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Kicker cxa300.4 low audio issue
Kicker cxa300.4 low audio issue
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Old 15th June 2019, 05:25 PM   #1
rhempz01 is offline rhempz01  United States
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Default Kicker cxa300.4 low audio issue

I now have a kicker cxa300.4 that has rail, and regulated voltage. Powers up fine, and draws @1 amp of current. Plays audio very low even at max gain. I been searching around for damaged components and can not seem to find the culprit. Some help would be most welcome.
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Old 15th June 2019, 05:27 PM   #2
rhempz01 is offline rhempz01  United States
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Topside of pcb
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Old 15th June 2019, 05:28 PM   #3
rhempz01 is offline rhempz01  United States
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Bottom side of pcb
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Old 16th June 2019, 12:12 AM   #4
barber02 is offline barber02
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On the bottom side of the PCB on the top edge of the board about in the middle of your tweezers I see what looks like a broken trace or bad solder joint.
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Old 17th June 2019, 06:02 PM   #5
PapaZBill is offline PapaZBill  United States
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Possible muting issue.

First check if any DC voltage between Power & Speaker Ground. If so check resistance between same. If Open check for open traces and RP87-0 ohm resistor. You may recall previous threads I've brought this up Rhempz01. This is a very common issue.

If that's not it check the DC voltages at the PWM daughter board pins and post. Starting on either side of the board and label Pins 1 through 13.

The muting circuit uses a C945 JFET at the input to each channel. One by One remove Q19 through Q22 to see if the mute clears and isolates to one channel
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