danoglide65 it ran out of steps. I loosened the grub screw on the motor and ran the OTA focus knob all the way in, clockwise, and locked the set screws.
Don't do that.
If you see a step of 73, that is too close to zero for any kind of auto focus algorithms to work with. The ASIAIR implementation is brain damaged, and won't allow you to go to negative step sizes.
So, what you need to do is to first achieve manual focus, and if you find the step number to be small, simply go to Focuser Setting and edit/change the "current" value field (say, 73) to a value that something near mid scale (say, 30000). In ASIAIR's Focuser Setting, tap on the icon with the square and a pencil to edit the Current field.
Now you have a range of about 30000 steps in either direction of drawtube travel. (Max step size is 65535.)
With most R&P focusers, the draw tube will change somewhere between 2 µm and 8 µm per EAF step (there are 5760 EAF steps per revolution). To move the draw tube by 4mm, you typically need some 1000 EAF steps. Conversely, an EAF value of 73 would only allow about a quarter of a mm of travel before the EAF stops moving.
If you insists on loosening the grub screw, just keep the grub screw loose after manually focusing, ask the EAF to GoTo step size of 30000 (this could take a while), and when the EAF has finished moving, retighten the grub screws. Your in-focus EAF step is now 30000.
Your choice of which method you want to use.
Chen
