Vixen AGA-1 - Manual (Page 10)

If its brightness is good, the indicator will stop going on and off and
will remain it.
If the guide star is too bright for AGA-1, the [+] red indicator will be
lit.
If it is too dark, the [-] red indicator will be lit.
5. Finding another guide star
If the guide star is too bright or too dark, find another guide star.
After centering it on the monitor screen, press the “Level Check”
key again.
Note: a) The “Level Check” key is also used for resetting AGA-1.
For rechecking brightness of the guide star, press the
key and all the LED lights will go out.
If you press the key again, AGA-1 will begin to check
brightness.
b) Avoid using a double star as the guide star. The double
star may cause trouble in guiding.
DRIVE CHECK MODE
This mode allows checking the motor speed and turning direction.
1. Pressing the “Drive Check” key
If you press the “Drive Check” key, AGA-1 will have the right
ascension and declination motors begin to drive and will compute
the moving direction and speed of the guide star automatically.
During computing, the drive check indicator’s green light goes on
and off.