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My kac 6401 amplifier has two fkv 550 transistors burned. Can i use other similar transistor to replace this ones?

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You should be able to purchase the correct parts at pacparts.com.

Posted on Mar 22, 2011

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Stuck in protection mode tried everything voltage good wires good ground good open/close button dosen,t help me at all love amp please help


everything you've tryed is useless(with respect) because amp has shorted output transistors one or more and amp is in protection mode to protect your amp from further damage.take it to repair shop or try to locate blown transistor yourself.good luck

Dec 10, 2010 | Kenwood KAC-X401M Car Audio Amplifier

1 Answer

Solve Your ''kenwood kac x40m problems'' Problem Now! the operation protection light is on never goes off subs dont work what do i do


your amp output transistors are shorted and protection is activated to protect your amp from bigger damage.if you are confident you can try to open the amp and you should see some burn marks or burnt(blown) transistor and just simply replace him.or take it to repair shop

Mar 21, 2010 | Kenwood KAC-X401M Car Audio Amplifier

1 Answer

I have a rockford fosgate 550 that the fuse blows


Short inside one of the transistors. This requires very good soldring skills and electrical know-how, and some thermal paste to go between the heat-sink and the transistor. Unfortunatly this is not a cheap repair, probably cost around 100 dollars.

Cheers,

Kevin

Feb 09, 2010 | Rockford Fosgate Punch P550.2 2-Channel...

1 Answer

ZX-8100


I'm not familiar with that particular amp but generally, the only transistors that burn are the ones in the power supply. If the adjacent transistors had numbers like IRFZ44, IRF3205 or similar, the burned transistor is likely the same as the ones next to it.

Confirm that the center and right-most leg of the burned transistor and the transistor next to it are directly connected by large traces on the circuit board. Also confirm that the center leg goes to the large windings of the power transformer. If it passes these tests, the transistor is one of the power supply FETs. The numbers on the adjacent (parallel connected) parts will be the same as the burned one.

Jul 16, 2008 | Volfenhag ZX-8200 Car Audio Amplifier

3 Answers

Kenwood KAC-8103D 1000 watt issues


The speaker may have shorted and caused the output transistors in the amp to fail. This is fairly common. It can be repaired.

May 14, 2008 | Kenwood KAC-8103D Car Audio Amplifier

1 Answer

NAD C350


Take a ohm meter and measure resistance from emiter to collector should have a few kilo ohm on output transistor.
If no ohm meter available , remove output transistors from circuit.
note position of transistor . you have a NPN and a PNP for each channel.
Replace fuse and power up. If fuse blows check bridge in the power supply.

80% of the time output transistor burn and blow the fuse.
before replacing output transistors check driver transistors they probably burnt also

Apr 29, 2008 | NAD C350 2-Channel Amplifier

1 Answer

Kac-8404 100w amp


What are the numbers on the transistors?

Jan 06, 2008 | Kenwood KAC-8401 Car Audio Amplifier

4 Answers

I turn on the amp then the fuse blows??


If the fuse only blows after the remote voltage is applied, the amplifier probably has shorted output transistors.

Dec 01, 2007 | Kenwood KAC-X401M Car Audio Amplifier

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