E-FLITE Blade MCX S300 Instruction Manual - page 15
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Troubleshooting Guide
Troubleshooting Guide
Problem
Possible Cause
Solution
Aircraft will not
“throttle up” but
all other controls
seem to function.
•Userdidnotlower
throttle trim and throttle
stick prior to initializing
the aircraft.
•Throttlechannelis
reversed. Note: Futaba
transmitters (equipped
with Spektrum
modules) may require
you to reverse the
throttle channel.
•Lowerthrottlestickandthrottle
trim to their lowest settings.
•Reversethrottlechannelon
specific transmitter if applicable.
Upper rotor head/
hub is broken.
•Crashdamage
•ReplacewithEFLH2212by
carefully removing the (2)
screws in the lower main gear
and transferring all unbroken
parts to the new upper rotor
head/hub. Follow the “Exploded
View” section of the manual.
Pages 30–31
Aircraft appears
to show significant
decrease in flight
time.
•Flightbatteryisnotfully
charged.
•AAbatteriesincharger
have inadequate power.
•EFLB1101Sbatteryhas
been over-discharged
multiple times, causing
damage to battery life.
•Rechargeflightbattery
completely.
•ReplaceAAbatteriesinthe
charger and recharge flight
battery completely.
•ReplaceEFLB1101Sbattery
and read “Battery Warnings and
Guidelines” section of manual.
Page 7
Charger light stays
on after Li-Po
battery is
disconnected or
remains on for
longer than 40
minutes when
charging.
•AAbatteriesinthe
charger have
inadequate power.
•ReplaceAAbatteriesin
the charger.
Aircraft hovers
with a “toilet bowl”
effect type circle
on its own.
•Bindingintheupper
rotor head.
•Damagedrotorblades
•Loosenupperrotorhubflybar
retaining screw.
•Replacerotorblades.
Problem
Possible Cause
Solution
LED on Aircraft
remains
flashing and
cannot be
controlled by
transmitter.
•Userdidnotwaitat
least 5 seconds after
powering their
transmitter prior to
connecting the flight
battery to the Aircraft.
•UserboundtheAircraft
to a different
transmitter.
•Transmitterwastoo
close to Aircraft during
the initialization
process.
•Unplug,thenreconnectflight
battery.
•RebindAircrafttoyourdesired
compatible transmitter.
Page 27
•Movetransmitter(poweredon)a
few feet from the Aircraft
prior to reconnecting the flight
battery.
Aircraft appears to
drift towards a
certain direction.
•Userdidnotre-trimthe
aircraft.
•Read“Understandingthe
Primary Flight Controls” section
of this manual. Pages 20–23
Controls appear to
be reversed after
binding to a differ-
ent transmitter.
•Userdidnotinitially
set up their transmitter
prior to binding to the
Aircraft.
•Read“ControlTest”sectionof
this manual.
Pages 14–16
Aircraft constantly
spins on its own.
•UserdidnotCENTER
the rudder trim on the
transmitter prior to
initialization of aircraft.
•Usermovedorswayed
the aircraft during the
initialization process.
•Userhasnottrimmed
the aircraft to compen-
sate for battery voltage
drop during flight.
•Uppermaingearis
binding with lower main
gear.
•Centertheruddertrimonyour
transmitter and re-initialize the
aircraft.
•Unplug,thenreconnecttheflight
battery and DO NOT move or
sway the helicopter during
initialization.
•Read“UnderstandingPrimary
Controls” section of this manual.
Pages 20–23
•Loosen(2)screwsonthelower
main gear and ensure there
is slight “play” in between the
upper and lower main gears.
Lube between the upper and
lower main gears if applicable.
Aircraft does not
function after
connecting flight
battery and air-
craft smells burnt.
•Usermayhave
accidentally plugged
the flight battery in the
wrong polarity.
•Replace5-in-1board
(EFLH1065) and ensure the RED
polarity marks are facing the
same direction when connecting
the flight battery to the 5-in-1
board.