Seiko 7T82A Quick start guide

PARTS CATALOGUE/TECHNICALGUIDE
Cal. 7T82A
[SPECIFICATIONS]
Cal. No.
Item
Movement
Movement
size
Time indication
Outside diameter
Casing diameter
Height
Driving system
Additional mechanism
Loss/gain
Regulation system
Measuring gate by quartz tester
Battery Battery No.
Voltage
Battery life
Jewels
1/26
(x 1.0)
Ø 27.0 mm
Ø 27.6 mm
3.3 mm
Main time: Hour, minute and small second hands (1 second)
Nil
Step motor
• Electronic circuit reset switch
• Train wheel setting device
• Date calendar
• Instant setting device for date calendar
• Battery life indicator (The small second hand moves at two-second
intervals.)
• System reset
Monthly rate at normal temperature range: less than 15 seconds
Use 10-second gate.
SR927W
Nil
1.55 V
Approx. 3 years
•STOPWATCH functions
40-minute measurement in 1/100-second increments, consecutively
measureable up to 120 minutes.
Accumulated elapsed time measurement
Split time measurement
STOPWATCH hand position adjustement
4 pcs.
7T82A
• STOPWATCH:
STOPWATCH minute hand (40 minutes)
STOPWATCH second hand
STOPWATCH 1/10-second hand
STOPWATCH 1/100-second hand
(Movement intervals)

REMARKS ON REPAIRING CAL. 7T82A
2/26
The basic movement structures of Cal. 7T82A is similar to the previous Cal. 7T Series watches,
and the knowledge and technique you have gained in handling the previous Cal. 7T Series
watches will come in handy when you repair Cal. 7T82A.
When repairing, however, you are requested to have the full knowledge of the features character-
istic of these watches and strictly observe the repairing and checking instructions provided in this
guide so that the watches will be repaired correctly.
I. FEATURES
As Cal. 7T82A has new movement structures, time setting and STOPWATCH hand position adjust-
ment differ from those of the other Cal. 7T Series watches.
As a result of this structure change, the battery life of Cal. 7T82A has increased to 3 years as com-
pared with that of the other Cal. 7T series watches.
●Measurement performance
Displays the elapsed time with the 4 designated STOPWATCH hands.
Measures up to 40 minutes in 1/100 second increments.
●Button operation (Crown position: Normal position)
Button A: START/STOP
Button B: SPLIT/SPLIT RELEASE/RESET
●Measurement functions
Accumulated elapsed time measurement and split time measurement are available.
1. STOPWATCH FUNTION
1/100 SEC.
012
3
4
5
6
7
89
60
15
30
45
0
10
20
30
40
MIN.
STOPWATCH 1/10 second hand
Small second hand STOPWATCH minute hand
Button B
Crown
Button A
STOPWATCH 1/100 second hand
STOPWATCH second hand
Cal. 7T82A
1/100-second chronograph
2. SYSTEM RESET
When an abnormal display appears, reset the built-in integrated circuit. The watch will resume its
normal operation.
 ● Button operation (Crown position: Second click)
Press and hold buttons A and B at the same time for longer than 2 seconds.

REMARKS ON REPAIRING CAL. 7T82A
3/26
After installing the battery, reset the built-in integrated circuit, and then set the time and reset
the STOPWATCH hands to the "0" position following the procedure below.
II. NECESSARY PROCEDURE AFTER BATTERY CHANGE
Pull out to the 2nd click when the small second hand is at the
12 o’ clock position.
Turn to set the main time.
* Check that AM/PM is correctly set.
Pull out the crown to the 2nd click.
Press and hold both buttons A and B at the same time for longer than 2 seconds.
Button A
Crown
Crown
Systen Reset
Note*
Push back in to the normal position in accordance with a time signal.
Crown
Note* Pressing Button A for longer than 2 seconds here will allow you to resume the procedure again
as indicated by the arrow if neccessary.
Button B
Button A
Button B
Button A
Button B
Press Button A for longer than 2 seconds.
The STOPWATCH 1/100 second hand turns a full circle.
Press Button B to set the STOPWATCH
1/100 second hand to the “0” position.
Press Button A for longer than 2 seconds.
The STOPWATCH second hand turns a full circle.
Press Button B to set the STOPWATCH
second hand to the “0” position.
Press Button A for longer than 2 seconds.
The STOPWATCH minute hand turns a full circle.
Press Button B to set the STOPWATCH minute hand to
the “0” position.

