Cal. No. F990
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Use this page to access operating instructions for the F990 movement.
Dual time
Modes of the watch
Charging
Power generation
- Checking power generation amount (Light-Level Indicator)
- Indication of power generation amount in levels
Reception result
World time
- World time function
- Checking the time zone setting for the home time
- How to read indication of the world time setting
- Table of time zones and representative places
- Obtaining location information from satellite signals
- About obtaining location information
- Setting the time zone manually
Receiving time information
- Receiving time information
- Executing time reception
- Executing leap second reception
- About automatic time reception
Summer time
Chronograph
Alarm
Charging your watch
- For efficient charging
- When the watch reaches a low charge state (insufficient charge warning function)
- Charging time by environment
- Battery duration after charging it fully
- Power save function
Information on satellite signal reception
- For receiving the satellite signal smoothly
- Cautions regarding receiving the satellite signal
- When receiving the satellite signal
- Receiving signals indoors near a window
- Poor reception areas
Particular settings for satellite controlled watches
- Information on leap second setting
- Checking and adjusting the leap second setting manually
- Information on rollover number setting
- Checking and adjusting the rollover number setting manually