Sunding Bicycle Computer SD-548C User Manual

Sunding Bicycle Computer

SD-548C (14Functions)

FUNCTIONS

- SPD CURRENT SPEED

- ODO ODOMETER （0.001～99999km/m)

- DST TRIP DISTANCE

- MXS MAXIMUM SPEED

- AVS AVERAGE SPEED

- TM ELAPSED TIME .

- CLK CLOCK （12H/24H）

- SCAN

- “+” “－” COMPARATOR

- SETTING SPEED SCALE（km/h,m/h）

- SETTING TYRE CIRCUMFERENCE :（ 0mm ～

9999mm）

- SETTING THE LAST VALUE OF

ODOMETER/ODO

- FREEZE FRAME MEMORY

- AUTO ON/OFF

Computer Battery Installation

Remove the battery cover from the bottom of the computer
by using a flat blade screwdriver, install one CR2032
battery with the positive (+) pole facing the battery cover
and replace the cover. Should the LCD show irregular
figures, take out the battery and reinstall it.

Sensor Transmitter Battery Installation

Remove the battery cover
from the bottom of the
computer by using a flat blade
screwdriver, install one 23A
12V battery with the positive
(+) pole facing the battery
cover and replace the cover.
Should the LCD show
irregular figures, take out the battery and re-install it.

Sensor Transmitter

Attach the sensor transmitter to the left fork blade, the
distance between computer and the sensor can not exceed
60cm, the closer the batter. Using the shims to adjust the
diameter, and using the cable
ties(show below) to tie it with the
fork. Position the sensor
transmitter and magnet as shows,
make sure that the arc of the

magnet intersects the alignment mark on the sensor
transmitter with 1.5mm clearance.

Mounting Shoe

Attach the mounting shoe with the cable ties to the
handlebar, adjust the mounting shoe on the handlebar with

the shims to hold its position

.

Computer

Attach the computer to the mounting shoe by sliding the
unit until it snaps firmly into its postion. To remove it, press
the button on it in the opposite direction.
To check for proper speed function and sensor alignment,
spin the front wheel with computer in speed mode. Adjust
the position of sensor and magnet when there is no or weak
reaction.

Wheel Size Input

‘2060’ appears on the screen when the battery has been
installed, with one figure flashing,choose the correct wheel
circumference from the table below.Press RIGHT button to
advance digits as needed and LEFT button to confirm and
advance. (The circumference ranges 0mm～9999mm), press
LEFT button to enter KM/M mode.

TIRE SIZE

700c x 38mm 2180 26’’ x 2.25’’ 2115
700c x 35mm 2168 26’’ x 2.1’’ 2095
700c x 32mm 2155 26’’ x 2.0’’ 2074
700c x 30mm 2145 26’’ x 1.9’’/1.95’’ 2055
700c x 28mm 2136 26’’ x 1.75’’ 2035
700c x 25mm 2124 26’’ x 1.5’’ 1985
700c x 23mm 2105 26’’ x 1.25’’ 1953
700c x 20mm 2074 26’’ x 1.0’’ 1913
700cTubulari 2130 24’’ x 1.9’’/1.95’’ 1916
650c x 23mm 1990 20’’ x 1-1/4’’ 1618
650c x 20mm 1945 16’’ x 2.0’’ 1253
27’’ x 1-1/4’’ 2161 16’’ x 1.95’’ 1257
27’’ x 1-1/8’’ 2155 16’’ x 1.5’’ 1206
26’’ x 2.3’’ 2135

CIRC

TIRE SIZE

Setting（（（（km/h））））/（（（（m/h））））

Press the RIGHT button to choose km/h or
m/h. Press the LEFT button to enter
CLOCK mode.

CLK Mode(12H/24H)

In CLOCK Mode, press the LEFT button
for 3 seconds to enter 12/24H selection.
Re-press the LEFT button for 12/24
exchanging. Press the RIGHT button to
enter Hour setting mode, when the figure
indicating HOUR start to flash, press the LEFT button to
adjust it.
Continue to press the RIGHT button to enter Minute setting
mode, when the figure indicating MINUTE start to flash,
press the LEFT button to adjust it and RIGHT button to
confirm, press the RIGHT button again to ODO mode.

