PowerBox Systems Mercury SRS Instruction Manual page 17

The following examples illustrate the correct procedure for the
Servo-Match function:
a) Fine-tuning multiple servos connected to a single control surface;
in this example: right aileron connected to output A and output B
- Disconnect the linkages from the unmatched servos, as they may
exert damaging forces during the adjustment procedure!
- First adjust the mechanical linkage of one servo (generally the inboard
one, i.e. closer to the fuselage, connected to OUTPUT A), then - if
necessary - adjust it at the transmitter, until the centre position and
maximum end-points are as you require.
- Now select the channel to be fine-tuned in the servo-matching menu.
In this example it is OUTPUT B.
- Leave the corresponding transmitter stick at the centre position.
- Now select: INIT CHANNEL
- Initialise the output by moving the transmitter stick to both end-points
in turn.
- Move the cursor to START SERVOMATCHING → but do not press
the SET button at this stage!
- At the transmitter, move the aileron stick to the position to be adjusted,
then press the SET button.
- You can now release the aileron stick: the PowerBox maintains this
position. You now have both hands free, and can adjust the position
accurately with one hand, using buttons I and II, whilst checking the
length (matching) of the disconnected ball-link at the horn with the
other hand.
- Press the SET button again to conclude this adjustment.
- Complete the set-up procedure for the centre position and both
end-points before re-connecting the servo linkage.
- If you need to carry out further adjustments to another end-point or
centre position, move the aileron stick in the desired direction again,
and press the SET button again to start the procedure.
- Repeat the procedure with all the servos connected to the same
control surface.
Note: if your model is fitted with very large ailerons, it can be advantage-
ous not to match the servos with 100% accuracy. If the servos are
precisely matched, gearbox play may allow aileron flutter to develop.
You can eliminate this risk as follows: first match the servos exactly to
each other, and then press buttons I or II two or three times to reduce the
effect of lost motion in the servo gears to a controlled extent.
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