kicker zx400.1 goes in to protectuon mode.

rdiaz

Member
2016-06-04 3:04 am
Florida
Hello everyone, I have a kicker zx400.1 with problems, the amp turns on and produces output signal at low gain when I start turning the gain up the amp goes in to protection mode, if I turn the gain down the amp comes out of protection. The amp come in with R108 (270 ohm) and R106 and R107 (220 ohm) burned, I have replaced the resistors and TL074C on input board.
 

rdiaz

Member
2016-06-04 3:04 am
Florida
Here are some pictures of the amp.
 

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I don't recall seeing this on a ZX400.1. I have on other 06ZX mono amps. Take a look underneath the input board you will see a 10uF 160v NP Cap lying down. Inspect it for any punctures from the Gain pot leads. This will cause the amp to oscillate.If this is the case, trim the leads and add a thin sheet of cardboard to add more insulation. You want to replace cap, but may not be necessary.

Let me know what you find. There may be other issues.
 
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rdiaz

Member
2016-06-04 3:04 am
Florida
I have check the areas you mentioned and everything is ok there, looks like on this model the raise the input board or they used different caps. I have noticed if I let the amp running for small period of time I can turn the gain higher almost to clipping point. I tried changing the level with signal source and is doing the same, I'm doing this without load connected.
 
The LM393 is the comparator for the OCP over current protection, If the IC fails it would most likely shut down the amp. If replacing the IC does not correct the problem, check for cold solder, resistors out of value etc

Also check that D231-BZG03C12 12 volt zener is not out of value.
 
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