Seiko 4F56A Quick start guide

1
PARTS CATALOGUE /TECHNICAL GUIDE
Cal. 4F56A, 8F56A, 8F58A
[SPECIFICATIONS]
Cal. No.
Item 4F56A 8F58A
Movement
8F56A
(x 1.0)The illustrations refer to Cal. 8F56A.
Movement
size ø18.5 x 17.7 (3H - 9H) x
18.5 (12H - 6H) ø26.4 x 25.6 (3H - 9H) x 25.6 (12H - 6H)
17.1 (3H - 9H) 24.8 (3H - 9H) x 24.8 (12H - 6H)
Time indication 3 hands (hour, minute and second hands) + 24-hour hand
Outside diameter
Casing diameter
Height )
Including the
battery portion
(4.8 4.8
Driving system
Additional mechanism
Loss/gain Annual rate within normal temperature range: less than 20 seconds
Regulation system Logical regulation (Pattern cutting system: 3 steps)
Measuring gate by quartz tester Use 10-second gate.
CR1612
Battery Battery No. BR2412
Voltage 3.0 V
Battery life Approx. 5 years Approx. 8 yearsApprox. 10 years
Jewels 4 jewels
•Step motor (for 24-hour, hour, minute and second hands)
•Ultrasonic motor (for calendar indication)
•Calendar (Leap year indication, month and date)
Perpetual calendar up to February 28, 2100
•Independent adjustment of hour hand
• Train wheel setting device
•Electronic circuit reset switch
•Battery life indicator

2
Disassembling procedures Figs.: 1 fi49
Reassembling procedures Figs.: 49 ‹1
Lubricating: Types of oil Oil quantity
Moebius A Normal quantity
Moebius V
Moebius F
PARTS CATALOGUE Cal. 4F56A, 8F56A, 8F58A
2Dial
124-hour, Hour, Minute and
second hands
3Holding ring for dial
0884 167 (4F56A)
0884 166 (8F56A,8F58A)
Please see the remarks on the following pages.
Ex. : Cal. 8F56A
Cal. 4F56A, 8F56A & 8F58A

3
( + )
Please see the remarks on the following pages.
0016 704
• Circuit block cover screw (4 pcs.)
•Train wheel bridge screw (2 pcs.)
0016 705
•Ultrasonic motor screw (2 pcs.)
PARTS CATALOGUE Cal. 4F56A, 8F56A, 8F58A
8Circuit block
4003 424 (4F56A)
4003 091 (8F56A,8F58A)
9Date driving
contact point spring
4281 115
10 24-hour contact point spring
4281 119
11 Battery connection (–)
4270 415
12 Insulator for battery (B)
4216 116
13 Coil block
4002 115
4Battery
6Circuit block cover screw
0016 704
7Circuit block cover
5Insulator for battery (A)
2Battery
5Insulator for battery (A)
A battery with 5 Insulator for
battery (A) (red) may be installed in
some models. Discard this type of
battery after replacing it with a new
batteryofthelatestmodel,towhich
the insulator for battery (white) is
attached.
Note Pull out the crown to the first click before starting disassembling or reassembling.
It is highly recommended that the exclusive
movement holder (S-680) be used for
disassembly or reassembly. Contact SEIKO
SERVICE CENTER to purchase this tool.
4Battery
For removing or installing the
batteryandinputtingcalendardata,
refer to page 11 to 16.
Ex. : Cal. 8F56A
Cal. 4F56A, 8F56A & 8F58A
( - )
Insulator for battery(B) (white)

4
15 24-hour clutch wheel
0273 113
14 Date dial guard 0808 127
17 Date dial
0012 354
Date jumper screw ( 4 pcs. )
16 Dial Washer
0491 016
18 Hour wheel
0273 114
19 Intermediate 24-hour driving
wheel and pinion
0817 117
20 Third intermediate wheel for
hour corrector
0168 014
21 Date jumper screw
0012 354
22 Date jumper
0810 116
23 Calender Plate
0195 014
24 Second intermediate wheel for
hour corrector
0168 013
25 Intermediate date driving wheel
and pinion
0817 118
26 Bush for second intermediate wheel
for hour corrector guide
4247 018
27 Ultrasonic rotor
4062 117
29 Date driving wheel
0802 116
28 24-hour wheel
1019 114
PARTS CATALOGUE Cal. 4F56A, 8F56A, 8F58A
Please see the remarks on the following pages.
Ex. : Cal. 8F56A
Cal. 4F56A, 8F56A & 8F58A
Note Never remove the 24-hour
wheel and date driving wheel
while working on the date dial
replacement(without
disassembling the train wheel
side), as the date driving
contact point spring and 24-
hour contact point spring may
drop off.

