Futaba T4GRS-24G Radio Control User Manual Part 1

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User Manual Part 1

Thank you for purchasing a Futaba 4GRS-2.4GHz system.

Before using your 4GRS-2.4GHz system, read this manual carefully in order to use

your R/C set safely.

After reading this manual, store it in a safe place.

IN NORTH AMERICA

Please feel free to contact the Futaba Service Center for assistance in operation, use and

programming. Please be sure to regularly visit the 4GRS Frequently Asked Questions

web site at www.futaba-rc.com/faq/. This page includes extensive programming, use,

set up and safety information on the 4GRS radio system and is updated regularly. Any

technical updates and US manual corrections will be available on this web page. If you

do not nd the answers to your questions there, please see the end of our F.A.Q. area for

information on contacting us via email for the most rapid and convenient response.

Don’t have Internet access? Internet access is available at no charge at most public li-

braries, schools, and other public resources. We nd internet support to be a fabulous

reference for many modelers as items can be printed and saved for future reference, and

can be accessed at any hour of the day, night, weekend or holiday. If you do not wish to

access the internet for information, however, don’t worry. Our support teams are avail-

able Monday through Friday 8-5 Central time to assist you.

Application, Export, and Modication

1. This product may be used for models only. It is not intended for use in any application

other than the control of models for hobby and recreational purposes.

OUTSIDE NORTH AMERICA

Please contact your Futaba importer in your region of the world to assist you with any

questions, problems or service needs.

Please recognize that all information in this manual, and all support availability, is

based upon the systems sold in North America only. Products purchased elsewhere may

vary. Always contact your region’s support center for assistance.

FOR SERVICE ONLY:

Futaba Service Center

3002 N. Apollo Drive, Suite 1

Champaign, IL 61822

Phone: 217-398-0007

www.futaba-rc.com/service.html

Email: futabaservice@hobbico.com

FOR SUPPORT :

(PROGRAMMING AND USER

QUESTIONS)

Please start here for answers to most questions:

www.futaba-rc.com/faq/

Fax: 217-398-7721

Phone: 217-398-8970 option 2

• No part of this manual may be reproduced in any form without prior permission.

• The contents of this manual are subject to change without prior notice.

• This manual has been carefully written. Please write to Futaba if you feel that any corrections or clarica-

tions should be made.

• Futaba is not responsible for the use of this product.

Battery Recycling (for U.S.A.)

The RBRC™ SEAL on the (easily removable) nickel-cadmium battery and

nickel-metal-hydride battery contained in Futaba products indicates that Fu-

taba Corporation is voluntarily participating in an industry program to col-

lect and recycle these batteries at the end of their useful lives, when taken

out of service within the United States. The RBRC™ program provides a

convenient alternative to placing used nickel-cadmium batteries and nickel-metal-hy-

dride batteries into the trash or municipal waste system, which is illegal in some areas.

You may contact your local recycling center for information on where to return the

spent battery. Please call 1-800-8-BATTERY for information on NiCd/NiMH battery

recycling in your area. Futaba Corporation's involvement in this program is part of its

commitment to protecting our environment and conserving natural resources.

NOTE: Our instruction manuals encourage our customers to return spent batteries to a

local recycling center in order to keep a healthy environment.

RBRC™ is a trademark of the Rechargeable Battery Recycling Corporation.

2. Exportation precautions:

(a) When this product is exported from the country of manufacture, its use is to be ap-

proved by the laws governing the country of destination for devices that emit radio fre-

quencies. If this product is then re-exported to other countries, it may be subject to re-

strictions on such export. Prior approval of the appropriate government authorities may

be required. If you have purchased this product from an exporter outside your country,

and not the authorized Futaba distributor in your country, please contact the seller im-

mediately to determine if such export regulations have been met.

(b) Use of this product with other than models may be restricted by Export and Trade

Control Regulations, and an application for export approval must be submitted.

3. Modication, adjustment, and replacement of parts:

Futaba is not responsible for unauthorized modication, adjustment, and replacement of

parts on this product. Any such changes may void the warranty.

Table Of Contents

For Your Safety As Well As That Of Others .........................8

Explanation Of Symbols ...............................................................8

2.4GHz System Precautions .........................................................8

Receiver Mode Precautions .........................................................8

Operation Precautions ..................................................................9

NiMH/NiCd Battery Handling Precautions ................................10

Storage And Disposal Precautions ...........................................10

Other Precautions .......................................................................11

Installation ..........................................................................33

Receiver and Servo Connections .............................................33

Installation Safety Precautions ..................................................34

Before Using ......................................................................12

Features ......................................................................................12

Set Contents ...............................................................................14

Transmitter T4GRS ......................................................................15

Nomenclature ........................................................................... 15

Battery Replacement Method...................................................16

When Using The Optional Battery ............................................17

When Charging The Optional Battery ......................................18

Low Battery Alarm ....................................................................19

Power & Display Switch ............................................................20

Display When Power Switch Is Turned On ...............................21

Stick Operation CH1 CH2 ........................................................22

Switch Dial Operation CH3 CH4 ..............................................23

Digital Trim Operation ............................................................... 24

Stick Lever Head Adjustment ...................................................25

Stick Mounting Angle Adjustment.............................................25

Stick Tension Adjustment .........................................................26

Mechanical Throttle Stick Stroke Adjustment ...........................27

Neutral Adjuster Operation ....................................................... 28

Changing to Ratchet Type Throttle Stick ..................................30

About Transmitter Antenna And Receiver.................................31

About The Transmitter Antenna ................................................ 31

Receiver Terminology ............................................................... 32

Receiver Installation .................................................................32

Before

Using

Function

Map

Functions

For Your Safety

As Well As

That Of Others

Installation

Reference

Initial

Set-Up

Function Map .....................................................................43

Operation Of Screen ...................................................................43

Selecting the Menu Screen ......................................................43

Selecting Items On The Menu Screen .....................................44

Value Of Each Function And Changing The Set Value ...........44

Basic Menu Japanese Katakana Character Display ................45

Function List ................................................................................46

Functions ...........................................................................47

Model "MODEL" .......................................................................... 47

Model Menu Display ................................................................. 47

Model Selection "SELECT" ....................................................48

Model memory select

Model Copy "COPY" ................................................................49

Model memory copy

Model Reset "RESET" ............................................................50

Model memory reset

Model Name "MDL NAME" ........................................................51

Model memory name & User name, set/modify

Servo Reverse "REVERSE" ........................................................52

Servo operation reversing

Sub trim "SUBTRIM" ..................................................................53

Servo center position ﬁne adjustment

End Point Adjuster "END POINT" .............................................54

End point adjustment

Fail Safe Function "FAIL SAFE" ................................................. 57

Fail safe, battery fail safe function

Exponential Adjustment "EXP"..................................................59

Steering operation curve / Throttle curve adjustment

Servo Speed "SPEED" ................................................................62

Steering/ Throttle servo delay adjustment

Throttle Acceleration "TH ACCEL" ...........................................65

Function which adjusts the initial response from the throttle neutral position

A.B.S. Function "TH A.B.S" .......................................................67

Pulse brake

Initial Set-Up .......................................................................37

Preparations (Transmitter) ..........................................................37

Receiver Type Check (RX MODE) ..........................................37

Receiver Type Change & How To Link .................................38

Throttle Mode Check ................................................................41

Trims Initial Set-Up ...................................................................41

Channel 3/4 "CH3/CH4" ...............................................................71

Channel 3/4 Position

Steering Dual Rate/ Throttle ATL "D/R ATL" ..............................72

Steering D/R, Throttle ATL Rate

Select Switch Dial Function "SW/ DIAL" ...................................73

Selection of functions operated by dial, digital trim and switch

Brake Mixing "BRAKE MIX" .......................................................76

Front and rear independent brake control for 1/5GP car, etc.

