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Charging your watch
This watch has a solar cell under the dial and stores the power
generated by the cell in its built-in rechargeable cell.
The cell is charged by exposing the dial to light such as direct
sunlight or fluorescent lamps.
For optimal performance, be sure to:
• Put the watch in a location where the dial is exposed to bright
light such as by the window even when it is not used.
• Expose its dial to direct sunlight for 5 or 6 hours at least every
week.
• Avoid leaving it in dark places for long periods of time.
CAUTION
• Do not charge the watch at a high temperature (about 60°C (140°F) or higher) as
doing so may cause movement malfunction.
• If the watch is obscured from light by long sleeves frequently, supplemental
charging may be needed to ensure continual operation.
• The watch stops charging automatically after finishing (overcharging prevention
function). The function prevents damage to performance of the watch and
rechargeable cell due to overcharging.
When the watch reaches a low charge state (insufficient charge warning
function)
When the power reserve becomes low, the second hand moves
once every two seconds. This is the insufficient charge warning
function. Be sure to fully charge your watch immediately as
outlined below.
• When the watch is sufficiently charged, the second hand will
move normally.
• If you do not charge the watch for 2 days or longer after the
insufficient charge warning movement has begun, the watch will be depleted of all
power and stop.
During the insufficient charge warning state
The time and date are indicated correctly. However, other functions of the watch
will not be available for use.
Charging time by environment
Below are the approximate charging times when exposing to light continuously.
Please use this table as a reference only.
Illuminance
Environment
To work for one
(lx)
Outdoors (sunny)
100,000
Outdoors
10,000
(cloudy)
20 cm (7-
7/8 inches)
away from a
3,000
fluorescent lamp
(30 W)
Interior lighting
500
• Exposing to direct sunlight is recommended to charge your watch. A fluorescent
lamp or interior lighting does not have sufficient illumination to charge the
rechargeable cell efficiently.
Duration without additional charging after charging the watch fully
About 6 months
Power save function
The hands stop automatically to save power when the watch has been kept in a dark
place for a certain period of time and it cannot generate power.
• The watch works normally even while saving power. However, signal reception is
not executed.
• The power save function is not activated when the position of the crown is
Canceling the power save function
The power save status ends and the hands return to normal indication as the watch
is operated or the dial is exposed to light and power generation starts.
Charging time (approx.)
To start working
normally when the
charged when the
day
cell is discharged
2 minutes
2.0 hours
12 minutes
2.0 hours
40 minutes
3.5 hours
4.0 hours
13 hours
Troubleshooting
Cannot receive time signals
Symptom
The second hand
does not point
"RX".
Reception result
indicated is "NO"
after reception.
Movement of a hand seems strange
Symptom
The second hand
moves once every
two seconds.
The second hand
does not move.
No hands move.
The hands start
quick movement
suddenly.
Time/calendar is abnormal.
Symptom
Time/calendar is
incorrect.
Time/calendar
becomes incorrect
soon after manual
To become fully
adjustment.
cell is discharged
Summer time
and the standard
40 hours
time do not switch
automatically.
50 hours
The standard time
is indicated though
it is summer time.
−
Summer time is
indicated though
it is not summer
−
time.
1
or
2
.
Remedies
Charge the watch previously if required.
Push the crown in to position
0
.
Check the current reference position of the hands of the
watch and correct it if needed.
Check the time zone setting.
Check areas where time signals are receivable.
Remove the watch and place it on a stable surface where
it can receive the signal better, such as next to a window
facing the signal station.
Remedies
Insufficient charge warning function is active. Power
reserve of the watch is nearly empty. Charge immediately.
0
Push the crown in to position
.
Charge the watch under direct sunlight until the second
hand moves normally.
The power save function is canceled. Wait until the
current time and calendar are displayed.
Remedies
Check the time zone setting.
Check the summer time (DST) setting.
Receive the signals to adjust the time and calendar.
Adjust the time and calendar manually.
Check and correct the reference position of the hands.
Check and correct the reference position of the hands.
Change the summer time setting to "SMT AU" or "STD
AU" and execute signal reception.
Execute signal reception in a place where it is summer
time.
Receive the time signal manually.
Change the summer time setting to "SMT MA".
Receive the time signal manually.
Change the summer time setting to "STD MA".
H864 Instruction manual
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