Seiko 6G27A Quick start guide

[SPECIFICATIONS]

Cal. No.

Item

Original

First click

Movement

Total height 3.45mm

Time indication 2 hands (hour, minute)

Movement size

(mm)

Outside diameter Ф23.7mm

Casing diameter Ф23.3mm

Number of jewels Nil

Measuring gate by quartz tester 10-second gate

SR626SW (Silver oxide battery)

1.55V

Approx. 3 years

PARTS CATALOGUE / TECHNICALGUIDE

Cal. 6G27A

6G27A

Accuracy Less than 15 seconds: Monthly rate at normal temperature range

Step motor

Crown Operation ●Free

●Tiime setting (turn clockwise to move forward and counterclockwise to move back）

Additional mechanism

●24 cities (12H)

Loss/gain Nil

Driving system

Battery

Battery No.

Voltage

Battery life

●Second setting device

●Electronic circuit reset switch

PARTS CATALOGUE Cal.6G27A

Disassembling procedures Figs. Lubricating : Types of oil Oil quantity

Reassembling procedures Figs. Moebius A (AO-3) Normal quantity

Moebius Ｆ(AO-2)

Hour , Minute hands

Small second , 24Hour hands

Dial

0022 247

0604 173

Support for dial side parts

0802 469

Day driving wheel

0125 369

Small second wheel bridge

0491 014

0240 169 Dial washer

Small second wheel

11 0273 169(Normal) 0157 169

0273 170(Long) Small hour hand wheel

Hour wheel

4Support for dial side parts screw

2/6

⇒1

1⇒11

0100 469

Main plate

PARTS CATALOGUE Cal.6G27A

Disassembling procedures Figs. Lubricating : Types of oil Oil quantity

Reassembling procedures Figs. Moebius A (AO-3) Normal quantity

Moebius Ｆ(AO-2)

*Refer to the 10pages for the each parts code

Battery 0012 168

Battery connection (+) screw 4004 162

Circuit block (with coil block)

4271 407(Normal)

4271 408(Long)

Battery connection(+)

0281 452 4455 169

Setting wheel Reset lever

0261 451 0241 471

4216 169

Insulator 0231 457

4146 170

0221 069(Normal) Step rotor

4270 469 0221 070(Long)

4239 169

Stator

0391 169

0125 469

Train wheel bridge 0701 452

Fifth wheel and pinion *Setting lever

0384 452

Yoke

0282 452

Clutch wheel

0351 177

121

⇒

3/6

Minute wheel and pinion4

Battery connection(-)

1⇒21

Fourth wheel and pinion

Third wheel and pinion

Center wheel and pinion

16 Train wheel setting lever

Winding stem

Main plate

REMARKS

●Discrimination of the hand installation height

Cal.6G27A watch has numerals printed on the dial and the movement to indicate the installation

heights. When repairing, refer to the table below.

Number for

Discrimination

PARTS CATALOGUE Cal.6G27A

0273 1700221 070 4271 408

0221 069 0273 169 4271 407

Battery connection (+)

4/6

Center wheel and pinion Hour wheel

1113 3

TECHNICAL GUIDE

Cal.6G27A

Ⅰ

. Remarks on disassembling and assembling

(1)Winding stem

・How to remove

While pushing the indented portion of the arrow pull out

the winding stem.

(2)Battery

・How to install

Insert the battery aslant in the direction shown by the arrow.

Check the battery connection (+) securely touches the

side face of the battery.

（3）Insulator

Notes

：

To insulate between the battery connection (+) Insulator

and the battery connection (-), the insulator

should put at the three pin securely as bellow. Pin

5/6

Push

Ⅱ. VALUE CHECKING

● Coil block resistance (see illustation below) 1.7 - 1.9 µO

Patterns Locations For Circuit Block (with Coil Block)

＊Measure registance of the coil block : Contact OUT 1 & OUT 2

＊Measure the current consumption for the circuit block alone : Contact VDD(+) & VSS(-)

Less than 0.27 µA

For the circuit block alone

(see illustration below)

Less than 1.18 µA

Contact OUT 1 & OUT 2

(see illustration below)

Contact VDD(+) & VSS(-)

(see illustration below)

TECHNICAL GUIDE Cal.6G27A

6/6

●Current consumption circuit block

For the whole movement

OUT1

VSS

XOUT

RESET

VDD

OUT2

XIN

OUT1

OUT2

VSS(-)

VDD (+)

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