Programmable Mixing "PROG MIX" ..........................................78

Programmable mixing between speciﬁc channels

4WS Mixing "4WS" ......................................................................80

Special mixing used with Crawler and other 4WS type vehicles

Dual ESC Mixing "DUAL ESC" ...................................................82

Special mixing used with Crawler and other 4WD type vehicles

Gyro Mixing "GYRO MIX" ............................................................84

Used to set the Futaba car rate gyro.

CPS Mixing "CPS MIX" ................................................................86

Controls the Futaba CPS-1 channel power switch.

Throttle Mode "TH MODE" .........................................................88

Throttle Servo Neutral Position "SXNT" ...................................88

Throttle servo forward and brake operation proportion setting

Idle-Up "IDLUP" ......................................................................89

Idle up at engine start

Neutral Brake "NTBRK" ............................................................90

Neutral brake function

Throttle Off (Engine Cut) "THOFF" .........................................91

Engine cut off by switch

ESC Link Function "MC LINK" ...................................................92

Special function, Futaba ESC (MC940CR, MC960CR, MC950CR, MC851C,

MC602C, MC402CR, etc.)

Data Transfer "MDL TRANS" ..................................................... 100

The T4GRS model memory data to another T4GRS

Timer Function "TIMER" ..........................................................102

Up, Fuel down, or lap timer

Lap List "LAP LIST" .................................................................108

Lap timer data check

System Functions "SYSTEM" .................................................109

Liquid crystal screen contrast adjustment

Liquid crystal screen backlighting display mode setup

Backlight display time setup

Backlight brightness setup

Battery type setting

Buzzer sound tone adjustment

Before

Using

Function

Map

Functions

For Your Safety

As Well As

That Of Others

Installation

Reference

Initial

Set-Up

Reference .........................................................................123

Ratings ......................................................................................123

Warning Displays .....................................................................124

Optional Parts ...........................................................................126

When requesting repair ............................................................126

Alarm Setting if Tx is left switched ON

Item which displays the basic menu screen in katakana characters for Japanese use

Throttle stick adjustment

HOME screen display mode setting

Adjuster "ADJUSTER" ..............................................................113

Steering wheel and throttle trigger correction

Telemetry "TELEMETRY" .........................................................115

Telemetry/ Log Screen Map ...................................................116

Telemetry Function ON/OFF ..................................................117

Telemetry Sensor Setting ....................................................... 118

Log Setting, Start/ Stop .......................................................... 120

Log Data List ..........................................................................122

Warning

Caution

When using the T4GRS in the T-FHSS (HIGH) and S-FHSS (HIGH) mode, always use it under

the following conditions:

Servos :

Futaba digital servo (including BLS Series brushless servos)

Receiver’s battery :Matched to the ratings of the receiver and connected digital servo (dry cell battery cannot be used).

Transmitter mode :

RX MODE

Under other conditions, the set will not operate, or the speciﬁed performance will not be displayed even if it operates.

In addition, it may cause servo trouble. Futaba will not be responsible for damage, etc. caused by combination with the

products of other companies.

In addition, the FSU Fail Safe Unit cannot be used because the system is different. Use the fail safe function of the trans-

mitter.

When using analog servos, always switch the T4GRS servo response to the "NORM" mode.

Transmitter mode

T-FHSS(NORM)", "T-FHSS(NORM)"and FHSS mode

Receiver’s battery :Matched to the ratings of the receiver and connected servo (dry cell battery cannot be used).

The set cannot operate in the "HIGH" mode. Operation in this mode will cause trouble with the servo and other equipment.

Digital servos (including BLS Series brushless servos) can also be used in the "NORM" mode.

For Your Safety As Well As That Of Others

Use this product in a safe manner. Please observe the following safety precautions at all

times.

Explanation Of Symbols

The parts of this manual indicated by the following symbols are extremely important

and must be observed.

Danger

Indicates procedures which may lead to dangerous situations and could

cause death or serious injury as well as superﬁcial injury and physical

damage.

Indicates procedures that may not cause serious injury, but could lead to

physical damage.

Symbols: : Prohibited : Mandatory

Indicates a procedure which could lead to a dangerous situation and may

cause death or serious injury if ignored and not performed properly.

Warning

Caution

Symbols Explanation

2.4GHz System Precautions

Special attention should be paid before turning on the system while other cars are running or oth-

er airplanes are ﬂying because the 2.4GHz RC system could potentially affect them.

Be sure to set the Fail Safe function.

Receiver Mode Precautions

For Your Safety As Well As That Of Others

Warning



Do not operate outdoors on rainy days, run through puddles of water or use when visibility is lim-

ited.

Should any type of moisture (water or snow) enter any component of the system, erratic operation and loss of control

may occur.

Do not operate in the following places.

-Near other sites where other radio control activity may occur.

-Near people or roads.

-On any pond when passenger boats are present.

-Near high tension power lines or communication broadcasting antennas.

Interference could cause loss of control. Improper installation of your Radio Control System in your model could result in

serious injury.

Do not operate this R/C system when you are tired, not feeling well or under the inﬂuence of alco-

hol or drugs.

Your judgment is impaired and could result in a dangerous situation that may cause serious injury to yourself as well as

others.

Do not touch the engine, motor, speed control or any part of the model that will generate heat

while the model is operating or immediately after its use.

These parts may be very hot and can cause serious burns.

Always perform an operating range check prior to use.

Problems with the radio control system as well as improper installation in a model could cause loss of control.

(Simple range test method)

Have a friend hold the model, or clamp it down or place it where the sticks or prop cannot come in contact with any ob-

ject. Walk away and check to see if the servos follow the movement of the controls on the transmitter. Should you notice

any abnormal operation, do not operate the model. Also check to be sure the model memory matches the model in use.

Turning on the power switches.

Always check the throttle stick on the transmitter to be sure it is at the neutral position.

1. Turn on the transmitter power switch.

2. Turn on the receiver or speed control power switch.

Turning off the power switches

Always be sure the engine is not running or the motor is stopped.

1. Turn off the receiver or speed control power switch.

2. Then turn off the transmitter power switch.

If the power switches are turned off in the opposite order, the model may unexpectedly run out of control and cause a

very dangerous situation.

When making adjustments to the model, do so with the engine not running or the motor discon-

nected.

You may unexpectedly lose control and create a dangerous situation.

Before running (cruising), check the fail safe function.

Check Method; Before starting the engine, check the fail safe function as follows:

1) Turn on the transmitter and receiver power switches.

2) Wait at least one minute, then turn off the transmitter power switch. (The transmitter automatically transfers the fail

safe data to the receiver every minute.)

3) Check if the fail safe function moves the servos to the preset position when reception fails.

The fail safe function is a safety feature that minimizes set damage by moving the servos to a preset position when

reception fails. However, if set to a dangerous position, it has the opposite effect. When the reverse function was

used to change the operating direction of a servo, the fail safe function must be reset.

Setting example: Throttle idle or brake position

Operation Precautions

Caution

Warning

For Your Safety As Well As That Of Others

(Only when NiMH/NiCd /LiFe batteries are used)

NiMH / NiCd / LiFe Battery Handling Precautions

Never plug the charger into an outlet of other than the indicated voltage.

Plugging the charger into the wrong outlet could result in an explosion or ﬁre.

Never insert or remove the charger while your hands are wet.

You may get an electric shock.

Do not use the T4GRS transmitter's battery, as the receiver's battery.

Since the transmitter's battery has an overload protection circuit, the output power will be shut down when the high current

load is applied. This may result in runaway or fatal crash.

