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Problem Possible Cause Corrective Action Reference
Slow in
switching
modes
“CHK” remains
displayed for a
long period of
time
“FILE” remains
displayed
“ERR” remains
displayed for a
long period of
time
• “ERR” is
displayed when
using the watch
on land (excluding
high altitudes at
3,000 m (10,000 ft)
or more above
sea level)
• “ERR” continues
to be displayed
for a long period
of time after
completion of
diving
There is an error in the
pressure sensor. (“ERR” may
be displayed at high-altitude
locations of 3,000 m (10,000
ft) or more above sea level.)
As more and more flash
memory is used, slightly more
time may be required for the
watch to switch modes and
call up log data.
After rinsing off any debris
around the water sensor with
water, carefully wipe off any
excess moisture with a dry
cloth.
The water sensor continues
to be activated due to the
presence of sand, debris,
perspiration or other matter
on the water sensor.
The amount of available
space in flash memory is low.
The watch is insufficiently
charged and the ambient
temperature is low.
* The file error warning may be
activated if the ambient
temperature becomes low while
the watch is insufficiently
charged.
Flash memory error. Format the flash memory in the
system monitor mode of the
standard mode. If the problem
is still not solved, consult the
Citizen Service Center.
Perform the garbage collection
procedure in the system
monitor mode of the standard
mode
Sufficiently charge the watch by
installing on the charger or
communication unit.
Perform the garbage collection
procedure in the system
monitor mode of the standard
mode. When a large number of
diving logs are stored in the
watch, although slightly more
time may be required to call up
the display, this is not a
malfunction.
“Using the
Standard Mode: 7.
Using the System
Monitor Mode”
“Warning
Functions”
“Warning
Functions”
“Using the
Standard Mode: 7.
Using the System
Monitor Mode”
“Warning
Functions”
“Charger: 3.
Charging the
Watch”
“Warning
Functions”
“Formatting Flash
Memory”
“Warning
Functions”
Discontinue using the watch
and consult the Citizen Service
Center.