King-Meter JK-LCD User manual

KING-METER
USERS GUIDE
JK
-
LCD

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Content
1. Preface......................................................................1
2. Appearance and dimensions ........................................1
3. Product summary..................................................................2
4. Display content......................................................................3
5. Precautions......................................................................3
6. Installation............................................................................4
7. Operation..............................................................................4
7.1 Power on/off......................................................................4
7.2 Selecting speed mode (current/average/speed)........ 4
7.3Distance (Trip/ODO/Trip time)....................5
7.4 Toggle headlight...............................................................6
7.5 Push assistance 6km/h...................................................6
7.6 PAS Level..............................................................7
7.7 Battery capacity and power............................................7
7.8 Error code.................................................................8
8. Setting..............................................................................9
8.1 Wheel size.......................................................................9
8.2 Speed limit.....................................................................10
8.3 Backlight brightness....................................................10
8.4 Units..............................................................11
9. Wire sequence....................................................................12
10. About the product code.....................................................12
11. FAQ..................................................................13
12. Warranty and coverage......................................................13
13. Version..............................................................................14

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1. Preface
Dear User,
To ensure the best performance of your e-bike, please read
through the JK-LCD product introduction carefully before use.
This user manual covers: Hardware installation, set up and
normal operation. It will also help to limit any confusion and
assist in you to resolve any malfunctions.
2. Appearance and Dimensions
JK-LCD housing material
is made from PC plastic
with a working
temperature range: -20℃
to 60℃. This material
ensures good mechanical
performance of the
product.
Display Dimensions and
Installation (Unit：mm)

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The N3-button is connected to
the bottom of the JK-LCD via
a cable.
In the following introduction,
is “M”, is “UP”, is “DOWN” and is “P”.
3. Functions Summary
Functions:
◆ Battery indication
◆Speed indication (Real time, Max and Average);
◆Distance indication (Current trip and Total distance);
◆PAS level
◆Backlight
◆Headlight toggle
◆Push assistance [6km/h]
◆Power indicator
◆Error codes
◆Customisable parameters such as: Wheel diameter, Speed
limit, Backlight, Units

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4. Display Content
JK-LCD interface
5. Precautions
Take care when using the display and do not
connect/disconnect it with power on
Avoid striking or knocking the display
Do not remove the waterproof film attached to the
display as this may impair its waterproofing.
In the case of errors or malfunctions the display should
be returned to your local supplier for repairs/replacements.

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6. Installation
Fix the display and N3-button unit on the handlebar and
adjust to an appropriate visual angle. Ensuring the power is
off, match display connector with controller connector.
7. Operation
7.1 Power On/Off
Press and hold P for several seconds to toggle the power on
or off to both the display and controller. While the power is off,
the display will no longer consume power with a leakage
current is less than 1uA.
The bike will be shut down automatically if it is
left idle for 10 minutes.
7.2 Selecting Speed Mode (Current/Average/Max)
On turning on the display the default speed mode is
current speed. Pressing and holding M for 3 seconds will

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cycle through the other speed modes in the order of: current
speed→max speed→average speed.
Current speed Max speed Average speed
7.3 Distance (Trip/ODO/Trip Time)
On turning on the display the default distance mode is
Trip Distance. Pressing and holding M for 3 seconds will
cycle through the other distance modes in the order of: Trip
Distance→ODO→Trip Time
Reset either the Trip Distance or Time by pressing both
M + D
while it is displayed.
Trip（TRIP） （ODO） Trip Time（TIME）

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7.4 Toggle Headlight
Press and hold for short time to toggle on/off the
headlight.
Illustration
7.5 Push Assistance 6km/h
Press and hold D to enable the push assistance mode. The
motor will cause the bike to travel at 6km/h.
6km/h illustration

