Darfon BESV JF1 User manual

1
Safety Statement Consistency
Dear customers,
Darfon Electronics Corp. is a company located in Taiwan. Our products sold in the market are developed
based on innovated ideas and structures. The following is the description of the product:
Product: Pedal-assisted electric bicycle, E-Bike
Function: Pedelec
Model: BESV JF1
This product is designed based on unified European standards and observes applicable and important EU
directives. The EU directives involved are shown below, including any amendments that are in place:
•2006/42/EC on machinery, including EN 15194:2009 + AI:2011 + IEC 62133:2002
•EMC Directive 2004/108/EC, including EN 15194:2009 + AI:2011
•2006/42/EC on machinery, including EN 15194:2017
The battery charger of the product is described as follows:
Product:Battery charger
Function: Battery charger for the electric bike
Model: BESV-072-0360
The product is designed and manufactured based on EU, USA and Australian Communications and Media
Authority (ASMA) standards, as well as relevant and important directives of EU.
•EU Low-Voltage Directive IEC 60335 and Electromagnetic Compatibility Directive EN 55014
•USA Directive UL 1012 and FCC Part 15B
•Australian RCM Directive AS/NZS CISPR-14
Modification of this bike without our prior approval will render the warranty invalid. PS: Darfon Electronics Corp.
is short for Darfon Electronics Corp. Corporation.
Original instruction

2
Introduction Start Riding
It is advised to read this user's manual thoroughly and familiarize yourself with the operations of the
bike before riding it for the first time. Please follow the instructions and warning provided in this
manual. Failure to do so may lead to damage to the bike or risk of your personal safety. This user's
manual provides you quick and accurate understanding of the major functions of your electric bike.
Your bike may be somewhat different from the descriptions and images depending on model, order,
country or optional accessories. Darfon Electronics Corp. is committed to constantly innovation of
craftsmanship and products, and reserves the rights for changes in following parts, such as design,
electronic system and features of equipment or technology. If you are to sell your bike to another
user, please pass this manual onto him/her. Darfon Electronics Corp. and its team hope to bring you
safe and pleasant riding experience.
Environmental Protection Topics
Environmental protection topics are part of green product policy published by Darfon Electronics
Corp.. The purpose is to encourage cautious use of natural resources, which are the building blocks
of the plant we live on, and to take the needs of nature and human being into consideration. As a
responsible person for environmental protection, you may protect the environment by starting to ride
an electric bike.
The consumption of energy is related to the power controller system, gear change system, brake
system, drive system and tires installed on the bike. It all depends on how the electric bike is used
and how you ride the bike. In addition, it is advised to keep in mind the potential influences of how
the bike is used and how you ride the bike on environmental protection.
How the bike is used
• Make sure the tire pressure is normal.
• Do not carry extra weight that is unnecessary
• Pay attention to battery consumption
• Riding the bike as it is intended to helps protect the environment
• Have anauthorized professional distributor perform repair or service toyour bike.
How you ride your bike
• Ride the electric bike carefully and keep a proper safe distance with the vehicle in the front.
• Avoid frequent, sudden acceleration.
A reminder for environmental protection: Recycle the waste
battery for greener world. Please go to an authorized bike
distributor for repair and service.
E
n
g
li
s
h

