11
10
If the second hand of the watch is moving in 2-second interval movement or has stopped
due to undercharging, recharge the watch either by exposing the solar cell to light or by
swinging.
A. Charging by Exposing the Solar Cell to Light
* Expose the surface of the solar cell to a fluorescent lamp, incandescent light or sunlight
to recharge.
* If the watch is ordinarily concealed from the light as a result of wearing long sleeve
shirts and so on, the watch will be susceptible to becoming undercharged as a result of
not being exposed to light. Try to place the watch in as bright a location as possible
when it is not worn.
* When there are few opportunities for exposing the watch to light, the watch can also be
recharged by swinging in the manner described below.
[Precautions When Charging by Exposing to Light]
* Avoid charging the watch at high temperatures (approx. 60
°
C/140
°
F and above) since
allowing the watch to become overheated during charging can lead to a malfunction.
6. Charging Procedure
5. General Reference for Charging Times
(Case of Charging by Illuminating Solar Cell Only)
Charging times differ depending on the watch model (type of face, etc.). The charging
times shown in the table below are meant to only serve as a rough indicator of required
charging times.
*The charging
time indicated
refers to the
duration of
continuous
illumination.
Luminance
(Lux)
Environment
Charging time
Charging
time for 1 day
of operation
Charging time from
stop until 1-second
interval movement
Full
charging
time
Typical office
Under a fluorescent
lamp (30 W) at a
distance of 60-70 cm
(24-28in.)
Under a fluorescent lamp
(30 W) at a distance of
20 cm(8 in.)
Cloudy day
Under direct sunlight
on a summer day
2 hours
45 minutes
15 minutes
4 minutes
2 minutes
37 hours, 30 minutes
15 hours
5 hours
1 hour, 30 minutes
30 minutes
335 hours
143 hours
45 hours
13 hours
2 hours, 30
minutes
Full charging time: Time from the state in which the watch is stopped until it is fully charged
Charging time for 1 day of operation: Time required for the watch to run for 1 day using the
normal time display (1-second interval movement)
500
1,000
3,000
10,000
100,000
Summary of Contents for B51
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