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Kicker ZX750.1 Shutting down at high volume
Kicker ZX750.1 Shutting down at high volume
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Old 15th June 2018, 02:06 AM   #1
Tom7227 is offline Tom7227  United States
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Default Kicker ZX750.1 Shutting down at high volume

I am having an issue with this Kicker Amp,

The complaint is that the amp was cycling in/out of protection at high volume. (35-40 amp draw)

I am able to confirm this by looking pulse for shut down, out of Pin 13 of U02 (KIA339).

My theory is that that comparator monitors the 12v incoming line and turn off if its to low.

PapaZ , can you confirm?
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Old 15th June 2018, 03:50 AM   #2
PapaZBill is offline PapaZBill  United States
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I will have to look at schematics and that won't be until Monday.I believe that's right but will need to look at the circuit to refresh my memory about this amp. It's been some time since I've work on this one.

In the meantime post pics of amp.

Also, check the DC voltages around the LM361 and waveforms on Pin 4,9 and 11 and list readings and post screenshots. Check DC voltages from Source to Gate on the IRF640's and IRF9640's and check the drive waveform to the Gates and output inductors. You will only need to check one output devices for each bank.

It's not necessary to attach a load or apply audio or test tone. I just won't to see the idle conditions. You may need to remove the preamp board.
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Old 18th June 2018, 12:50 AM   #3
Tom7227 is offline Tom7227  United States
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Here is the information you requested,

Lm 361

4: .04
9: .09
11 :56

Attached are the images you requested.

Note the capacitors that appeared overheated. I did replace them. It appears that it may have corrected the problem. But I am unsure, as I need to test more.
Attached Images
File Type: jpg Kicker 750.jpg (992.5 KB, 46 views)
File Type: jpg Pin 4.JPG (274.2 KB, 47 views)
File Type: jpg Pin 9.JPG (293.4 KB, 47 views)
File Type: jpg Pin 11.JPG (268.8 KB, 48 views)
File Type: jpg Vented.jpg (988.3 KB, 45 views)
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Old 18th June 2018, 03:26 PM   #4
PapaZBill is offline PapaZBill  United States
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Looking at your last post, the Class D circuit appears to be working.

If the caps you pulled are vented as you say, replacing them may have fixed the issue. Which caps did you replace?

The KIA339 is the looking at B+ and shuts down the TL494 when there is a overvoltage,undervoltage or thermal event.
In this case undervoltage protection.
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Old 19th June 2018, 12:29 AM   #5
Tom7227 is offline Tom7227  United States
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C158 C163 C164

They are 10uf @200v, they didn't vent like I see other capacitors do, they may have overheated.

They are located in the center of the board.
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Old 19th June 2018, 02:10 AM   #6
PapaZBill is offline PapaZBill  United States
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They work with L105, L106 to filter out the Class D carrier component.It's possible this has fixed the amp.

Have you had a chance to test amp under load?
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Old 19th June 2018, 02:19 AM   #7
Tom7227 is offline Tom7227  United States
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Not yet, I haven't to use my 100 amp supply and run it. I had to put it aside for the weekend.

I will let you know in a day or so..
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