PARTS CATALOGUE / TECHNICAL GUIDE
[SPECIFICATIONS]
Cal. No.
Item7T62A
Movement
(x 1.0)
Movementsize
ø27.0 mm
Outside diameter
Casing diameter
Cal. 7T62A, 7T92A
ø27.6 mm
Timeindication
Hour, minute and small second hands
Height
Additional mechanism
3.3 mm
Loss/gain Monthly rate at normal temperature range: less than 15 seconds
Regulation system Nil
Measuring gate by quartz tester Use 10-second gate.
Battery
Battery life Approx. 3 years
Battery No.SEIKO SR927W, SONY SR927W,Maxell SR927W, Matsushita SR927W
Voltage 1.55 V
Driving system Step motor (Load compensated driving pulse type, 4 pcs.)
• Electronic circuit reset switch• Train wheel setting device• Date calendar• Instant setting device for date calendar• Battery life indicator
7T92A
The illustrations refer to Cal. 7T62A.
Main time
Minute hand1/5-second hand(Moves at 0.2-second intervals.)Stopwatch
Hour and minute handsSecond hand1/20-second hand(Moves at 0.05-second intervals.)
Hour and minute hands(Minute hand moves at 1-minute intervals.)Alarm
• Stopwatch function· Measures up to 60 minutes in
1/5 second increments.· Accumulated elapsed time
measurement· Split time measurement
• Single-time alarm function
• Stopwatch function· Measures up to 12 hours in
1/20 second increments.· Accumulated elapsed time
measurement· Split time measurement
Jewels 0 jewels
SEIKO SR927SW, SONY SR927SW,Maxell SR927SW, Matsushita SR927SW
2
Cal. 7T62A, 7T92A
Unlike the other Cal. 7T Series watches, which have two crowns and three buttons, Cal. 7T62A and Cal. 7T92A haveone crown and two buttons. But, their basic movement structure is similar in other respects, and the knowledgeand technique you have gained in handling the previous Cal. 7T Sereis watches will come in handy when yourepair Cal. 7T62A/7T92A.
When repairing, however, you are requested to have the full knowledge of the features characteristic of thesewatches and strictly observe the repairing and checking instructions provided in this guide so that the watcheswill be repaired correctly.
As Cal. 7T62A/7T92A has fewer crowns and buttons, the operating procedures for alarm setting (for Cal. 7T62Aonly), time setting and stopwatch hand position adjustment differ from those of the other Cal.7T Series watches.
As a result of this structure change, the battery life of Cal. 7T62A/7T92A has increased by one year to 3 years ascompared with that of the other Cal. 7T series watches.
Measurement performance
Cal. 7T62A : Measures up to 60 minutes in 1/5 second increments.Displays the elapsed time with the stopwatch minute and 1/5-second hands.
Cal. 7T92A : Measures up to 12 hours in 1/20 second increments.Displays the elapsed time with the stopwatch hour, minute, second and 1/5-second hands.
Button operation
Standard Measurement
5 5
FEATURES
Button “A”
Button “B”
Crown
CAL. 7T62A
Button “A”
Button “B”
Crown
1. STOPWATCH FUNCTION
A Start A Stop B Reset
Accumulated Elapsed Time Measurement
A Start A Stop B ResetA Restart A Stop
Split Time Measurement
A Start B Split B ResetB Split release A Stop
Measurement of Two Competitors
A Start B Finish time of1st competitor
B Reset
A 2nd competitorfinishes
B Finish time of2nd competitor
REMARKS ON REPAIRING CAL. 7T62A AND 7T92A
CAL. 7T92A
3
Cal. 7T62A, 7T92A
Single-time alarm: Can be set to ring only once within the coming 12 hours.
Alarm engaged with the crown at the normal position.
Alarm setting operation
2. ALARM FUNCTION (For Cal. 7T62A only)
Crown Pull out tothe 1st click.
B Press to setthe alarm time.
Crown Push back in to thenormal position.
PARTS CATALOGUEDisassembling procedures Figs. : 1 → 55
Reassembling procedures Figs. : 55 → 1
Lubricating: Types of oil Oil quantity
Moebius A Normal quantity
Moebius F Liberal quantity
SEIKO Watch Oil S-6
The illustration refers toboth Cal. 7T62A and 7T92A.
