Module No. 5660

Viewing the Face in the Dark

The face of the watch can be illuminated for viewing in the dark.

To illuminate the face manually

Pressing (L) turns on illumination.

Illumination turns off automatically if an alarm starts to sound or if you perform a crown operation.

Illumination does not turn on while a signal receive operation or a hand movement operation is in progress. Also, illumination may not turn on while a sensor is taking a reading.

5660_21_LT_Intro

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

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

Hand movement operation is in progress

Watch in the Compass Mode

While a time signal receive operation is in progress

Configuring the Auto Light Setting

You can enable or disable Auto Light as required.

  1. Enter the Timekeeping Mode.

    2. Navigating Between Modes

  2. Pull out the crown.

    3. This causes [CITY] to flash on the display and the second hand to move to the current Home City.

    5660_HT_SET_comon

  3. Press (B) three times.

    4. [dot_LT_AUTO] appears on the display with [ON] or [OFF] flashing.

    5660_22_LT_Intro

  4. Rotate the crown to enable or disable the Auto Light.

  5. Push the crown back in to complete the setting operation.

Note

If you do not perform any operation for about two minutes after pulling out the crown, crown operations will automatically become disabled. If that happens, push the crown back in and then pull it out again.

Specifying the Illumination Duration

You can select either 1.5 seconds or three seconds as the illumination duration.

  1. Enter the Timekeeping Mode.

    2. Navigating Between Modes

  2. Pull out the crown.

    3. This causes [CITY] to flash on the display and the second hand to move to the current Home City.

    5660_HT_SET_comon

  3. Press (B) four times.

    4. [LIGHT] appears on the display with [1] or [3] flashing.

  4. Rotate the crown to select an illumination duration.

    5. [1]: 1.5-second illumination

    [3]: 3-second illumination

    5660_23_LT_Intro

  5. Push the crown back in to complete the setting operation.

Note

If you do not perform any operation for about two minutes after pulling out the crown, crown operations will automatically become disabled. If that happens, push the crown back in and then pull it out again.

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