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. : ①㉞
Reassembling procedures Figs. : ㉞ ①
AO-2
Types of oil
Oil quantity NORMAL QUANTITY
AO-3
①
HANDS
②DIAL
③
INDICATOR
❹
INDICATOR
0878***
❺
⑥
0595181
⑦
0817181 ❽
0808181
❾
0878***
⑩
⑪
0810890
⑫
0273034
⑬
0802175
❺can
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
TECHNICAL GUIDE Cal. 6N76A
11/18
●Remarks for disassembling and reassembling PIN FOR SETTING WHEEL
Notes: In disassembling and reassembling,take care not to damage the portion that is assembled to
the pin. (The portion that is assembled to the pin is made of plastics and can be damaged easily.)
1) In disassembling, pick up the pin vertically from the main plate with care.
2) In reassembling, push the pin vertically to the main plate with care.
Center wheel and pinion
Minute wheel and pinion
㉚
Setting wheel
Main plate
(The portion that is
assembled to the pin.)
Center wheel and pinion
Minute wheel and pinion
㉚
TECHNICAL GUIDE Cal. 6N76A
12/18
●Remarks for disassembling and reassembling POSITIONING LEVER
Notes: It can be dissassembled and reassembled only at notch on the first date indicator. (It is
impossible to disassemble/reassemble at any other position. )
⑤
TECHNICAL GUIDE Cal. 6N76A
13/18
●How to set the FIRST DATE INDICATOR and the SECOND DATE INDICATOR
①First position at random ②Fir s t da te indic ator p osition
setting: Pull out the crown to
first click and turn the crown to
set day 3 to 1h position and day
③Second date indicator position
se t ting : Rotate it in the
clockwise direction by touching
on its surface with finger until
the two holes overlap.
INDICATOR
1h
①First position at random ②Fir s t da te indic ator p osition
setting: Pull out the crown to
first click and turn the crown to
set day 3 to 7h position and day
5 to 12h position.
③Second date indicator position
se t ting : Rotate it in the
clockwise direction by touching
on its surface with finger until
the two holes overlap.
12h
7h
12h12h
7h
holes overlap
holes overlap
② Second date indicator may only be
rotated in the clockwise direction.
If rotated counterclockwise, it may
cause malfuntion.
Notes:
①Positions to take hold of the movement
NG (12h)
NG (3h)
NG (9h)
OK
OK
OK
OK
INDICATOR
1h
OKNG
INDICATOR
FIRST
INDICATOR
FIRST
INDICATOR
TECHNICAL GUIDE Cal. 6N76A
14/18
REMaRKs oN iNsPEctioN aND MEasUREMENt
1. To measure the current consumption for the whole move-
ment, connect the (-) probe to the battery connection (-)
and (+) probe to the other metal part of the movement,
such as battery clamp or circuit block cover.
* When measuring the current consumption using the
SEIKO digital multi-tester (S-860), use the range of 40 μ
A of SUPPLY V (= 1.55 V) & GATE TIME (2 S).
2. Connect the AC component to the positive terminal for 2
seconds until a short circuit occurs to reset the integrated
circuit.
3. After the integrated circuit is reset, wait approximately for
10 seconds until a stable measurement is obtained, and
then read the measurement.
4. Make sure the read value is less than 0.83 μ A.
●How to measure the current consumption for the whole movement
●How to measure the current consumption for the CIRCUIT BLOCK alone
1. To measure the current consumption for the CIRCUIT
BLOCK alone, connect each probe to the appropriate
positive (+) or negative (-) input terminal of the CIR-
CUIT BLOCK (please refer to “Structure of the CIRCUIT
BLOCK” below).
* When measuring the current consumption using the SEI-
KO Multi-Tester S-860, use the range of 4 μ A of SUPPLY
V (= 1.55 V) & GATE TIME (2 S).
2. Repeat the same procedures as 2. and 3. of measuring
current consumption for the whole movement above.
* When measuring the current consumption for the circuit
block alone, be careful not to damage or deform the pat-
tern of the circuit block.
3. Make sure the read value is less than 0.27 μ A.
TECHNICAL GUIDE Cal. 6N76A
15/18
●Value checking – coil resistance (coil blocks)
Check the resistance of each coil block if they are within the range in the following table.