3
Production Information
Darfon Electronics Corp. recommends you to use the power controller system, gear change system,
brake system, drive system and electric bike parts recognized and approved by Darad Innovation.
Darfon Electronics Corp. has a series of rigorous tests and verification processes on these systems
and electric bike parts to ensure the reliability, safety and comfort of the product. Darfon Electronics
Corp. is not in the position to evaluate other parts despite existing survey reports available in the
market. Therefore, Darfon Electronics Corp. is not responsible for using these parts on our products.
Do not use parts that are not approved by Darfon Electronics Corp., as they may compromise the
safety of you riding the bike.
Approved parts and replacement service, as well as technical advices, are available at
professional distributors authorized by Darfon Electronics Corp.. In a professional sense,
these parts are fit for your electric bike.
User'sManual
Please read this manual carefully before riding this bike for the first time, and allow yourself to
familiarize with this bike. For the safety and longevity of your electric bike, please follow the
instructions and warnings given in this manual. Failure to do so may result in damage of the bike or
risk of your safety.
You may select an electric bike that meets your specific needs based on the model and standards
provided in the manual, but there may be slight differences depending on countries. In some cases,
your bike may not have all the features described for it due to system, function and safety.
Therefore, your bike may be somewhat different from the descriptions and images. For any question
regarding the bike itself and how it is operated, please consult with your professional distributor
authorized by Darfon Electronics Corp.. The following are covered in the delivery of the electric bike:
• Battery
• Charger
• User's manual
Ride Safely
• Important safety warning
• Accidents or fallingobjects
• Tipping over of bike
The following ways of riding may lead to sudden malfunction of parts; for example:
• Damage of handle bar or saddle when riding the electric bike
• Malfunctioning brake
These present the risks of accident and injury. When something like this happens, it is important to
have your bike checked by a professional distributor authorized by Darfon Electronics Corp.
immediately. When riding the electric bike, the bike is subject to heavy loads and wearing. Parts
respond to these loads differently, and fatigue and wears are possible at various speeds. If the life
cycle expires, the part may fail suddenly and there is a risk of accident or injury.
E
n
g
li
s
h

4
• Please have a professional distributor authorized by Darfon Electronics Corp. perform routine
checkups on yourbike.
• Check for signs of cracks, scratches orcolor change, since any of these are indications that the
part may be expired.
• Have a professional distributor authorized by Darfon Electronics Corp. replace the fatigued or
worn part(s).
Parts that may be compromised are:
• Handlebars andstem
• Saddle and seat post
• Frame and fork
• Tyres andwheels
• Pedals and Pedalcranks
• Brake Pads anddiscs
• Chain
• Battery
The electric bike and the power controller system may cease to function if handled incorrectly.
Modification to the power controller system may lead to the inability to correct the system back to
normal and eventually malfunction. A power controller system that does not work properly will
compromise your safety while riding the electric bike. Therefore, you should always go to a
professional distributor authorized by Darfon Electronics Corp. for service of used and
malfunctioned parts.
Do not perform any servicing or machining work on the bicycle frame or any of the load-bearing parts on
your own, such as drilling, welding or forging. These behaviors will impact the service life of the parts and
the stability of use. In addition, part of your body or clothing may be caught in moving or rotating parts
such as wheels, chain, pedals or pedal cranks. Make sure that any part of your body, clothing or objects
you are carrying will not be caught in these parts as they are moving or rotating. Also, scarf is not
recommended.
A few parts on this bicycle may become very hot after braking, such as the braking system, front
fork quick release, fast rotating electronic control system and the nut on the axle, particularly after
long hours of riding. Touch these parts only after they cool down. It is not allowed to ride the e- bike
without an operational lighting system. This is the law in many countries.
Qualified and Authorized Professional Ser vice
A professional distributor that is qualified and authorized has the skills, tools and qualification to
provide service for your electric bike, in particular when it comes to the safety of riding the bike.
Therefore, it is advised to go to a qualified and authorized distributor for the following services:
• Safety-related service
• Maintenance andservice
• Repair
• Correction, installation andupgrade
• Replacement of electronic components: power controller system, gear change system, brake
system and drivesystem
• Darfon Electronics Corp. recommends that you go to an authorized professional distributor for
service and repair in order to keep your electric bike in a good working condition.
E
n
g
li
s
h

