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Old 2nd July 2012, 12:30 AM   #1
Jatruh is offline Jatruh  United States
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Location: Florida
Default Need Help with another Kicker 04kx1200.1

Hey guys, Thanks in advance to all the guru's for looking and hopefully helping out. I just received a Kicker 1200.1 and it doesn't have any sound output. Yes, I've been researching and testing to no prevail for the past 5 days before joining and posting. Perry, you seem like the go to guy on these amps. I hope you can help.

So I powered it up, no protect lights powers up fine but no output. it looks as though the relay on the output side isn't latching/ or turning on? I believe it is stuck in that position to prevent a bad signal output? Nothing in this amp is burnt, blown or has any signs that it is bad... I check the rail voltage, the TL484C and from all the other threads I've read they are fine.

So, here I am hoping for some guidance. I've fixed a lot of minor amp issues, like rca's, burnt traces, etc... but never been this deep into one before. Any help would be greatly appreciated. Thanks again.
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Old 2nd July 2012, 05:07 AM   #2
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Do you have a scope?

Does the relay ever click?

Red or green circuit board?
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Old 2nd July 2012, 11:21 AM   #3
Jatruh is offline Jatruh  United States
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No scope, just a dmm.

The relay never clicks.

It's the red board.
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Old 2nd July 2012, 11:24 AM   #4
Jatruh is offline Jatruh  United States
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Sorry, I previously made an error in my earlier post on the TL484C, it's a TL494C.
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Old 2nd July 2012, 11:13 PM   #5
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With the black meter probe on the negative speaker terminal. is there any significant DC Voltage on either terminal of either of the output filter inductors as the amp is powered up?

If you drive a strong signal into the amp, do you read any AC voltage on the same point?

Do this with all FETs clamped tightly to the heatsink.

You stated that the rail voltage was OK. What was the rail voltage?
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Old 3rd July 2012, 10:26 PM   #6
Jatruh is offline Jatruh  United States
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Hello Perry, Sorry for the delay...

Hopefully, I tested the right components. Like I said I've never dove into an amp before other than loose RCA's and traces. But here's what I got when I tested component:
L107
+2.3v AC was the highest reading on this component +1.7v was consistent with 2v preouts
On the other 2:
L105 & L106
+1.7v on the inside pins and the outside pins it seemed as tho my meter didn't have a high enough setting. Now when i removed the probe from the pin I would get weird readings as high as 777v Ac but every time I stuck the probe on and off I would get different readings. It's just a cheap CEN-TECH 98025, I should have brought my good one from work home.

The readings I got on the rail with a input of 13.7v DC from my power supply were:
13.3v and also 68.4v DC

Thanks again for your help and have a great Holiday.
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Old 3rd July 2012, 11:12 PM   #7
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What is your 'good' meter?
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Old 3rd July 2012, 11:35 PM   #8
Jatruh is offline Jatruh  United States
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It's from Matco I believe it's a Bluepoint. I paid like $100-150 about 10 years ago.
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Old 4th July 2012, 01:56 AM   #9
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Try measuring again with the other meter.
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Old 4th July 2012, 09:58 PM   #10
Jatruh is offline Jatruh  United States
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Ok found another meter, it's not the bluepoint but it's not a cen-tech either. It's a craftsman. I believe it's reading tho... I have the gain set at around 3/4 on the amp and now I'm reading up to 120's AC on the L105 & L106 outside pins and around half or less on the inside pins. I am also getting around the same 50-60 volts ac on the L107 pins. they all fluctuate with the volume up and down.
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