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Kicker cxa300.1 help please
Kicker cxa300.1 help please
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Old 9th February 2019, 09:59 PM   #1
jayjs730 is offline jayjs730
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Default Kicker cxa300.1 help please

Hello I would appreciate it very much for some help on this amplifier .I replaced power transistors,audio ,gate resistors and rectifiers.
ITS still stuck in protect mode ,only one rectifiers is getting power and resistor r105 pops soon as power is applied.[
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Old 9th February 2019, 10:50 PM   #2
PapaZBill is online now PapaZBill  United States
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R105 4.7 ohm resistor is the B+ for IC3-18021 gate driver. The Pins 1 and or Pin 2 is shorted and causing R105 to burn up. This is fairly common when the power supply fails. Replacing IC3 will most likely fix the problem.

Once you have everything replaced, IC3, Gate resistors 33 ohm resistors, etc and before you install the PS mosfets-AOT460's, remove R68-4.7Kohm and power the amp. Check the gate pads for drive with a scope if possible or voltmeter. Post screenshots or voltages readings.
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Old 9th February 2019, 10:55 PM   #3
jayjs730 is offline jayjs730
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Thank you so much I highly appreciate your help .I asked Perry but he said hes not familiar with this board.So you are a life saver I will let you know how I make out,Jeremy
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Old 10th February 2019, 02:15 AM   #4
PapaZBill is online now PapaZBill  United States
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Check your PM, I found the MP18021 at Mouser.
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