SERVICE MANUAL
& PARTS LIST
(WITHOUT PRICE)
QW-1750
MODULE NO.
R
REF. NO. S/M-587
FEBRUARY 1998
AW-61
INDEX
CONTENTS
Page
1. SPECIFICATIONS: QW-1750 ..................................................................... 1
2. OPERATION CHART:QW-1750 ................................................................. 2
3. DRAWINGS
3-1. BLOCK DIAGRAMS: QW-1750 ....................................................................
3
3-2. CHECKING TERMINALS AND COMPONENTS: QW-1750 .........................
4
4. EXPLODED VIEW: QW-1750 ..................................................................... 5
5. PARTS LIST: QW-1750 .............................................................................. 6
6. EXPLODED VIEW: ANALOG BLOCK OF QW-1750 ................................ 7
7. PARTS LIST: ANALOG BLOCK OF QW-1750 ......................................... 8
8. PRECAUTIONS FOR REPAIR: QW-1750
8-1. AC (ALL CLEAR) AND REMOVING OF MODULE ......................................
9
8-2. HOW TO REMOVE CROWN WITH STEM ...................................................
9
8-3. ACCURACY CHECKING ...........................................................................
10
-- 1 --
1. SPECIFICATIONS: QW-1750
Battery
CR1616 (Digital), SR621SW (Analog)
Battery life
Approx. 2 years
Current consumption
2.34
µA maximum (Digital), 1.45 µA maximum (Analog)
Alarm system
Piezo plate on Back cover
Accuracy
±30 sec./month (Digital), ±20 sec./month (Analog)
Accuracy setting system
Pad selection (CG1 ~ CG3) (Digital), Chip capacitor (Analog)
Accuracy checking
See page 10
Accuracy setting
Unadjustable
Functions
· Electro-luminescent backlight
· 1/100 sec. stopwatch
Measuring capacity: 59'59.99"
Measuring mode: Net time, split time, 1st-2nd place times
· Regular timekeeping (Analog) Hour and minute hands
(Digital) Hr, min, sec, pm, date, day
· Auto-calendar (Set at 28 days for February)
· 12/24-hour formats
· Daily alarm
· Hourly time signal
Item
Detail
-- 2 --
2. OPERATION CHART: QW-1750
AB
M
GENERAL GUIDE
· Press M to change from mode to mode. After you perform an operation in any mode,
pressing M returns to the Timekeeping Mode.
Alarm Mode
v
Stopwatch Mode
P
Time Setting Mode
AB
M
P
Timekeeping Mode
v
v
Crown
v
TIMEKEEPING MODE
This section provides information on setting the time and
using the backlight.
· This watch features separate digital and analog
timekeeping. Note that digital time and analog time are
independent of each other, and must be set separately.
· In the Timekeeping Mode, press A to switch between the
12-hour and 24-hour formats.
· When the 12-hour format is selected, the PM indicator (P)
appears on the display to indicate "p.m." times. There is
no indicator for "a.m." times. Selecting the 24-hour format
causes the 24H indicator to appear on the display.
· The day of the week is displayed as shown below.
SU: Sunday
MO: Monday
TU: Tuesday
WE: Wednesday
TH: Thursday
FR: Friday
SA: Saturday
PM
indicator
Day of week
AB
M
P
Hour : Minutes
Seconds
Day
Hour hand
Minute hand
Crown
To set the digital time and date
1. Use M to enter the Time Setting Mode.
· The seconds digits flash, because they are selected.
2. Press B to change the selection in the following
sequence.
3. While the seconds digits are selected (flashing), press A to reset the seconds to 00.
· If you press A while the seconds count is in the range of 30 to 59, the seconds are
reset to 00 and 1 is added to the minutes. If the seconds count is in the range of 00 to
29, the minutes count is unchanged.
4. While any other digits (besides seconds) are selected (flashing), press A to increase
the number. While the day of the week is selected, pressing A advances to the next
day.
· Holding down A changes the current selection at high speed.
5. After you set the time and date, press M to go to the Timekeeping Mode.
· The watch does not make any allowance for leap years. Be sure to manually set
February 29 (when one occurs) to the appropriate date.
· If you do not operate any button for a few minutes while a selection is flashing, the
flashing stops and the watch goes back to the Timekeeping Mode automatically.
To set the analog time
1. Pull the crown out.
2. Set the hands by turning the crown.
3. Push the crown back in to restart timekeeping.
AB
M
P
Seconds
Hour
Minutes
Day of Week
Day
Month
About the backlight
In any mode, hold down B to illuminate the display.
· Note that pressing B not only turns on the backlight, but it also performs any other
function assigned to the B button in the mode you are in. See the explanations for
each section for details on the B button operation.
· If you want to turn on the backlight simply to illuminate the display the watch in the
Alarm or Time Setting Mode (without changing any setting), hold down B . After viewing
the display contents, be sure to press M to change to the Timekeeping Mode.
· The backlight of the watch employs an electro-luminescent (EL) light, which loses
illuminating power after very long use.
· The illumination provided by the backlight may be hard to see when viewed under
direct sunlight.
· The watch will emit an audible sound whenever the display is illuminated. This is caused
by a transistor that vibrates when the EL panel lights up. It does not indicate malfunction
of the watch.