Remarks on removing
the winding stem
To remove the winding stem whentaking out the movement from thecase or while disassembling the partsduring repair work, be sure to pullout the crown to the first click, andthen, remove the winding stem whilepushing the setting lever.
Please see the page shown after the part name.Lubricating of some parts is shown in “III. REMARKS ON DISASSEMBLING AND REASSEMBLING”.
2 0808 580Date dial guard
1 0027 973Pin for date dial guard
3 (0878 527) Date dial
4 0962 580Intermediate wheel forcalendar correction
5 0737 580Date corrector setting wheel
6 0802 580Date driving wheel
7 0271 583Hour wheel for alarm
8 0271 588Hour wheel
pages 8 & 11
The type of the partis determined basedon the case design. page 8
page 11
4
Cal. 7T62A, 7T92A
11 SR927WBatteryThe illustration refers
only to Cal. 7T62A.
0022 230• Battery clamp screw (2 pcs.)
0022 459• Circuit block cover screw (4 pcs.)
(4589 801)Piezoelectric element
Case back
24 0701 580Fifth wheel & pinion
21 0240 580Small second wheel
25 0885 590First intermediate wheelfor second counting
26 0885 591Second intermediate wheelfor second counting
28 0950 590Intermediate minutecounting wheel
29 0902 580Minute counting wheel
32 0261 582Minute wheel for alarm
10 4225 511Battery clamp
9 0022 230Battery clamp screw
13 4457 814Circuit block cover
12 0022 459Circuit block cover screw
14 0396 580Friction spring for second counting
15 4000 517Circuit block
16 4246 700Buzzer lead terminal
17 4270 710Battery connection (–)
18 0027 974Pin for train wheel bridge
20 0888 582Second counting wheel
19 0125 586Train wheel bridge
22 0241 583Fourth wheel & pinion
23 0231 580Third wheel & pinion
27 0261 580Minute wheel
30 0950 590Intermediate alarm wheel
31 0270 582Center wheel for alarm
Cal. 7T62A
Please see the page shown after the part name.Lubricating of some parts is shown in “III. REMARKS ON DISASSEMBLING AND REASSEMBLING”.
page 1
page 11
page 11
page 12
pages 8 & 12
pages 8 & 12
page 13
page 14
page 14
page 14
page 14
page 14
page 14
page 14
page 14
page 14
page 14
page 14
page 14
page 14
5
Cal. 7T62A, 7T92A
The illustration refers only to Cal. 7T62A.
40 4146 710Chronograph rotor for minute
39 4146 710Chronograph rotor for second
46 0282 585Clutch wheel
51 4239 711Rotor stator forchronograph second
34 4002 700Coil block (A)
33 4002 711Coil block for alarm
38 4146 710Step rotor
37 4146 710Alarm rotor
41 4450 703Switch lever (A)
42 0383 592Setting lever
43 0384 582Yoke
44 0281 580Setting wheel
45 0351 583 Winding stem
48 0221 583Center wheel & pinion
47 4283 581Spacer for center wheel& pinion
49 0391 591Train wheel setting lever
50 4239 710Rotor stator
52 4239 712Rotor stator for alarm
53 4239 713Rotor stator for chronograph
54 4450 701Switch lever (B)
36 4002 711Coil block for chronograph
35 4002 700Coil block for chronograph second
55 0100 586Main plate
Cal. 7T62A
Please see the page shown after the part name.Lubricating of some parts is shown in “III. REMARKS ON DISASSEMBLING AND REASSEMBLING”.
The type of the partis determined basedon the case design.
page 8
page 14
page 14
page 14
page 16
page 16
page 16
page 16
page 16
page 16
page 14
page 14
page 14
6
Cal. 7T62A, 7T92A
11 SR927SWBattery
24 0701 580Fifth wheel & pinion
21 0240 580Small second wheel
25 0885 594First intermediate wheelfor second counting
26 0885 595Second intermediate wheelfor second counting
28 0950 590Intermediate wheel forsecond counting (1/20)
29 0902 580Second counting wheel (1/20)
32 0261 582Intermediate wheel forhour counting
10 4225 512Battery clamp
9 0022 230Battery clamp screw
13 4457 814Circuit block cover
12 0022 459Circuit block cover screw
14 0396 580Friction spring for second counting
15 4000 518Circuit block
17 4270 710Battery connection (–)
18 0027 974Pin for train wheel bridge
20 0888 582Second counting wheel
19 0125 586Train wheel bridge
22 0241 583Fourth wheel & pinion
23 0231 580Third wheel & pinion
27 0261 580Minute wheel
30 0950 590Intermediate minute counting
31 0270 582Minute counting wheel
The illustration refersonly to Cal. 7T92A.
