Seiko 6N23A User manual

PARTS LIST / TECHNICAL GUIDE
ANALOGUE QUARTZ Cal. 6N23A
6N23A
Driving system Step motor (Load compensated driving pulse system type)
Additional function
Normal position Free
1st click position Date setting (counter clockwise), Day settimg(clockwise)
2nd click position Time setting, hand position adjustment / resetting the circuit
Loss/Gain Monthly rate : Less than 15 seconds (at normal temperature range)
Regulation system Nil
Current consumption
Gate time for rate measurement
Coil resistance
Battery No.
Power supply Battery voltage 1.55V
Battery life Approximately 3 years
Jewels
0 jewels
1/13
SEIKO SB-AG SR621SW (Silver oxide battery)
Cal. No.
Item
・Electronic circuit reset switch
・Train wheel setting device
・Day and Date setting
・Battery life indicator
Crown
operation
・Movement: Less than 0.95 μA
・Circuit block: Less than 0.20 μA
Use 10-second gate
*Set the crown at the normal position
4004 317
2.15 - 2.35KΩ
Movement Size
・Outside diameter: φ 18.50 mm
3H - 9H : 16.10
12H - 6H : 18.20
Casing diameter : φ 18.10 mm
3H - 9H : －
12H - 6H : 17.80
・
Height : 3.05 mm
・
3 Hands (Hour, Minute, Second)

Lubricating : Types of oil Oil quantity
AO-3
AO-2
Hour, minute and second hands
Dial
0963 230
Snap for day star
with dial disk
Day star with dial disk
*Refer to the 6 page
for the parts code
0989 011
Intermediate wheel
for day corrector
0808 175
Date dial guard
0962 033
Date dial
Second intermediate wheel *Refer to the 6 page
for calendar corrector
for the parts code
0802 031
0737 012
Date driving wheel Day-Date corrector wheel
0810 890
Date jumper
*Hour wheel
*Refer to the page 6
2/13
PARTS LIST
Cal. 6N23A
Disassembling procedures Figs.
①
→
㉝
Reassembling procedures Figs.
㉝
→
①
①
②
③
⑤
⑥
④
* Oiling position
⑨
⑧
⑩
⑫
⑪
⑦
Normal Quantity
Sufficieet Quantity

Lubricating : Types of oil Oil quantity
AO-3
AO-2
Battery
*Refer to the page 7
0351 332
Winding stem
⑮
0016 121
*Battery connection(+)
*Refer to the page 6
and 7
4216 088
Insulator
*Refer to the page 8
⑱
4270 385
Battery connection(-)
0125 407
Train wheel bridge
*Refer to the page 8
3/13
Screw for
Battery
connection (+)
⑯
* Oiling position
⑲
⑰
PARTS LIST
Cal. 6N23A
⑬
⑭
Normal Quantity
Sufficieet Quantity

Lubricating : Types of oil Oil quantity
AO-3
AO-2
4004 317
Circuit block with coil block
㉑*Fourth wheel and pinion
*Refer to the 6 page
㉓
0701 170
for the parts code
Fifth wheel
and pinion ㉒
0231 066
Third wheel and pinion
4146 126
Step rotor
0033 219
Reset pin
㉗
0806 142
Date corrector wheel
㉘
0391 041
4239 062
Train wheel setting lever
Rotor stator *Refer to the page 8
0281 041
㉙
0033 220
Setting wheel
Pin for setting wheel
*Refer to the page 9
Center wheel and pinion
㉛
0261 291
*Refer to the 6 page Minute wheel and pinion
for the parts code
0282 089
Clutch wheel
4/13
Cal. 6N23A
㉕
㉔
⑳
PARTS LIST
㉝
㉜
* Oiling position
㉖
㉚
*2
*1
Normal Quantity
Sufficieet Quantity

Cal. 6N23A
●Tools and consumables required for disassembling/reassembling
・Movement Holder
UNIVERSAL MOVEMENT HOLDER (S-682)
・Waich oils
SEIKO watch oil AO-2 and AO-3
AO-2 AO-3
5/13
PARTS LIST

Remarks：
□Date dial
□Day star with dial disk
●How to find the correct parts, if not determined by 4 digit caliber number
Please refer to the following table in order to find the correct parts number.
Standard type Long type
Special type
* All parts code are subject to change without notice.
6/13
-
Part code
Positing of
crown
Positing of
date frame
Color of figure
Color of
Background
0148 092
3H
English /
Spanish
Parts name
㉝
0273 017
0273 054
-
0144 102
0144 144
-
⑯
4268 140
4268 141
⑪
Hour wheel
㉑
3H
Fourth wheel and pinion
3H
3H
0878 172
3H
3H
Center wheel and pinion
Positing of
crown
Positing of
date frame
Color of figure
Color of
Background
Battery connection(+)
Part code
0221 061
0221 068
-
English /
Spanish
Sun : Red
Cal. 6N23A
Black
TECHNICAL GUIDE
White
Language
Mon～Sat : Black
White
White
Black
0150 008
3H
3H
Mon～Sat : White
Black
0150 007
Sun : Red

Hands
How to install
Place the movement directly on an universal movement holder
to install the hands.
Battery
How to install battery
Insert the battery aslant in the direction shown by the arrow.
Check the battery connection (+) securely touches the
side of the battery.
Coil block
Correct
Battery connection (+) Battery Main plate
Battery connection (+)
How to install
Set the hook portions (3 places) with tweezers like (Fig.2), and make sure that the
hooks catch the main plate.
In disassembling and reassembling , take care not to deform the hook portions.
Tweezers
Hook portion
Main plate
Hook portion Hook portion
7/13
[ Fig. 1]
[ Fig. 2]
TECHNICAL GUIDE
Cal. 6N23A
①
⑬
⑯
Universal movement holder
REMARKS ON DISASSEMBLING AND REASSEMBLING THE MOVEMENT

