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Kicker kx800.1 no output troubleshooting.
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Old 4th March 2019, 10:37 PM   #11
rhempz01 is offline rhempz01  United States
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The input board is what I also suspected from the beginning. I fixed most of the soder joints as best I could but it's still very bad. I can try to signal trace it back. I know that it doesn't reach the output just. C101,102 or C202 are missing. Alot of the capacitors or resistors are bad either I cant get a reader or soder the ends anymore they are missing the solder caps.? C205 is a value I need.

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Old 6th March 2019, 05:50 PM   #12
PapaZBill is offline PapaZBill  United States
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C101,102 and C202 are not populated. C205 is a 22pF.

I tried to post a picture of input board but not having any luck. I will try again later tonight.
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Old 6th March 2019, 06:08 PM   #13
rhempz01 is offline rhempz01  United States
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I have a friend that has one of these amplifiers he is going to let me use it to repair this one. I will be able to directly check the board vrs mine until it functions as intended.
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Old 6th March 2019, 06:10 PM   #14
Perry Babin is offline Perry Babin  United States
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If you don't have one, get a Dr. Mom otoscope from walmart to examine the tiny traces on the board, if any are corroded.
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Old 6th March 2019, 11:50 PM   #15
PapaZBill is offline PapaZBill  United States
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Excuse the picture quality, I was in a bit of a hurry.
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Old 14th March 2019, 12:48 AM   #16
rhempz01 is offline rhempz01  United States
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Got the input board working. Replaced almost everything. Anyway, now when i turn the amplifier off there is an audible thump coming through the subwoofer. What would be causing that?
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Old 14th March 2019, 01:54 AM   #17
PapaZBill is offline PapaZBill  United States
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There may be an issue with the muting circuit. Check around Q19,Q20,Q21. The header pins near Q19 look to be damaged.

It occurred to me you had a good input board from a friend. If when testing with that board, do you have the same turn off pop?
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Last edited by PapaZBill; 14th March 2019 at 01:59 AM.
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Old 19th March 2019, 03:17 PM   #18
rhempz01 is offline rhempz01  United States
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Everything in that area looks good and is now touched up. Zd9 seems to be not functioning properly.
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Old 19th March 2019, 03:39 PM   #19
rhempz01 is offline rhempz01  United States
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What transistors can be used in place of the three in the muting curcuit. I'll replace them and see if that helps.
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Old Yesterday, 09:28 PM   #20
PapaZBill is offline PapaZBill  United States
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Apologize for the late reply. Any general purpose transistor will do for testing. Just be sure to account for pin outs and polarity.

The BC807 and BC817 can be found through Mouser.

Where you able to use the known good board from your friend to isolate the problem to the input or main board?
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