background image
QW-1656
QW-1657
QW-1678
MODULE NO.
R
REF. NO. S/M-554
MAY 1997
BG-395L
(QW-1656)
BG-390A
(QW-1657)
BG-390V
(QW-1678)
SERVICE MANUAL
& PARTS LIST
(WITHOUT PRICE)
INDEX


background image
CONTENTS
1. SPECIFICATIONS: QW-1656/1657/1678 ...................................................... 1
2. OPERATION CHART
2-1. MODULE QW-1656 ...........................................................................................
2
2-2. MODULE QW-1657 ...........................................................................................
3
2-3. MODULE QW-1678 ...........................................................................................
4
3. DRAWINGS
3-1. BLOCK DIAGRAMS: QW-1656/1657/1678 ......................................................
5
3-2. CHECKING TERMINALS AND COMPONENTS: QW-1656/1657/1678 ..........
7
4. EXPLODED VIEW: QW-1656/1657/1678 ...................................................... 8
5. PARTS LIST: QW-1656/1657/1678 ............................................................... 9
6. PRECAUTIONS FOR REPAIR: QW-1656/1657/1678
6-1. AC (ALL CLEAR) AND REMOVING OF MODULE ........................................
11
6-2. ACCURACY CHECKING ................................................................................
11


background image
-- 1 --
Detail
QW-1656
QW-1657
QW-1678
Battery
SR621W, SR1120W
Battery life
Approx. 15 months
Current consumption
4.8
µA maximum
Alarm system
Piezo plate on Back cover
Accuracy
±15 sec./month
Accuracy setting system
Trimmer capacitor
Accuracy checking
See page 11
Accuracy setting
+0.25 ~ +0.35 sec./day
Functions
· Shock resistant (G-SHOCK)
· Electro-luminescent backlight
· 1/100 sec. stopwatch
Measuring capacity: 23:59'59.99"
Measuring mode: Net time, split time, 1st-2nd place times
· Regular timekeeping: Hr, min, sec, am/pm, mo, date, day
· Auto-calendar (pre-programmed until the year 2039)
· Daily melody alarm (3 melodies and beep)
· Hourly time signals
· 12/24-hour formats
Item
1. SPECIFICATIONS: QW-1656/1657/1678


background image
-- 2 --
2. OPERATION CHART
2-1. QW-1656


background image
-- 3 --
2-2. QW-1657