Always check to be sure your batteries have been charged prior to operating the model.

Should the battery go dead while the model is operating, loss of control will occur and create a very dangerous situation.

To recharge the transmitter battery, use the special charger made for this purpose.

Overcharging could cause the battery to overheat, leak or explode. This may lead to ﬁre, burns, loss of sight and many

other types of injuries.

Do not use commercial AA size NiCd and NiMH batteries.

Quick charging may cause the battery contacts to overheat and damage the battery holder.

Do not short circuit the battery terminals.

A short circuit across the battery terminals may cause abnormal heating, ﬁre and burns.

Do not drop the battery or expose it to strong shocks or vibrations.

The battery may short circuit and overheat; electrolyte may leak out and cause burns or chemical damage.

When the model is not being used, always remove or disconnect the battery.

Leaving the battery connected could create a dangerous situation if someone accidentally turns on the receiver power

switch. Loss of control could occur.

Always keep the charger disconnected from the outlet while it is not in use.

Storage And Disposal Precautions

Warning

Do not leave the radio system or models within the reach of small children.

A small child may accidentally operate the system. This could cause a dangerous situation and injuries. NiCd batteries can

be very dangerous when mishandled and cause chemical damage.

Do not throw NiMH/NiCd/LiFe batteries into a ﬁre. Do not expose batteries to extreme heat. Also do

not disassemble or modify a battery pack.

Overheating and breakage will cause the electrolyte to leak from the cells and cause skin burns, loss of sight, and other in-

juries.

Warning

For Your Safety As Well As That Of Others



When the system will not be used for any length of time, store the system with NiMH/NiCd batteries

in a discharged state. Be sure to recharge the batteries prior to the next time the system is used.

If the batteries are repeatedly recharged in a slightly discharged state, the memory effect of the NiMH/NiCd battery may

considerably reduce the capacity. A reduction in operating time will occur even when the batteries are charged for the rec-

ommended time. (After discharge to 1cell E.V.=1V)

When the LiFe batteri

will not be used for a long time, to prevent it from deteriorating we recom-

mend that it be kept in about the half capacity state instead of fully charged. Also be careful that

the battery does not enter the over-discharged state due to self-discharge.

Periodically (about every 3 months) charge the battery.

The electrolyte in NiCd/NiMH batteries is a strong alkali. Should you get even the smallest amount of the electrolyte in

your eyes, DO NOT RUB. Wash immediately with water, and seek medical attention at once. The electrolyte can cause

blindness. If electrolyte comes in contact with your skin or clothes, wash with water immediately.

Do not store your R/C system in the following places.

- Where it is extremely hot or cold.

- Where the system will be exposed to direct sunlight.

- Where the humidity is high.

- Where vibration is prevalent.

- Where dust is prevalent.

- Where the system would be exposed to steam and condensation.

Storing your R/C system under adverse conditions could cause deformation and numerous problems with operation.

If the system will not be used for a long period of time, remove the batteries from the transmitter

and model and store in a cool, dry place.

If the batteries are left in the transmitter, electrolyte may leak and damage the transmitter. This applies to the model also.

Remove the batteries from it also to prevent damage.

Caution

Do not expose plastic parts to fuel, motor spray, waste oil or exhaust.

The fuel, motor spray, waste oil and exhaust will penetrate and damage the plastic.

Always use only genuine Futaba transmitters, receivers, servos, ESCs (electronic speed controls),

NiMH/NiCd batteries and other optional accessories.

Futaba will not be responsible for problems caused by the use of other than genuine Futaba parts. Use the parts speciﬁed

in the instruction manual and catalog.

Never use the R304SB-E in GP (Engine) models.

Receiver R304SB-E can be used only with EP car.

Other Precautions

A used battery is a valuable resource. Insulate the battery terminals and dispose of the battery by taking it to a battery recycling center.

Before Using

-Telemetry system

The T4GRS transmitter has adopted the newly developed bidirectional communication sys-

tem "T-FHSS"

-2.4GHzSS (Spread Spectrum) radio communication system

Frequency channel setting is unnecessary: Channel shifting takes place within the 2.4GHz

band automatically. This system minimizes the interference from other 2.4GHz systems.

-Model memory for 40 models

Model names can use up to 10 letters, numbers, and symbols, so that logical names may be

used. A model memory with different setups can be created by using the model copy func-

tion.

- Menu Selection

The setup screens are called from menu screens. The menu screen can be selected from

among 2 levels (LEVEL1/LEVEL2).

-Brake mixing for large cars (BRAKE)

Brake mixing of the front and rear sticks of 1/5GP and other large cars can be adjusted inde-

pendently.

-4WS mixing for crawlers and other 4WS type (4WS)

This function can be used with crawlers and other 4WS type vehicles.

-Dual ESCs mixing for crawlers cars (DUAL ESC)

ESC at the front and rear are controlled independently.

-Gyro mixing (GYRO MIX)

The sensitivity of Futaba car rate gyros can be adjusted from the T4GRS.

-CPS-1 mixing (CPS MIX)

LED lighting and ashing control using our CPS-1 channel power switch can be matched to

steering and throttle operation by switch only.

-Anti-skid braking system (TH A.B.S)

This function applies the brakes so that the tires of gasoline engine cars, etc. do not lose

their grip on the road even when braking at corners.

-Throttle acceleration (ACCEL)

Gasoline engine cars have a time lag before the clutch and brakes become effective.

The throttle acceleration function reduces this time lag.

Before Using

Features

Before Using

-Throttle speed (SPEED)

Sudden stick operation on a slippery road surface will only cause the tires to spin and the

model to not accelerate smoothly. By setting the throttle speed function, operation can be

performed smoothly and easily. It also suppresses battery consumption.

-Steering speed (SPEED)

When you sense that the steering servo is too fast, etc., the servo operating speed (direction

that suppresses the maximum speed) can be adjusted.

-Racing timer (TIMER)

The lap timer can record 100 lap times and total time. The timer can also be started auto-

matically by stick operation. The race time and audible alarm can be set.

Re-/fueling time are indicated by an audible alarm. An up timer is also provided.

-Digital trim

The current trim position is displayed on the LCD screen. The operating amount of 1 step

can also be adjusted.

Trim operation has no effect on the maximum travel of the steering and throttle servos.

-Function select switch / dial function (TRIM DIAL)

This function assigns functions to 2 switches and dials (digital trim, digital dial). The step

amount and operating direction can also be adjusted. Trim positioning at each model call is

unnecessary because all the dials are digital.

-ESC-Link function (MC-LINK)

This is a dedicated function which allows setting of the contents of the Link software which

makes possible Futaba speed controller (ESC), MC950CR, MC850C, MC851C, MC602C,

MC402CR, etc. variable frequency and other data changes by T4GRS.

-Tension adjustment function

The tension of the steering stick & throttle stick springs can be adjusted from the inside.

-Adjustable Throttle Stick Travel (Mechanical ATL Adjustment)

Make this adjustment when you want to decrease the total travel of the forward (up) side or

brake (down) side of the throttle stick.

-Display switch

Display switch allows function setup without transmitting.

Before Using

After opening the box, rst check if the contents conform to the following. The contents

depend on the set as shown below.

Set Contents

Transmitter T4GRS

Receiver R304SB or R304SB-E(Built-in Antenna for EP car models)

Miscellaneous

Receiver switch

* It is not attached to R304 SB-E set.

Mini screwdriver

* It is used for receiver.

Instruction manual

- If any of the set contents are missing, or you have any questions, please contact

your dealer.

