Kicker KX1200.1 went up in smoke - diyAudio
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Old 21st March 2010, 08:36 PM   #1
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Default Kicker KX1200.1 went up in smoke

I have no clue why, but i while i was driving the other day playing the radio a little harder than i should and my kicker amp went up in smoke. I have two gel cell batteries and a farad cap. I have 4 12" cvr 2 ohm playing @ 1 ohm. I took the amp apart and i could see right off the bat, there were some fried components, q6-q9 and q12-q15 were toasted (irf3205), so they have been removed from the board. I tested the 8 resistors that sit in front and they all read .100 k ohms, being they are all identical i suppose they are correct. I tested q05 and q11 with the ohm meter, q05=.210 and q11=.209. Is there anything else i should check be4 i order the 8 irf3205?
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Old 22nd March 2010, 02:50 AM   #2
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With the FETs out of the board, measure the DC voltage on the solder pad for the first leg of each of the power supply FETs. They should all read the same (~5-6v). Place the black meter probe on the amplifier's ground terminal. Place the red meter probe on the point where you need to measure the voltage.

Did you check the output transistors (IRF640s and IRF9640s)?
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Old 22nd March 2010, 03:10 AM   #3
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I assume ill have to put the amp back in the car and reconnect power, ground and remote wire.
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Old 22nd March 2010, 04:05 AM   #4
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To measure the DC voltage, you'll have to do whatever it takes to power it up.

You don't need power applied to check the outputs.
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Old 23rd March 2010, 11:54 PM   #5
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r16-r19 measured @ .36 v and q12-q15 @ .83 v. wtf?
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Old 24th March 2010, 12:05 AM   #6
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whats the proper way of testing the output transistors? ohm test or diode?
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Old 24th March 2010, 12:40 AM   #7
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The transistors you needed to check the signal on are in the groups with Q73 and Q83.

For initial testing of the outputs, you can use either setting.
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Old 24th March 2010, 12:45 AM   #8
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are those voltages right?
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Old 24th March 2010, 01:17 AM   #9
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No. The resistors you listed aren't for the power supply transistors (according to the phtos I have to kx1200s). If you were on the wrong resistors, the voltage wouldn't be right.
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Old 25th March 2010, 01:23 AM   #10
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what are the irf3205 for? all 8 were burned up. thats where i tested for voltage because they are removed from the board
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