Seiko 6N76A Quick start guide

PARTS CATALOGUE /TECHNICAL GUIDE
Cal. 6N76A
[SPECIFICATIONS]
Cal. No.
Item
Interval of hands movement
Driving system
Additional function
Loss/gain
Regulation system
Gate time for rate measurement
Power
supply
Battery No.
Battery voltage
Battery life
Number of jewels
1/18
Crown
operation
Normal position
1st click position
2nd click position
Current consumption
Coil resistance
1 second
0 jewel
Stepping motor, 1 piece
 
 
 
4004274 (CIRCUIT BLOCK WITH COIL BLOCK)
2.1 - 2.3 KΩ
Use 10-second gate.

Nil
1.55 V
Approx. 3 years
6N76A
 
small second hand)
 
Free
Date setting(clockwise)
Time setting, hand position adjustment / resetting the circuit
Monthly rate: Less than 20 seconds (worn on the wrist at the tempera-
ture between 5 and 35)
 
   
  
Movement: Less than 0.83 μA
Circuit block: Less than 0.27 μA

SPECIFICATIONS
2/18
Cal. 6N76A

Date calendar. The date frame has been enlarged compared to those from existing calibers, increasing the
legibility and practicality.

●The units digits and the tens digits are displayed in two separate indicator windows.
●Compared to date frame of the existing calibers, it is enlarged by about twice the original.
Cal. 6N76A
Basic calibers 
FEATURES

PARTS LIST Cal. 6N76A
3/18
For parts ❹and ❾
For parts ❺, please refer to page 12.
For parts ❽, please refer to page 7 and 8.
Disassembling procedures Figs. : ①㉞
Reassembling procedures Figs. : ㉞ ①
AO-2
Types of oil
Oil quantity NORMAL QUANTITY
AO-3
①
HANDS
②DIAL
③
INDICATOR
 
❹
INDICATOR
0878***
❺
 
⑥
0595181
⑦

0817181 ❽
0808181
❾
0878***
⑩

 
⑪
0810890
⑫
0273034
⑬
0802175
❺can
be dissassembled and
reassembled only at notch on
the first date indicator. Please
refer to page 12.

Cal. 6N76A
PARTS LIST
4/18
Picture after ⓱BAT TERY
CONNECTION (+) is installed.
*1 Oiling position *2 Oiling position
For parts ⓮, please refer to page 8.
For parts ⓱and ⓲, please refer to page 9.
For parts , ⓴and 󱣆, please refer to page 10.
For parts 󱣇, please refer to page 11.
*1
*2
⓮ BAT TERY
⑮WINDING STEM 0351001
⑯BATTERY CONNECTION (+) SCREW
0016121
⓱ BATTERY CONNECTION (+)
4268066
⓲INSULATOR
4216088
⑲ BATTERY CONNECTION (-)
4270385
⓴TRAIN WHEEL BRIDGE
0125297
㉑CIRCUIT BLOCK WITH COIL BLOCK
4004274
㉒FOURTH WHEEL AND PINION
0144151
㉓THIRD WHEEL AND PINION
0231056
㉔ FIFTH WHEEL AND PINION
0701170 ㉕RESET PIN
0033219
㉖STEP ROTOR
4146126
㉗ROTOR STATOR
4239062
㉘FIRST INTERMEDIATE WHEEL
FOR CALENDAR
0962175
󱣆TRAIN WHEEL SETTING LEVER
0391041
󱣇PIN FOR SETTING WHEEL
0033220
㉜MINUTE WHEEL AND PINION
0261291
㉝CLUTCH WHEEL
0282087
㉛SETTING WHEEL
0281041
㉞CENTER WHEEL AND PINION
0221074

PARTS LIST Cal. 6N76A
5/18
●Tools and consumables required for disassembling/reassembling
• MOVEMENT HOLDER
 
• Watch oils
 
AO-3
AO-2

TECHNICAL GUIDE Cal. 6N76A
6/18
●How to find the correct parts, if not determined by 4 digit caliber number


⑨      
④     
Parts Code
Position of Date Frame ⑨ ④
 0878123 0878127
12H 0878125 0878178
Please refer to the following table in order to find the correct part number of each date indicator
according to the position of date frame.

TECHNICAL GUIDE Cal. 6N76A
7/18

(refer to the picture on the right) in order to

pull out the crown with the stem completely.
REMaRKs oN DisassEMBliNG aND REassEMBliNG thE MoVEMENt
●How to remove the SETTING STEM before dismantling the movement
Crown position: normal (=0) position. A
●How to remove the DATE DIAL GUARD
1) Lightly lift the A portion of the date dial
       
guide pin, and then move it in the clockwise
direction until it gets off the guide pin.
2) Release the B portion of the date dial guard
in the same way as described above, and
then move it in the clockwise direction until
it gets off the guide pin.
3) Check that all three protrusions of the date
dial guard have come off from the main
plate, and then remove the date dial guard.
The date dial guard has three protrusions to be caught under the main plate, and it is also fixed by
two guide pins.
⑧
Protrusion B portion
A portion
UP

Date dial guard
Guide pin

TECHNICAL GUIDE Cal. 6N76A
8/18
●How to install the DATE DIAL GUARD
1) Put the date dial guard on the main plate so
that the A and B portions are over the guide
pins, as shown in the illustrations at right.
2) Move the protrusion D of the date dial
guard in the counterclockwise direction so
that it is caught under the main plate.
3) Slightly move the protrusions C and E in
the counterclockwise direction alternately
to set them under the main plate. Then, set
the A and B portions of the date dial guard
to the guide pins.
4) Check that the date dial guard is fixed
securely to the main plate.
⑧DATE DIAL GUARD
Protrusion D
B PortionProtrusion C
Protrusion E A Portion
●How to install the BATTERY
Insert the battery aslant in the direction shown by the arrow. Check that the battery connection (+)
securely touches the side face of the battery.
Coil block
Main plate
⑰BATTERY CONNECTION (+)
Make sure the side of the battery touches
the Battery Connection (+)
Battery Connection (+)
Battery
Side view

TECHNICAL GUIDE Cal. 6N76A
9/18
●Remarks for installing the BATTERY CONNECTION (+)
Set it so that the hook portions (3 places) catch the main plate (Fig.1&2).
In disassembling and reassembling, take care not to deform the hook portions.

plate.
[Fig.1]
[Fig.2]
Hook portion
Hook portion
Main plate
Hook portion

●Remarks for setting position of the INSULATOR

should be set securely with the three pins as bellow.
Pin
⑱INSULATOR

TECHNICAL GUIDE Cal. 6N76A
10/18
●Remarks for setting position of the TRAIN WHEEL BRIDGE
Notes: Since the fifth wheel and pinion and step rotor are made of plastic, take care not to damage
them in disassembling and reassembling.
Third wheel and pinion Minute wheel and pinion
Setting wheel
Clutch wheel
Fourth wheel and pinion
Fifth wheel and pinion
Step rotor
Clutch wheel
Fourth wheel and pinion
Fifth wheel and pinion
Step rotor
Pin for setting wheel
Setting wheel
Third wheel and pinion
Minute wheel and pinion
Reset pin
Center wheel and pinion
●Remarks for setting position of the TRAIN WHEEL SETTING LEVER
Notes:
 
 
㉙