Caution

When using the T4GRS in the T-FHSS (HIGH) and S-FHSS (HIGH) mode, always use it under

the following conditions:

Servos :

Futaba digital servo (including BLS Series brushless servos)

Receiver’s battery :Matched to the ratings of the receiver and connected digital servo (dry cell battery cannot be used).

Transmitter mode :

RX MODE

Under other conditions, the set will not operate, or the speciﬁed performance will not be displayed even if it operates.

In addition, it may cause servo trouble. Futaba will not be responsible for damage, etc. caused by combination with the

products of other companies.

In addition, the FSU Fail Safe Unit cannot be used because the system is different. Use the fail safe function of the trans-

mitter.

When using analog servos, always switch the T4GRS servo response to the "NORM" mode.

Transmitter mode

T-FHSS(NORM)", "T-FHSS(NORM)"and FHSS mode

Receiver’s battery :Matched to the ratings of the receiver and connected servo (dry cell battery cannot be used).

The set cannot operate in the "HIGH" mode. Operation in this mode will cause trouble with the servo and other equipment.

Digital servos (including BLS Series brushless servos) can also be used in the "NORM" mode.

Always use only genuine Futaba transmitters, receivers, servos, ESCs (electronic speed con-

trols), NiMH, NiCd, Li-ion batteries and other optional accessories.

Futaba will not be responsible for problems caused by the use of other than Futaba genuine parts. Use the parts speci-

ﬁed in the instruction manual and catalog.

Before Using

*The switches, dial, and trimmers in the gure are shown in the initial setting position.

Antenna

Digital Dial 1 (DL1)

(default CH4)

Throttle stick

Power&Display

switch

Digital Trim 2 (DT2)

(default throttle trim)

Digital Trim 4 (DT4)

(default ATL) Digital Trim 3 (DT3)

(default dual rate)

Grip Handle

Digital Trim1 (DT1)

(default steering trim)

Steering stick

Switch 1 (SW1)

Switch 2 (SW2)

(default CH3)

LCD screen

Nomenclature

Transmitter T4GRS

Battery cover

＋Button

－Button

Jog Button

Charge jack (Only for NiMH)

Communication port

Hook

Do not carry the transmitter by

the antenna.

There is the danger that the antenna

wire will break and operation will

become impossible.

Stick lever head the precautions.

There is a small projection at the tip

of the lever heads to prevent slipping.

When carrying the transmitter, be

careful these projections do not

damage your skin, clothes, or other

objects.

Antenna cannot be removed.

Damage will occur if the antenna is

forcibly removed.

Edit Button

Battery cover

Slide battery cover while pressing here.

Before Using

Battery Replacement Method

1Remove the battery cover from the transmitter

by sliding it in the direction of the arrow in the

ﬁgure.

2Remove the used batteries.

3Load the new AA size batteries. Pay very close

attention to the polarity markings and reinsert

accordingly.

4Slide the battery cover back onto the case.

Battery Replacement Method (4 AA Size Batteries)

Load the four batteries in accordance with the po-

larity markings on the battery holder.

Check:

Turn the power switch on the transmitter to the ON position. Check the battery

voltage display on the LCD screen. If the voltage is low, check the batteries for in-

sufcient contact in the case or incorrect battery polarity.

Disposal of the Dry Cell Batteries:

The method to dispose of used dry cell batteries depends on the area in which you

reside. Dispose of the batteries in accordance with the regulations for your area.

Caution

Never try to recharge a dry cell battery.

The transmitter may be damaged or the battery electrolyte may leak or the battery may break.



Insert the batteries in the correct polarity.

If the polarity is incorrect, the transmitter may be damaged.

When the transmitter is not in use, remove the batteries.

If the battery electrolyte leaks, wipe off the case and contacts.

Do not use commercial AA size NiCd and NiMH batteries.

Quick charging may cause the battery contacts to overheat and damage the

battery holder.

Caution

When closing the battery cover, be

careful that the battery cover does

not pinch the battery lead wires.

Shorting of the battery lead wires may lead

to fire and abnormal heating and cause

burns or ﬁre disaster.

HT5F1700B

CAPACITY: 6.0VDC-1700mAh

CHARGING: 170mA-12hours

HT5F1700B

CAPACITY: 6.0VDC-1700mAh

CHARGING: 170mA-12hours

Before Using

Battery Replacement Method

1Refer to the previous description and remove the

transmitter battery cover.

2After removing the dry cell battery box from the

transmitter, disconnect the connector.

3Insert the connector of the new battery and load

the new battery into the transmitter.

4Finish by installing the battery cover.

When Using The Optional Battery

When using an optional rechargeable battery, replace the battery as described below.

-Always use the optional HT5F1800B or FT2F1700BV2/2100BV2 rechargeable battery.

-The type of power source used must be set by system setting.

-When the transmitter will not be used for a long time, remove the battery.

AC outlet

Charger

Transmitter

charging LED

To transmitter

charging jack

To receiver

Ni-Cd battery

Balance charging connector for

LiFe battery charger.

Before Using

Charging A LiFe Battery

(Example: When using the FT2F1700BV2/2100BV2 with the special

charger)

1Remove the battery cover.

2Disconnect the battery from the 4GRS

3Balance charging cannot be done through the

transmitter, you must remove the LiFe battery to do

this charge.

Charge the optional FT2F1700BV2/2100BV2

(LiFe) battery with the special charger in accor-

dance with the instruction manual supplied.

When the battery will not be used for a long time,

to prevent it from deteriorating we recommend

that it be kept in about the half capacity state in-

stead of fully charged. Also be careful that the bat-

tery does not enter the over-discharged state due

to self-discharge.

Periodically (about every 3 months) charge the

battery.

Over current protection

Charging jack

Cannot be used for

charge of LiFe.

LiFe battery is removed

from transmitter.

The transmitter charging circuit is equipped with an over cur-

rent protection circuit (1.0A). If the battery is charged with a

quick charger for other than digital proportional R/C sets, it

may not be fully charged.

The charging time when charging the HT5F1800B battery

with the optional special charger is approximately 15 hours.

However, when the battery has not been used for some time,

repeat charging 2 or 3 times to activate the battery.

Charging a NiMH Battery

(Example: When using the HT5F1800B with the special charger)

1Plug the transmitter cord of the special charger in-

to the charging jack on the rear of the transmitter.

2Plug the charger into an AC outlet.

3Check that the charging LED lights.

When Charging the Optional Battery

Warning

Caution

Before Using

Never plug it into an outlet other than the indicated voltage.

Plugging the charger into the wrong outlet could result in an explosion or ﬁre.

Do not insert and remove the charger when your hands are wet.

It may cause an electric shock.

Always use the special charger or a quick charger for digital proportional R/C sets to charge a

digital proportional R/C set NiMH battery.

Overcharging a Ni-MH battery can result in burns, ﬁre, injuries, or loss of sight due to overheating, breakage, or electro-

lyte leakage.

When the charger is not in use, disconnect it from the AC outlet.

Do this to prevent accidents and to avoid overheating.

Low Battery Alarm

If the transmitter battery voltage drops below the usable range, an audible

alarm will sound and "BATTERY LOW VOLTAGE" will be displayed on

the LCD screen. If the battery goes dead while running (cruising), you will

lose control of the vehicle (boat). Therefore, retrieve the vehicle (boat) im-

mediately and cease operation.

Because the low battery alarm voltage of a dry cell battery is different from

that of a rechargeable battery pack (genuine Futaba option), the type of

power source used must be set by system setting.

Warning

When a low battery alarm is generated, cease operation immediately and

retrieve the model.

If the battery goes dead while in operation, you will lose control of the model.

OFF

DISP

Radio waves are not being

transmitted

MIDDLE

When you do not run, turn OFF.

It cannot operate.

