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Trouble Check Items Remedy
Cannot measure the cur-
rent speed or cadence
Is the battery for the speed
sensor empty?
Replace it with a new battery (CR2032).
Did you perform the format-
ting operation?
The sensor ID was deleted by formatting. Syn-
chronize the speed sensor ID again (page 52).
Measure the current speed,
but cannot measure the
cadence.
Is the connection on the
cadence side of the speed
sensor dirty?
The continuity on the cadence side of the speed
sensor is bad.
Loosen the set screw on the cadence side to
remove the cadence sensor. Clean the pins with
a dry cloth and replace the sensor. After clean-
ing, adjust the distance to the magnet, and then
firmly secure the sensor.
Heart rate signals are not
received.
Is the Heart rate sensor icon
on
?
If icon is off, the wristwatch cannot receive
any data. Press the MODE1 or MODE2 button
to cancel the transmission sleep (page 22).
Has the power-saving
mode been activated,
entering Clock mode?
Press the MENU button to switch to Sports mode.
Is the heart rate sensor attached
securely to your body?
Adjust the electrode pad with its rubber surface
to have a good contact with the body.
Dry skin (particularly in
winter)
Slightly moisten the electrode pad of the heart
rate sensor.
Is the battery for the heart
rate sensor used up?
Replace it with a new battery (CR2032).
Check whether lights up
on the wristwatch screen.
The remaining battery capacity of the wrist-
watch is low. Replace it with a new battery
(CR2430). After replacement, be sure to per-
form the restarting operation (page 13).
Is the electrode pad overly worn
and damaged after long use?
Replace it with a new heart rate sensor.
Did you perform the format-
ting operation?
The sensor ID was deleted by formatting.
Synchronize the heart rate sensor ID again
(page 52).
Fluctuation in the heart rate
indicator, for example it re-
turns to zero and then the
heart rate is measured again.
Is the electrode pad being
worn correctly?
To wear the electrode pad correctly, follow the
instructions for wearing the heart rate sensor
(page 12).
Moving the main unit away
from your body will pre-
vent measurement of the
heart rate.
Check whether lights up
on the wristwatch screen.
The remaining battery capacity of the wrist-
watch is low. Replace it with a new battery
(CR2430). After replacement, be sure to per-
form the restarting operation (page 13).
Is the battery for the heart
rate sensor used up?
Replace it with a new battery (CR2032).
Some values in the Data
mode “Past records” have
been reset.
Did you change any date in
the past according to “Set-
ting the clock/date”?
Some values for the year, month, or week are
deleted according to the relevant changes. For
details, see page 47.