5
49 Main plate
0100 148 (4F56A)
0100 138 (8F56A,8F58A)
30 Train wheel bridge screw
0016 704
31 Train wheel bridge
0125 254
32 Fourth wheel and pinion
33 Third wheel and pinion
0231 116
34 Fifth wheel and pinion
0701 116
35 Rotor
4146 116
36 Setting wheel
0281 115
37 Yoke guard
0388 116
38 Train wheel setting lever
0391 115
39 Stator
4239 115
40 Minute wheel and pinion
0261 048 (4F56,8F56A)
0261 049 (8F58A)
41 Setting lever
0383 115 (4F56A)
0383 116 (8F56A,8F58A)
43 Setting stem
44 Clutch wheel
0282 117
45 First intermediate wheel for hour
corrector
0168 011
47 Ultrasonic stator unit screw
0016 705
48 Ultrasonic stator unit
4234 115
42 Yoke
0384 116
46 Center wheel and pinion
Ex. : Cal. 8F56A
Cal. 4F56A, 8F56A & 8F58A
Please see the remarks on the following pages.
PARTS CATALOGUE Cal. 4F56A, 8F56A, 8F58A

6
0221 122 0241 167 0273 114
2
24461 034
0221 122 0241 167 0273 114
4F56A
8F56A
4461 026
PARTS CATALOGUE Cal. 4F56A, 8F56A, 8F58A
Circuit
block cover Center wheel and
pinion Fourth wheel and pinion Hour wheel
Circuit
block cover Center wheel and
pinion Fourth wheel and pinion Hour wheel
Remarks
●Back plate
For some models which use the back plate, refer
to the illustration at the right to mount it.
●Case ring
The type of case ring is determined based on the
case design.
Check the case number and refer to “SEIKO
CasingPartsCatalogue”tochoosetheappropriate
case ring.
7Circuit block cover
32 Fourth wheel and pinion
46 Center wheel and pinion
18 Hour wheel
•Discrimination of the hand installation height
Cal. 4F and 8F Series watches have numerals printed on
movement to indicate the hand installation height. When
repairing, refer to the table below.
Align the indicator to the
setting stem.
Numeral for discrimination
Numeral for
discrimination
Numeral for
discrimination

7
0221 124 0241 167 0273 114
2
8F58A
4461 035
Circuit
block cover Center wheel and
pinion Fourth wheel and pinion Hour wheel
17 Date dial
Cal. No. Part code Position of crown and
calendar frame Color of figure Color of
background
4F56A
8F56A
8F58A
0878 320
0878 356
3 o'clock
3 o'clock
Black
Black
White
White
PARTS CATALOGUE Cal. 4F56A, 8F56A, 8F58A
The type of date dial is determined based on the case design.
* Not all the types of date dial are shown in the table above.
Checkthe casenumber andrefer to“SEIKO CasingParts Catalogue”to choosethe appropriatedate dial.
43 Setting stem 0351 196
The type of setting stem is determined based on the case design.
Check the case number and refer to “SEIKO Casing Parts Catalogue” to choose the appropriate setting
stem.
Numeral for
discrimination

