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Old 9th November 2010, 09:02 PM   #1
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Default Kenwood 9104D

Im working on this amp wondering if there is a common problem i should check since the power supply fets have 0 volts on leg 1
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Old 9th November 2010, 09:32 PM   #2
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Other than blown outputs or power supply FETs, I know of no common problems.

Post the voltages on the 494.
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Old 9th November 2010, 09:45 PM   #3
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1:4.97
2:4.72
3:4.72
4:.34
5:1.45
6:3.67
7:0
8:13.88
9:.04
10:.04
11:13.87
12:13.87
13:4.87
14:4.98
15:4.98
16:0
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Old 9th November 2010, 09:47 PM   #4
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Pin 1 is shutting it down. Post the voltages on IC17.
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Old 9th November 2010, 10:01 PM   #5
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1:.68
2:4.24
3:0
4:0
5:1.61
6:3.69
7:.02
8:4.35
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Old 9th November 2010, 10:12 PM   #6
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If you can remove D34 without damaging it, do so. This will defeat part of the protection circuit so you'll need to have the transistors clamped and a current limiter or a 10 amp fuse inline.
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Old 9th November 2010, 10:18 PM   #7
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Ok I noticed R45 is toasty Do you know the value by chance?
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Old 9th November 2010, 10:27 PM   #8
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R45 is 220k and unlikely to be burned. Maybe something near it burned.
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