Casio PRG-60TJ Service Manual & Parts List page 8

To turn the auto light switch on and off
In the Timekeeping Mode, hold down B for about two seconds to toggle the
auto light switch on ( displayed) or off (
• If you are in the Timekeeping Mode when you press B , the watch will go
directly into the Barometer/Thermometer Mode. Keep B depressed until
the auto light switch turns on or off. After that, you can return to the
Timekeeping Mode by pressing D .
• The auto light switch on indicator ( ) is on the display in all modes while
the auto light switch is turned on.
• The auto light switch is always disabled, regardless of its on/off setting,
when any one of the following conditions exists.
While a direction measurement operation is being performed in the
Digital Compass Mode
While a bearing sensor calibration operation is being performed in the
Digital Compass Mode
While the Hand Setting Mode setting screen is on the display
• The backlight may not light right away if you raise the watch to your face
while a barometric pressure or altitude measurement operation is in
progress.
Questions & Answers
Question: What causes incorrect direction readings?
Answer:
• Incorrect bidirectional calibration. Perform bidirectional calibration.
• Nearby source of strong magnetism, such as a household appliance, a
large steel bridge, a steel beam, overhead wires, etc., or an attempt to
perform direction measurement on a train, boat, etc. Move away from large
metal objects and try again. Note that digital compass operation cannot be
performed inside a train, boat, etc.
Question: What causes different direction readings to produce different
results at the same location ?
Answer: Magnetism generated by nearby high-tension wires is interfering
with detection of terrestrial magnetism. Move away from the high-
tension wires and try again.
Question: Why am I having problems taking direction readings indoors ?
Answer: A TV, personal computer, speakers, or some other object is
interfering with terrestrial magnetism readings. Move away from
the object causing the interference or take the direction reading
outdoors. Indoor direction readings are particularly difficult inside
ferro-concrete structures. Remember that you will not be able to
take direction readings inside of trains, airplanes, etc.
Question: How does the altimeter work?
Answer: Generally, air pressure and temperature decrease as altitude
increases. This watch bases its altitude measurements on
International Standard Atmosphere (ISA) values stipulated by the
International Civil Aviation Organization (ICAO). These values
define relationships between altitude, air pressure, and
temperature.
Altitude Air Pressure
616 hPa
4000 m About 8 hPa per 100 m
3500 m
701 hPa
3000 m
About 9 hPa per 100 m
2500 m
795 hPa
2000 m
About 10 hPa per 100 m
1500 m
About 11 hPa per 100 m
899 hPa
1000 m
500 m
About 12 hPa per 100 m
1013 hPa
0 m
Source: International Civil Aviation Organization
• Note that the following conditions will prevent you from obtaining accurate
readings:
When air pressure changes because of changes in the weather
Extreme temperature changes
When the watch itself is subjected to strong impact
There are two standard methods of expressing altitude: Absolute altitude and
relative altitude. Absolute altitude expresses an absolute height above sea
level. Relative altitude expresses the difference between the height of two
different places.
Height of building 130 m
(Relative altitude)
not displayed).
Temperature
–11 ° C
–4.5 ° C
About 6.5 ° C
per 1000 m
2 ° C
8.5 ° C
15 ° C
Rooftop at an altitude of
230 m above sea level
(Altitude above sea
level)
Sea
— 6 —
Precautions Concerning Simultaneous Measurement of Altitude and
Temperature
Though you can perform altitude and temperature measurements at the same
time, you should remember that each of these measurements requires
different conditions for best results. With temperature measurement, it is best
to remove the watch from your wrist in order to eliminate the effects of body
heat. In the case of altitude measurement, on the other hand, it is better to
leave the watch on your wrist, because doing so keeps the watch at a
constant temperature, which contributes to more accurate altitude
measurements.
The following describes what you should do to give priority to either altitude or
temperature.
• To give altitude measurement priority, leave the watch on your wrist or in
any other location where the temperature of the watch is kept constant.
• To give temperature measurement priority, remove the watch from your
wrist and allow it to hang freely from your bag or in another location where
it is not exposed to direct sunlight. Note that removing the watch from your
wrist can momentarily affect pressure sensor readings.
Question: How does the barometer work?
Answer: Barometric pressure indicates changes in the atmosphere, and by
monitoring these changes you can predict the weather with
reasonable accuracy. Rising atmospheric pressure indicates good
weather, while falling pressure indicates deteriorating weather
conditions.
The barometric pressures that you see in the newspaper and on
the TV weather report are measurements corrected to values
measured at 0 m sea level.
Battery
This watch is equipped with a solar cell and a
Solar cell
rechargeable battery (secondary battery) that is
charged by the electrical power produced by the
solar cell. The illustration shown nearby shows
how you should position the watch for charging.
Example: Orient the watch so its face is pointing
at a light source.
• Note that charging efficiency
drops when any part of the solar
cell is blocked by clothing, etc.
• The illustration shows how to
position a watch with a resin band.
Important!
• Storing the watch for long periods in an area where there is no light or
wearing it in such a way that it is blocked from exposure to light can cause
rechargeable battery power to run down. Be sure that the watch is normally
exposed to bright light whenever possible.
• This watch employs a solar cell that converts light into electricity, which
charges a built-in rechargeable battery. Normally, the rechargeable battery
should not need replacement, but after very long use over a number of
years, the rechargeable battery may lose its ability to achieve a full charge.
If you experience problems getting the rechargeable battery to a full charge,
contact your dealer or CASIO distributor about having the rechargeable
battery replaced.
• The rechargeable battery should be replaced with a CASIO-specified
CTL1616 battery only. Other rechargeable batteries can cause damage to
the watch.
• All data stored in memory is deleted, and the current time and all other
settings return to their initial factory defaults whenever battery power drops
to Level 4 and when you have the battery replaced.
• Turn on the watch's Power Saving function and keep it in an area normally
exposed to bright light when storing it for long periods. This helps to keep
the rechargeable battery from going dead.
Battery Power Indicator
The battery power indicator on the display shows you the current status of the
rechargeable battery's power.
Level Battery Power
Indicator
1
2
3
Battery power
indicator
(Charge Soon Alert)
4
Function Status
All functions enabled.
All functions enabled.
Except for timekeeping and
battery power indicator, all
functions and display indicators
are disabled.
All functions disabled.