Adjustments
.
Tuning Adjustment
S.BUS System
AVCS / NORMAL Modes
Setup before a run [ Remote gain use ]
Gain adjustments are carried out with a transmitter.
Follow this procedure when the gyro's port 2 and the receiver's gain
CH are connected (or connected via S.BUS).
1
Run the car in the gyro off mode (gyro gain 0%) and
adjust the steering trim (sub trim).
2
Select the appropriate setting for the steering servo that
you are using. Servo selection switch of GYC441 should
be moved to SR mode ON or OFF.
*Do not use a normal digital servo in the SR servo mode (ON). The
servo may be damaged. Use a normal digital servo in the SR servo
mode (OFF).
3
Turn on your transmitter's power. Set the gyro
sensitivity to about 70% at the NORMAL or AVCS side
in according to the transmitter's instruction manual. Refer
to the <GAIN CH> <AVCS / NORMAL Modes> graph on the
next page.
*Make the gain tuning adjustment after running the car and noting
the behavior.
4
Receiver ON → The GYC441 requires 3-5 seconds to
initialize when the power is turned on. Do not move
the car and do not move the steering wheel during this
initialization or the gyro may not initialize properly. Once
the initialization process has been completed, the steering
servo will move slightly several times, indicating that the
GYC441 is now ready for use. If the neutral has shifted, the
LED will blink orange. In that case, it reboots.
5
Move the steering wheel left and right and adjust the
limit trimmer to maximize servo operation without
binding the control linkage or mechanical limits.
Drive the vehicle and adjust the gyro sensitivity.
1
Always re-trim with the gyro gain at 0.
2
In this state, turn the receiver power OFF → ON. The
neutral position is memorized. Steering trim must not
be performed while the car is running.
The gyro has 2 operating modes: NORMAL mode and AVCS
mode. In AVCS mode, the angle is controlled simultaneously
with NORMAL mode's rate control (swing speed). The AVCS
mode increases straight stability more than NORMAL mode.
Choose your mode to match your preferences.
3CH (GAIN CH) is set up with reference to the transmitter
manual. Neutral position becomes GAIN 0%. It is divided into
AVCS side and NORMAL side. Refer to the GYC441's LED.
When Port 2 is not used for gain and SBUS/SBUS2 is not
used, the trimmer works as the gain adjustment shown
below.
0%
-50%
+50%
50%
50%
100%
100%
+110%
-110%
End point rate
Gain
NORMAL side（LED : GREEN）
AVCS side（LED : RED）
Unlike conventional radio control systems, the S.BUS system
sends operating signals from the receiver to a gyro or other
S.BUS compatible devices by data communication. The S.BUS
compatible device executes only executes data for the chan-
nels it sets. For this reason, multiple servos can be connected
to the same signal line.
The S.BUS system requires a dedicated S.BUS receiver and
S.BUS servo (gyro, etc.).
If the car is turned to the left
by hand → steering goes out
to the right
＜Limit Trimmer Adjustments＞
It adjusts to the
maximum operation of
linkage.
Steering wheel to
full
Limit trimmer
Adjustments
D/R (UP side)
Gyro sensitivity zero --- LED OFF
AVCS side --- LED red
NORMAL side --- LED green
6
Using the gyro direction switch, adjust the gyro
direction so that steering moves all the way to the
right when the car is turned to the left. Correctly set gyro
operating direction or the car will not run.
[ When remote gain function is off ]
Adjust the gyro sensitivity with the GYC441 trimmer.
If port 2 of gyro is not connected, remote gain is automatically
prohibited. (S.BUS connection is excluded)
In this case, the limit trimmer is automatically changed to the
gyro sensitivity setting trimmer.
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and left.)
1
Select the appropriate setting for the steering servo that
you are using. The GYC441's servo selection switch of
GYC441 should be moved to SR mode ON or OFF.
*Do not use a normal digital servo in the SR servo mode (ON). The servo
may be damaged. Use a normal digital servo in the SR servo mode
(OFF).
2
Gain trimmer halfway to the left : NORMAL(green) or
right : AVCS (red) from the 70% point.
3
Receiver ON → The GYC441 requires 3-5 seconds to
initialize when the power is turned on. Do not move
the car and do not move the steering wheel during this
initialization or the gyro may not initialize properly. Once
the initialization process has been completed, the steering
servo wil
l move slightly several times, indicating that the
GYC441 is now ready for use. If neutral has shifted, LED will
blink orange. In that case, it reboots.
4
Using the gyro direction switch, adjust the gyro's
operating direction so that steering moves all the way
to the right when the car is turned to the left. Correctly set
the operating direction or the car will not run.
● Trimmer operation
*Since this gyro is very small, the adjustment trimmer is a small part. Al-
ways operate the trimmer with the included mini screwdriver without
applying excessive force.
*Limit is symmetrical from the neutral
position. Only proceed with the limit
adjustment after completing the trim
adjustment.
Gyro Sensitivity and mode Switching
When the remote gain function is not used, the clockwise
direction from the center of the sensitivity setting trimmer is
AVCS mode and the counterclockwise direction is NORMAL
mode. At the center position, the sensitivity becomes zero
and when the trimmer is turned fully to the left or right, the
sensitivity becomes 100%.
The sensitivity setting criteria by end point is shown in the
figure below.
＜
GAIN CH
＞
Gyro sensitivity zero --- LED OFF
AVCS side --- LED red
NORMAL side --- LED green
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When the remote gain function is used, NORMAL and AVCS
mode switching is performed in accordance with the direc-
tion of operation of the transmitter's remote gain channel.
At the + rate side, the AVCS mode is selected and at the ‒
rate side, the NORMAL mode is selected. The sensitivity is
changed by adjusting the end point rate.
0%
NORMAL 70%
AVCS 70%
AVCS 100%
NORMAL 50%
NORMAL 100%
0%
AVCS 50%
AVCS
NORMAL
Countersteers against
outside force, but cannot
correct the skid direction.
Corrects the skidding
direction and forcefully
maintains the heading.
Outside
force
Outside
force