Kicker KX1200.1 went up in smoke

phil33875 · 21st March 2010, 08:36 PM

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?

Perry Babin · 22nd March 2010, 02:50 AM

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)?

phil33875 · 22nd March 2010, 03:10 AM

I assume ill have to put the amp back in the car and reconnect power, ground and remote wire.

Perry Babin · 22nd March 2010, 04:05 AM

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.

phil33875 · 23rd March 2010, 11:54 PM

r16-r19 measured @ .36 v and q12-q15 @ .83 v. wtf?

phil33875 · 24th March 2010, 12:05 AM

whats the proper way of testing the output transistors? ohm test or diode?

Perry Babin · 24th March 2010, 12:40 AM

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.

phil33875 · 24th March 2010, 12:45 AM

are those voltages right?

Perry Babin · 24th March 2010, 01:17 AM

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.

phil33875 · 25th March 2010, 01:23 AM

what are the irf3205 for? all 8 were burned up. thats where i tested for voltage because they are removed from the board

21st March 2010, 08:36 PM	#1
phil33875 diyAudio Member Join Date: Mar 2010	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?

22nd March 2010, 02:50 AM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	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)? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

22nd March 2010, 04:05 AM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	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. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

24th March 2010, 12:40 AM	#7
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	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. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

24th March 2010, 01:17 AM	#9
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	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. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links


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22nd March 2010, 03:10 AM	#3
phil33875 diyAudio Member Join Date: Mar 2010	I assume ill have to put the amp back in the car and reconnect power, ground and remote wire.

23rd March 2010, 11:54 PM	#5
phil33875 diyAudio Member Join Date: Mar 2010	r16-r19 measured @ .36 v and q12-q15 @ .83 v. wtf?

24th March 2010, 12:05 AM	#6
phil33875 diyAudio Member Join Date: Mar 2010	whats the proper way of testing the output transistors? ohm test or diode?

24th March 2010, 12:45 AM	#8
phil33875 diyAudio Member Join Date: Mar 2010	are those voltages right?

25th March 2010, 01:23 AM	#10
phil33875 diyAudio Member Join Date: Mar 2010	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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