5
Correct Use
Familiarize yourself with the following information before riding your electric bike:
• Safety notes given in the user's manual
• Technical data provided in the user's manual
• Traffic regulations and rules
• Legal and safety standards regarding electric bikes
The structure of the e-bike should comply with the regulations of your country when you bought
it. Or, it may be illegal in your country to ride this e-bike. The structure of this bicycle may be
adjusted to the regulations of individual country if necessary. Please read thoroughly the laws
and regulations applicable to e-bikes for the following key points:
• The power output of the motor and the maximum aided speed
• Accessories required to ride on highway
• Obligation to have a license
• The minimum age to ride an electric bike legally
• Requirement to wear a helmet while riding
The e-bike is designed for riding on roads and alleys with asphalt pavement. The tires maintain their
traction on such a pavement. However, this bicycle is not designed to ride or jump over obstacles
such as the curbs on roadsides. Similarly, it is not designed to carry more than one (1) person, i.e.
no passenger other than the rider him/herself. Besides, it is not a racing bicycle .
The e-bike is capable of carrying 95kg (209lbs) including the rider, accessories and luggage. Do not
carry more than the total weight allowed. The BESV e-bike is not designed to be a towing vehicle,
nor allowed to ride behind a towing vehicle, tow another bike or pull another bike with a bike linking
system.
Make sure that your e-bike is used correctly as it is intended. If the bike is not used in the way it is
designed to, the parts may break down, leading to accident or injury.
The e-bike is not intended to set limits on the size, senses or intelligence of certain people. However,
children under 14 are not recommended to ride this bike.
rear-mounted or portable design. Therefore, please remove the battery before the bicycle is
transported. In addition, it is recommended to remove parts that cannot be fastened with bolts
before transportation, such as the gauge, as they may become loose and missing during the
transportation.
Electric Bike
The electric bike of Darfon Electronics Corp. is an electrically assisted bike that provides assistance
when you are pedaling. The rpm sensor located on the pedal crank bearing detects how hard you
are pedaling the bike and determines how much power the motor should provide to give you a ride.
The electric motor is turned off as soon as you stop pedaling. At the maximum aided speed, the
motor starts to reduce its power output until the aided pedals are turned off. For example, the
maximum aided speed is 25km/hr (15.5mph) in European countries. You may ride faster than this
maximum aided speed if you turn off the assisted pedaling function.
E
n
g
li
s
h

6
Torque sensor on the Bearing of Pedal Cranks
The torque sensor that determines the pedaling force may lose its electronic calibration
and that leads to the malfunctioning of assisted pedaling. Therefore, keep magnetic and
metal objects, such as a hammer, away from the crank bearing.
The Serial Number of New Darfon Electronics Corp. Bike is in the Warranty Card
The serial number of your new Darfon Electronics Corp. bike and its frame number
validate your after- sale (warranty) service. Therefore, check that the serial numbers of
the bike and the frame are intact when you are going to buy a bike. Do not buy a bike
with a sign that these numbers are tampered with!
• The new bike serial number is found in the warranty card.
• The frame serial number is found on the base of bottom bracket shell, the rear
drop-out of the frame, or downtube.
E
n
g
li
s
h

7
JF1 Over View
Component introduction:
1. Saddle
2. Seat post clamp
3. Front wheel
4. Front brake DISC
5. Front brake caliper
6. Battery
7. Pedal
8. Chain wheel set
9. Chain
10. Rear derailleur
11. Freewheel
12. Rear wheel
13. Electric motor
14. Rear brake caliper
15. Rear brake caliper
Component introduction :
1. Left handle bar
2. Rear brake lever
3. Function switch
4. HMI bracket
5. HMI
6. Front brake lever
7. Right handle bar
8. Derailleur lever
9. Power button

8
HMI Instuction:
1. Backlight
adjustment
2. System-setup
button
3. Assistance power
indicator
4. Battery capacity
5. USB-charging
indicator
6. Bluetooth-
connection indicator
7. Assistance mode
8. Riding information
9. USB charging port
Assistance adjustment
Function
1. Change riding information
/ Setting entrance
2. Assistance mode +
3. Assistance mode –

9
Inspection Before Your Riding
Tire and Wheel Inspection
•Before your riding, please check the tire pressure and notice
that there is any objective pierced the tires.
•The tire pattern will be obvious.
Brake System Inspection
• Before your riding, please test the function of brake system.
When you pull the brake lever, the brake force should work and
the space should be kept between the brake lever and the grip.
• Any mud or grease on disks is forbiddened.
• All screws ahould be mounted on the positions.
Chain Inspection
• Before your riding, please check the chain is exactly mounted
onto the chainwheel or freewheel.
• Please follow the instruction to prevent damage of the chain
system when the chain is settled down or removed.
Battery and the lock inspection
• Before your riding, please check the battery is locked and the
indicator show “Lock”.

