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
7
8
9
10
3
4Support for dial side parts screw
6
2/6
11
1
2
5
⇒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
1
89
3
2
7
⇒
3/6
10
19
18
11
12
13
Minute wheel and pinion4
5
6
Battery connection(-)
1⇒21
Fourth wheel and pinion
Third wheel and pinion
Center wheel and pinion
16 Train wheel setting lever
15
17
14
Winding stem
21
20
Main plate
*1
*1
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
3
2
2
2
3
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
T2
OUT1
VSS
P1
P3
XOUT
T4
RESET
P2
P4
VDD
OUT2
T3
XIN
OUT1
OUT2
VSS(-)
VDD (+)
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