FUTABA 8UHPS Instruction Manual page 43

The DISP function swaps the black and white displays in the graphic trim position
display shown on the screen. We suggest you try both settings and see which one is
better for you. (The reverse display is not affected by the Data Reset command.)
Setting you trim displays
Displays current setting
("NEGA", "POSI")
(Default value = NEGA)
The Subtrim menu is used to make small changes or corrections in the neutral
position of each servo. We recommend that you center the digital trims before
making subtrim changes, and that you try to keep all of the subtrim values of as small
as possible. Otherwise, when the subtrims are large values, the servo's range of
travel is restricted.
The recommended procedure is as follows: zero out both the trims (TRIM RSET
menu) and the subtrims (this menu). Next, mount the servo arms and set up your
linkages so that the neutral position of the control surface is as close to where it
should be as possible. Finally, use a small amount of subtrim to make fine
corrections.
Setting Subtrims
This number is the
Channel
subtrim value
being set
(allowed to be -120
(Aileron)
to +120)
(Default value = 0)
These keys are used to move through submenus in the TRIM function.
TRIM DISPLAY SELECTION
Select the display method
("positive" or "negative") with
the (+) and (-) keys.
(+) key = POSI
(-) key = NEGA
SETTING SUBTRIMS
• Begin with the Aileron
subtrim. Use the (+) and (–)
keys to neutralize the control
surface.
• Adjust the remaining
controls (when used) in a
similar fashion: Elevator,
Throttle, Rudder, Gyro sens.,
Pitch, CH7, CH8
If you're unhappy with a subtrim value, you may reset
it to zero by pressing the (+) and (-) keys
simultaneously.
40
To SUBTRM function
To INVERT function
Choose channels 1-8 with these keys.
To TRAINR function
To TRIM function
RETUR
Data input keys
Use these
keys to set
subtrims.