0022 230• Battery clamp screw (2 pcs.)
0022 459• Circuit block cover screw (4 pcs.)
Cal. 7T92A
Please see the page shown after the part name.Lubricating of some parts is shown in “III. REMARKS ON DISASSEMBLING AND REASSEMBLING”.
page 1
page 11
page 11
page 12
pages 8 & 12
pages 8 & 12
page 13
page 15
page 15
page 15
page 15
page 15
page 15
page 15
page 15
page 15
page 15
page 15
page 15
page 15
7
Cal. 7T62A, 7T92A
40 4146 710Chronograph rotor forsecond (1/20)
39 4146 710Chronograph rotor for second
46 0282 585Rotor stator forsecond counting (C)
51 4239 711Rotor stator forchronograph second
34 4002 700Coil block (A)
33 4002 711Coil block for chronograph (B)
38 4146 710Step rotor
41 4450 703Switch lever (A)
42 0383 592Setting lever
43 0384 582Yoke
44 0281 580Setting wheel
48 0221 583Center wheel & pinion
47 4283 581Spacer for center wheel& pinion
49 0391 591Train wheel setting lever
50 4239 710Rotor stator
52 4239 712Rotor stator for chronograph (B)
53 4239 713Rotor stator for secondcounting (1/20) (D)
54 4450 701Switch lever (B)
37 4146 710Chronograph rotor for minute
35 4002 700Coil block for second counting (A)
55 0100 586Main plate
36 4002 711Coil block for secondcounting (1/20) (B)
The illustration refers only to Cal. 7T92A.
Cal. 7T92A
Please see the page shown after the part name.Lubricating of some parts is shown in “III. REMARKS ON DISASSEMBLING AND REASSEMBLING”.
45 0351 583 Winding stem
The type of the partis determined basedon the case design.
page 8
page 15
page 15
page 15
page 16
page 16
page 16
page 16
page 16
page 16
page 15
page 15
page 15
8
Cal. 7T62A, 7T92A
Remarks:
The types of the parts are determined based on the design of cases. Check the case number, and refer to“Casing Parts Catalogue” to choose corresponding parts.
The circuit blocks of Cal. 7T62A and 7T92A have a hole for discrimination as shown in the illustrations below.
* The holes for discrimination are intended to discriminate between the circuit blocks for Cal. 7T62A andCal. 7T92A only.
CAL. 7T62A
Holding ring for dial 0866 650
3 Date dial 0878 527
45 Winding stem 0351 583
1 Pin for date dial guard 0027 973
18 Pin for train wheel bridge 0027 974
15 Circuit block
CAL. 7T92A
• Point of distinction
[Pin for date dial guard] [Pin for train wheel bridge]
HoleNo hole
9
Cal. 7T62A, 7T92A
• The explanation here is only for the particular points of Cal. 7T62A and 7T92A.
• For the repairing, checking and measuring procedures, refer to the “TECHNICAL GUIDE, GENERALINSTRUCTIONS”.
Input terminal (+)
Output terminal
Input terminal (–)
Crystal unit
C-MOS-IC
Upconverter coil(only for Cal. 7T62A)
Output terminal
Output terminal
TECHNICAL GUIDE
I. STRUCTURE OF THE CIRCUIT BLOCK
II. NECESSARY PROCEDURE AFTER BATTERY CHANGE
After installing the battery, set the time and reset the stopwatch hands to the “0” position following theprocedure below.
5 5
Button “A”
Button “B”
Crown
Button “A”
Button “B”
Crown
Crown Pull out to the 2nd click when the small second hand is at the 12 o’clock position.
