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Old 21st December 2012, 02:49 PM   #1
404Amps is offline 404Amps  United States
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Default KICKER KX500.2, HELP

Hello, and Happy Holidays to all.

I have the kx500.2 amp that was cutting out. I goofed by letting the DMM probe slip between the legs of a PS FET. I removed the 1 FET that shorted, and now when I supply power to the amp it does not turn on.

FETs Q15 and Q 16 looks to have overheated but no damaged to the board or trace.

The amp is not blowing any fuses, just won't power up. Can anyone explain what is going with this amp? Ps. I.m using a 7.5a power line fuse.
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Old 21st December 2012, 02:54 PM   #2
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Post the DC voltage on pins 10. 11, 12 and 13 of the TL494.
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Old 21st December 2012, 03:18 PM   #3
404Amps is offline 404Amps  United States
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source V = 12.48
@ amps connector = 0.267v

@TL*94cn
pin 10 = 0v
pin 11 = 0v
pin 12 = 0v
pin 13 = 0v

DMM blk probe on amps main ground
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Old 21st December 2012, 03:33 PM   #4
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Post the DC voltage and the numbers on the faces for Q1 and Q2.
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Old 21st December 2012, 03:45 PM   #5
404Amps is offline 404Amps  United States
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Q1 = 2sb649
0.273v

Q2 = 2N4401-047
0.263v
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Old 21st December 2012, 04:49 PM   #6
404Amps is offline 404Amps  United States
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Q1 = 2sb649
E = 0.258v
C = 0.0v
B = 0.251v

Q2 = 2N4401-047
1 = 0.0v
2 = 0.015v
3 = 0.309v
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Old 21st December 2012, 04:55 PM   #7
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Are you sure that the fuses are not blown?

Do you have 12v across the B+ and ground terminals on the amp?
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Old 21st December 2012, 10:53 PM   #8
404Amps is offline 404Amps  United States
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Thank Perry, I did have a bad fuse!.. Amp is now turning on and going green.
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Old 22nd December 2012, 03:31 AM   #9
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Is it producing clean audio now?

The regulators in these amps tend to overheat. If the board around the regulator transistors or the solder joints show signs of heat stress, you should replace the transistors with larger ones and add heatsinks.
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