Seiko 7d46A Quick start guide

1
PARTS CATALOGUE/TECHNICAL GUIDE
Cal. 7D46A, 7D48A
【SPECIFICATIONS】
Item Cal. No. 7D46A, 7D48A
Movement
Movement
size Outside diameter φ３２.０mm
Casing diameter φ３０．０ mm
Height ６.１mm
3 hands (Hour and minute hands: 5-second interval movement, Second
hand: 1-second interval movement), 24-hour hand
Time indication
(Movement intervals) Calendar
Year indication: Indication disk for year (7D48A), Year indication hand (7D46A)
Month indication:：Month indicator
Date indication: Big calendar
Driving system Step motor: 2 pieces ・Piezoelectric motor (for calendar)
Additional mechanism ●Automatic generating system
●Energy depletion forewarning function
●Overcharge prevention function
●Electronic circuit reset switch
●Train wheel setting device
●Instant setting device for date calendar
●Automatic power save function
●Time relay function
●Perpetual calendar (Year • Month • Date) up to February 28, 2100

Loss/gain Monthly rate at normal temperature range: less than 15 seconds
Regulation system Nil
Measuring gate by
quartz tester Use 10-second gate.
Power generator Automatic generating system
Power
supply
Electricity
storage Unit
(E.S. Unit)
Titanium lithium ion rechargeable battery
Operating voltage range 0.45 ｖ〜2.5 ｖ
Continuous operating
time Operable time of time relay function: approximately 4 years if fully charged
Jewels 16 jewels
SEIKOWATCHCORPORATION
SEIKOWATCHCORPORATIONSEIKOWATCHCORPORATION
SEIKOWATCHCORPORATION



REMARKS ON REPAIRING CAL. 7D46A, 7D48A
Cal. 7D** is an Automatic Generating System analog quartzwatch equipped with
piezoelectric motor, featuring the perpetual calendar and automatic adjustment function.
Although Cal.7D** features new functions, the experience of repairing the existing
KINETICseries watches will be helpful.
In repairing Cal. 7D**, you are requested to have the full knowledge of its functions and
strictly observe the repairing and checking instructions provided in this guide so that the
watch will be repaired correctly.
FEATURES OF CAL. 7D46A, 7D48A
Cal. 7D** features the power save function that automatically stops the hands from
moving if the watch is leftuntouched for a certain period of time. Even if the watch is in
this state, the perpetual calendar continues to count the date until the stored electrical
energyis depleted. When you decide to use it again, swinging the watch several times will
activate the time relay function, which starts the hands moving quickly to indicate the
correct timeand resume the normal operation. Cal. 7D** is an innovative KINETIC
model; it conserves the stored electrical energy by stopping the hands while it is not in
use, and, at the same time, it completely eliminates the cumbersome time setting
procedure when it is used again.
1. POWER SAVE FUNCTION
 While the watch is not in use, the hands stop automatically to minimize the electrical
energyconsumed. This is called “the power save function”. Though the hands stop,
the built-in IC continues to compute the time, keeping the watch ready for the next
use.
 <The automatic power save function>
If the watch is left untouched for approximately 24 hours, the power save function is
automatically activated.
2. TIME RELAY FUNCTION
 While the power saving function is working, the built-in IC continues to compute the
time though the hands stop. As the watch detects a certain amount of electricity
generated by swinging it, the hands are automatically adjusted to the time retained
inside the watch, resuming the normal operation. This is called the “time relay
function”. As it is activated, the hour and minute hands are adjusted first, then,
followed by the second hand.
 By only swinging the watch for 2 to 3 seconds, the time relay function will be
activated.
(Caution)
 It may take approximately up to 64 seconds (32 seconds on average) to activate
the time relay function.
 The accuracy of the time computation by the built-in IC is equivalent to that of
conventional quartz watches. Especially when the watch has been left untouched
for a long time before the time relay function is activated, the time indicated by the
hands may include a certain amount of time loss or gain within the range of the
accuracy of the watch (±15 seconds per month) that has accumulated during that
time.
3. CONTINUOUS OPERATING TIME
●The continuous operating time varies depending on the stored electrical energy inside
the watch. In the case that the fully charged watch enters the power save mode,
2