Crown Turn to set the time hands to the current time.* Check that AM/PM is correctly set.
B
CAL. 7T62A
Press to set the alarm hands to thecurrent time.
A Press for 2 seconds.
* The stopwatch 1/20 second hand turns a fullcircle.
A Press for 2 seconds.* The stopwatch minute hand turns a full circle.
B Press to set the stopwatch 1/20
second hand to the “0” position.
CAL. 7T62A CAL. 7T92A
CAL. 7T92A
10
Cal. 7T62A, 7T92A
B Press to set the stopwatch minute
hand to the “0” position.
A Press for 2 seconds.
* The stopwatch second hand turns a full circle.
A Press for 2 seconds.
* The stopwatch 1/5 second hand turns a fullcircle.
B Press to set the stopwatch 1/5 secondhand to the “0” position.
B Press to set the stopwatch secondhand to the “0” position.
A Press for 2 seconds.
* The stopwatch hour and minute hands turn afull circle.
B Press to set the stopwatch hour and
minute hands to the “0” position.
Crown Push back in to the normal position in accordance with a time signal.
Pressing Button “A” for 2 seconds can resume the procedure again as indicated by the arrow if necessary.
III. REMARKS ON DISASSEMBLING AND REASSEMBLING
The hour wheel is made of engineering plastics. When pulling out the hour hand, take care not to damagethe hour wheel.
1) Pull out the crown with winding stem to the second click. Then, turn the crown clockwise to turn thetime hands also clockwise.
2) Stop turning the hands when the date changes to the next.
3) Install the small second, hour and minute hands so that they point exactly to the 12 o’clock position.
4) Install the stopwatch hands so that they point exactly to the “0” position of the stopwatch scale.
When disassembling the dial, take care not to bend the dial leg. Raise the portions around the dial leg byturns gradually to remove the dial.
• Caution for disassembling
• How to install
* After installing the hands, be sure to check that they move smoothly without interfering with oneanother.
• Caution for disassembling
Hands
Dial
11
Cal. 7T62A, 7T92A
Turn the pin 90° counterclockwise to loosen thepin.
Set the pin securely into the groove. Then, turnit 90° clockwise to fix the pin.
Notes:
* Do not turn the pin more than 90° in either direction.
* Do not turn the pin forcibly.
When installing the hour wheel, check that it engages with the pinion of the minute wheel.
When installing the battery clamp, set it securely to the two hooking portions of the movement.
1) Loosen the four circuit block cover screws.
2) Release the four hooking portions of the circuitblock cover. (Indicated by the arrows in theillustration at right)
1 Pin for date dial guard
8 Hour wheel
10 Battery clamp
13 Circuit block cover
• How to remove • How to install
• Lubricating
Lubricate the wheel edge of both the date drivingwheel and date dial.
• How to remove
Moebius A
Screw
Screw
Screw
Protruded portion
Guide post
12
Cal. 7T62A, 7T92A
“b” portion
“a” portion
1) Have the four hooking portions of the circuitblock cover (indicated by the arrows in theillustration at right) catch the movement securely.In doing so, check if the circuit block is set properlyto guide posts “a” and “b”, and reset it in positionif necessary.
2) Tighten the four circuit block cover screws. Whentightening the screws, take care not to cut the coil.
To set the friction spring for second counting, slip itinto the gap under the train wheel bridge.
The circuit block is fixed to the train wheel bridge withthe guide pins (“a”, “b”, “c”, “d” and “e” in theillustration shown at right). When removing thecircuit block from the guide pins, take care not todamage the circuit block.
a
e
b
c
d
Have the guide holes of the circuit block (“a”, “b”, “c”,“d” and “e” portions in the illustration) securelycaught by the guide pins of the train wheel bridge andthe guide tubes of the main plate.
Turn the pin 90° counterclockwise with a screwdriverto loosen the pin.
Set the pin in the direction as shown at right. Then,turn it 90° clockwise with a screwdriver to fix the pin.