Insulator
Setting position
Notes: In order to insulate the battery connection (+) and the battery connection (-),
the insulator should put at the three pins securely as below.
Pin
Insulator
Train wheel bridge
Setting position
Notes: Since the fifth wheel and pinion and step rotor are made of plastic, take care not to
damage them in disassembling and reassembling.
Minute wheel and pinion Fourth wheel and pinion
Pin for setting wheel
Fifth wheel and pinion
Setting wheel Step rotor
Setting wheel
Step rotor Clutch wheel
Third wheel and pinion Minute wheel and pinion
Reset pin
Clutch wheel
Fourth wheel and pinion
Fifth wheel and pinion
Center wheel and pinion
Train wheel setting lever
Setting position
Notes:
・Set the spring part of the train wheel setting lever to the pin as below.
・Take care not to deform the spring part.
Train wheel setting lever
8/13
㉘
TECHNICAL GUIDE
Cal. 6N23A
⑰
⑲
Third wheel and pinion
REMARKS ON DISASSEMBLING AND REASSEMBLING THE MOVEMENT

Cal. 6N23A
Pin for setting wheel
Notes:
・In disassembling and reassembling ，take care not to damage the pin, since it is
made of plastic and easily damaged.
・In disassembling，pick the pin up vertically from the main plate with care.
Pin for setting wheel
Center wheel and pinion
Minute wheel and pinion
・In reassembling，push the pin toward the main plate vertically with care.
Pin for setting wheel
Setting wheel
(fixed to Main late)
Center wheel and pinion
Minute wheel and pinion
9/13
㉙
TECHNICAL GUIDE
Tweezers
REMARKS ON DISASSEMBLING AND REASSEMBLING THE MOVEMENT

TECHNICAL GUIDE Cal. 6N23A
〔STRUCTURE OF THE CIRCUIT BLOCK〕
Notes:
Since the circuit block and coil block are an integrated structure, take care not to cut the coil wire.
while disassembling and reassembling
●Value checking -coil reistance (coil block)
Check the resistance of each coil block if they are within the range in the following table.
CIRCUIT BLOCK (WITH COIL BLOCK) 4004 317 2.15 - 2.35KΩ
10/13
C-MOS-IC
Input terminal(-)
Input terminal(+)
Crystal unit
Coil Block

Cal. 6N23A
●How to measure the current consumption for the whole movement
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 0.95 μ A.
●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 CIRCUIT BLOCK
(please refer to “Structure of the CIRCUIT BLOCK” below).
*
When measuring the current consumption using the SEIKO
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 pattern
of the circuit block.
3.
Make sure the read value is less than 0.20 μ A.
11/13
TECHNICAL GUIDE
REMARKS ON INSPECTION AND MEASUREMENT

TECHNICAL GUIDE Cal. 6N23A
●Water resistance test
Check the water resistance according to the designated specification of the watch
Marking on the case back Test method Applied pressure
WATER RESISTANT(WATER RESIST) 3 BAR
WATER RESIST 5BAR 5 BAR
WATER 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 DIVERIS 300 m
37.5 BAR ＝300(m)times 0.125
He-GAS DIVERIS 600 m
75 BAR ＝600(m)times 0.125
He-GAS DIVERIS1000m
125 BAR ＝1000(m)times 0.125
12/13
Condensation test
Condensation test
Water pressure test
Air leak test
Water pressure test
Condensation test

TECHNICAL GUIDE Cal. 6N23A
Symptom Possible causes Solutions
Movement The watch stops operating. The battery has been depleted.
Measure the bat tery voltage.
Replace the battery with a new
one.
The hour wheel and the pinion of Check the relevant parts, and
the minute wheel are not properly replace the damaged parts with
engaged. (Or the teeth of the hour new ones.
wheel and/or minute wheel have
been broken.)
The hooking por t ions of the Securely attach the hooks of the
circuit block cover a re not circuit block cover to the main
properly engaged, resulting in plate.
poor conductivity.
The coil is broken. Measure the coil block resistance.
Replace the coil with a new one.
One or more wheels have been Remove dirt or dust and clean the
contaminated with dirt, dust or contaminated wheels. Be careful
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 consumption Dirt, dust or foreign particles are Remove dir t, dust or foreign
for the whole movement adhered to the movement. particles and clean the movement.
exceeds the s tandard The driving pulse is generated in If the current consumption for
value. order to compensate the excessive the circuit block alone is within
load applied to the wheels. (The the s tandard value range,
oil has deteriorated, leaked or run overhaul and clean the movement
out.) parts, and then make the
measurement again.
The current consumption The light from out side the Shut out the light, and make the
for the circuit block alone movement is affecting the measurement again.
exceeds the s tandard measurement.
value. There is a defect in the IC Replace the circuit block with a
( integrated circuit ) . new one.
Exterior The crown falls off. The winding stem is not securely Check the main plate, winding
Parts installed. (The setting lever and stem, set ting lever and yoke.
yoke are disengaged.) Replace the defective parts with
new ones.
The current consumption An excessive load is being Adjust or remount the relevant
exceeds the standard value. applied due to friction among hands.
the hour, minute and STOP-
WATCH hands.
Small amount of water/ Water resistance is deteriorated. Investigate the causes to take
blur inside of the glass The watch has been subjected to necessar y measures , whi le
persists. water pressure that exceeds the cleaning inside of the watch.
guaranteed degree.
13/13
TROUBLESHOOTING