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Autopilot
I have been reading the various messages about the 300 nav-o-matic in Paul's 67 T337B.
The servo is the old version which you undo 4 screws, the 2 at the bottom are easy but the 2 upper ones are hard to get to, then the servo splits at and angle and you remove the whole servo which has the electronics,motor, followup and clutch leaving just the drive assy in the wing so that the a/c can be flown with this part removed.
That does make fault finding alot easier!
The computer is part of the control head (the 2 boards that were mentioned).
I pretty sure that the you will find the drive transistors u/s you will be best to replace them all.
You will need to recenter the servo before you secure it back in the wing.
If the servo is not the problem try diconnecting the plug on the AH and see if that cures the problem.
Pete
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