14 Friction spring for second counting
15 Circuit block
18 Pin for train wheel bridge
• How to install
• Setting position
• Caution for disassembling
• How to install
• How to remove
• How to install Pin for trainwheel bridge
13
Cal. 7T62A, 7T92A
After installing the pin, lubricate the upper pivot of thefollowing parts:
• Chronograph rotor for second, chronograph rotorfor minute, alarm rotor and step rotor (for Cal.7T62A)
Chronograph rotor for second (1/20), chronographrotor for second, chronograph rotor for minute andstep rotor (for Cal. 7T92A)
• Minute wheel
• Small second wheel
• Minute counting wheel (for Cal. 7T62A)
Second counting wheel (1/20) (for Cal. 7T92A)
• Minute wheel for alarm (for Cal. 7T62A)
Minute counting wheel (1/20) (for Cal. 7T92A)
Before installing the train wheel bridge, carefully check the setting positions of the wheels and rotors. Besure to check that each rotor has a lower pivot attached securely.
If the wheels and rotors are all set in position with the winding stem with crown at the first click, the
train wheel bridge can be installed smoothly. There is no need to press down the train wheel bridge.
If the train wheel bridge will not be seated in position smoothly, the other parts must be set in the wrongposition. Check their setting positions.
Notes:
* Intermediate minute counting wheel and intermediate alarm wheel can be used interchangeably.
* The following four rotors for each calibre can be used interchangeably:
• Chronograph rotor for second • Chronograph rotor for minute • Alarm rotor and • Step rotor
• Chronograph rotor for second (1/20) • Chronograph rotor for second • Chronograph rotor for minute and • Step rotor
19 Train wheel bridge
Wheels and pinions
CAL. 7T62A CAL. 7T92A
• Lubricating
• How to install
Moebius A
Moebius F
See the illustration on the next page.
• Setting position
14
Cal. 7T62A, 7T92A
25 0885 590First intermediate wheelfor second counting
26 0885 591Second intermediatewheel for secondcounting
28 0950 590Intermediate minutecounting wheel
29 0902 580Minute counting wheel
47 4283 581Spacer for center wheel& pinion
27 0261 580Minute wheel
32 0261 582Minute wheel for alarm
37 4146 710Alarm rotor
30 0950 590Intermediate alarm wheel
31 0270 582Center wheel for alarm
22 0241 583Fourth wheel & pinion
38 4146 710Step rotor
24 0701 580Fifth wheel & pinion
21 0240 580Small second wheel
39 4146 710Chronograph rotor forsecond
40 4146 710Chronograph rotor forminute
44 0281 580Setting wheel
23 0231 580Third wheel & pinion
20 0888 582Second counting wheel
The illustrations refer only to Cal. 7T62A.
15
Cal. 7T62A, 7T92A
25 0885 594First intermediate wheelfor second counting
26 0885 595Second intermediatewheel for secondcounting
28 0950 590Intermediate wheel forsecond counting (1/20)
29 0902 580Second counting wheel(1/20)
47 4283 581Spacer for center wheel& pinion
27 0261 580Minute wheel
32 0261 582Intermediate wheel forhour counting
37 4146 710Chronograph rotor forminute
30 0950 590Intermediate minutecounting
31 0270 582Minute counting wheel
22 0241 583Fourth wheel & pinion
38 4146 710Step rotor
24 0701 580Fifth wheel & pinion
21 0240 580Small second wheel
39 4146 710Chronograph rotor forsecond
40 4146 710Chronograph rotor forsecond (1/20)
44 0281 580Setting wheel
23 0231 580Third wheel & pinion
20 0888 582Second counting wheel
The illustrations refer only to Cal. 7T92A.