AB
M
Alarm on indicator
Mode indicator
Hour : Minutes
Hourly time signal
on indicator
Hour
Minutes
Alarm Mode
ALARM MODE
When the Daily Alarm is turned on, the alarm sounds for 20
seconds at the preset time each day. Press B to stop the
alarm after it starts to sound.
When the Hourly Time Signal is turned on, the watch beeps
every hour on the hour.
To set the alarm time
1. Press B while in the Alarm Mode. The hour digits flash
on the display because they are
selected.
· This operation automatically turns on the Daily Alarm.
2. Press B to change the selection in the following
sequence.
· Pressing B while the minutes are selected (flashing) changes to the normal Alarm
Mode screen (no digits flashing).
3. Press A to increase the selected digits. Holding down A increases the selection at
high speed.
· The format (12-hour and 24-hour) of the alarm time matches the format you select for
normal timekeeping.
· When setting the alarm time using the 12-hour format, take care to set the time correctly
as a.m. (no indicator) or p.m. (P indicator).
4. After you set the alarm time, use B to return to the normal Alarm Mode screen.
· If you do not operate any button for a few minutes while a selection is flashing, the
flashing stops and the watch goes back to the Timekeeping Mode automatically.
· If you do not operate any button for a few minutes in the normal Alarm Mode (no
flashing), the watch goes back to the Timekeeping Mode automatically.
To turn the Daily Alarm and Hourly Time Signal on and off
Press A while in the Alarm Mode to change the status of the Daily Alarm and Hourly
Time Signal in the following sequence.
[Alarm ON Indicator/Hourly Time Signal ON Indicator]
To test the alarm
Hold down A while in the Alarm Mode to sound the alarm.
Daily Alarm Only
Both OFF
Both ON
Hourly Time
Signal only
STOPWATCH MODE
The Stopwatch Mode lets you measure elapsed time, split
times, and two finishes. The range of the stopwatch is 59
minutes, 59.99 seconds.
First runner
finishes.
Second runner
finishes. Record
time of first runner.
Record time of
second runner.
(a) Elapsed time measurement
AA
A
A
B
Start
Stop
Re-start
Stop
Clear
(b) Split time measurement
AB
B
A
B
Start
Split
Split release
Stop
Clear
(c) Split time and 1st-2nd place times
AB
A
B
B
Start
Split
Stop
Split release Clear
Mode indicator
Minutes
Seconds
1/100 of second
-- 3 --
3. DRAWINGS
3-1. BLOCK DIAGRAMS: QW-1750
L24
L23
L22
L21
L20
L19
L18
L17
L16
L15
L14
L13
L12
L1
1
L10
L9
L8
L7
LCY
LCZ
LCX
L6
L5
L4
L3
L2
L1
a6
a8
j8
j9
adg7
bc8
hi9
ef8
d6
d8
g6
g8
b6
f6
c6
e6
a9
d9
g9
b9
f9
c9
e9
b7
c7
e7
SPL
COL
SIG
ALM
PM
24H
ad5
f5
b5
e5
c5
g5
ad5
a4
f4
b4
e4
c4
g4
d4
ad3
f3
b3
e3
c3
g3
ad3
a1
f1
b1
e1
c1
g1
d1
a0
f0
b0
e0
c0
g0
d0
a2
f2
b2
e2
c2
g2
d2
L
C
D
XTB
XT
CG1
CG2
CG3
Xtal1
C4
C1
C2 C3
Tr
VR
LL1
PZ
+
BAT2
VBAT1
VCC
VC
VSS1
VSS2
VDD
BD
N1
N2
N3
V2 T3
T1
T2
T4
S1
S3
S4
MOT1 (7)
MOT2 (5)
V2 (9)
(8) TEST
(3) RESET
AC
LCX
LCY
LCZ
L1
L24
TOTAL
BONDING
51PINS
49PINS
TOTAL
BONDING
9Pins
8Pins
LSI (CMOS1)
(JT9638A-AS)
LSI (CMOS2)
(e1218DVE)
(4)
VSS
(6)
VDD
(1)
OSCIN
(2)
OSCOUT
BAT1
C6
Xtal2
R
Tns
EL1
EL2
C5
Tr2
An. B
PE
PF
SE
BACK
FRONT
BACK
FRONT
SF
V2 No bonding
V2 VBAT2
LCZ
b3
f3
b4
a4
b5
f5
PM
24H
d9
e9
c9
g8
d8
b2
c7
e6
c6
d6
b0
a0
b1
a1
a2
f2
L 1
L 2
L 3
L 4
L 5
L 6
L 7
L 8
L 9
L10
L11
L12
L13
L14
L15
L16
L17
L18
L19
L20
L21
L22
L23
L24
COM
SEG
LCX
c3
ad3
d4
e4
c5
e5
ALM
SIG
j9
f9
a9
j8
a8
e7
b7
f6
a6
d0
e0
c1
d1
e1
c2
d2
LCY
g3
e3
c4
g4
g5
ad5
f4
COL
g9
hi9
b9
ef8
bc8
SPL
adg7
g6
b6
c0
g0
f0
g1
f1
g2
e2