Backlash Compensation - Vixen Starbook-S User Manual

intervals. The backlight is turned off after the set time elapses.
(3)After setting the backlighting duration, move the cursor to OK and press Select to enter.
Using the Backlighting
The backlight will turn off automatically after the set duration if no key has been pressed during
that time. Press Menu to turn on the backlight.
In addition, the backlight will turn ON in the following cases:
- When you press a key to display a dialog such as an alignment key, or when a dialog appears on
the screen such as the warning for reverse motion.
- When the screen is changed from/to CHART MODE to/from SCOPE MODE.
The backlight will not be turned off in the following cases:
- During automatic slewing.
- While a dialog or menu is displayed.
- While in CHART MODE.

Backlash Compensation

Backlash is a momentary stoppage in the movement of the telescope due to a sluggish
engagement of the gears. It occurs when the direction of the movement is reversed. The
backlash does not occur while the telescope moves at constant tracking speed.
The backlash compensation can adjust time lag when the direction of the telescope movement is
reversed and it allows you to make smoother motor control for comfortable operation.
Nevertheless, some backlash is necessary for the motor to operate smoothly.
Checking the backlash compensation
To verify the amount of backlash compensation, it is easiest to use a bright planet, star of the first
magnitude or the Moon.
(1) Polar align the mount exactly so as to point the R.A. axis of the mount to the North Pole of the
sky.
(2) Change the screen to SCOPE MODE, and down the speed of the telescope to the slowest or the
second slowest with the Zoom+ key.
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