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KIcker CXA1200. 1, high to low volume
KIcker CXA1200. 1, high to low volume
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Old 15th September 2019, 03:56 AM   #1
rhempz01 is offline rhempz01  United States
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Default KIcker CXA1200. 1, high to low volume

So I just been asked x2?now if I can fix an issue with a cxa1200. 1. Volume going from high to low over and over? Would this be some sort of failer with the muting curcuit? Or something else. Just wondering if this has even been heard of by anyone else.
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Old 16th September 2019, 12:10 AM   #2
PapaZBill is online now PapaZBill  United States
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Has the amp been bench tested? It's possible that there may be a problem with the install.

If the amp is at fault it's had to say until you get into it and check the usual such as rail and housekeeping voltages and if the protection LED is flashing, etc...
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Old 16th September 2019, 08:19 PM   #3
rhempz01 is offline rhempz01  United States
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rail present
regulated is ok +-15 on all opamps as well.
protection is flashing on and off.
c139 value. when pulling bbn it out of the sink its grounded and its most likely damaged.

Last edited by rhempz01; 16th September 2019 at 08:30 PM.
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Old 17th September 2019, 01:12 AM   #4
PapaZBill is online now PapaZBill  United States
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"c139 value. when pulling bbn it out of the sink its grounded and its most likely damaged."

I'm not sure what you mean to say. Is the capacitor shorted? If still in circuit pull it out and recheck. C139-820 picofarad and R172 are across Q104-IRFB3307Z. If Q104 is shorted it will cause the amp to toggle in and out of protection.
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Old 17th September 2019, 01:30 AM   #5
rhempz01 is offline rhempz01  United States
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its not shorted and tests ok.
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Old 17th September 2019, 01:38 AM   #6
rhempz01 is offline rhempz01  United States
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i can pull all the outputs and check them to be sure.
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Old 17th September 2019, 01:48 AM   #7
rhempz01 is offline rhempz01  United States
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all rechecked and test good.
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Old 17th September 2019, 02:43 AM   #8
rhempz01 is offline rhempz01  United States
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this is the revision i have. still just flashing bbn in and out of protection?
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Old 17th September 2019, 05:28 PM   #9
PapaZBill is online now PapaZBill  United States
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Check R173,174,273,274-16 ohm and R175-27 Ohm.

Check D33 and D34-1N4148. If both look OK, leave one out at a time to see if amp comes out of protection.It's possible disabling the output protection will cause a pair of the aforementioned resistors too burn. This will not damage the board and is a good way to determine if one amp of the H bridge has failed,usually a couple of capacitors has failed in the Feedback loop. Another alternative is to remove all five resistors and check for oscillation on one speaker terminal, after the output filter.
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Old 17th September 2019, 08:38 PM   #10
rhempz01 is offline rhempz01  United States
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All thise resistors test good as well as those diodes. Lifting each one of the 4148's did not bring the amp out of protection. still just flashing.
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