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TopPage>Knowledge of watches/clocks>Q&A regarding radio-controlled watches/clocks>Q3 Why does my radio-controlled watch/clock gain or lose time?

Q&A regarding radio-controlled watches/clocks
Q1 How does a radio-controlled watch/clock work?
Q2 In what environment does my radio-controlled watch/clock receive standard electric wave?
Q3 Why does my radio-controlled watch/clock gain or lose time?
Q4 Is my radio-controlled watch/clock affected by magnetism?
Q5 How long does it take for my radio-controlled watch/clock to complete radio wave reception?
Q6 Does my radio-controlled watch/clock have influence on the human body or medical equipment?
Q7 My radio-controlled watch/clock has suddenly stopped receiving radio waves. Why?
Q8 Why don't radio-controlled clocks with analogue displays have any setting stem?
Q9 What are appropriate measures to be taken when my radio-controlled clock cannot display the correct time or a malfunction is observed immediately after battery replacement?

Q3 Why does my radio-controlled watch/clock gain or lose time?

Most symptoms can be explained in the four cases listed below.

1. My radio-controlled watch/clock is slightly before or ahead of the time signal.

Less than one second may be gained or lost because of the arithmetic processing right after radio wave reception. Since time is corrected every day, gains/losses will not be accumulated.

2. My radio-controlled watch/clock is off by several seconds.

(1) Automatic reception has not been successfully performed.
Check the reception result display to see whether automatic reception has been successfully performed.
If the reception was not successful, conduct manual reception in a good reception environment.
(2) Hand alignments are not correct (applicable only to analogue watches/clocks).
Hand positions might have been deviated by magnetic influence. If hand positions are misaligned, check the instruction manual to correct the preliminary hand positions. Then conduct manual reception in a good reception environment. When using a radio-controlled watch/clock, try keeping it away from strong magnetic fields. If hand alignments are not corrected even after conducting manual reception, the problem may be caused by other factors. Send your watch for repair.

3. My radio-controlled watch/clock displays completely incorrect time.

Radio wave reception might have been interfered by radio noise, etc. Make sure that your radio-controlled watch/clock is kept away from any source of interference, such as air conditioners, televisions or personal computers, and conduct manual reception in a good reception environment.

4. My radio-controlled watch/clock is off by one or more hours.

The time difference adjustment function or other functions may be activated. After disabling the time difference adjustment function, Daylight Saving Time setting function and world time function, conduct manual reception in a good reception environment, and then set the time correctly.

For these procedures, refer to the instruction manual of your radio-controlled watch/clock.

(Note): The above information applies to members of the Japan Clock & Watch Association and their products.
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