
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Flea-bay usually has one or two vendors selling them. If not I have a complete set of input modules I doubt that I will be using much as I just used them to test repaired Kicker amps over the years.. Email me if you can't find them easily on the auction site....
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