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Old 6th January 2009, 03:12 AM   #1
chipper is offline chipper  United States
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Default I need help with a Kicker DX700

It's a class D amp. the Gain control is broken off. I had bought it like that from ebay for $10. (haha) everything else is fine none of the mosfets are burned or nothing. just the Gain control. when i hooked it up it made a screaching loud sound so i turned it off quick. Any know the Value for that Gain control part? i have a broken DX350 that has burned MOSFETs i thought i'd take of that gain control and put it on there. Would that work? It's a 100k varial resistor trimmer knob believe. I wanted to take it to school to have my electronics teacher have a look at but im still on "vacation" :(. Please help me! thanks
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Old 6th January 2009, 12:01 PM   #2
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Hi,
No problem to replace the broken pot with the one from the other amp...

Any value between 10k and 100k will do the job.

No risk at all, believe me !

Have a nice day.

Vacations are ending for me...
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Old 7th January 2009, 12:31 AM   #3
chipper is offline chipper  United States
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Thanks for the reply. I unsolder off the pot and connected it on nd when i hooked up the radio to it. The sound sounded really horrible with alot of "hissing" and scrathing noises. It still played music but with bad sound. Any ideas if i did it right? thanks
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Old 7th January 2009, 06:21 PM   #4
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Hi,
Strange behaviour, a trim pot cannot bring distorsion...

input signal--------P
------------------O-----------output signal
ground -----------T


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Old 8th January 2009, 07:42 PM   #5
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Hi Chipper,

Your gain control circuit has a 4 pin header and the pot value is 10K. You should short circuit the 3-4 pins and connect the one end of the pot to this point. The mid point of the pot goes to pin 2 and the other end of pot goes to pin1.
And hence you did the original replacement of the gain control circuit. If you cannot understand the which pin is pin 1 and which is pin 4 you can make a basic test. Energize the amp and turn it on you must measure +15V from pin 1 to pin 3 and actually the pin 1 is on the left or right side of the header(If you have the male side of header the color is black for pin 1).

I hope, I could tell what I mean. Your amp use HIP4080 driver and HUF75693G3 mosfets for output.

Regards
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Old 8th January 2009, 07:45 PM   #6
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Oh sorry, I have forgotten to say! yes the gain control module of DX-350 is one to one replacement of DX-700( they are same).
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