Kicker kx800.1 no output troubleshooting. - Page 2

rhempz01 · 12:02 AM

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.

PapaZBill · 6th March 2019, 06:50 PM

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.

rhempz01 · 6th March 2019, 07:08 PM

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.

Perry Babin · 6th March 2019, 07:10 PM

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.

PapaZBill · 7th March 2019, 12:50 AM

Excuse the picture quality, I was in a bit of a hurry.

rhempz01 · 14th March 2019, 01:48 AM

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?

PapaZBill · 02:59 AM

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?

rhempz01 · 19th March 2019, 04:17 PM

Everything in that area looks good and is now touched up. Zd9 seems to be not functioning properly.

rhempz01 · 19th March 2019, 04:39 PM

What transistors can be used in place of the three in the muting curcuit. I'll replace them and see if that helps.

PapaZBill · 25th March 2019, 10:28 PM

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?

4th March 2019, 11:37 PM	#11
rhempz01 diyAudio Member Join Date: Nov 2016 Location: Milford Delaware	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. Last edited by rhempz01; 5th March 2019 at 12:02 AM.

6th March 2019, 06:50 PM	#12
PapaZBill diyAudio Member Join Date: Oct 2013 Location: Yale, Oklahoma	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. __________________ Any sufficiently advanced technology is indistinguishable from magic. Arthur C. Clarke

6th March 2019, 07:10 PM	#14
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	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. __________________ Anyone who purchased the repair tutorial, email me (babin_perry@yahoo.com) if you want to download the latest version.

25th March 2019, 10:28 PM	#20
PapaZBill diyAudio Member Join Date: Oct 2013 Location: Yale, Oklahoma	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? __________________ Any sufficiently advanced technology is indistinguishable from magic. Arthur C. Clarke

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6th March 2019, 07:08 PM	#13
rhempz01 diyAudio Member Join Date: Nov 2016 Location: Milford Delaware	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.

14th March 2019, 01:48 AM	#16
rhempz01 diyAudio Member Join Date: Nov 2016 Location: Milford Delaware	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?

19th March 2019, 04:17 PM	#18
rhempz01 diyAudio Member Join Date: Nov 2016 Location: Milford Delaware	Everything in that area looks good and is now touched up. Zd9 seems to be not functioning properly.

19th March 2019, 04:39 PM	#19
rhempz01 diyAudio Member Join Date: Nov 2016 Location: Milford Delaware	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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