Cal. 7T82A
PARTS CATALOGUE
4/26
Lubricating of some parts is shown in "II. REMARKS ON DISASSEMBLING AND REASSEMBLING."
2 0808 580
Date dial guard
3 0878 526
Date dial
4 0962 580
Intermediate wheel
for calendar correction
5 0737 580
Date corrector setting wheel
6 0802 580
Date driving wheel
7 0271 583
Chronograph 1/10 second
counting wheel
8 0271 588
Hour wheel
1 0027 973
Pin for date dial guard
Disassembling procedures Figs. : 1 56
Reassembling procedures Figs. : 56 1
Remarks on removing the winding stem
To remove the winding stem when taking
out the movement from the case or while
disassembling the par ts 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.
* For the type of oil and quantity of lubrication, refer to the following TECHNICAL GUIDE section.

PARTS CATALOGUE Cal. 7T82A
5/26
4259509
Anti magnetic shield plate B
9
3013 250 (SR927W)
Battery
10
0022 230
Battery clamp screw
11
4225 546
Battery clamp
12
0022 459
Circuit block cover screw
13
4457 980
Circuit block cover
14
4224 514
Conducting plate
15
0396 580
Friction spring for second counting
16
4000 610
Circuit block
17
0022 459
Circuit block cover screw
( 3 pcs.)
0022 230
Battery clamp screw (3 pcs.)
Lubricating of some parts is shown in "II. REMARKS ON DISASSEMBLING AND REASSEMBLING."

Cal. 7T82A
PARTS CATALOGUE
6/26
4270 710
Battery connection (–)
18
0240 580
Small second wheel
21
0701 580
Fifth wheel & pinion
24
0885 592
Chronograph intermediate wheel for
1/100 second
26
0885 594
Chronograph first intermediate
wheel for second
28
0888 593
Chronograph 1/100 second
counting wheel
29
4283 581
Spacer for center wheel & pinion
32
0885 595
Chronograph second intermediate
wheel for second
33
4146 710
Step rotor
35
4146 710
Chronograph rotor for second
37
4146 710
Chronograph rotor for 1/100 second
38
0027 974
Pin for train wheel bridge
19
0125 509
Train wheel bridge
20
0888 582
Chronograph second counting
wheel
22
0241 583
Fourth wheel & pinion
23
0231 580
Third wheel & pinion
25
0950 590
Chronograph intermediate minute
counting wheel
27
0270 582
Chronograph minute counting
wheel
30
0261 580
Minute wheel
31
4450 703
Switch lever A
34
4146 710
Chronograph rotor for minute
36
0383 592
Setting lever
39
0384 582
Yoke
40
0351 583
Winding stem
41
Lubricating of some parts is shown in "II. REMARKS ON DISASSEMBLING AND REASSEMBLING."

PARTS CATALOGUE Cal. 7T82A
7/26
0281 580
Setting wheel
42
0885 593
Chronograph intermediate wheel
for 1/10 second
43
0282 585
Clutch wheel
44
0221 583
Center wheel & pinion
45
4002 700
Coil block (A)
46
4002 700
Coil block for chronograph second
47
0391 591
Train wheel setting lever
48
4239 710
Rotor stator
49
4002 711
Coil block for chronograph
minute
51
4002 711
Coil block for chronograph 1/100
second
52
4239 712
Rotor stator for chronograph
minute
53
4450 701
Switch lever B
55
4239 711
Rotor stator
for chronograph second
50
4239 713
Rotor stator for chronograph
1/100 second
54
0100 559
Main plate
56
Lubricating of some parts is shown in "II. REMARKS ON DISASSEMBLING AND REASSEMBLING."

Cal. 7T82A
PARTS CATALOGUE
8/26
The correct parts for the followings are determined based on the design of cases. Check the case
number, and refer to "Watch Parts Catalogue CD-ROM" to choose corresponding parts.
 ✳ Holding ring for dial (0866 651)
3 Date dial (0878 526)
41 Winding stem (0351 583)
• Point of distinction
Refer to the illustrations below to see the difference between those two types of pins.
1 Pin for date dial guard
0027 973
20 Pin for train wheel bridge
0027 974

Cal. 7T82A TE C HNICAL GUIDE
9/26
No.

PROCESS

ILLUSTRATIONS AND SPECIAL INSTRUCTIONS ETC.


Assembling the
switching unit and
wheels

56Set the main plate.


Lubricate the lower
pivots of the rotors.



Lubricate the
contact area
between the small
second wheel and
main plate.


Lubricate the point
of engagement of
the switch lever B.

Lubricate the axis of
the switch lever B.










