I need help with blown kicker ZR240!

chipper · 13th February 2009, 03:47 AM

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!

Perry Babin · 13th February 2009, 04:40 AM

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.

chipper · 13th February 2009, 05:35 AM

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!

Perry Babin · 13th February 2009, 05:56 AM

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.

HIPCHECK · 13th February 2009, 05:59 AM

Just curious if you have any spare crossover modules? or where you can still buy them?

1moreamp · 13th February 2009, 10:14 PM

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....

13th February 2009, 04:40 AM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	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. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

13th February 2009, 05:56 AM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	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. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

13th February 2009, 05:59 AM	#5
HIPCHECK diyAudio Member Join Date: Jun 2004 Location: ARKANSAS	Just curious if you have any spare crossover modules? or where you can still buy them? __________________ If a inch of duct tape will fix it, 3 feet should fix it for life!!!!

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13th February 2009, 10:14 PM	#6
1moreamp diyAudio Member Join Date: Dec 2005 Location: Northern California	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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