Symptom
Steering servo
works,
but no motor
function.
No steering
servo function or
motor function
Motor does not
run when throttle
is advanced;
motor runs when
braking
No brake
function
Poor braking
effect
Insufficient top
speed
Poor
acceleration
Speed control
overheats
Motor does not
stop; continues
running slowly.
Radio
interference
Imprecise, non-
linear control
characteristics
Cause
Set-up/basic settings problem
Speed control connected to wrong
receiver channel
Motor defective
Motor brushes stuck
Wiring problem
Speed control defective
Receiver plug incorrectly wired
Crystal faulty
Receiver faulty
Transmitter faulty
Speed control damp, protective
circuit tripped
Receiver power supply circuit faulty
Transmitter throttle polarity
(direction) has been changed
Set-up/basic settings problem
Speed control faulty
Set-up/basic settings problem
Motor pinion/reduction ratio too
large
Problem with set-up/basic settings
Transmitter has been changed
after speed control set-up, or has
changed its own settings.
Motor faulty, brushes sticking
Inadequate cooling
Motor too powerful, or input voltage
too high
Motor pinion/reduction ratio too
large
Car drive/bearing system problem
Motor run too often without cooling
period.
Damp in speed control
Set-up/basic settings problem
Speed control faulty
Motor inadequately suppressed
Receiver or antenna too close to
power cables, motor, battery or
speed control;
Receiver antenna too short, or
coiled up.
Receiver fault
Transmitter or transmitter module
fault
Servo fault
Crystal fault, or crystal not correct
type
Power cables too long, red power
cable connected incorrectly.
Connector contact problem.
Transmitter battery/cells flat
Transmitter antenna too short
Transmitter battery/cells flat
Transmitter or transmitter "car
program" has been changed.
Remedy
Repeat basic speed control set-up procedure from start; to store
the function correctly you must hold stick in full-throttle position
while you press the set-up button.
Note also that all transmitter functions must be set as described
in the instructions.
Speed control must be connected to Ch.2; check polarity of
receiver lead.
Fit new motor.
Check that carbon brushes are free to move.
Check cables and connectors.
Send unit in for repair.
Check polarity of receiver plug.
Replace components one by one to locate fault.
Switch off immediately, allow speed control to dry out.
Check BEC output voltage, or send unit in for repair.
Simply repeat speed control set-up procedure
Leave transmitter stick direction unchanged
Repeat basic speed control set-up procedure from start;
see also "Motor does not run" point.
Send unit in for repair.
Repeat basic speed control set-up (see above), or reset Low ATV,
EPA, ATL on transmitter to maximum.
Fit smaller motor pinion.
Repeat basic speed control set-up procedure from start; see also
"Motor does not run" point.
Try different motor, free up brushes
Cut cooling openings in bodywork.
Use less powerful motor, or battery with lower voltage/fewer cells.
Fit smaller motor pinion.
Check or replace components.
Allow speed control to cool off after each full run.
Disconnect battery immediately, dry speed control with heat-gun
(hot air).
Repeat basic speed control set-up procedure.
Send unit in for repair.
Solder capacitors to motor.
See "Installation".
Replace components one by one to locate fault.
Use original crystals only.
See "Wiring" and "General installation notes".
Check connectors.
Replace dry cells, recharge NC pack.
Extend transmitter antenna fully.
Check transmitter battery regularly.
Repeat basic speed control set-up procedure.
SET UP
Neutral, high, and brake MAX points setting
In set-up mode MC800C Ver.2 stores every step when you press the Set-up button. All the
settings are stored in the unit even when the speed control is subsequently disconnected from
the battery. Set up the following basic functions on your transmitter (if present):
• High ATV, EPA (throttle travel) - maximum
• Low ATV, EPA, ATL (brake travel) - maximum
• EXP, EXPO (exponential) - start with 0
• SUB trim (neutral trim) - center
• TH trim - center
• Throttle reverse (servo reverse) - any setting; must not be changed after completion of
set-up procedure.
• Asymmetrical stick travel is possible (2/3 throttle - 1/3 brake)
If your transmitter does not feature these set-up functions, it is already in “basic set-up” mode.
Remove the motor pinion, or ensure in some other way that the wheels of the model are free
to rotate.
DIGITAL VARIABLE MODES SETTING
Power Control 2, Hyper Brake, and Neutral Brake settings
You can change the Mode settings as described below.
Turn on the power in following order.
Hold the SET button pressed in for at least 3 seconds using the
small screwdriver supplied.
FUTABA CORPORATION Makuhari Techno Garden Bldg., B6F 1-3 Nakase, Mihama-ku, Chiba 261-8555, Japan Phone: (043) 296-5118 Facsimile: (043) 296-5124
©FUTABA CORPORATION 2004, 5
Special Markings
Pay special attention to the
safety at the parts of this
manual that are indicated by
the following marks.
