Futaba GV-1 - Manual (Page 44)

FUNCTIONS
Error display
When adjusting the throttle linkage make sure that ATV and AFR are set to
50% or greater otherwise the GV-1 will not operate and "-ERR-" will be
displayed. Also when setting the "Stop"position make sure it is not higher
than idle or the "-ERR-" will be displayed.
Throttle servo operation test Tst
The servo operating position set with the "limit set" function can be checked.
(Check method)
1
Each time the DATA+ or DATA-
key is pressed, the throttle servo
moves to the Idle->High->Stop
point set position.
Rotation sensor monitor (monitor function)
Sen
The rotation sensor signal level can be checked.
(Monitoring method)
1
Bring the magnet near the sensor.
The signal level is displayed on the LCD screen.If the display
is 60% or more, the speed can be normally picked up. If less
than 60% is displayed, adjust the sensor position.