PWR ON

Radio waves are being transmitted

DOWN

LCD screen

Before Using

Power & Display Switch

The power switch and display switch of the T4GRS are inte-

grated. In the PWR ON mode, radio waves are transmitted

and in the DISP mode, model data, settings can be checked

without transmitting radio waves.

In addition, some setting menus may only be displayed in

the DISP mode.

Precautions when turning the power switch on and off.

- When the data is changed using the edit buttons or trim levers, wait at

least two seconds before turning off the power. If the power is turned off

within two seconds after the data is changed, the new data will not be writ-

ten to memory.

- If the power switch is quickly switched from the DISP mode to the PW

ON mode or vice versa, the switch error shown at the right may be gener-

ated. If this occurs, cycle the power.

Power ／DISP

Switch

Battery voltage display

ST :Steering trim display

TH :Throttle trim display

D/R :Steering D/R display

ATL :Throttle ATL display

Power switch turned on

Beep conrmation sound is generated and the

HOME screen shown below appears.

Display When Power Switch Is Turned On

Model name (10 characters)

The current receiver mode is

displayed.

Telemetry function :ON/OFF

Receiver -> Transmitter:

The reception strength is shown.

Servo operation of each

channel can be checked.

Model number

Telemetry data

Before Using

LCD Screen Contrast

The LCD screen contrast can be adjusted.

Caution

Do not adjust the contrast so that the LCD is too bright or too dark.

When the display cannot be read due to a temperature change, data cannot be set.

Alarm Setting if Tx is left switched ON

When the steering stick, throttle stick, push switch, or edit button are not operated for 10

minutes (default), an alarm sounds and "NOT OPERATED FOR A LONG

TIME" is displayed on the LCD screen.

When the steering stick, throttle stick, push switch, or edit button are

operated, the alarm is reset. If the system is not to be used, turn off the

power.

The function can be deactivated in the system menu.

Before Using

Throttle stick function Steering stick function

Left turn

Left

Right turn

Right

ForwardUP

Down brake or back

(　RC Car example shown　）

Servo operation of steer-

ing channel (CH1)can be

checked.

Servo operation of throt-

tle channel (CH2) can be

checked.

Throttle stick

CH2

Steering stick

CH1

Stick Operation CH1 CH2

(CH1: Steering stick, CH2: Throttle stick,)

Throttle Stick Function: Controls the speed of the model as well as the direction of travel

- forward or reverse.

Steering Stick Function: Turns the model right or left.

Before Using

Operation of CH3 can

be checked.

Operation of CH4 can

be checked.

Switch Dial Operation CH3 CH4

(CH3: Switch SW2, CH4: Dial DL1)

The three-position switch SW2 will result in the servo arm moving to three differ-

ent positions when operated.

Note that this function cannot be assigned to the spring return switch SW1.

Rotating the Dial (DL1) will proportionally control a servo on CH4. T he SW2

switch and DL1 dial can be assigned to either function.

Switch（SW1）The function cannot

be assigned to SW1

•The servo arm position and dial

do not necessarily always match

exactly.

T4GRS beeps when the

dial reaches center and

limit position.

Switch（SW2）

3position Return

SW2 　 3CH Servo DL1 4CH Servo

Dial（DL1）

Initial setting

ATL display

Steering D/R

display

Steering trim display

Throttle trim display

DT2 DT1

DT3

Steering

D/R

DT4 ATL

Brake amount

adjustment

Before Using

Trim Operation

Digital Trim Operation DT1 DT2

(Initial settings: DT1: Steering trim, DT2: Throttle trim,)

Operated by the lever: Push the lever to the left or right (up or down) The current posi-

tion is displayed on the LCD screen.

• Each step is indicated by a tone.

• When the trim exceeds the maximum trim adjustment range, the beep will change and the servo will not move

any farther.

• Trim lever adjustments have no effect on the maximum servo travel. This prevents the linkages from binding

when adjustments are made.

Digital Trim Operation DT3 DT4

(Initial setting: DT3; Steering D/R, DT4; ATL)

Operated by the lever: Push the lever to up or down. The current position is displayed

on the LCD screen.

• Each step is indicated by a tone.

• When the trim exceeds the maximum trim adjustment range, the tone will change pitch and the servo will not

move any farther.

With the center trim feature, trim adjustments have no effect on the maximum

servo travel. This prevents the linkages from binding when adjustments are made.

Before Using

Lever head Ｂ Lever head Ａ

Stick Lever Head Adjustment

The length of the lever head of the steering and throttle sticks can be adjusted.

Adjustment

1Unlock lever head "A" by turning it counterclockwise.

2Adjust the head to the length best for you, then lock the

heads by turning lever head "A" clockwise and lever

head "B" counterclockwise.

Set screws

Stick Mounting Angle Adjustment

The mounting angle of the throttle and steering sticks can be adjusted.

Setting

1Loosen the two set screws.

2Change the stick angle.

3Re tighten the two set screws.

• The ﬁgure at the right shows the throttle stick. The steering stick

can adjusted similarly.

Before Using

Steering stick adjusting

screw

Throttle stick adjusting

screw

Stick Tension Adjustment

Make this adjustment when you want to change the steering stick or throttle stick

spring tension.

Adjustment

1Remove the battery from the transmit-

ter.

2Using Phillips screwdriver, as shown in

a ﬁgure, four screws are removed, and

a rear case is removed.

• Don't touch internal electronic components.

3Turn the adjusting screw using a small

Phillips screwdriver such as a watch-

maker's screwdriver.

• Turning the adjusting screw clockwise, in-

creases the spring tension.

• The adjustment range is about five turns in

both directions, from the initial position.

4When the adjustment is completed, re-attach the rear case with a Phillips screwdriver.

• Take great care not to damage the wiring when re-attaching the rear case.

• Foreign substances must not be allowed to get into the interior of the case.

Caution

If turned too far counterclockwise, the adjusting screw may fall out.

Rear case

Before Using

High side

Brake (reverse) side

Stroke can be reduced mechanically.

Stick stroke adjustment

1Make this adjustment by turning the adjusting screw

above the stick with a Phillips screwdriver.

• When the adjusting screw is turned counter clockwise, the

stroke is reduced.

Mechanical Throttle Stick Stroke Adjustment

Make this adjustment when you want to reduce the throttle stick range at the full

power or brake/reverse positions.

2On the MENU2 screen, select the

setting item "ADJUSTER" using the

(JOG) button, and pressing the (JOG)

button.

3(Selection of THROTTLE)

Move the cursor to "THROTTLE"

using the (JOG) button up or down

function, and pressing the (JOG)

button.

HOME MENU1

Push

ADJUSTER

＊STEERING

[ RT ]

＊THROTTLE

MENU2

Select　

ADJUSTER

Select　

THROTTLE

Key

CANCEL

ADJUSTER

THROTTLE

N5 5

Key

CANCEL

ADJUSTER

THROTTLE

N5 5

N7 3

Key

CANCEL

ADJUSTER

THROTTLE

N5 5

N7 3

BRK

FWD

Key

CANCEL

ADJUSTER

THROTTLE

N5 5

N7 3

BRK

FWD

ﬁg-1

ﬁg-3

ﬁg-2

ﬁg-4

4 (Throttle 5:5 neutral adjustment )

Neutral adjuster is set to 5:5 the Neutral Adjuster switch (see

next page). In the 5:5 neutral setup screen (ﬁg-1) state, pull the

stick back slightly then allow to return to neutral and press the

(JOG) button whilst ensuring the stick is not touched.

5 (Throttle 7:3 neutral adjustment )

Neutral adjuster is set to 7:3 by the Neutral Adjuster switch (see

next page). In the 7:3 neutral setup screen (ﬁg-2) state, pull the

stick back slightly then allow to return to neutral and press the

(JOG) button whilst ensuring the stick is not touched.