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TECHNICAL GUIDE Cal. 4F56A, 8F56A, 8F58A
• The explanation here is only for the particular points of Cal. 4F56A, 8F56A and 8F58A.
• For repairing, checking or measuring procedures, refer to the “TECHNICAL GUIDE, GENERAL
INSTRUCTIONS”.
I. STRUCTURE OF THE CIRCUIT BLOCK
[ Cal. 4F56A ]
[ Cal. 8F56A, 8F58A ]
“ø” terminal
(for resetting the date dial)
“M” terminal (for month setting) “Y” terminal (for year setting)
“D” terminal
(for date setting)
AC terminal
Coil block output terminal
Input terminal (+)
C-MOS-IC
Input terminal (–)
Crystal unit
“ø” terminal
(for resetting
the date dial)
“M” terminal (for month setting)
“D” terminal
(for date setting)
AC terminal
“Y” terminal
(for year setting)
Coil block output terminal
Input terminal (+)
C-MOS-IC
Input terminal (–)
Crystal unit

9
II. REMARKS ON DISASSEMBLING AND REASSEMBLING
TECHNICAL GUIDE Cal. 4F56A, 8F56A, 8F58A
It is highly recommended that the exclusive movement holder (S-680) be used to disassemble or
reassemble the watch.
Use of other movement holders may make unreliable the screw pins (the gold part) of the main plate.
Be careful not to press the main plate too hard when screwing or unscrewing the pins.
To prevent deformation of the main plate, never use the movement holder which is designed to hold
the movement with only two side guides.
◆How to use the exclusive movement holder
Setting stem guide
A portion
129 B portion
30 49
[ Cal. 8F Series]
Disassembling/reassembling procedures :
Disassembling/reassembling procedures :
«
«
Setting stem guide
A portion
Disassembling/reassembling procedures : 129 B portion
30 49
[ Cal. 4F Series ]
Disassembling/reassembling procedures :
«
«

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Hooking portion Battery
1 24-hour, hour, minute and second hands
Always set the hands with the battery installed.
Set the movement to the A portion of the exclusive movement holder.
If any other movement holder is used, be certain to place the movement on a secure, flat plate. Pay special
attention not to damage the hooking portion.
1. Set 4 Battery. (Refer to page 12.)
2. Set 3 Holding ring for dial.
3. Set 2 Dial.
4. Go to "Necessary procedure after a battery change".
*Refer to page 12 for details.
5. Input the calendar data.
*Refer to page 13 to 16 for details.
To set the hands more accurately,
1) Turn the crown clockwise until the date changes.
2) Give the crown four counterclockwise turns until the previous date appears.
3) Slowly turn the crown clockwise until the date changes again.
4) Set the hands to point at the 12 o’clock position.
Installation of the hands
Turn the crown clockwise until the date changes, then set the hands to point at the 12 o’clock position.
◆How to set the hands
TECHNICAL GUIDE Cal. 4F56A, 8F56A, 8F58A

11
S-912
Insertion point 2
TECHNICAL GUIDE Cal. 4F56A, 8F56A, 8F58A
4Battery
◆How to remove the battery
1. Insert the tip of the tweezers into the gap between the battery and the circuit block cover at the insertion
point 1 in the illustrations below to gently lift up the battery.
2. Insert the tip of the tweezers into the gap between the battery and the circuit block cover at the insertion
point 2 in the illustrations below to gently lift up the battery.
3. Remove the battery with due care not to damage the coil.
The illustrations below show the new battery installed. (The battery is a new model with the new white
battery insulator.) (In a case where the red insulator is installed, insert the tweezers between the red insulator
and the circuit block cover in the order of the numbers illustrated below.) Take care not to insert the tweezers
too deep into the gap as this may damage the coil.
It is highly recommended that the exclusive tool (S-912) be used for removing or
installing the battery, resetting the built-in IC or inputting the calendar data.
Contact SEIKO SERVICE CENTER to purchase this exclusive tool.
Insertion point 1
Insertion point 1 Insertion point 2
[ Cal. 4F56A ]
[ Cal. 8F56A, 8F58A ]

