Kenwood 9104D

[mike49504]

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

 

[Perry Babin]

Other than blown outputs or power supply FETs, I know of no common problems.

Post the voltages on the 494.

 

[mike49504]

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

 

[Perry Babin]

Pin 1 is shutting it down. Post the voltages on IC17.

 

[mike49504]

1:.68
2:4.24
3:0
4:0
5:1.61
6:3.69
7:.02
8:4.35

 

[Perry Babin]

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.

 

[mike49504]

Ok I noticed R45 is toasty Do you know the value by chance?

 

[Perry Babin]

R45 is 220k and unlikely to be burned. Maybe something near it burned.