3
the time relay function of the watch remains operable for approximately four years.
(Caution)
◆If the stored electrical energy is completely depleted while the watch is in the
power save mode, swinging the watch may not activate the time relay function.
Instead, the second hand starts moving at two-second intervals.
4. PERPETUAL CALENDAR
●The perpetual calendar automatically adjusts the date up to February 28, 2100. Even if
the watch is in the power save mode, the calendar continues to function as normal.
(Caution)
 The date changes between 23:30 and 0:30.
 Normally it takes approximately 2 seconds for the watch to change the date.
However it may take up to 2 minutes especially during the wintertime or when the
stored electrical energy is being depleted.
 Even though the watch is reactivated after the stored electrical energy has become
extremely low, the calendar can be easily adjusted manually.
 When the watch is in power save mode, and the date does not change correctly (or
shows the wrong date), the electrical power stored in the rechargeable battery is
being depleted. Before starting to wear the watch, recharge the watch until the
second hand no longer moves at two-second intervals and then reset the time and
calendar.
5. TIME AND CALENDAR SETTING
● It is recommended that you adjust the time and/or calendar during the time between
1:00 and 23:00.
● If you adjust the time and/or calendar around 0:00, the date may become incorrect,
but this is not a malfunction.
● When the watch moves at two-second intervals, the date stops changing.
● When the watch no longer moves at two-second intervals after it is recharged, reset
the calendar.
● When the date is set to a non-existing date, such as February 30, the calendar
automatically correct the date. (When the date is set to February 30, the calendar
automatically shows March 1).
● When the stored electrical energy is completely depleted, and the watch is stopped,
recharge the watch until it no longer moves at 2-second intervals and reset the time
and calendar.

 Oscillating
 weight screw
 0022 490
 Oscillating weight
 0500 531
 Oscillating weight wheel
 1002 504
 Rechargeable battery
 clamp screw
 0012 354
 Rechargeable
 battery clamp
 4225 542
 Rechargeable
 battery unit (MT920)
 3023 24X
 Insulator for
 rechargeable battery
 4216 541
Case back
1
2
3
4
5
6
7
Remarks on removing the winding stem
To remove the winding stem when taking out the
movement from the case or while disassembling
the parts during repair work, be sure to pull out
the crown to the first click, and then, remove the
winding stem while pushing the setting lever.
- 4 -

Crown
Case
Second hand
Minute hand
Hour hand
Month indicator
Dial
24-hour hand
- 5 -
※Year indicator hand
for cal.7D46A

1.Positioning pin for spring
for intermediate wheel
for month indicator
Train wheel bridge
for calendar screw
0012 354
Date dial
for units digit
(0878 A85)
Date dial
for ten's digit
(0878 A84)
Date dial holder
for trans wheel
for units digit
0839 506
Train wheel bridge
for calendar
0125 508
Jumper for year
1024 503
Jumper
for units digit
1024 500
13
To be removed while assembling
To be removed while assembling
1.Supporting pin for alignment
8
10
9
11
12
14
15
Indication disk
for year
1023 560
- 6 -
※ 2.This is the repairing tool.
(7D48A-JP)
Pl ease look at the Watch
Catalogue.
※2.This is the repairing tool.
(7D48A-JP)
P lease look at the Watch
Repairing Tool Catalogue.
Repairing Tool
(for Cal.7D48A)

Indicator on wheel for month
1021 503
Detection on wheel for month
1002 510
Intermediate wheel
for year indicator
0817 516
Detection on wheel for year
1002 511
Indicator on wheel for year
1021 504 (for cal.7D48A)
Driving on wheel for year
0802 507
22
Indicator on wheel
for 24h
1021 502
Intermediate wheel
for month indicator
0817 515
23
Detection on wheel
for 24h
1002 509
24
25
2nd intermediate wheel
for calendar
0817 513
26
Control wheel
1002 507
27
Screw for piezoelectric
motor cover
0022 230
28
Piezoelectric motor
cover
0839 505
16
17
18
19
20
21
Supporting pin for alignment
To be set for assembling
- 7 -
1021 505 (for cal.7D46A)
7D467D48

29
 Piezoelectric motor
 connecting spring
 1018 500
30
 1st intermediate wheel
 for calendar
 0817 512
31
 Piezoelectric rotor block
 4146 514
32
 Insulator for
 piezoelectric motor
 4216 540
33
 Piezoelectric motor lead plate
 0105 502

34
 Piezoelectric stator block
 4583 500
35
 Jumper for month
1024 504
36
 Spring for intermediate
 wheel for month indicator
 1024 503
37
 Jumper for ten's digits
 1024 501
Positioning pin for spring
for intermediate wheel
for month indicator
To be set for assembling
- 8 -