<56> Set the main plate.
Lubricate the contact area between the small
second wheel and main plate: Moebius F or AO-2
<Amount of lubricant
Refer to the illustrations below to see the right
amount of lubricant.
(a) (b) (c)
(a) Overlubricated
(b) Appropriately lubricated
(c) Underlubricated
Appropriate amount(Stone)
Appropriate amount(Convex part)
Appropriate amountS-6
Lubricate the point of engagement of
the switch lever B: S-6
Lubricate the axis of the switch lever B: Moebius V or AO-3
Lubricate the lower pivots of the rotors: Moebius F or AO-2

Cal. 7T82A TE C HNICAL GUIDE
10/26
NO.

PROCESS

ILLUSTRATIONS AND SPECIAL INSTRUCTIONS ETC.

55 Set the switch lever B.

54
Set the rotor stator for
chronograph 1/100
second.

Lubricate the axis of the
setting wheel.

53 Set the rotor stator for
chronograph minute.

52, 51
Set the coil blocks for
chronograph 1/100
second and chronograph
minute.

50, 49
Set the rotor stator for
chronograph second,
and rotor stator.

48 Set the train wheel
setting lever.

47, 46
Set the coil block for
chronograph second and
the coil block (A).

54
Set the rotor stator for
chronograph 1/100 second.
50, 49
Rotor stator for chronograph
second




Discrimination number
Set the rotor stator

Discrimination number0


47, 46Set the coil block for chronograph second and the coil block (A).
Coil resistance: 2.10 K2.70 K
55
Set the switch lever B.
52, 51
Set the coil blocks for chronograph 1/100 second and
chronograph minute.
Coil resistance: 1.80 K2.40 K
53
Set the rotor stator for
chronograph minute.
Lubricate the axis of the setting
wheel: Moebius V or AO-3
48
Set the train wheel setting lever.

C al. 7 T8 2 A T EC HN IC A L G U IDE
11/26
NO.

PROCESS

ILLUSTRATIONS AND SPECIAL INSTRUCTIONS ETC.

45
Set the center wheel &
pinion and lubricate its
convex part and inner
edge of the ring.

44 Set the clutch wheel.

43
Set the chronograph
intermediate wheel for
1/10 second.

42 Set the setting wheel.

41 Set and lubricate the
winding stem.

40 Set the yoke.

39 Set the setting lever.

38, 37
Set the chronograph rotor
for 1/100 second and
chronograph rotor for
second.
36, 35 Set the chronograph rotor
for minute and step rotor.






Dark gray
38,37,36,35Set the chronograph rotor for 1/100 second, chronograph rotor for second, chronograph
rotor for minute and step rotor.
45
Set the center wheel & pinion and lubricate as
illustrated below.2 points: Moebius AII or
AO-3
43Set the chronograph
intermediate wheel for 1/10
second.
44Set the clutch wheel.
42Set the setting wheel.
41Set and lubricate the winding stem:
Lubricate the entire profile of the winding stem with
Moebius V or AO-3.
39Set the setting lever.
Crown at the normal position.
40Set the yoke.
Remember to install the winding stem before
setting the yoke. Otherwise the spring of yoke
will lift the clutch wheel upward.
The reset spring of the yoke is easily deformable.
Handle it with extra care as deformation of the
spring can cause reset failure as well as mode
change malfunction.

Cal. 7T82A TE C HNICAL GUIDE
12/26
No.

PROCESS

ILLUSTRATIONS AND SPECIAL INSTRUCTIONS ETC.


Lubricate the switching
unit.


Point of contact
between the train wheel
setting lever and yoke.


Point of contact in
the tail portion of the
yoke.


Point of contact
between the yoke and
setting lever.


Axis of the setting
lever


Axis of the switch
lever A


Point of engagement
of the switch lever A



34

Set the switch lever A.
































Lubricate the point of contact between the train wheel
setting lever and yoke. (Lubricate the two points with
either Moebius V or AO-3.
Lubricate the axis of the switch lever A. (:
S-6
<34> Set the switch lever A.
Lubricate the point of contact in the tail portion of
the yoke. (: Moebius V or AO-3
Lubricate the point of contact between the yoke
and setting lever. (: S-6
Lubricate the axis of the setting lever. (: S-6
Lubricate the point of engagement of the switch
lever A. (: S-6

C al. 7 T8 2 A T EC HN IC A L G U IDE
13/26
NO.

PROCESS

ILLUSTRATIONS AND SPECIAL INSTRUCTIONS ETC.