Setting the Last value of
Odometer

In ODO mode, press the LEFT button
for 2 seconds to set the ODO value,
its initial value is 0000.0. when one
figure flashing, press RIGHT button to adjust it and
LEFT button to confirm it and start to set the next

CIRC

figure.(after re-install the battery, latest value can
be inputted according to the value exists before the
battery is re-installed).

Reset of Mileage Parameter

In ODO mode, press and hold both RIGHT and LEFT
button simultaneously for 3 seconds to clear the tire
circuference and (km/m) setting, The user need to reset the
tire circumference and (km/m), the original ODO value and
CLOCK will remain unaffected.

Speedometer

Speed is shown all the time on the screen, its maximum
reading is 99.9km/h(m/h), and it’s accurate to +/- 0.1km/h
(m/h).

Speed Comparator

During riding , ‘+’and ‘-’ indicates the current speed is
higher or lower than average speed(AVS) .

Odometer

In ODO mode , the total distance is
indicated on the screen, its mileage
range is 0.001 ～ 99999km(m). the
display will be back to 0 when value
exceeds its maximum limit, press the RIGHT button to enter
DST mode..

Trip Distance (DST)

In DST mode, the distance for one trip
is indicated on the bottom line. DST
ranges from 0.001～9999km(m), when
the value exceed the range limit, it
restarts from 0 automatically. Both the time and the
distance records will be cleared when the time of one trip
exceed the range limits.
press the LEFT button for 5 seconds to clear the records of

DST,MXS,AVS and TM.

Press the RIGHT button to enter MXS mode.

Maximum Speed (MXS)

In MXS mode, maximum speed is
indicated on the bottom line. Press the
LEFT button for 5 seconds to clear the
records of MXS,DST,AVS and TM.
Press the RIGHT button to enter AVS mode.

Average Speed

In AVS mode, average speed is
indicated on the bottom line. Press the
LEFT button for 5 seconds to clear the
records of AVS,DST,MXS and TM.
Press RIGHT button to enter TM mode.

Trip Time

In TM mode, trip time is indicated on
the bottom line.TM ranges 0 :00 :00～
99 :59 :59. It will be back to 0 when
value exceed the limits.
Press the LEFT button for 5 seconds to clear the records of
TM, DST,MXS and AVS.
Press the RIGHT button to enter SCAN mode.

SCAN

In Scan mode , DST, MXS, AVS and TM mode are
indicated in turn every 4 seconds.
Press the RIGHT button to enter CLOCK Mode.

Sleep Mode

If no signal has been inputted for 300 seconds, computer
will enter into Sleep Mode, and CLK value remains. It will
turn back to the former mode with all the data collected
when any signal is inputted or any button is pressed.

FREEZE FRAME MEMORY

Press the LEFT button in any time will enter into freeze
frame memory mode. Flashing TM data will appear on the
screen. Press the RIGHT button to view the records of DST,
MXS, AVS and TM.
Press the LEFT button to end it.

Buttons Instruction

Press the RIGHT button to choose any mode below :
ODO, DST, MXS, AVS, TM, SCAN（DST、MXS、AVS、
TM） and CLOCK. It’s unnecessary to press the LEFT
button except choosing the Freeze frame Memory mode.
In Freeze Frame Momery mode, press the RIGHT button,
several data will display, re-press LEFT button to turn back
to other modes.

Malfunctions and Problems

Malfunctions Problems

No speedometer

Short distance of
the transmitter or
no receiving
Display Abnormal
figures
Inaccurate value is
indicated
Slow d isplay
response

Black display

Weak display Poor battery contact or dead battery
Display shows
irregular figures

Sensor without
reaction

Accessories

Improper magnet/sensor alignment
Distance between computer and
sensor transmitter exceed 60cm
Low battery voltage of sensor
transmitter or computer.
Lower battery voltage, need to
change for a new one.

Too much Electromagnetic
interference around
Improper input, such as wheel
circumference.
Temperature exceeds operating
limits(0℃～55℃).
Temperature too high, or put in
direct sunlight for too long time.
Need take back to shadow place for
a period.

Take out battery and re-install it
after 10 seconds.

Put off the insulation film of the
sensor transmitter