71
T R
MT-4S 2.4GHZ FH4T RADIO SYSTEM USER'S GUIDE
Transmitter does not turn ON
Transmitter will not bind to receiver
Receiver won't power ON
Audible alarm beeps continuously
One or more LEDs flashing
No key-press or Timer function sounds
Servo movement is slow
Servo does not move when using Trim Switch
Inadequate transmitting range
Servo(s) move the wrong direction
Servo Horn(s) not centered
Control linkage(s) bind
Servo moves too much or not enough when
Trim Switch is pressed
Throttle servo moves to programmed position
without input
Can't program Receiver Battery Voltage
Fail Safe
No Telemetry connection
Transmitter batteries installed incorrectly
Battery tray not plugged in
Transmitter batteries are dead
Damage caused by using incorrect
charger or reverse polarity
Modulation Type incorrect
Too much time elapsed after pressing
receiver Bind Button
Attempting to Bind incompatible receiver
Using Electronic Speed control (ESC)
Receiver batteries are dead
Using incorrect Binding procedure
Receiver batteries are dead
Receiver batteries not installed correctly
Loose switch connection
Low transmitter battery voltage
Transmitter left ON 10 minutes or more
without control input
Transmitter battery voltage too high
Indicates transmitter status
Key Tones are Muted
Low receiver battery voltage
Control linkages binding
Using a negative Servo Speed value
Trim is outside of operational range
Low transmitter battery voltage
Low receiver battery voltage
Receiver antenna not mounted correctly
Incorrect Servo Reversing setting
Servo horn not installed correctly
Servo Sub-Trim out of adjustment
To much servo travel
Trim Step resolution requires adjustment
Receiver battery voltage has reached
programmed Receiver Battery Voltage
Fail Safe voltage value
Throttle channel Fail Safe value set to
FREE or HOLD
Using FH2 Reciver
Telemetry System turned OFF
Outside of Telemetry range
Reinstall batteries, observing correct polarity
Plug in battery tray
Replace or recharge transmitter batteries
Contact Airtronics Customer Service
Change Modulation Type to match receiver
Quickly press ENTER key in BIND menu after releasing
receiver Bind Button
Use only Airtronics 2.4GHz FH2, FH3 or FH4T surface
receivers
Disconnect ESC and use dry cell battery for Binding
procedure, then reconnect ESC after Binding
Replace or recharge receiver batteries
Follow Binding procedure carefully
Replace or recharge receiver batteries
Reinstall receiver batteries, observing correct polarity
Double-check all connections including switch
Replace or recharge transmitter batteries
Move Steering Wheel or Throttle Trigger, or press any
key to clear alarm and continue operation
Use transmitter battery whose voltage is 9.6 volts or
less when fully charged
For more information, see LED Condition Indicators
table on page 10.
Increase Key Tone volume in BUZZER menu
Replace or recharge receiver batteries
Adjust control linkages to operate smoothly
Increase Servo Speed value
Center Trim Switches to '0', center the servo horn and
control linkages
Replace or recharge transmitter battery
Replace or recharge receiver batteries
Mount receiver antenna as recommended
Change Servo Reversing setting
Turn servo horn 180º and reinstall
Adjust Servo Sub-Trim to center servo horn
Decrease servo travel using EPA function
Adjust Trim Step resolution
Replace or recharge the receiver batteries
Set Throttle channel Fail Safe to a percentage value
This function is not supported with FH2 receivers
Turn Telemetry System ON
Move transmitter closer to receiver in model
REFERENCE
TROUblESHOOTInG GUIDE
REFEREncE
This troubleshooting guide can help you diagnose and solve some of the more common problems that you might encounter
with your radio control system.
If you cannot solve the problem using this troubleshooting guide, please contact Airtronics Customer Service using the information
in the Service and Support section on page 3.
pROblEM
cAUSE
SOlUTIOn
