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Kicker CX1200. 1 no current draw, no output.
Kicker CX1200. 1 no current draw, no output.
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Old 15th May 2019, 09:27 PM   #1
rhempz01 is offline rhempz01  United States
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Default Kicker CX1200. 1 no current draw, no output.

I have a CX1200. 1 and I'm not sure if they are the same curcuit as the cxa1200. 1 and needs the voltage ladder repaired or not. So I could use some guidence on getting this amplifier functioning properly again.
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Old 15th May 2019, 09:29 PM   #2
rhempz01 is offline rhempz01  United States
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Topside.
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Old 16th May 2019, 06:01 PM   #3
PapaZBill is offline PapaZBill  United States
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The CX and CXA are the same amp. The CXA has a microcontroller that replaces IC17-LM339.

Both use the same ladder circuit. If the amp has rails including the +/-15 volts, check for drive and look at the ladder circuit. +12v/+24v/+12v.
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Old 16th May 2019, 08:31 PM   #4
rhempz01 is offline rhempz01  United States
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Regulated +-15 is not present. No rail voltage. If I probe for voltage at pin 3 of ic16 the amplifier starts making drive and drawing current?

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Old 17th May 2019, 02:49 AM   #5
PapaZBill is offline PapaZBill  United States
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Not sure what's happening with IC16, but start by removing the power supply mosfets,and
measure the DC voltage around the UC3843 using power ground for the black probe. And probe pins 4 and 6 of the 3843 and post results and screenshots.

Once you can establish the rails and +/-15 volts, then we will look at ladder circuit and PWM for output drive.
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Old 17th May 2019, 12:59 PM   #6
rhempz01 is offline rhempz01  United States
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Cap it is cracked (c4) most likely the issue I saw it under a magnification. Do you know it's value?
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Old 17th May 2019, 01:00 PM   #7
rhempz01 is offline rhempz01  United States
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Photo of possible issue.
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Old 17th May 2019, 01:42 PM   #8
PapaZBill is offline PapaZBill  United States
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If you look closely you will see that C4 is in fact C47-2nF. C47 and R9-18Kohm are the RC time constant for the UC3843.

This may have damaged the mosfets and Q5-C2045. The safe bet is to replace mosfets and driver along with C47.

Before you replace the mosfets and after you've replaced C47 and Q5. Check the Sawtooth on U16- Pin 3 and drive from pin 6 to the gate resistors.

Whenever replacing timing capacitors always use caps rated COG(NPO), the following Mouser link will work for C47.

C0402C202J3GACTU KEMET | Mouser
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Old 17th May 2019, 05:03 PM   #9
rhempz01 is offline rhempz01  United States
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I have them. And I replaced it and now have drive, rail, and regulated voltage. And output is clean, it started as these amplifiers should.
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Old 17th May 2019, 06:11 PM   #10
PapaZBill is offline PapaZBill  United States
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Yep, fairly common problem!
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