Casio QW-1789 Service Manual & Spare Parts List
SERVICE MANUAL
& PARTS LIST
REF. NO. S/M-625
DEC 1998
MODULE NO.
QW-1789
MRG-121
R
(WITHOUT PRICE)
Ver. 1 Oct. 2001
CONTENTS
1. SPECIFICATIONS: QW-1789........................................................................ 1
2. OPERATION CHART: QW-1789................................................................... 1
3. EXPLODED VIEW: QW-1789........................................................................ 2
4. PARTS LIST: QW-1789................................................................................. 3
5. PRECAUTIONS FOR REPAIR: QW-1789
5-1.HOW TO REMOVE THE BATTERY ....................................................... 4
5-2.HOW TO REMOVE CROWN WITH STEM ............................................. 4
5-3.HOW TO REMOVE HANDS ................................................................... 5
5-4.HOW TO INSERT THE BATTERY ......................................................... 5
1. SPECIFICATIONS: QW-1789
Module (Movement No.) QW-1789
Display system Three hands & EL backlight
Accuracy setting Unadjustable
Accuracy ±20sec./month
Number of jewels 0
Time correction Crown type
Battery type CR2016
Battery life Approx. 3 years
Current consumption 1.18 µA maximum
Ambient temperature range –5°C ~ 55°C
Functions Shock resist
Notes: Conditions of battery life.
• EL backlight is used 3 times per day ------------------------------- 2 years
• EL backlight is used 5 times per day ----------------------------- 1.5 years
2. OPERATION CHART: QW-1789
The physical configuration the watches covered by this User’s Guide differs according to model as shown below. Functions and operation procedures are identical, regardless of physical configuration.
LL
L
(Light button)
LL
Crown
Crown
(Light button)
LL
L
LL
To Set Time
1)Pull the crown out when the second hand is at 12 o’clock position and the second
hand stops.
2)Turn the hands clockwise and put the watch four or five minutes forward. Then
back them out.
3)In accordance with a time signal, push the crown in.
About the backlight
LL
• Pressing
L illuminates the display for about two seconds.
LL
• The backlight of this watch employs an electroluminescent (EL) light, which loses
its illuminating power after very long term use.
• Frequent use of the backlight shortens the battery life.
For watch with the elapsed time bezel
Rotate the elapsed time bezel to align the
with the minute hand.
After certain amount of time elapsed, read the graduation on the elapsed time bezel which the minute
hand points to.
The elapsed time is indicated.
• Some water resistant models are equipped
with a screw lock crown.
• With such models, you must unscrew the
crown in the direction noted in the illustration to loosen it before you can pull it out.
Do not pull too forcibly on such crowns.
• Also note that such watches are not water
resistant while their crowns are loosened.
Be sure to screw the crowns back in as far
as they will go after making any setting.
mark
Elapsed time bezel
10
50
20
40
30
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