Crunch GP3000

[mike49504]

Im having a problem with this amp. I have no voltage on the gate leg for the power supply fets. Im suppose to have 5 volts but i have 0.06 volts.

I swapped the driverboards and still nothing still have 0.06 volts on the gate leg.

Any ideas?

[Perry Babin]

Post the DC voltage on all of the legs of the power supply IC.

IC#
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:

[mike49504]

1:0.08
2:2.39
3:0.08
4:0.08
5:1.54
6:3.68
7:0
8:13.84
9:10.79
10:10.79
11:13.84
12:13.84
13:4.90
14:4.90
15:4.90
16:0

[Perry Babin]

There appear to be a couple of problems. The voltage on 9 and 10 shouldn't be that high unless something is pulling them up or the IC is defective (it's not likely to fail this way). I'd suspect driver problems (shorted drivers, drivers in wrong locations, drivers installed improperly...).