Module No. 3539

Viewing the Face in the Dark

The watch has a light that illuminates the face for viewing in the dark.

To illuminate the face manually

Press (B) to turn on illumination.

Illumination will turn off automatically if an alarm starts to sound.

3539_08_LT_Intro

Important!

Frequent use of illumination will run down the battery.

Note

Display illumination is disabled when any one of the conditions below exists.

Alarm, timer alert, or other beeper sounding

Time calibration reception in progress

To illuminate the face when Auto Light is enabled

If Auto Light is enabled, face illumination will turn on automatically whenever the watch is positioned at an angle of 40 degrees or more.

Light_a

Important!

Auto Light may not operate properly when the watch is at a horizontal angle of 15 degrees or greater from horizontal as shown in the illustration below.

Light_b

Auto Light may operate unintentionally and run down the battery if the watch is blocked from light by your sleeve.

Electro-static charge or magnetism can interfere with proper auto light operation. If this happens, try lowering your arm and then angle it towards your face again.

When moving the watch you may note a slight rattling sound. This is due to operation of the auto light switch, which determines the current orientation of the watch. It does not indicate malfunction.

Note

Auto Light is disabled when any one of the conditions below exists.

Alarm, timer alert, or other beeper sounding

Time calibration reception in progress

Configuring the Auto Light Setting

  1. Enter the Timekeeping Mode.

    2. Navigating Between Modes

  2. Hold down (B) for at least three seconds to toggle Auto Light between enabled and disabled.

    3. [LT] is displayed while Auto Light is enabled.

    3539_09_LT_Intro

Note

Auto Light is disabled while [CHG] is shown on the display.

Specifying the Illumination Duration

You can select either two seconds or four seconds as the illumination duration.

  1. Enter the Timekeeping Mode.

    2. Navigating Between Modes

  2. Hold down (A) for at least two seconds. Release the button when the name of the currently selected Home City appears on the display.

    3. 3539_fl_HT_SET_comon

  3. Press (C) 12 times to display [LIGHT].

    4. 3539_10_LT_Intro

  4. Press (D) to select an illumination duration.

    5. [2]: 2-second illumination

    [4]: 4-second illumination

    3539_11_LT_Intro

  5. Press (A) to exit the setting screen.

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