2 .1 K Ω~ 2.3 KΩ
CIRCUIT BLOCK WITH COIL BLOCK COIL 4004274
[Structure of the CIRCUIT BLOCK]
Input terminal (-)
OUT1
Crystal unit
OUT2
C=MOS=IC
Notes: Since the circuit block and coil block are made by one piece, in disassembling and
reassembling take care not to cut the coil line.
Coil block
Coil resistance can be measured by touching on "OUT 1" and "OUT 2."
TECHNICAL GUIDE Cal. 6N76A
16/18
REMaRKs oN iNsPEctioN aND MEasUREMENt
Operation Function Checkpoint
Pull out the
crown to the 2nd
click and push it
back in to the
normalposition.
Repeat the same
several times.
Setting mechanism
- switching the
function of the time
setting
Make sure that it has
a click at each
position and the
stem is not pulled
off.
Pull out the
crown to the 1st
click, then turn it.
Calendar
mechanism
- correcting the date
(and day), if available
Make sure that the
date (and day)
changes smoothly.
Pull out the
crown to the 2nd
click, then turn it.
Setting mechanism
- hour and minute
hand setting
Make sure that the
hour and minute
hands move
smoothly (without
touching each other
or touching the
surface of the dial or
inside of the glass).
Hands installation
Calendar
mechanism - date
change
Make sure that the
date changes when
the hour and minute
hands pass around
midnight.
●Function check
Note:
TECHNICAL GUIDE Cal. 6N76A
17/18
●
Water resistance test
Check the water resistance according to the designated specification of the watch.
Marking on the case back Test method Applied pressure
3 BAR
5 BAR
10 BAR
15 BAR
20 BAR
18.75 BAR = 150 (m) times 0.125
25 BAR = 200 (m) times 0.125
37.5 BAR = 300 (m) times 0.125
125 BAR = 1000 (m) times 0.125
Air leak test
Condensation test
Condensation test
Water pressure test
Water pressure test
Condensation test
TECHNICAL GUIDE Cal. 6N76A
18/18
Movement
tRoUBlEshootiNG
The watch stops operat-
ing.
The battery has been depleted.
Measure the battery voltage.
Replace the battery with a
new one.
The hour wheel and the pinion
of the minute wheel are not
properly engaged. (Or the teeth
of the hour wheel and/or minute
wheel have been broken.)
Check the relevant parts, and
replace the damaged parts
with new ones.
The hooking portions of the
circuit block cover are not
properly engaged, resulting
in poor conductivity.
Securely attach the hooks of
the circuit block cover to the
main plate.
The coil is broken. Measure the coil block resist-
ance. Replace the coil with a
new one.
One or more wheels have
been contaminated with dirt,
dust or other particles.
An excessive amount of oil in
the movement has caused ad-
hesive forces among the parts.
(wringing)
Remove dirt or dust and clean
the contaminated wheels. Be
careful so as not to damage
the teeth of the plastic parts
while cleaning.
The current consump-
tion for the whole
movement exceeds the
standard value.
Dirt, dust or foreign particles
are adhered to the movement.
Remove dirt, dust or for-
eign particles and clean
the movement.
The driving pulse is generated
in order to compensate the
excessive load applied to the
wheels. (The oil has deterio-
rated, leaked or run out.)
If the current consumption for
the circuit block alone is with-
in the standard value range,
overhaul and clean the move-
ment parts, and then make
the measurement again.
The current consump-
tion for the circuit
block alone exceeds
the standard value.
The light from outside the
movement is affecting the
measurement.
Shut out the light, and make
the measurement again.
There is a defect in the IC
(integrated circuit).
Replace the circuit block with
a new one.
Symptom Possible causes Solutions
The crown falls off. The winding stem is not se-
curely installed. (The setting
lever and yoke are disen-
gaged.)
Check the main plate, wind-
ing stem, setting lever and
yoke. Replace the defective
parts with new ones.
The current consumption
exceeds the standard
value.
An excessive load is be-
ing applied due to friction
among the hour, minute
and second hands.
Small amount of water/
blur inside of the glass
persists.
Water resistance is deterio-
rated. The watch has been
subjected to water pressure
that exceeds the guaranteed
degree.
Investigate the causes to take
necessary measures, while
cleaning inside of the watch.
Adjust or remount the rel-
evant hands.
Exterior
parts
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