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7.6 PAS Level
Press U and D to alter the PAS level, changing the
output power of the motor. The range of PAS levels is 1-5.
Level 1 is being the lowest and level 5 the highest. The
default level is level 1.
Level 1 level 2 level 5
7.7 Battery Capacity and Power
When the battery is full, all five segments of the battery
will be illuminated. When the battery is critically low, the
battery will have no segments and will flash. The WATT bar
will progressively fill as the motor power usage increases.
Full capacity low capacity under voltage

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Power showing
7.8 Error code
When the system encounters an error, the display would
show the relevant error code. Only once the problem/s has
been resolved will the display return to normal functionality.
The e-Bike will cease functioning so long as an error code is
shown.
Error code showing
E
rror
code
meaning solutions
21
Abnormal Current
C
heck if the phase of motor is short
circuit
ing
22
Abnormal Throttle
C
heck
that
the throttle is not in it’s
active state
23
No-phase state
C
heck if the phase
wire
is normal
Check if the cable is firmly connected
with controllers

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24
Abnormal Hall
signal
C
ontrollers without hall
sensors
:
C
heck
that the phase wire is normal
Controller with hall sensors: check if the
hall
wire
is normal
25
Abnormal Brake
C
heck
that the brake is not being
applied
30
Abnormal
Communication
Check if the display and
controller are
connected properly
8.Setting
While powered on, press and hold U and D for 2
seconds to enter into the settings menu.
8.1 Wheel Size
The range of optional wheel sizes is: 16’, 18’, 20’, 22’,
24’, 26’, 700C and 28’. The default wheel size is 26 inches.
Pressing U and D to choose the wheel size and then press M
to confirm the wheel size and to enter into the next setting.
Wheel size interface

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8.2 Speed Limit
Using the Speed Limit setting the max speed at which
the motor will work to can be set. When the bike’s speed
increases past the max speed the controller will cut down the
output power of the motor to protect rider. The speed limit
range is from 12km/h to 40km/h. The default of speed limit is
25km/h. Pressing U and D to alter the value and then press
M to confirm to enter into next setting.
Speed limited interface
8.3 Backlight Brightness
The backlight is always on but is different depending on
whether or not:
A. the Headlight is on

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B. the Headlight is off
There are 3 options for brightness, level 1 being the
lowest and level 3 being the highest. The default value is
level 1. Pressing U and D will alter the brightness and
pressing M will confirm.
A. light is on B. light is off
8.4 Units
Press U or D to change the units from Mile and MPH into km
and km/h. Press M to save.

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9.Wire sequences
Terminals Make connector. Female Connector
Wire sequence of standard connectors
No. Wire Colours Function
1
R
ed
（
VCC
）
P
ower cable of display
2
B
lue
(K)
P
ower cable
of controller
3
B
lack
(GND)
GND
4
G
reen
(RX)
D
ata
In
5 Yellow(TX) Data Out
Remarks: Display may use waterproof connector; in this case
the wires cannot be seen.
10.About the Product code
The Product code is displayed in two rows.
Row 1: 500101201.

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5001 indicates the customer code,
012 indicates the item code of JK-LCD
01 indicates the version number for the current customer
Row 2: 2016-07-1301
2016-07 indicates the production date
1301 indicates the default software version of the display
11. FAQ
Q：Why can’t I turn on the display?
A：Please check if the display cable is well connected with the
controller.
Q：How do I deal with the error codes?
A：Contact your local e-bike dealer for maintenance.
12. Warranty and Coverage
1. Any fault with the product as a direct result of the quality
will be replaced.
2. Warranty period: 24 months from the delivery time of the
display from the factory.
The following circumstances are not covered by
the Warranty.
1. Opened case
2. Damaged connector
3. Scratched or damaged case after delivery
4. Scratched or damaged cables
5. Malfunctions or damage caused by force majeure or
natural disasters
6. outside the warranty period

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13. Version
This manual has been based on the general-purpose
software (version V1.0) by Tianjin KING-METER Electronic
Co., Ltd. Some versions of the LCD may appear and behave
slightly different depending on the hardware and software
versions.