10
Power on/off inspection
•Sytem On: Long press the power button. You can see
thepower button shows in blue and HMI shows the start-up
image.
•System Off: Long press the button until the light of power
button off and the HMI shows the shut-down image.
Alos, you could customize the riding information for yourself.
Please follow the instruction as below:
Check the Bolted Parts
Check that the following parts are tightly secured every time before you ride a bike:
• Check the coupler of front wheel quick release is secured in place and the word “CLOSED” is
clearly visible. It shall not rotate.
• Check that the rear wheel and motor are installed and secured properly. All bolted connections
shall be fastened so tightly that they do not budge under extra pulling or pushing of the rear wheel.
• Check that handle bar and brake levers are secured in place. It shall be impossible to rotate the
handle bar and brake levers.
• Make sure that the saddle and seat post are secured in place. The attempt to pull or incline the
saddle shall not cause it to move.
• Check that the luggage carrier is secured in place.
• All bolted connections shall be fastened securely.

11
Adjustment
Saddle adjustment
•If you pull the seat post and the seat tube is too far away, the
screw clamp may not support the seat post safely. Do not
exceed the minimum insert depth when pulling the seat post.
•Adjust saddle height and position Minimum insert depth: the
seat post has to be inserted at least 10cm (3.9”) into the seat
tube no matter how it is marked
•Adjust the saddle position depends on yourself requirement,
but do not exceed the mark on the saddle.
Handlebar and Grip Adjustment
Adjust the grips, brake levers and gear change levers Adjust
the handlebars so that they fit snugly in your hands, and move
them to the position that fits you. Adjust the brake levers so that
they make proper contact with the handlebars. A proper
distance shall be kept between the handlebar and brake
lever.The gear change lever is located below the handle bar
where your thumb can easily control.

12
Function in Main page
• As battery remaining indicator, each section represents 20%
capacity. For example, the remaining capacity was displayed as
followings:
5 sections : 100%
1 section : 20%
1 section with flashing : below 10%
1 section with battery icon flashing : below 5%
• To adjust the backlight, please press the button which
is at the side with icon.
• To change the different riding information, please press the
button which at the side with icon.
P
S
+
+
+
Changing Assistance mode
• The assistance mode can be changed by pressing the button
"Assistance mode +" and "Assistance mode –" sequentially. The
current mode can be distinguished by both letter symbol and
colors.
'E' is for "ECO mode" with blue color
'S' is for "Smart mode" with purple color.
'P' is for "Power mode" with red color.

13
Riding Information:
• Speed : The speed of the bike.
• ODO : Total experienced distance.
• Power : The inputting human
power.
• Clock : The current time.
• Calorie : The exhausted calorie
during a trip.
• RPM : The cycling cadence.
• MAX : The maximum speed during
a trip.
• AVG : The average speed during a
trip.
• Trip : A total distance during a trip.
• Range : A remaining range which is
estimated by recent riding behavior
and environment.

14
The menu page
This page is a menu of all the function settings of system.
•To enter this menu page, please long-pressing the information button .
•After entering the menu page, you can use "assistance mode +" and "assistance
mode –" to change the selection, and press the information button again to
enter the next page.
If you want to leave menu page, please move your selection to "to main display",
and press the information button to return main page.
About me
This function is to show the software information of controller, HMI and battery.
•Move the selection to "to menu" and then press the information button go back
main menu page.
Clear trip data
This function is for clearing trip record
•Move the selection to the "clear" and then press the information button .
•Move the selection to "to menu" and then press the information button to
go back main menu page.
•Clearing trip data will also clear "calorie", "Max speed", "Average speed"
information.

