Question about Kicker ZX400.1 Car Audio Amplifier

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I have a zx 400.1 kicker amp that goes into protection.

I tested the mosfets by testing the resistance and determined 2 were not corresponding to the other 4 so i removed the 2 and when tested the amp powered on and played but sounded a little distorted but that could also be my test speaker.the amp went into to protection if turned up the bass up too much.It could however handle full gain with no bass. when i replaced the 2 mosfets the amp went back into protection again. remove them and it comes on again. Does anyone know what i should test next or where i might find a schematic for this amp. thanks for any help

Posted by Anonymous on

6 Suggested Answers

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Posted on Jan 02, 2017

GARYDALE
  • 15 Answers

SOURCE: Kicker DX350

it sounds like you pop the power Reg. transistor or one of the Amp. chips instide. Some Amps has a pic fuse inside on the main board its green very small shape like a tear drop with a wire comeing out both ends it would in a socket some times white or black.

Posted on Sep 22, 2006

SOURCE: Kicker ZX 750.1

I figured it out!!! Thank yopu for responding though. I had a weak graound signal:)

Posted on Apr 21, 2008

  • 631 Answers

SOURCE: Kicker KX800.4 Protection light problem

If the voltage is sufficient on the B+ and remote terminals and the amp goes into protect with no speaker wires or RCAs connected to the amp, it probably has shorted output transistors.

Let me know if you have any other questions.

Posted on Oct 15, 2008

fixerdlt1
  • 18 Answers

SOURCE: kicker zx 1000.1 green light flickers and no sound

The first thing I would suggest is to check all connections to the amp and speakers, especially the ground. A loose ground can cause the problem listed. You can test this by temporarly running a ground from the amp to the battery neg. . If the amp fires up ok then that means your grounding point for the amp should be checked and cleaned and reattached firmly. If you have a meter(multitester) set it to ohms and check the impedances of the voice coils in the woofers. If one is cooked it may be shorted and tripping the amps protection. Always hook thing up with the sys off and then turn on and test.

Posted on Jul 22, 2009

  • 2 Answers

SOURCE: cut out

check your ground always bring your ground to the battery

Posted on Feb 18, 2010

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Hello newwithtech,

There are 4 possible causes for the amp to go into protection mode. Kicker calls it SORT for Short, Overvoltage, Reverse polarity, and Thermal. If the amp has been in and working properly, it's probably not reverse polarity. And if it goes immediately into protection when power is connected, I'd rule out thermal. So it's probably either a short or overvoltage.

1) Start by removing the speaker wires and see if the amp powers up properly. If it does, one or more of the speakers is shorted or grounded.

2) Test each pair of wires with a multimeter set to the lowest resistance (ohms) scale. Measure across each pair and from each individual wire to ground. Across each pair, the meter should read about 3-4 ohms. From each individual wire to ground, it should read infinity. If the meter reads "0" ohms (shorted) in any test, you have located the problem.

3) If the speaker wires test OK, set the meter to read DC volts and measure the voltage at the amp positive terminal. If the voltage is higher than 16V or lower than 9V, you've located the problem.

4) If the voltage is OK, remove the RCA inputs and test for proper power up. If it powers up without going into protection, you have a shorted/grounded input. Replace them one at a time to determine which one(s) is/are defective and replace the cable.

If these tests show all the wiring is good and the voltage is OK, the amp is probably shorted internally (most likely an output MOSFET), and requires service at the component level. You need to take it to your local audio shop or send it to Kicker for repair.

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