Filter
Top Products
2172-8
BACKLIGHT
The backlight uses an EL (electro-
luminescent) panel that causes the entire
display to glow for easy reading in the dark.
The watch’s auto light switch automatically
turns on the backlight when you angle the
watch towards your face.
• The auto light switch must be turned on
(indicated by the auto light switch on
indicator) for it to operate.
• See “Backlight Precautions” for other
important information about using the
backlight.
Turning on the Backlight Manually
In the Timekeeping, Alarm, or Diving Mode, press B to illuminate the display.
• The above operation turns on the backlight regardless of the current auto
light switch setting.
About the Auto Light Switch
Turning on the auto light switch causes the backlight to turn on whenever you
position your wrist as described below in any mode.
• Be sure to wear the watch on the outside of your left wrist while using the
auto light switch.
Moving the watch to a position that is parallel to the ground and then
tilting it towards you more than 40 degrees causes the backlight to turn
on.
5
630
20 00
0
05
1
Auto light switch on indicator
Parallel to
ground
More
than
40°
Warning!
• Frequent use of the backlight while submerged can run down battery
power to the point that dive data measurement is disabled and proper
dive data storage becomes impossible. Take care that you do not
over use the backlight and that you turn off the auto light switch
whenever you are not using it.
• Always make sure you are in a safe place whenever you are reading
the display of the watch using the auto light switch. Be especially
careful when running, riding a bicycle or motor cycle, driving a car, or
engaged in any other activity that can result in accident or injury.
Also take care that sudden illumination by the auto light switch does
not surprise or distract others around you.
To turn the auto light switch on and off
In the Timekeeping or Diving Mode, hold down D for one second to turn the
auto light switch on (
displayed) and off ( not displayed).
• The auto light switch on indicator (
) is on the display in all modes
while the auto light switch is turned on.
• In order to protect against running down the battery, the auto light switch is
automatically turned off approximately six hours after you turn it on.
WEAK BATTERY POWER
This watch is equipped with flash memory (EEPROM) that is designed to
retain its contents even when the battery goes dead. However, any of the
following conditions can cause corruption or even loss of memory contents.
• Taking the watch apart
• Malfunction or repair of the watch
• Subjecting the watch strong electrostatic charge or impact
• Exposing the watch to temperature extremes (especially extreme cold)
• Improper battery replacement
Low Battery Warning
When battery power drops below a certain
level, a BATT indicator appears on the display
and the following functions become disabled.
• Alarm and Hourly Time Signal
• Backlight
• Sensor operation
• Log data recall
• Diving Mode
In addition, timekeeping may become
inaccurate and the watch’s display may fail
entirely.
Even when battery power is not low, keeping the backlight on too long or
recalling log data for an extended period can cause the RECOVER indicator
to flash on the display. This message appears to let you know that the
operation you are performing is overloading the battery. If you continue with
the high-load operation, the RECOVER indicator will remain on the display
(without flashing) and the following functions will become temporarily
disabled.
• Alarm and Hourly Time Signal
• Backlight
• Sensor operation
• Log data recall
• Diving Mode
The RECOVER indicator will disappear from the display and the above
operations will be re-enabled after the battery recovers to normal levels.
5
630
20 00
0
05
1
Important!
• In order to avoid possible problems due to a weak battery, we
suggest that you have it replaced (regardless of the low battery
message status) whenever you plan to engage in intensive diving.
• Extensive use of the backlight (more than 50 operations per hour) in the
Diving Mode will cause the RECOVER indicator to flash. Continued
extensive backlight use (more than 20 operations) will cause the
RECOVER indicator to remain on the display without flashing. Memory
data is lost, and dive measurements and backlight operation are disabled
at this time. Because of this, you should stop using the backlight and
terminate your dive as soon as possible after the RECOVER indicator
starts to flash while you are diving.
• Extensive backlight use also runs down the battery. About 50 operations in
one hour in the Diving Mode reduce battery life by about one week.
• Operating the backlight at low temperatures (around 0°C/32°F) can cause
the low battery message to appear, but the message will disappear when
normal temperature is attained. Avoid using the backlight as much as
possible at temperatures outside the guaranteed operating temperature
range (0°C/32°F to 40°C/104°F).
• Be sure to have the battery replaced at least once every two years.
Frequent use of the backlight can cause backlight operation to become
disabled. Have the battery replaced as soon as possible when this
happens.
• If you dive extensively (more than 100 dives per year), you should have
your watch serviced every 100 dives.
• The original battery installed in the watch at the factory loses some
capacity during the time it spends in shipment and on the shelf. Because of
this, the original battery may no provide the normal service life indicated by
the specifications.
Battery replacement should be performed by an authorized CASIO
Service Point only. When replacing battery, the Authorized CASIO
Service Point will also perform a full overhaul, replacing the sealing
material that is vital to the water resistance of your watch. Be sure to
request such servicing through an Authorized CASIO Dealer/Distributor.