I'm troubleshooting 2 CGS88s I've built that both seem to be doing the same thing. I've built them up as Triple Bi-Directional Routers. I've added the 3 position switches and I'm taking +15 off the positive Bead.
The channels connected to U3 and U4 work fine. They flip the inputs based on switch position and CV input. The channel connected to U5 will not flip inputs by either switch or CV.
When not connected to jacks and switches, with the +15 being sent directly to pads E I & A I get whacky readings on U5 at pins 3, 8, 10, and 13.
Here's what I measured;
U2
U3
U4
U5
1
-6.53
2.65
2.39
2.33
2
-6.46
2.49
2.34
2.36
3
-6.97
6.21
6.23
-6.87
4
6.24
2.45
2.24
2.24
5
-6.88
2.40
2.38
2.46
6
-6.45
6.21
6.23
-6.87
7
-7.01
-7.01
-7.01
-7.01
8
-7.01
-7.01
-7.01
6.22
9
6.23
2.30
2.42
2.41
10
6.23
-7.01
-7.01
6.23
11
-6.98
2.41
2.42
2.31
12
-6.47
2.37
2.35
2.30
13
-7.01
-7.01
-7.01
6.23
14
7.06
6.23
6.23
6.23