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Old 23rd February 2013, 04:43 PM   #1
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Default Problem with Kicker Kx 500.2 Amp

So i am having a similar problem to what desaf had with the same amp. Have rca input running but no sound output. +15v pin reads 14.60, -15v reads 9.18. Nothing appears to be burnt or disconnected. Negavie line from board to cooling fan does not work. Not sure if problem is related or not. Any info from you perry would be much appreciated.

Update pulled board off of amp underside of Q15and Q16 were burnt. Resoldered but still get same voltage out of +/-15v prongs. And no sound output. Also resoldered ground under fan to no avail.
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Old 23rd February 2013, 07:32 PM   #2
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Location: Louisiana
The fan isn't supposed to run except possibly for a second at startup. It is thermally controlled.

Do you have a scope?

Does the amp have both positive/negative rail voltage on all of the output transistors?
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Old 23rd February 2013, 08:27 PM   #3
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I am sorry to say that I do not have a scope. How exactly would I check the rail voltage on the output transistors?

I attempted to find the solution on your bcae1 site but could not locate that information. I am sorry I would still consider myself novice as far as amp repair goes.
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Old 23rd February 2013, 08:44 PM   #4
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Also what kind of voltage #s should i expect to see?
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Old 23rd February 2013, 09:51 PM   #5
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Ok Perry after more reading I believe I have tested the transistors properly. I used my dmm with the black attatched to the negative input on the amp, and touched the positive to each leg of each transistor. My results were as follows:

All readings left to right with power supply side of the amp on my left.

Far side
Q211
-10.89
43.2
-14.06
Q211
-10.91
42.8
-14.20
Q215
-11.29
-42.8
-14.69
Q212
-11.76
-42.6
-15.33

Near side
Q115
-.185
-43.2
-.515
Q112
-.185
-43.2
-.515
Q114
-.186
43.2
-.515
Q111
-.186
43.1
-.515

also my voltages at the +/-15v pins on the audio board have remained the same. +14.45 -9.16
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Old 24th February 2013, 01:44 AM   #6
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Location: Louisiana
Pull Q212 and check it out of the board.

Post the DC voltage on all 3 legs of Q15 and Q16.
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Old 25th February 2013, 05:40 PM   #7
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I have a quick question. I'm thinking i should test voltage on Q15 & Q16 before removing Q212. Is that correct?

Also is it going to be ok to have all the transistors removed from the heat sink to test voltage on Q15 & Q 16?
I am at a point where i can accomplish both tasks just need to know the correct order to complete.
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Old 25th February 2013, 11:05 PM   #8
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Location: Louisiana
It doesn't matter if the amp isn't going into protect mode.
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Old 26th February 2013, 12:05 AM   #9
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Readings left to right as usual.
Q16
.922
43.8
-15.29
Q15
14.99
25.51
15.56
Q212 Out of amp
leg 1-2) 1.69 ohms
leg 1-3) 2.233 ohms
leg 2-3) reads 28.14 ohms before dmm goes blank like it is reading but cant show reading if that makes sense.

The points of Q16 and Q15 under the board were touchy as to where they would give a reading.

If new parts are needed I am close to a radio shack. Would they sell the needed parts for replacement?
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Old 26th February 2013, 12:08 AM   #10
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Location: Louisiana
Q212 is defective. Radio shack won't have a suitable replacement.

Did you mean 9.22v on Q16?

Reassemble the amp and clamp all transistors. Place Q212 under the clamp so that the clamp will hold the adjacent transistor but don't insert the legs into the board).

Does the amp produce clean audio?
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