Note that both the 5:5 and 7:3 neutral adjustment procedures

have to be completed as part of the set-up process. Once com-

plete the required option should be selected.

6 (Throttle throw adjustment)

In the throw setup screen state (ﬁg-3), gently move the stick fully

to the brake /reverse and full power positions and when button

Push

Before Using

Neutral Adjuster

Neutral Adjuster Operation

The neutral adjuster selects the throttle stick neutral position.

1Neutral adjuster is set to 5 : 5 when

in the upper position. It will be set

to 7 : 3 when moved to the lower

position

• If 7 : 3 is used, the neutral to full power

stick range is increased.

mark (ﬁg-4) is displayed, pressing the (JOG) button.

An internal check is performed automatically. When each adjust-

ment point is within a ﬁxed range, correction is performed and

"COMPLETE!" (ﬁg-5) is displayed.

If an adjustment point is not within a ﬁxed range, correction is

not performed and the correction data is not updated.

If the stroke is made too narrow, this will cause an error.

In that case, extend the stroke.

7When complete, return to the ADJUSTER screen by press the (JOG)

button.

8Next, move the cursor to [RT] by the (JOG) button, and press the (JOG)

button.

Key

CANCEL

ADJUSTER

THROTTLE

N5 5

N7 3

BRK

FWD

COMPLETE!

ﬁg-5

Caution

When the stroke is adjusted, the throttle servo travel should also be adjusted elec-

tronically. If the stroke is mechanically reduced too far the adjusting screw may

fall out.

When a neutral adjuster change

is made, be sure to carry out

system change.

Caution

2On the MENU2 screen, select the set-

ting item "SYSTEM" using the (JOG)

button, and press the (JOG) button.

Before Using

• "F10" should be selected only when using a ratchet on the

throttle stick. (for GP boats)

UP or DOWN

CONTRA

LHT-TM

BK-LHT

SYSTEM

[ RT ]

LHT-PW

BAT T DRY4

OPE-TM

BUZZER

TH-STK

DISP

ALL

10s

OFF

TLMTR

ENG

7 3

3(Selection of TH-STK)

Move the cursor to "TH-STK" using the (JOG) but-

ton up or down operation.

4 (Selection of your 4GRS neutral position)

Use the (+) and (-) buttons to select either 5:5 or

7:3.

5(Neutral position execution)

Press the (JOG) button for about 1 second. A beeping

sound is generated and the neutral position is select-

ed.

6When completed, return to the MENU2 screen by

pressing the (JOG) button.

7Next, move the cursor to [RT] using the (JOG) button,

and press the (JOG) button.

HOME MENU1

Push

CONTRA

LHT-TM

BK-LHT

SYSTEM

LHT-PW

BATT DRY4

OPE-TM

BUZZER

TH-STK

DISP

ALL

10s

OFF

TLMTR

ENG

5 5

CONTRA

LHT-TM

BK-LHT

SYSTEM

[ RT ]

LHT-PW

BAT T DRY4

OPE-TM

BUZZER

TH-STK

DISP

ALL

10s

OFF

TLMTR

ENG

5 5

MENU2

Press (JOG) about

1second

Selection of your 4GRS

neutral position

5:5

7:3

F10 (Next page)

Before Using

Changing to Ratchet Type Throttle Stick

Changing the throttle stick from the self-centering type to ratchet type that stops at

an arbitrary position. (To make this modication, the optional ratchet plate must be

pu rchased.)

Adjustment

1Remove the battery from the transmitter.

2Using Phillips screwdriver, as shown in a ﬁg-

ure, four screws are removed, and the rear

case is removed.

• Don't touch internal electronic components.

3Remove the swing arm, spring and

spring hook from the throttle stick as

shown in the ﬁgure.

• Retain these parts in case the stick is to be

changed back to self-centering type later.

4Install the ratchet plate to the throttle stick.

5Fasten by twisting the retaining tabs with

needle-nosed pliers.

• The V section of the direc-

tion of a ratchet plate is

downward.

• If the ratchet action is too harsh, a small amount of ser-

vo gear grease should be applied to the ratchet teeth.

Ratchet

plate

Rear case

Spring

Swing

arm

Spring

hook

Ratchet

plate

(Option)

6When the work is completed, re-attach the

rear case using a Phillips screwdriver.

• Take great care not to damage the wiring when re-

attaching the rear case.

• Foreign substances must not be allowed to get into

the interior of the case.

Caution

*If TH-STK is changed to F10 (see previous page), the now unnecessary brake function can be dis-

abled.

*If the throttle stick is not in the stop/idle position when the transmitter is switched "ON" an alarm will

sound. Ensure that the throttle stick is in the stop/idle position when switching "ON" - if the alarm

sounds the throttle output will default to stop/idle.

*The adjustment of the throttle range cannot be carried out if a ratchet is being used, only if the

throttle stick is self-centering.

Before Using

Warning

Antenna Moving Range

Position the antenna vertically

to the ground.

Antenna

A B

About The Transmitter Antenna

Position the antenna vertically to the ground.

In other positions the operating range may be reduced.

Never hold only the antenna.

Hold the grip handle. Otherwise, the antenna may be damaged.

The antenna position can be changed in the range as shown in ﬁgures A and B. However, please

do not apply unnecessary force or shock.

The internal cable may be damaged; thus transmitting distance is reduced and this may result in faulty operation.

About Transmitter Antenna and Receiver

WARNING

Caution

Antenna

tube

Antenna

Coaxial

cable

R304SB

Before Using

Always use R304SB,R304SB-E under the following conditions:

Battery :Power requirement Rated voltage 4.8~7.4V (dry cell battery cannot be used)

Matched to the ratings of the receiver and connected servo.

RX MODE :"T-FHSS(HIGH)" or "T-FHSS(NORM)"

Transmitter mode-"T-FHSS(HIGH)" mode :Futaba digital servo

Transmitter mode-"T-FHSS(NORM)" mode :Futaba all servo

Under other conditions, the set will not operate, or the speciﬁed performance will not be displayed even if it operates. In

addition, it may cause trouble with servos and other equipment. Futaba will not be responsible for damage, etc. caused

by combination with the products of other companies.

Receiver Installation

Install the R304SB receiver on the car as follows:

The operating range may reduced, depcompleted on where the receiver and the antenna

are mounted.

Do not cut or bundle the receiver antenna wire.

Do not bend the coaxial cable. It causes damage.

Install the antenna in the highest position possible as shown in the

ﬁgure.

Put the antenna in the antenna tube to protect it.

Keep the antenna as far away from the motor, ESC and other noise

sources as you possibly can.

Wrap the receiver with something soft, such as foam rubber, to

avoid vibration. If there is a chance of getting wet, put the receiver in

a waterproof bag or balloon.

Transmitter mode setting

Set the transmitter to the "T-FHSS(HIGH)" mode or "T-FHSS(NORM)" mode.

Note: Only digital servos (including BLS Series Brushless servos) can be used in the T-FHSS(HIGH) mode.

Receiver Terminology

Antenna Coaxial cable Link switch/LED

Connectors

4 :CH4 servo(CH4)

3 :CH3 servo(CH3)

2 :Throttle servo(CH2)

1 :Steering servo(CH1)

S.BUS2 :

Power /S.BUS2 connector

The receiver power supply can be connected

to the S-BUS2 connector or any of CH1-4.

*R304SB-E(for EP Car) has built-in antenna.

