Autopilot Servo

[Paul Sharp]

OK, here's what I found this morning - first the wiring to the plug which attaches to the servo:

A - White/Green
B - White/Yellow
C - White/Red
E - Green/Dark Blue
F - Green
H - Red
K - White/Grey
(7 wire bundle)

With the A/P running, center knob pulled and turned to the left, only pin with any voltage reading on it was H. That's it. Whether i turned the knob to the right or pushed it in, that was the only pin reading any voltage, positive or negative, of any in the connector.

So, where am I then? Any suggestions of what I should do next?

I called around and checked on the transistors; they all cross over now to NTE numbers, but are listed as available (some here in stock, others would need ordering). But it seems from the readings I'm getting that I may have a control head problem?