Kicker zx400.1

[Hexhclass]

Amp goes in protect when input signal is increase. With gain set at different points it will still shutdown when I increase signal from the head unit.
Pulling R94 and d234 one at a time did not make a difference.

Any suggestions?

 

[PapaZBill]

Post pictures of the board with and w/o preamp board. There are several versions of the ZX400.1.

Try lifting R22-22K ohm, then D16.

 

[Hexhclass]

Lift them one at a time no change.

 

[Hexhclass]

With no input signal i see .546mv on the out pin of the pre-amp board.

 

[PapaZBill]

Check the voltage on output pin with black probe on negative speaker terminal.

Also, take pictures of the entire board and preamp board with no glare.

 

[Hexhclass]

Using negative speaker terminal same voltage.

Forgot to mention it’s —546mv

 

[PapaZBill]

Check rail voltages and the +/-12 volt rails on preamp board, Also the VC pin on the preamp board.

Lift D15. I am just going through a process of elimination.

Check the voltage across D231-BZG03C12.

Look for any loose grounding screws and check C40,41,42

post the voltages and use Negative speaker ground for black probe.