15
Change unit
This function is for changing the displayed unit.
•Move the selection to the unit you want and then press the information
button .
•Move the selection to "to menu" and then press the information button
go back main menu page.
Time setup
This function is for changing 12/24 hours method to represent.
•Move the selection to select "24h" or "12h" and then press the
information button .
•Move the selection to the "hours" and then press the information button
. The "hours" will start to flash and be able to adjusted by "assistance
mode +" or "assistance mode –" buttons. When you finish the adjustment,
please press the information button again to confirm.
•You can adjust the "minutes" as the same process as "hours".
•Move the selection to "ok" and then press the information button to
finish the setting.
•Move the selection to "to menu" and then press the information button
go back main menu page.
Riding information selection
By Info selection, you can multi-choose you mostly used information to show on
main display.
•Move the selection to information you want, and then press the information
button to select. You can do this repeatedly until all your necessary
information is selected.
•You can choice page 1 and page 2 of info selection by select "next" and "back".
•Move the selection to "set/ok" and then press the information button to
complete the setting.
•Move the selection to "to menu" and then press the information button go
back main menu page.

16
Bluetooth
This function is to enable the Bluetooth to connect with smart phone device.
•Move the selection to select "on" to enable Bluetooth, or "off " to disable
Bluetooth.
•Move the selection to "ok" and then press the information button to finish
the setting.
•Move the selection to "to menu" and then press the information button go
back main menu page.
Warning message
•If the message is shown as "W" and followed by a number, it
represents a warning code.
•Please refer to the trouble shooting in the later chapter of this
manual.
Error message
•If the message is shown as "E" and followed by a number, it
represents an error code.
•Please refer to the trouble shooting in the later chapter of this
manual.
•If more than 1 message existed, these messages will keep flash and alternatively displayed.
The lower assistant adjusted condition:
The system will deudce the assistant level to protect the eleteric module uder the battery overloading or
at high temperature.

17
Replacement of new brake padsBrake System
The Darfon Electronics Corp. Electrically Assisted Bikes are all equipped with mechanical disc brake of the
same level. It brings you quick and safe stop if necessary. The disc brake reacts much quicker than drum
brake particularly on slippery roads. The mechanical disc brake gives you very good braking results with
only very little force from your hands. To evenly distribute the braking force in both wheels, please brake
both wheels at the same time. The following are some notes for braking the bike:
•On a slippery road, the friction is reduced between the surface and tires. The water reduces the braking
effects of the brake shoes and disc. As a result, the braking distance will be longer and there is a risk of
accident.
•When riding on a wet surface, brake early to keep a longer braking distance. Be extra careful not to allow
the brake to lock the wheels up.
•The rear wheel may be airborne when you hit the front brake too hard, and there is a risk of accident.
•Always slow down or stop the bike with both the front and rear brakes. Carefully maintain your balance
during a sudden brake.
The motor-assisted pedals are brake-controlled (or if you stop pedaling) for interruption. If you are not yet
familiar with the braking power of the mechanical disc brake, please do so on a surface with good traction
and away from traffic. Avoid braking consecutively. When on a long down slope, use both brakes in a steady
burst of short braking actions. The brakes will cool down when you apply them intermittently. Stop the bike
at any sign of overheating. The symptoms of overheating include extra braking force required, a
concentration of burning smell and loud noises.
Allow the braking system to cool down before riding. A wet condition reduces the braking effect and easily
causes the tires to skid.
Always keep a longer braking distance on a wet road surface. Ride slowly and brake carefully.
Wearing of Brake System
The wearing of brake shoes and discs is the result of friction. The more you ride the bike in a mountainous
terrain or in rain or mud, the more worn the bike will be. The wearing of brake shoes and discs cannot be
evaluated from the brake rods alone. Therefore, it is necessary to check before riding. Always go to a
qualified distributor for replacement of brake shoes.
New brake shoes must be inserted when they reach their best braking performance. To do that, you need to
accelerate the bike up to 25km/hr (15.5mph) and apply the brakes. The replacement is done when the force
you apply to the brakes stop reducing

