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TECHNICAL GUIDE

8T68A

*2

*3

*7

*1

*9

*11

*10

*5

*8

*4

*6

Note

1.How to set the time

1) Pull out the crown to the second click position.
2) Turn the crown to set hour and minute hands.

(Check that AM / PM is set correctly.)

3) Push the crown back into the normal position.

[ Note ]

2.How to set the date

1) Pull out the crown to the first click position.
2) Turn the crown clockwise for date setting.

*Do not set the date between 9:00 P.M. and 3:00 A.M. as this will cause a malfunction.

3) Push the crown back into the normal position.

3.How to reset (after battery change)

It is possible to reset by the following two methods.

1) Set the crown to the normal position.

Method 1

2) Touch the AC terminal of circuit block and the switch spring with conductive tweezers 

 to reset the circuit.

3) The small second hand will move at two-second interval for 10 seconds.

1) Pull out the crown to the second click position.

Method 2

2) Press the button B for two seconds and release the button.
3) Push the crown back to the normal position.
4) The small second hand will move at two-second interval for 10 seconds.

* If the crown is operated within this 10 seconds, the two-second interval movement will not activate.

[ Note ]

It is not necessary to set the chronograph hands after the battery is exchanged. 
If the chronograph hands position are incorrect, following below procedure all the chronograph hands
will be reset to "0" position.

15/19

Button A

(START)

Button A

(STOP)

Button B

(RESET)

If the crown is pulled to the second position while the chronograph is started, the chronograph hands
will continue to move. This is not a malfunction.

*5:

Chronograph minute hand
 (60 minute)

*10:

Crown at first position
 (Date setting)

DISPLAY AND CROWN / BUTTON OPERATION

*1: Hour hand

*6: 24 hour hand

*11:

Crown at second position
 (Time setting)

*4: Small second hand

*7:
*8: Button B  (RESET)
*9: Crown at normal position

Button A  (START / STOP)

*2: Minute hand
*3: Chronograph second hand

Содержание 8T68A

Страница 1: ...umption Coil resistance 4002054 Coil block A 1 45 1 65K 4002055 Coil block B 1 65 1 85K Power Battery No SR936SW Silver oxide battery supply Battery voltage 1 55V Battery life Approximately 3 years Je...

Страница 2: ...ning plate screw 0808 052 Date indicator maintaining plate Date indicator 0810 019 Date jumper 0806 002 Date corrector wheel Cross section 2 19 4 5 6 Intermediate small hour hand wheel and pinion 0817...

Страница 3: ...007 Switch lever holder 4450 018 4450 017 Switch lever B Switch lever A Refer to page 12 for Refer to page 12 for setting position setting position 0962 891 0962 013 3 19 14 Date corrector setting tra...

Страница 4: ...r spring setting position spring setting position 0585 015 0894 002 Hammer Train wheel stop lever Refer to page 10 for Refer to page 12 for oiling spot and page 12 spring setting position for spring s...

Страница 5: ...tion 0012 354 Coil block screw 4002 054 0885 003 Coil block A 4146 063 Step rotor 0886 004 4239 063 Stator A 0886 005 0701 015 Fifth wheel and pinion 5 16 38 39 40 41 34 Minute counter intermediate wh...

Страница 6: ...l Coil block screw 4283 042 4002 055 Coil block B 4146 063 Step rotor 0221 092 4239 064 Stator B 0383 891 0701 015 0384 024 Yoke 0240 019 Seconds wheel 0282 452 Clutch wheel 0962 032 0351 177 Winding...

Страница 7: ...PARTS CATALOGUE 8T68A Tools and consumables required for disassembling reassembling Movement Holder UNIVERSAL MOVEMENT HOLDER S 682 Waich oils SEIKO watch oil AO 2 AO 3 and S 6 AO 2 AO 3 S 6 7 19...

Страница 8: ...68A Remarks Date indicator All parts code are subject to change without notice 8 19 Color of background 3H Black 0878 329 3H White 0878 328 4 5H Parts code Crown position Date position Color of figure...

Страница 9: ...nd pinion 36 Minute counter intermediate wheel and pinion A 35 32 Minute counter intermediate wheel B Seconds counter intermediate wheel and pinion Minute counter intermediate wheel C 33 34 G 32 Minut...

Страница 10: ...There must be oil within the range of the arrow Lower plate for chronograph bridge Note 1 Lubricate on the pointed spot 16 Switch spring Oiling spot and spring setting position are below Chronograph c...

Страница 11: ...trated in the drawing 1 2 Insert the battery sideways as illustrated in the drawing 2 and have the hook of the Switch Spring s Battery Clamp catch the main plate Switch spring Battery clamp 1 Removing...

Страница 12: ...ch lever A and B setting position Switch spring Switch spring Switch lever B Switch lever A Hammer operating lever A Chronograph coupling lever 12 19 Setting position 19 Switch lever B is set between...

Страница 13: ...ble measurement is obtained and then read the measurement 4 Make sure the read value is less than 2 7 A How to measure the current consumption for the CIRCUIT BLOCK alone 1 To measure the current cons...

Страница 14: ...tance coil block Check the resistance of each coil block if they are within the range in the following table COIL BLOCK A 4002054 1 45 1 65K COIL BLOCK B 4002055 1 65 1 85K 14 19 Output terminal Hand...

Страница 15: ...own to the second click position Method 2 2 Press the button B for two seconds and release the button 3 Push the crown back to the normal position 4 The small second hand will move at two second inter...

Страница 16: ...tops after a measurement for 60 minutes Restart in the following procedure During the chronograph operation button B reset can be pushed There is no problem with the function Accumulated elapsed time...

Страница 17: ...RESIST 10BAR 10 BAR WATER RESIST 15BAR 15 BAR WATER RESIST 20BAR 20 BAR SCUBA DIVERIS AIR DIVERIS 150 m 18 75 BAR 150 m times 0 125 SCUBA DIVERIS AIR DIVERIS 200 m 25 BAR 200 m times 0 125 He GAS DIV...

Страница 18: ...other particles so as not to damage the teeth of the plastic parts while cleaning An excessive amount of oil in the movement has caused adhesive forces among the parts wringing The current consumptio...

Страница 19: ...around the Clean the buttons and lubricate normally buttons is insufficient appropriately The circuit block pat tern has Adjust the circuit block pattern been broken or bent or replace the circuit bl...

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