33
Set the chronograph
second intermediate
wheel for second.

32 Set the spacer for center
wheel & pinion. 

31 Set the minute wheel.

30, 29
Set the chronograph
minute counting wheel
and chronograph
1/100-second counting
wheel.

Lubricate the point of
contact of the spacer for
center wheel & pinion.

28
Set the chronograph first
intermediate wheel for
second.


27Set the chronograph
minute counting wheel. 

26
Set the chronograph
intermediate wheel for
1/100 second.

25,24
Set the fifth wheel and
pinion and third wheel
and pinion.

23Set the fourth wheel and
pinion. 

22
Set and lubricate the
chronograph second
counting wheel.

21 Set the small second
wheel.
28Set the chronograph first intermediate wheel for second.
25,24Set the fifth wheel and pinion and
third wheel and pinion.
32Set the spacer for center wheel & pinion.
31Set the minute wheel.
30, 29
Set the chronograph minute
counting wheel and chronograph
1/100-second counting wheel.
23Set the fourth wheel & pinion.
22
Set and lubricate the chronograph second counting
wheel as illustrated above.
Lubricate the point of contact of the spacer for center
wheel & pinion: Moebius A or AO-3.
21Set the small second wheel.
27Set the chronograph minute
counting wheel.
White
33Set the chronograph second
intermediate wheel for second.
Dark green
Translucent
Lubricate the point of contact of the
spacer for center wheel & pinion
Moebius A or AO-3
26Set the chronograph
intermediate wheel for 1/100 second.
Chronograph minute counting
wheel

Cal. 7T82A TE C HNICAL GUIDE
14/26
No.

PROCESS

ILLUSTRATIONS AND SPECIAL INSTRUCTIONS ETC.

20Set the train wheel
bridge.

19Set the pin for train
wheel bridge.

18Set the battery
connection (-)


Lubricate the upper
pivots of the
chronograph rotor for
1/100 second,
chronograph rotor for
second, chronograph
rotor for minute and
step rotor.

1
Lubricate the upper
pivots of the minute
wheel, chronograph
minute counting
wheel, chronograph
second counting
wheel and small
second wheel.









<20> Set the train wheel bridge.
Minute wheel
*1Do not lubricate the upper pivot of the chronograph 1/100 second counting wheel.
4 points to be lubricated as illustrated above.
Other portions
Upper pivot of the rotor
Lubricate the upper pivots of the minute wheel, chronograph minute counting wheel, chronograph second counting
wheel and small second wheel: Moebius F or AO-2.
<19> Set the pin for train wheel bridge.
Turn the pin 90-degree clockwise to
fix it using a screwdriver.
Make sure that the pin is put in the
correct direction.
Never turn the pin more than 90
degrees.
Lubricate the upper pivots of the chronograph rotor for 1/100 second, chronograph rotor for second,
chronograph rotor for minute and step rotorMoebius F or AO-2
Lubricate the upper pivot of each rotor (at four points) illustrated below.
<18> Set the battery connection (-).

Cal. 7T82A TE C HNICAL GUIDE
15/26
NO.

PROCESS

ILLUSTRATIONS AND SPECIAL INSTRUCTIONS ETC.


Assembling the
circuit unit

17Set the circuit block.

16
Set the friction
spring for second
counting.

15Set the conducting
plate.

14Set the circuit block
cover.
Securely engage the
four hooks.

13Tighten the circuit
block cover screws.
3 positions





















15Set the conducting plate.
13
Tighten the circuit block cover screws (3 positions.)
17Set the circuit block.
Make sure that the circuit block is securely engaged with the two
guide pins of the train wheel bridge.
Take care so as not to deform these parts while setting the circuit
block.
Remarks on installing the circuit block cover. (hooking portions)
• Take care so as not to deform the rotor stator or coil block.
• Make sure that the circuit block cover is correctly aligned with the two pins of the train wheel bridge.
* Inaccurate alignment of the circuit block cover can cause malfunction of the yoke, resulting in defects
of date correcting function.
• The hook of the circuit block cover is easily disengaged. Make sure that it is securely engaged with
the pins all the way in at the four locations.
• Unhook the circuit block cover from a side angle using a pair of tweezers or a screwdriver while
gently pressing it down.
• The conductive spr ing of the ci rcuit bl oc k cover is easily deformab le. Handle it with
care so as n ot to d ef or m it.
16Set the friction spring for
second counting.
14Set the circuit block cover.
Securely engage the four hooks.

