Seiko C-21 - Setting the Time, Date and Day by Receiving a Radio Signal; Mechanism of Radio Signal Reception; Automatic Reception and Manual Reception; Reception Environment

2
Checking the time, date and day
* The hands of this watch cannot be moved by turning the crown.
* So when adjusting the time, date and day, refer to the following regarding the procedures.
When the time, date
and day are correct
Use the watch without
adjustment.
When ether
time, date or
day is incorrect
Time zone
confirmation
→ P.31
When the radio
signal can be
received
Setting the time, date
and day by receiving a
radio signal → P.70
Radio signal reception range indication → P.
19
Environments in which it is difficult to receive a radio signal → P.
25
When a radio
signal cannot
be received
Manually set the time
→ P.73
Manually set the date
→ P.75
Manually set the date and day
→ P.78
* When the watch is not displaying the precise time, date and day even after successfully receiving a radio signal →
In this case, refer to Troubleshooting: Misalignment of the time and hands P.90 and Misalignment of the date and
day P.92.
EN
16
2
BEFORE USE
Setting the time, date and day by receiving a radio signal
■ Mechanism of radio signal reception
The radio-controlled watch displays the precise time, date and day by automatically receiving and
synchronizing itself with the radio signal of an official standard frequency.
Transmitting
Station
Cesium
Atomic
Clock
Official standard
frequency
Radio-controlled watch
Receive radio signals through
the antenna inside the watch
Analyze time information
Display the current time, date
and day
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.
EN
17
3
HOW TO SET THE TIME (RADIO SIGNAL RECEPTION)
■ Automatic reception and manual reception
●
Automatic reception
This watch sets the time, date and day 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.
• 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.24
●
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.70
* Radio signal reception results depend on the receiving environment. “Environments in which it is difficult to receive
a radio signal” → P.25
* The watch cannot receive a radio signal outside the radio signal reception range. “Radio signal reception range
indication” → P.19
* 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.33
* When the watch is not displaying the precise time, date and day even after successfully receiving a radio signal.
In this case, refer to “Troubleshooting: Misalignment of the time and hands” → P.90 and “Misalignment of the date
and day” → P.92.
EN
18
3
HOW TO SET THE TIME (RADIO SIGNAL RECEPTION)
Reception environment
■ Radio signal reception range indication
This watch receives standard radio signals from Japan (2 stations), China, U.S.A., Germany and UK.
When you set the watch to a time zone in Japan, China, U.S.A., Germany or UK, the official standard
frequencies the watch receives will be automatically changed accordingly to the selected time zone.
“How to select the time zone (How to display the local time around the world)” → P.31
Germany (DCF77), UK (MSF)
P.23
China (BPC)
P.21
Japan (JJY)
P.20
U.S.A.
(WWVB)
P.22
EN
19
3
HOW TO SET THE TIME (RADIO SIGNAL RECEPTION)