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Old 26th August 2011, 02:34 AM   #1
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Default Kenwood KAC-729S

Got this in for repair..

I replaced 2 defective outputs in the left channel..


Amp will not power up.. No voltage on the 1st leg of the power supply fets..

Any ideas>??
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Old 26th August 2011, 02:48 AM   #2
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Location: Louisiana
Post the voltage on the 494.

Pin 1:
Pin 2:
Pin 3:
Pin 4:
Pin 5:
Pin 6:
Pin 7:
Pin 8:
Pin 9:
Pin 10:
Pin 11:
Pin 12:
Pin 13:
Pin 14:
Pin 15:
Pin 16:
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Old 26th August 2011, 03:02 AM   #3
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Pin 1: 0
Pin 2: 4.98
Pin 3: 0.07
Pin 4: 0.31
Pin 5: 1.66
Pin 6: 3.66
Pin 7: 0
Pin 8: 13.83
Pin 9: 5.12
Pin 10: 5.11
Pin 11: 13.83
Pin 12: 13.83
Pin 13: 4.98
Pin 14: 4.98
Pin 15: 4.98
Pin 16: 0
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Old 26th August 2011, 03:17 AM   #4
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Location: Louisiana
You should have ~5v on the gates of the FETs.
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Old 26th August 2011, 03:26 AM   #5
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Ok i fixed that one i had a broken solder connection...


I have another one in for repair also..

when i power the second one up it draws excessive current...

If i only hook power and ground up it will draw excessive current also..

I removed the fets and they all test fine..

Any ideas?
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Old 26th August 2011, 03:29 AM   #6
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Location: Louisiana
Power it up through the limiter and measure the DC voltage on the power supply FETs (black on leg 3, red on leg 1).
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Old 26th August 2011, 03:39 AM   #7
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I get -3.38 volts on all of them
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Old 26th August 2011, 03:50 AM   #8
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Location: Louisiana
It can't be negative. Are the meter leads in the correct locations in the meter?
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Old 26th August 2011, 03:57 AM   #9
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Sorry my mistake.. I get 3.38 volts
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Old 26th August 2011, 04:23 AM   #10
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Did you have your probes backwards?

If so, did you have them backwards when you read 0v on the gates?
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