Manual Citizen Cal F910 (page 2 of 12) (English)

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1. Main Features

This watch is an analog quartz watch equipped with a thermoelectric generation

function that drives the watch by converting body heat (heat energy), produced

when wearing the watch on the wrist, into electrical energy.

Power is generated when the watch is worn on the wrist and the second hand is

moving at 1-second intervals. When the watch is removed from the wrist, the

second hand moves at 10-second intervals, indicating that power is not being

generated.

When fully charged, the watch will run continuously for about six months without

charging. To fully charge the watch after it has stopped due to insufficient charge

requires about 15 days (continuous charging). To ensure optimal usefulness,

make sure that the watch is always sufficiently charged.

This watch uses a secondary battery for storing the electrical energy that is

generated. This secondary battery is completely free of mercury or other haz-

ardous substances. It does not have to be replaced periodically in the manner of

conventional watch batteries since it is able to be charged and discharged re-

peatedly.

CONTENTS

1. Main Features................................................................................. 3

2. For Proper Power Generation......................................................... 4

•Power Generation Mechanism

• Distinguishing Between Power Generating and Non-Power

Generating Modes

•General Reference for Charging Times

• Hints for Effective Power Generation

• Precautions During Power Generation

• Don’t Open the Back Cover of the Watch Unnecessarily

3. Setting the Time and Calendar ....................................................... 8

• Setting the Time

• Setting the Calendar

4. Characteristic Functions ................................................................ 12

5. Warning Functions ........................................................................ 14

• Insufficient Recharging Warning Function

• Time Setting Warning Function

6. Secondary Battery ......................................................................... 16

• Handling of the Secondary Battery

• Only Use the Specified Battery

• When Not Using for a Long Period of Time

7. Precautions ................................................................................... 17

8. Specifications ................................................................................ 23

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Citizen Cal F910 Manual

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