16
Cal. 7T62A, 7T92A
Switch lever (A)
Winding stem
IV. VALUE CHECKING
Coil block resistance
Coil block (A)
Coil block for chronograph second
Coil block for chronograph minute (Cal. 7T62A)Coil block for second counting (1/20) (Cal. 7T92A)
Coil block for alarm (Cal. 7T62A)Coil block for chronograph (Cal. 7T92A)
1.70 KΩ ~ 2.60 KΩ
1.70 KΩ ~ 2.60 KΩ
1.80 KΩ ~ 2.40 KΩ
1.80 KΩ ~ 2.40 KΩ
Upconverter coil resistance : 150 Ω ~ 180 Ω
41 Switch lever (A)
42 Setting lever
43 Yoke
49 Train wheel setting lever
48 Center wheel and pinion
55 Main plate
• Setting position and lubricating
• Lubricating
• Lubricating
Moebius A
SEIKO Watch Oil S-6
Switch lever axlefor switch lever (B)
Moebius A
Moebius F
SEIKO Watch Oil S-6
Moebius A
Train wheel setting lever
Yoke
Setting lever
17
Cal. 7T62A, 7T92A
Current consumption
For the whole movement Less than 1.10 µA (with 1.55 V supplied from a battery)(when the stopwatch is not used)
For the circuit block alone Less than 0.20 µA (with 1.55 V supplied from a battery)
When measuring the current consumption with SEIKO Multi-Tester S-860, select the measurement range asfollows:
For the whole movement Use the range of 40 µA of SUPPLY V (= 1.55 V) & GATE TIME (2 S)
For the circuit block alone Use the range of 4 µA of SUPPLY V (= 1.55 V) & GATE TIME (2 S)
V. FUNCTION CHECKING
Follow the procedure in “II. NECESSARY PROCEDURE AFTER BATTERY CHANGE” to set the time handsand reset the stopwatch hands to the “0” position.
TIME SETTING AND STOPWACTH HAND POSITION ADJUSTMENT
* Before checking the stopwatch function, reset the stopwatch hands to the “0” position following theprocedure in “II. NECESSARY PROCEDURE AFTER BATTERY CHANGE”.
* Check that the crown is at the normal position. Otherwise, the stopwatch operation cannot be made.
STOPWACTH FUNCTION
1. Checking for Standard Measurement / Accumulated Elapsed Time Measurement
A Press repeatedly to check if the stop-watch 1/5 second hand starts andstops with each press.
Check if the stopwatch minute handstarts moving as the accumulatedelapsed time exceeds one minute.
A Press to stop the measurement.
B Press to check if all the stopwatch
hands return to the “0” position.
A Press repeatedly to check if the stop-watch 1/20 second hand starts andstops with each press.
Check if the stopwatch hour andminute hands start moving as theaccumulated elapsed time exceeds oneminute.
A Press to stop the measurement.
B Press to check if all the stopwatch
hands return to the “0” position.
2. Checking for Split Time Measurement
A Press to start the measurement.
B Press to check if the stopwatch hands stop to indicate the split time.
B Press to check if the split time is released and if the hands move quickly to indicate the elapsed time.
B Press repeatedly to check if the split time is measured and released with each press.
A Press to stop the measurement.
B Press to check if all the stopwatch hands return to the “0” position.
CAL. 7T62A CAL. 7T92A
18
Cal. 7T62A, 7T92A
Note for the stopwatch 1/20 second hand for Cal. 7T92A:
* After the stopwatch is started, the stopwatch 1/20-second hand automatically stops and stays at the “0”position if the measurement exceeds 10 minutes. When the measurement is stopped or split time ismeasured, it moves to indicate the elapsed 1/20 seconds.Also, after the stopwatch is restarted or split time is released, the stopwatch 1/20-second handautomatically stops and stays at the “0” position if the measurement exceeds 10 minutes.
* Before checking the alarm function, set the time and alarm hands to the current time following theprocedure in “II. NECESSARY PROCEDURE AFTER BATTERY CHANGE”.
ALARM FUNCTION (Only for Cal. 7T62A)
1. Alarm Time Setting
B Press repeatedly to set the alarm hands.
* With each press, they move one minute. They move quickly if the button is kept pressed. They stop as they reach thecurrent time. Release and press the button, and the hands will start moving again.
Crown Pull out to the 1st click.
2. Alarm Engagement
Crown Push back in to the normal position.* At the designated alarm time the alarm rings for 20 seconds and stops. To stop it manually, press button “A” or
“B”.* After the alarm rings, the alarm minute hand starts moving at one-minute intervals as the alarm hands indicate
the current time.
3. To Cancel or Readjust the Designated Alarm Time
B To cancel: Press repeatedly to set the alarm hands to the desired alarm time.
To readjust: Press repeatedly to set the alarm hands to the desired alarm time.
Crown Pull out to the 1st click.
Crown Push back in to the normal position.
* Printed on recycled paper. 2002-2 Printed in Japan