Before Use; Setting The Time And Date By Receiving A Radio Signal; Mechanism Of Radio Signal Reception; Automatic Reception And Manual Reception - Seiko C-20 Instructions Manual

Before Use

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Checking the Charging Status
When the movement of the seconds hand shows an energy depletion state, the battery requires
charging.
The seconds hand moves The watch is
at one-second intervals. sufficiently charged.
The seconds hand moves
at two-second intervals.
The charged energy is depleted.
The seconds hand moves
at five-second intervals.
The power save function is activated. → P.51
Check the movements of the seconds hand
The seconds after releasing the Power Save mode.
hand is stopped.
The energy stored in the watch runs low.
* If the seconds hand does not move at one-second intervals even after fully charging the battery, refer to
"Charging the solar battery" in Troubleshooting on P.98
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Setting the time and date by receiving a radio signal

■ Mechanism of radio signal reception

The radio-controlled watch displays the precise Time and Date by automatically receiving and
3 synchronizing itself with the radio signal of an official standard frequency.
Transmitting
Station
Official standard
Cesium
Atomic
Clock
Time signal transmitted by a standard frequency is based on a super accurate "Cesium Atomic Clock" that
may have a 1 second loss or gain per one hundred thousand years.
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→ P.50
Charge the
battery
sufficiently.
How to charge
the battery
→ P.48
Radio-controlled watch
Receive radio signals through
the antenna inside the watch
frequency
Analyze time information
Display the current Time and
Date
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Checking the time and date
* The hands of this watch cannot be moved by turning the crown.
* When adjusting the time or date, refer to the following regarding the procedures.
When the time and Use the watch without
date are correct adjustment.
When the time Time zone
and date are confirmation
incorrect → P.32
* When the watch does not display the correct time and date even after successfully receiving a radio signal, refer
to Troubleshooting.→ Misalignment of the time and hand positions P.98, and Misalignment of the date P.100

■ Automatic reception and manual reception

● Automatic reception
This watch sets the time and date by automatically receiving a radio signal at a fixed time.
It automatically receives a radio signal before 2:00 AM, 3:00 AM and 4:00 AM.
* When the reception is successful, the watch finishes the automatic reception.
* If the stopwatch hands are not reset to the 0-position, the watch will not receive a radio signal to set the time.
Make sure that the stopwatch hands are reset to the 0-position. "How to Reset the Stopwatch" → P.40
• Place the watch in a place where it can easily receive a radio signal (by the window, etc.).
• Do not move the watch during the radio signal reception.
"To improve radio signal reception" → P.25
● Manual reception
This watch can receive a radio signal arbitrarily at any time other than the automatic reception mode.
"How to conduct manual reception" → P.78
* Radio signal reception results depend on the receiving environment. "Environments in which it is difficult to receive
a radio signal" → P.26
* The watch cannot receive a radio signal outside the radio signal reception range. "Radio signal reception range
indication" → P.20
* When the time zone is set for a region other than the radio signal reception range, radio signals cannot be received.
Check the selection of time zone. "Time zone display and time difference table" → P.34
* When the watch does not display the correct time and date even after successfully receiving a radio signal, refer to
Troubleshooting. "Misalignment of the time and hand positions" → P.98, "Misalignment of the date" → P.100
When the radio Setting the time and date
signal can be by receiving a radio
received signal → P.78
Radio signal reception range indication → P.20
Environments in which it is difficult to receive a radio signal → P.26
Manually set the time
When a radio
→ P.82
signal cannot
Manually set the date
be received
→ P.84
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