R304SB

B/C

CH3

CH2

CH1

CH4

Receiver

Switch

To Battery Steering servo

Throttle servo

CH3 servo

CH4 servo

Installation

Connect the receiver and servos as shown below. Connect and install the receiver and

servos in accordance with "Installation Safety Precautions" on the next page.

The gure shown below is an example. The method of connecting the motor controller

to the motor and battery depends on the motor controller used. Purchase the motor con-

troller and servos separately. The receiver also depends on the set.

Installation When An Electronic Speed Control Is Used

Installation For Gas Powered Models

Installation

Receiver and Servo Connections

Installation Safety Precautions

Warning

Installation

Receiver (receiver antenna)

Receiver vibration-prooﬁng / waterprooﬁng

Do not cut or bundle the receiver antenna wire.

Do not bundle the receiver antenna wire together with the motor controller lead wire.



Keep the receiver antenna wire at least 1cm away from motor, battery, and other wiring carrying heavy current.

Install the receiver antenna holder as closely as possible to the receiver.

If the antenna wire is cut, bundled, or routed near a noise source, the receiving sensitivity will drop, the running (sailing)

range will decrease, and you may lose control of the model.

*Noise is transmitted through metal, carbon, and other conductive material, so keep the receiver antenna wire away from such parts.

(Car)

Vibration-proof the receiver by wrapping it in foam rubber or other vibration-absorbing material

and mount it with thick double-sided tape.

When using the receiver holder supplied with the model kit, mount the holder to the chassis

through a rubber grommet.

(Boat)

Vibration-proof the receiver by wrapping it in foam rubber or other vibration-absorbing material.

Also waterproof the receiver by sealing it in a plastic bag.

If the receiver is exposed to strong vibration and shock, or suffers from water leakage, reliable operation may be lost and

you may lose control of the model.

Screw

Mechanical plate

Nut (as required)

Receiver holder

Damper

When using the receiver holder sup-

plied with the kit, install the receiver

holder using rubber grommets to re-

duce vibration.

Foam rubber, etc.

Wrap the receiver in foam rubber or oth-

er vibration-absorbing material. Do not

use hard material. Hard material does not

have a vibration-proong effect.

Mechanical plate Thick double-

sided tape

When mounting the receiver with double-sided tape,

do not use a stiff tape. Stiff tape does not have a vibra-

tion-proong effect.

#%$

Antenna

Install the receiver as far away as possible from the

battery, motor controller, motor, silicon cord and

other noise sources. Keep it away from the antenna

wire, in particular.

Battery

Warning

Installation

Connector Connections

Servo Installation

Be sure the receiver, servo, battery and connectors are fully and ﬁrmly connected.

If vibration from the model causes a connector to work loose while the model is in operation, you may lose control .

When you install the servos, always use the rubber grommets provided in servo hardware bags.

Mount the servos so they do not directly come in contact with the mount.

If the servo case comes in direct contact with the mount, vibration will be directly transmitted to the servo.

If this condition continues for a long time, the servo may be damaged and control will be lost.

Servo Throw

Operate each servo over its full stroke and be sure the linkage does not bind or is loose.

The continuous application of unreasonable force to a servo may cause damage and excessive battery drain.

Screw

Mechanical plate

Nut (as required)

Eyelet

Damper

(or)

When installing the servo, always install the accessory

rubber grommet and grommet ush against the servo.

A vibration-damping effect is not obtained if

the rubber grommet and grommet are not in-

stalled correctly.

Adjust the throttle servo so that excessive force is not

applied when the engine carburetor is fully open, fully

closed, and the brakes are applied fully.

If the brakes overheat while running, their ability to

function properly decreases. Before running, adjust the

suitable maximum servo travel so that excessive force

is not applied even when the servo travel is increased

while running.

Adjust the steering servo so that excessive

force is not applied to the servo by the chas-

sis at maximum servo travel.

Decide the EPA value at the

contact point.

Caution!

A whining noise indicates that the

steering servo is improperly set.

Warning

Installation

Electronic Speed Control

Motor Noise Suppression

Install the heat sinks where they will not come in contact with aluminum, carbon ﬁber or other

parts that conduct electricity.

If the FET Amp (Electronic speed control) heat sinks touch other materials that conduct electricity a short circuit could

occur. This could result in loss of control and damage to the system.

Always install capacitors to suppress noise when electric motors are used.

If capacitors are not properly installed you could experience erratic operation and reduced range as well as loss of con-

trol.

Other Noise Suppression Methods

Be sure there are no metal parts in your model which under vibration can come in contact with

other metal parts.

Metal to metal contacts under vibration will emit a high frequency noise that will affect the receiver's performance. You

could experience erratic operation and reduced range as well as loss of control.

Motors with no suppressor capacitors, or inade-

quate suppression, may cause the receiver to mal-

function. Always solder the capacitors supplied to

your motor.

The Schottky diode improves the efciency of the

speed control / motor combination and provides

extra protection to the brake FETs. The white ring

must always face the positive side.

Schottky diode

"-" side

"+" side

1 2 3

Initial Set-Up

Before setting the Transmitter functions, check set the following items rst.

Initial Set-Up

Preparations (Transmitter)

(Display when power switch turned on)

When the power switch is turned on, the currently selected model number is displayed.

Check if this number is the model number you want to set-up. To change the model

number, use the Model Select function.

(HOME screen)

Turn on the transmitter power.

The model number is

displayed.

The battery voltage is

displayed.

Receiver Type Check (RX MODE)

This mode sets the RX type of the transmitter to match the receiver and servos used.

The T4GRS transmitter uses the telemetry type T-FHSS ("TFH") system.

It can also use the conventional FHSS and S-FHSS ("SFH") systems. Because the

R304SB(-E) receiver supplied with the T4GRS uses the telemetry type T-FHSS ("TFH")

system, its RX type must be set to the T-FHSS high speed mode ("TFH-HI") or the T-

FHSS normal mode ("TFH-NR"). Never use analog servos when the RX type was set to

the T-FHSS ("TFH") 2.4GHZ system high speed mode "TFH-HI" or the S-FHSS (SFH)

high speed mode "SFH-HI". The servos may be damaged. For example, if analog ser-

vos are used with a telemetry type T-FHSS receiver (R304SB, etc.), the RX type must

be set to "TFH-NR", and if analog servos are used with an S-FHSS receiver (R2104GF,

R204FG-E, etc.), the RX type must be set to S-FHSS ("SFH-NR") system normal mode

or FHSS ("FHSS") system. When using digital servos (including BLS Series brushless

servos), any RX type can be used.

When a dedicated FHSS receiver (R603GF/R2004GF) is used, it will not operate if the

RX type is not set to "FHSS".

FHSS T-FHSS Normal speed

T-FH (NORM)

S-FHSS Normal speed

S-FH (NORM)

T-FHSS High speed

T-FH (HIGH)

S-FHSS High speed

S-FH (HIGH)

Push

Select "RX MODE"

by (JOG) button.

Push

Select TYPE with

the (+) or (-) but-

ton.

Select RX type with the (+)

or (-) button.

Press the (JOG) buttons

continuously for approxi-

mately 1 second.

(+) button (-) button

(JOG) button

DISP

DOWN

Initial Set-Up

If the receiver used and the RX type settings are different, change the RX type using

the "RX MODE" function. Which RX type is set can be checked at the HOME screen.

Receiver Type Change & How To Link

The rst operation described below sets the RX type. Next, the transmitter and receiver

are linked and the transmitter ID number is memorized at the receiver so that signals

from other transmitters will not be received. The telemetry type T-FHSS also simultane-

ously memorizes the ID number of the receiver at the transmitter so that data from other

receivers will not be received.

The RX type setting and transmitter and

receiver linking methods are described

here. Refer to the figure at the right for

the edit buttons used.

