I am using Orion Starshoot autoguider with PHD guiding on a HEQ5PRO mount which has suddenly developed problems. Selecting a star PHD guiding successfully tracks the star but once the crosshairs change to green the star very slowly drifts until red error messages start flashing after about 40 seconds.
I assume communication from the camera to the computer is OK and the problem lies between the camera and the motor board or in the motor board itself. I checked connections from the camera to the motor board using a multimeter and all checked OK. Before I go and buy a new motor board, any comments on my logic and who supplies motor boards for HEQ5Pro?