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Old 30th December 2010, 05:15 AM   #1
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Default Kenwood KAC-7204

Amp powers up and draws excessive current . None of the fets or outputs test bad in the board Im gonna pull the outputs out and see if any are leaking. I will update in a few
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Old 30th December 2010, 05:33 AM   #2
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With outputs removed amp powers up and idle's perfect. None of the outputs test shorted and no leakage. Any ideas on where to go from here?
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Old 30th December 2010, 05:47 AM   #3
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Check for broken solder connections on the bias transistors.
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Old 30th December 2010, 06:05 AM   #4
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Ok the problem is in the right channel. I reflowed the solder on the transistor (C3114) that connects to the bias pot and still draws excessive current.
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Old 30th December 2010, 06:15 AM   #5
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Did you try reducing the bias?
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Old 30th December 2010, 06:24 AM   #6
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Yes both Bias pots are fully counter clockwise.
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Old 30th December 2010, 06:29 AM   #7
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Measure the DC voltage across each of the 4 emitter resistors. Post the voltage across each one (to 3 decimal places).
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Old 30th December 2010, 06:37 AM   #8
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1:0.04 volts

2:0.04 volts

3:0.04 volts

4:0.04 volts
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Old 30th December 2010, 06:39 AM   #9
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If the voltage between the base and emitter of the bias transistor is 0v, check the driver transistors. If none appear shorted, pull them and carefully check for leakage.
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Old 30th December 2010, 06:50 AM   #10
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Between emitter and base on the Bias transistor i have 0.51 volts.
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