1Set the transmitter

power switch to DISP.

Select "RX Setting"

using (JOG) button

up or down opera-

tion, and display the

"RX MODE" screen

by pressing the (JOG)

button.

2Move the cursor to "TYPE: ----" using (JOG) button up or down operation, and select the

RX type with the (+) button or (-) button.

When the (JOG) button is pressed for approximately 1 second, an electronic sound is

generated and setting ends.

R304SB

(Error screen)

Initial Set-Up

*When using an FHSS (R603GF/R2004F, etc.) or S-FHSS(SFH) system (R2104GF,

R204GF-E, etc.) receiver, after the end of setting up to here set the transmitter power

switch to OFF and go to "Receivers other than T-FHSS" .

3Bring the transmitter and receiver to within 50cm of each other (do not allow the anten-

nae to touch) and turn on the receiver power.

4Move the cursor to "LINK: EXE" by (JOG) button up or down operation.

When the (JOG) button is pressed

for approximately 1 second, "PUSH

RX LINK SW" appears on the

screen and 20 seconds countdown

begins. Countdown can be can-

celled at any time using button up

down or left right operation.

5During 20 seconds countdown,

press the receiver link switch for approximately 2 seconds. The LED will begin to blink

red. After the receiver LED switches from blinking red to green-red steady light, the

T4GRS generates an electronic beeping sound, and "LINK:OK" and "COMPLETE!" ap-

pear on the screen, reading of

the mutual IDs ends and the

memorized receiver ID num-

ber appears on the T4GRS

screen. If an error screen was

displayed, linking failed. Retry

linking. If the transmitter and re-

ceiver are linked normally, set

the power switch to the OFF

position and then return it to

the PWR ON position. If the receiver LED lights green, linking was successful. Check for

correct servo operation.

*The T4GRS and a telemetry type T-FHSS receiver (R304SB, etc.) mutually memorize

the combined ID linked last at each model memory.

Since the T4GRS can memorize only 1 receiver ID at each model memory, multiple T-

FHSS receivers cannot be used with the same model memory. If the same model mem-

ory is used for more than one model it will be necessary to re-link the receiver’s each

time a different model is operated.

When using multiple telemetry type T-FHSS receivers, link and combine them with each

T4GRS model memory.

Note however that, multiple receivers cannot be linked to multiple model memories.

The telemetry function communications status can be checked at the T4GRS HOME

screen.

Telemetry function :OFF- Telemetry function :ON

- Receiver ID before setting or ID mis-

match

- When the receiver ID is set, before

ID check in the receiver power OFF

state.

- Telemetry function :ON

- Receiver ID setting complete

- Data receiving sensitivity display

- shows that data cannot be re-

ceived because it is outside the data re-

ceiving range or because of the effects

of an obstruction or the receiver power is

OFF after receiver ID check.

The reception strength

No signal reception

High

Low

Receiver -> Transmitter:

The reception strength is shown.

Initial Set-Up

Receivers Other Than T-FHSS

1Bring the transmitter and the receiver close to each other,

within 20 inches (half meter).

2Turn on the transmitter.

3Turn on the receiver.

4Push the link switch of the receiver.

When the link is complete, the LED in the receiver changes

to solid green.

Precaution:

If there are many Futaba 2.4GHz systems (T-FHSS/ S-FHSS/ FHSS) turned on in close proximity to your re-

ceiver then it might not link to your transmitter. In this case, even if the receiver’s LED stays solid green, unfor-

tunately the receiver might have established a link to one of other transmitters. This is very dangerous if you do

not notice this situation. In order to avoid the problem, we strongly recommend you to double-check whether

your receiver is really under control by your transmitter by giving the stick input and then checking the servo

response.

*Please refer to the table below for LED status vs receiver's condition.

LED status vs receiver’s condition:

Warning

After the linking is done, please cycle receiver power and check if the receiver to be linked is re-

ally under the control of your transmitter.

Do not perform the linking procedure with the drive motor connected or the engine operating as it

may result in serious injury.

The telemetry ON/OFF and communication status can be checked at the HOME screen.

No signal reception Red : On

Receiving signals Green: On

Receiving signals, but ID is unmatched. Green: Blink *1 (T-FHSS ,Red : On)

Unrecoverable failure (EEPROM,etc.) LED: Red and Green turn on alternately

*1: LED could be change to red intermittently during data processing.

Throttle trim (DT2)

Steering trim (DT1)

Steering trim

Throttle trim

F5/B5 or F7/B3

5 : 57 : 3

F5/B5 F7/B3

Forward side Brake side Forward side Brake side

Initial Set-Up

Trims Initial Set-Up

- Steering trim (DT1) check

On the initial set-up, steering trim is assigned to the DT1 trim lever. Operate the lever

and make sure the marker moves on the ST graph. If default has been changed, test

steering trim in its new location. After checking the trim, set the trim display to the cen-

ter (N) position.

- Throttle trim (DT2) check

On the initial set-up, throttle trim is assigned to the DT2 trim lever. Operate the lever

and make sure the marker moves on the TH graph. If the default has been changed, test

the throttle trim in its new location. After checking the trim, set the trim display to the

center (N) position.

Throttle Mode Check

The throttle servo travel can be set to 5:5 or 7:3 for throttle stick operation as required

by the throttle mode function .

*This function is not available in "TH-STK : F10 mode".

Throttle ATL

Steering dual rate

Steering dual rate DT3

Throttle ATL DT4

Initial Set-Up

(Set-Up Procedure When Installed In a Car)

When installing the servos in a car, performing function set-up in the following order is

recommended.

1Carry out the Trims Initial Set-up as described on the previous page.

2Set the servo direction of operation using the Reverse function.

- The servo installation method and linkage direction depend on the kit. Therefore, the servo

operation direction may have to be reversed relative to transmitter operation. Before install-

ing the servo, check the operating direction and set it using the Reverse function.

3Set the subtrim and adjust the servo neutral point.

4Set the throttle stick travel by adjusting the throttle stick mechanical ATL

to your liking.

- When the throttle stick travel is changed, set the servo travel as required using the adjuster

function.

Set EPA of each channel and adjust the servo throw (travel).

- Steering dual rate (DT3) check

At initial set-up, steering dual rate (D/R) is assigned to the DT3. Operate the lever and

check if the D/R value displayed on the screen changes. After checking D/R, set the

steering dual rate to 100%.

- Throttle ATL (DT4) check

At initial setting, throttle ATL (ATL) is assigned to the DT4. Operate the lever and

check if the ATL value displayed on the screen changes. After checking ATL, set throt-

tle ATL to 100%.

(+) button is pressed

Pres

(-) button is pressed

Pres

(JOG) button is pressed

(+) button (-) button

(JOG) button

Pres

(JOG) button up

(JOG) button down

(JOG) button left

(JOG) button right

(JOG) button up, down, left or right

Pres

(DISP MENU screen)(MENU 2 screen)(MENU 1 screen)(HOME screen)

On the MENU1 or 2 screen, move the

cursor to [RT] by (JOG)button up or

down operation and press the button.

On the DISP MENU screen, move the cur-

sor to "FUNC MENU" by (JOG) button up

or down operation and press the button.

Function Map

Operation Of Screen

In this instruction manual, Edit Buttons are represented by the symbols shown below.

The (JOG) button can be operated in the 4 directions up, down, left, and right.

Selecting The Menu Screen

Refer to the map below for the method of displaying the function setting menu screen

from the PWR ON initial screen or DISP (display) screen and the method of returning

from the menu screen to the PWR ON initial screen or DISP (display) screen.

Futaba T4GRS-24G Radio Control User Manual Part 1

Futaba Corporation Radio Control Part 1

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