Symbol:
; Prohibited
; Mandatory
Mark
Meaning
Procedures which may lead to a dangerous
condition and cause death or serious injury to
the user if not carried out properly.
Procedures which may lead to a dangerous
condition or cause death or serious injury to
the user if not carried out properly, or
procedures where the probability of superficial
injury or physical damage is high.
Procedures where the possibility of serious
injury to the user is small, but there is a
danger of injury, or physical damage, if not
carried out properly.
TROUBLE-SHOOTING GUIDE
CHECKER LED DISPLAY
Relationship between amp operation and checker LED display
The MC800C Ver.2 operating state can be checked with the checker LED as shown below.
START ACCELERATION FUNCTION
Start Acceleration function setting
• Activate Start Acceleration by holding transmitter at full brake for 5 sec before start.
This system shortens the speed control’s response time at start time, with the result that you
have more acceleration available.
Operation
Checker LED display
High
point
Neutral
point
Brake MAX
point
*Becomes brighter nearer
the high point.
*Becomes brighter nearer
the MAX point.
Forward
Brake
On (green)
On (red)
On (red)
On (red)
Off
Off
Off
On (red)
On (red)
On (red)
On (green)
Off
at Normal Brake
at Neutral Brake
1
2
3
MC800C Ver.2
N
N
N
4
5
• This completes the set-up procedure. Check the operation by the following "CHECKER
LED DISPLAY." When throttle operation and the CHECKER LED DISPLAY are not
correct, set up again from the first step.
• If you make a mistake during the set-up procedure, don't worry: switch MC800C off for
about 10 seconds and start again from the first step.
• Switch the transmitter on.
• Set the transmitter throttle stick to neutral, and then switch the speed control on.
• The SET LED flashes red, to indicate that the unit is in set-up mode.
It continues flashing until the set-up procedure is completed.
Turn on the power in following order.
Hold the MODE button pressed in for at least 3 seconds using the
small screwdriver supplied.
1
2
• Switch the transmitter on.
• At race events you usually do not have access to your transmitter. In this situation it is
possible to adjust the speed control’s settings without the transmitter signal. All you have to
do is disconnect the receiver lead (attached to the speed control) from the receiver. (In this
case, remove the motor pinion, or disconnect the motor.)
• Switch the speed control on.
• The Mode LED flashes green to indicate that you have selected ‘Power Control’ mode.
Neutral
point
setting
High
point
setting
Brake MAX
point
setting
･
Neutral state
･
Full high state
･
Full brake state
SET button operation
MODE LED
SET LED
･
Press SET button
once.
･
Press SET button
once.
･
Press SET button
once.
･
MODE LED
flashes green
and the motor
beeps.
･
SET LED
flashes red.
･
MODE LED
flashes red.
･
SET LED
flashes red.
･
MODE LED
glows red.
･
SET LED
glows red.
Transmitter throttle operation
5
3
4
Power
Control 2
mode
setting
Hyper
Brake
mode
setting
Neutral
Brake
mode
setting
MODE
LED
SET LED
SET button
operation
MODE button
operation
•You can check the set value (1-5) by
counting the flashes of the red SET
LED (one flash equals value 1, two
flashes value 2 etc.)
•The SET LED now shows the stored
value again.
•You can adjust the
value by pressing
the SET button.
•Press the SET
button to change
the value.
•The SET LED shows the stored value
again.
•Press the SET
button to change
the value.
Set value
Power level
Flash number
Set value
Brake
Flash number
Min
1
2
3
4
5
1
2
3
4
5
Max
(Smooth)
(Mega punch)
(Progressive)
(Strong)
1
2
3
4
5
1
0
0
2
3
4
5
Max
Linear
Set value
Brake
Flash number
1
2
3
4
5
1
0
0
2
3
4
5
Max
Off
•Press the Mode
button again to
move to the
next mode.
•The MODE LED flashes
red to indicate that you
have selected ‘Hyper
Brake’ mode.
•Press the Mode
button again to
move to the
next mode.
•Press the MODE button
again to complete the
programming procedure
and return to the normal
mode of operation.
•The MODE LED flashes
red/green to indicate that
you have selected ‘Neutral
Brake’ mode.
•The MODE LED flashes
green to indicate that you
have selected ‘Power
Control’ mode.
Power Control 2 set value:
1: for low grip
2: for off-road
3: for touring car
4: load adaptive mode
5: for stock racing
Default settings:
MC800C Ver.2 speed controls are supplied factory-adjusted.
The default setting is this:
•Power Control 2 = 2
•Hyper Brake = 2
•Neutral Brake = 0
If you lose track of the modes during the set-up procedure, you
can reset the speed control to the default settings. With the
transmitter switched on, hold the SET button pressed in while
you switch on the speed control. This action returns the unit to
the factory settings.
(*1)According to the setting of Neutral
Brake, the range of Hyper Brake which
can be set up changes. For example,
when Neutral Brake is set as the level
2, the setting range of Hyper Brake
serves as levels 2-5.
(*1)
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