Casio 5278, 5307 User Manual
MA1207-EA
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Operation Guide 5271/5278/5307
Your watch may differ somewhat from the one shown in the illustration. •
Before Using the Watch for the First Time
Depending on your watch model, there may be a spacer installed •
at the factory around the cr own. If your w atch ha s a spa cer, yo u
should remove the spacer before using the watch.
After removin g the s pacer, use the proced ures in “Crown •
Operations” and “To adjust the time setting” to set up the watch
for use.
Hour Hand
Minute Hand
Setting time
Crown
Second Hand
To adjust the time setting
When the second hand is at 12 o’clock, pull the Crown out.
Rotate the Crown to change the time setting.
Push the Crown back in.
Note
When changing the time, move the minute hand four or five minutes past your final
•
setting, and then back it up to the setting you want.
Crown Operations
Some water-resistant models (100 meters, 200 meters)
have a screw-i n crown . When you nee d to pe rform a crown
operation, rotate it towards you to unscrew it. Then pull the
crown o ut. Avo id appl ying un due for ce when pullin g. The watch
loses its water resistance while the crown is unscrewed. After
performing a crown operation, fully screw the crown back in.
If your watch has a rotary bezel...
You can rotate the bezel to align its ▼ mark w ith the
minute hand. T hen you will b e able to tell how mu ch
time has elapsed since aligning the ▼ mark.
Current
Specifications
Accuracy: ±20 seconds average per month
Other: Low battery alert
Power Supply: Solar panel and one rechargeable battery
Approximate battery operating time: 5 months
Spacer
Crown
Crown
Loosen
Start
Elapsed time
Solar Charging
A solar panel generates electrical power that charges a built-in (secondary) battery.
The ent ire fac e is a solar p anel, s o power is gen erated when th e face is expo sed to
light. Keep the watch exposed to light as much as possible.
Charging the Battery
When you are not weari ng the w atch, leave it where i t is exp osed
to light . For stable o peration , expose the w atch to at least a half
day of light per month.
When wea ring the watch , try to keep your clo thing fr om block ing
its face (solar panel) . Chargi ng efficiency i s reduce d signifi cantly
even if the face is blocked only partially.
Caution!
The case of the watch may become quite hot when charging. Guard against burn
•
injury after charging.
Avoid charging in the following locations, and anywhere else where the watch may
•
become very hot.
On the dashboard of an automobile parked in the sun −
Close to an incandescent light source or other sources of heat −
Locations exposed to direct sunlight for long periods −
Low Charge and Dead Battery Conditions
An alert operation is performed when the battery charge goes low.
Low Battery Alert
The second hand will jump in two-second increments to alert you when the charge
is low.
Charging Time
The times below are general guidelines for reference only.
Charging Time to Support Daily Use
Outdoor sunlight (50,000 lux) 8 minutes
Sunlight through a window (10,000 lux) 30 minutes
Daylight through a win dow on a n overcast day
(5,000 lux)
Indoor fluorescent lighting (500 lux) 8 hours
Charging Time to Recover from Dead Battery
Outdoor sunlight (50,000 lux) 3 hours 24 hours
Sunlight through a win dow
(10,000 lux)
Daylight through a win dow on
an overcast day (5,000 lux)
Indoor fl uorescent ligh ting
(500 lux)
Important!
The wat ch will contin ue to r un for about fi ve mont hs afte r a ful l charg e, even if it is
not exp osed to light. For st able op eration , howev er, exp ose it to ligh t as mu ch as
possible.
Note
Actual charging time depends on environmental conditions.
Over-charge Protection
Chargin g stops automa tically when a full c harge i s attai ned. Th is prot ects ag ainst
over-charging.
Regular Timekeeping Low Battery Alert
Low charge
Charged
2-second jump
Exposure Level (Brightness) Approximate Charging Time
48 minutes
Exposure Level
(Brightness)
Approxim ate Charging
Time to 1-second Hand
Movement
11 hours 88 hours
17 hours 140 hours
167 hours – – –
Approximate Time to
Full Charge
1
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