Casio 5378 Operation Guide

Operation Guide 5378

Be sure to keep all user documentation handy for future reference.

Your watch may differ somewhat from the one shown in the illustration.

Some models may use a combination of hands and rotating disks to indicate information. The word “hand” in this section is used to mean both analog hands and rotating disks.

Hour Hand	Minute Hand
		A	Click 2
Stopwatch Minute Hand		Click 1
Second Hand
L		B
L		B
		Crown
Stopwatch Second Hand	Day Indicator
24 Hour Hand

Stopwatch functions

To adjust the time setting

When the second hand is at

12 o’clock, pull the Crown out to Click 2.

Rotate the Crown to change the time setting.

Push the Crown back in.

Note

Take care that you set the correct AM or PM time.

When changing the time, move the minute hand four or ﬁ ve minutes past your ﬁ nal setting, and then back it up to the setting you want.

To change the day indicator setting

Pull the Crown out to Click 1.

Rotate the Crown to set the day.

Push the Crown back in.

Note

The day indicator setting uses a 31day month. Make adjustments for months of shorter lengths.

Avoid changing the day indicator setting between the hours of 9 p.m. and 1 a.m. Otherwise, the day

indicator may not change correctly at midnight.

Crown Operations

Some water-resistant models (100 meters, 200 meters) have a screw-in crown. When you need to perform a crown operation, rotate it towards you to unscrew it. Then pull the crown out. Avoid applying undue force when pulling. The watch loses its water resistance while the crown is unscrewed. After performing a crown operation, fully screw the crown back in.

If your watch has a rotary bezel...

You can rotate the bezel to align its ▼ mark with the minute hand. Then you will be able to tell how much time has elapsed since aligning the ▼ mark.

Current

Crown

Loosen

Start

Elapsed time

Using the Stopwatch

The stopwatch measures elapsed time in 1-second increments up to 59 minutes, 59 seconds.

Elapsed time
A	A	A	A	B
Start	Stop	Re-start	Stop	Reset
Split time
A	B	B	A	B
Start	Split	Split release	Stop	Reset
Two ﬁnishes
A	B	A	B	B
Start	Split	Stop	Split release	Reset
	First runner	Second runner	Display time of
	ﬁ nishes.	ﬁ nishes.	second runner.
	Display time of
	ﬁ rst runner.

Important!

Do not operate the stopwatch with the crown pulled out.

Note

An elapsed time operation will stop automatically at the end of 60 minutes.

Correcting the 0 Positions of the Hands

Perform the following procedure if the stopwatch hands do not return to their 0 (zero) positions when you reset the stopwatch.

Pull the Crown out to Click 2.

Use B (clockwise) and A (counterclockwise) to move the

Stopwatch Second Hand and Stopwatch Minute Hand to 12 o'clock.

Holding down either button will move the second hand at high speed, until you release the button.

The Stopwatch Minute Hand is syncronized with the Stopwatch Second Hand .

After all of the hands are the way you want, push the Crown back in.

Important!

Timekeeping stops while the crown is pulled out. Correct the current time setting after performing the above operation.

To turn on illumination

Hold down L.

Note

Illumination remains turned on as long as L is depressed.

Illumination will turn off about four seconds after L is released.

Illumination Precautions

Illumination may be hard to see when viewed under direct sunlight.

Frequent use of illumination runs down the battery.

Speciﬁcations

Accuracy: ±20 seconds average per month

Stopwatch: Measuring Capacity: 59'59" (60 minutes) Measuring Unit: 1 second

Measurements: Elapsed time; split time; two ﬁ nishes Illumination: LED (light-emitting diode)

Battery: One silver oxide battery (Type: SR920SW) and one lithium battery (Type: CR1616)

Battery Life: Approximately 2 years (60 minutes stopwatch operation and 16 seconds illumination per day)

Always have both batteries replaced at the same time.