Futaba FX-40 - Manual (Page 62)

62 <Linkage Menu>
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Sub-Trim
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(The display screen is an example. The screen depends on the model type.)
The Sub-Trim function is used to set the servo
neutral position, and may be used to make fine
adjustments to the control surface after linkages
and pushrods are hooked up. When you begin to set
up a model, be sure that the digital trims are set to
their center position.
Sub trim adjustment
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*See above
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