Cal. 7T82A TE C HNICAL GUIDE
16/26
NO.
PROCESS
ILLUSTRATIONS AND SPECIAL INSTRUCTIONS ETC.

12 Set the battery
clamp.

11
Tighten the battery
clamp screws.
(3 positions)

Measure the
current
consumption.





































11Tighten the battery clamp screws. (3 positions)
12Set the battery clamp.

C al. 7 T8 2 A T EC HN IC A L G U IDE
17/26
No.

PROCESS

ILLUSTRATIONS AND SPECIAL INSTRUCTIONS ETC.


As semblin g the
calendar unit .
8 Set the hour wheel.

7
Set the chronograph
1/10 second counting
wheel.

6 Set the date driving
wheel.

5
Set the date
corrector setting
wheel.

4
Set the intermediate
wheel for calendar
correction.


Lubricate the point
of contact between
the date dial and
main plate.

3Set the date dial.









The hour wheel is made of plastic.
Make sure that the gear teeth are
properly engaged when setting the
hour wheel.
<3> Set the date wheel.
Number of gear teeth is 28.
<8> Set the hour wheel.
<6> Set the date driving wheel.
<7>
Set the chronograph 1/10 second counting wheel.
<5> Set the date corrector setting wheel.
<4> Set the intermediate wheel for calendar correction.
Lubricate the point of contact between the date
dial and main
p
lateMoebius A or AO-3

Cal. 7T82A TE C HNICAL GUIDE
18/26
No.

PROCESS

ILLUSTRATIONS AND SPECIAL INSTRUCTIONS ETC.

2 Set the date dial
guard.

Set the jumper.

1
Set the pins for date
dial guard.
(2 positions)

Lubricate the points
of contact between:
Date dial and
date jumper.
Main plate and
date jumper.
Date dial guard and
date jumper.






















<2> Set the date dial guard.



Lubricating points of the calendar wheels: contact points between
Date dial and date jumperMoebius F or AO-2
Main plate and date jumper: Moebius F or AO-2
Date dial guard and date jumperMoebius F or AO-2
<1> Set the date dial guard.2 positions
Turn the pin 90-degree clockwise to fix itusing a screwdriver.
Never turn the pin more than 90 degrees.

Cal. 7T82A TE C HNICAL GUIDE
19/26
No.

PROCESS

SPECIFICATIONS (QUALITY SPECIFICATIONS,
HANDLING METHODS ETC.)

ILLUSTRATIONS AND SPECIAL INSTRUCTIONS ETC.


Assemblin g the
case
10Set the battery.Pay extra attention so as not to short-circuit the battery.

A
Connect the AC comp onent to the ci rc uit blo ck co ver until a
short ci rcuit occurs to reset the integrated ci rc uit.

Set the movement.Do not press the date dial down when handling the movement.
 Be careful so as not to deform the conducting spring of the movement.


Check that the date
changes correctly. Make sure that the date changes smoothly without dragging.


Set the holding ring
for dial.
When installing the holding ring for dial, be careful so as not to unhook
it.


Set the dial.



Preparation for
installing the hands Follow the instructions below before installing the hands.

It is necessary to adjust the backlash in a certain direction in order to
ensure the proper hand positions before installing the hands.

 Activate the demonstration function.

Press and hold Button B for 3 seconds or longer with the crown at the
normal position.

Adjust the backlash by turning the chronograph minute hand, which is
located at the 6 o’clock position, counterclockwise.
 
 
 

 
 
 


10Set the battery.
Install the battery in the direction shown by the arrow in the illustration below. Installing the
battery from any other angle may result in bending or deforming the battery connection (-).













System Reset
Connect the AC component to the circuit block cover until a short circuit occurs to reset the
integrated circuit.

Be careful so as not to deform the
conducting spring while installing the
battery or movement.

Cal. 7T82A TE C HNICAL GUIDE
20/26
No.

PROCESS

SPECIFICATIONS (QUALITY SPECIFICATIONS,
HANDLING METHODS ETC.)

ILLUSTRATIONS AND SPECIAL INSTRUCTIONS ETC.




(12 o’clock position)

Set the STOPWATCH
1/10-second hand.
Set the STOPWATCH
1/100-second hand.

(9 o’clock position)
Set the small second hand.

Check the hand position and
hand installation height

(6 o’clock position)
Set the STOPWATCH minute
hand.

Check the hand position and
hand installation height.

(Center)
Set the hour hand.
Set the minute hand.

Check the hand position and
hand installation height.

Set the STOPWATCH minute
hand.

Check the hand position and
hand installation height.












T82A 1/–second chronograph