18
Battery
Install or Uninstall the battery
•Install: Please open the battery cover. Hold
the battery and insert it by connector to
connector. Please check the fixing, and then
close the battery cover and turn the key to the
“CLOSE”.
（note: if you install the battery correctly,
there will be a sould “click”）
•Uninstall: Please open the battery cover. Turn
the key to “OPEN”. Take out the battery form
the chamber and close the battery cover.
•If the connection of the battery is not correct,
there might be something dangerous. Be sure
following the instruction to install the battery.
Battery Protection Mode
For any of the following, the battery will switch to the protection mode:
• The bike has not be used for two months.
• The battery has depleted and not charged within one week.
When the battery is in the protection mode, you need to start the battery after a complete
charging cycle.
Notes for Battery
The following instructions help improve the longevity of battery:
• Ideally, the battery should be charged at 20°C (68°F). Please allow plenty of time for the
battery to reach this temperature before charging.
• Avoid frequent discharging completely. It is preferred to discharge locally. Li batteries are
not known for the memory effect. Loss of capacity after a period of use is common in
every Li battery. The oxidation of cores occurs as the result of long period of use and
aging, and leads to loss of capacity.
• Deep discharging of a battery will lead to irreversible damage and loss of capacity. If the
battery is expected not to be used for an extended period of time, it is advised to charge
the battery to its full capacity at least every 3 months.
Important Safety Notes for Batter y Charging
• If the power cable or plug is damaged, wet or dirty, there is a risk of electric shock or even
mortal injury.
• Use only the battery charger delivered with the product.t.
• Use only dry charger, undamaged power cable and charger.
• Replace damaged power cable and charger immediately.
• Remove any possible foreign object from the charging socket, such as dusts, ice or snow
before plugging in.
• Using any battery charger other than the one delivered with the product may cause
overheating of the battery or even a risk of explosion.
• Deep discharging of battery may result in internal damage.
• There is a fire risk if the temperature of battery rises up to a dangerous level.

19
• Avoid deep discharging of battery while in use or storage.
• If not in use, the battery should be charged fully at least every 3 months.
• Do not expose the battery in a storage temperature lower than -20°C (-4°F) or higher than
60°C (140°F). Please note that the internal structure of battery may be overheated to
damage due to high temperature greater than 60°C, particularly exposed to direct sunlight.
• Do not use the charger at a humid place or an ambient temperature lower than -10°C
(14°F) or higher than 40°C (104°F).
• Do not put the battery in water.
• The battery and charger are maintenance-free. Do not attempt to disassemble or modify
the battery or charger.
• Do not expose the battery to high voltage.
• It is advised not use battery with damaged casing.
• Keep the battery out of children's reach.
• If you detect that the battery becomes very hot, emits a strong odor, starts to deform or
performs in an unexpected way while in use, being charged or in storage, please stop
using the battery immediately
• The battery and charger should be placed on fire-retardant surface while charging is in
progress. If you are charging the battery while it is still mounted on the bike, make sure
that the bike is parked on an incombustible surface.
• Do not charge the battery while it is on a carpeted floor.
• Do not cover the battery or the charger while charging is in progress.
E
n
g
li
s
h

20
Notes for Battery Charger
The charger provided is suitable for voltage ranging from 100V to 240V. The charger does
not have to be switched to the associated voltage range, as it detects the voltage
automatically. There is no on/off switch on the charger. Make sure to unplug for energy
saving if no charging is required.
Connect the Charger
Connect the battery charger as illustrated. Connect the charger to the battery and the
shining red indicator light on the charger indicates the charging is underway. It takes
approximately 5 hours to fully charge the battery. Once the battery is charged, the green
indicator light on the charger will light up. While the battery is being charged on the bike
and you wish to check how much it is charged, you may turn the system on and the
instrument will show the battery level. If you are done charging, disconnect the charger
from the battery before removing the power plug from power socket.
There is no on/off switch on the charger. Make sure to unplug for energy saving if no
chargin is required.
Do not pedal the bike while the battery is being charged, or there is a risk of damaging the
charging socket on the bike.
The battery can be charged onboard or independently.
Do not move or pedal the bike while the battery is being charged onboard.
1