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Grounding portion
Portion for battery check
B
R
2
4
1
2
◆How to install the battery
1. In a case where a red battery insulator is installed, remove and discard it.
2. To install a new battery with a battery insulator, align the tip of the arrow mark onthesealattached
tothe batterywith thecrown. Thenpress ittowards theportion fora batterycheck. Be careful not to deform
the portion for battery check.
*Make sure that the battery is securely fixed by the four hooking portions.
3. After the battery is installed, turn to the "Necessary procedure after a battery change".
4. After completing the "Necessary procedure after a battery change", turn to “How to input the calendar
data.”
AC Terminal
Battery
Circuit Block
AC Terminal
AC Terminal
◆Necessary procedure after a battery change
1. After the battery is replaced with a new one, push the crown back to its normal position.
2. Contact the “AC” terminal of the circuit block and the (+) surface of the battery with a S-912 tool or
conductive tweezers for more than three seconds to reactivate the built-in IC.
Be careful not to damage the circuit block. (To prevent any damage to the circuit block, it is highly
recommended the exclusive tool S-912 be used .)
Reactivate the built-in IC by contacting the AC
terminal and the side face of the battery with the
tip of the tool.
[ Position of AC terminal of
Cal. 8F (Gent's) Series ] [ Position of AC terminal of Cal. 4F (Ladies') Series ]
➔
TECHNICAL GUIDE Cal. 4F56A, 8F56A, 8F58A

13
■
TECHNICAL GUIDE Cal. 4F56A, 8F56A, 8F58A
◆How to input the calendar data
AHow to check the calendar data (after battery change)
1. Pull out the crown to the first (or the second) click, then
immediately push it back to its original position.
Gently support the battery with fingers and securely hold
the movement.
2. Check the movement of the second hand and follow the flowchart below.
If the second hand shows neither one-second interval movement nor five-second interval movement,
return to the "Necessary procedure after a battery change" followed by A. How to check the calendar data
(after battery change).
Five-second interval movement
2
➟
➟
One-second
interval
movement
C.
How to check
the Calendar
Data
B.
How to input
the calendar
data
Five-second
interval
movement
The data is correct.
The data is wrong.
One-second interval movement :
The data is retained securely.
Go to C. How to check the calendar data.
Five-second interval movement :
The data has been erased.
Go to B. How to input the calendar data.
Complete.

14
■
BHow to input the calendar data
B
R
2
4
1
2
C
R
1
6
1
2
ØØ
Year
Month AC
Date
Month
Year AC
Date
[ Position of the terminals of Cal. 4F (Ladies') Series ]
[ Position of the terminals of Cal. 8F (Gent's) Series ]
To input the calendar data, activate the circuit by
contacting each terminal and the side face of the battery
repeatedly with tweezers. Be careful not to damage the
circuit block. Battery
Circuit Block
1. Pull out the crown to the second click.
2. Contact the “Ø “ terminal with the tip of tweezers until “1” appears
in the calendar frame.
1
[8F]
[4F]
Ø
Ø
TECHNICAL GUIDE Cal. 4F56A, 8F56A, 8F58A
Ø Y M D
•Input each calendar data item in the following order.
Resetting
the date dial position
Set the date dial to “1”.
Year setting
Set the date dial to
the current year.
Month setting
Set the date dial to
the current month.
Date setting
Set the date dial to
the current date.

15
3. Contact the “Y” terminal with the tip of tweezers until the year
number representing the current year appears in the calendar frame.
(Refer to the table below for the year number.)
TECHNICAL GUIDE Cal. 4F56A, 8F56A, 8F58A
4. Contact the “M” terminal with the tip of tweezers until the current
month appears in the calendar frame.
5. Contact the “D” terminal with the tip of tweezers until the current
date appears in the calendar frame.
2
[8F]
[4F]
Y
Y
[8F]
[4F]
M
M
7
[Ex. : July]
[8F]
[4F]
12
[Ex. : 12th.]
D
D
1
[8F]
[4F]
Ø
Ø
6. Contact the “Ø “ terminal with the tip of tweezers once to check if “1”
appears in the calendar frame.
If “1” does not appear in the calendar frame, redo the whole
procedures from 1 to 6 once again.
7. Push the crown back to its original position.
For the year number which represent the current year in the calendar frame, refer to the table below.
Year number in the calendar frame
1234
One year since
the last leap year Two years since the last leap year Three years since the last leap year Leap year
2001
2005
2009
•
•
2002
2006
2010
•
•
2003
2007
2011
•
•
2004
2008
2012
•
•
Year

16
12
7
Year
Month Ex.: July
Ex.: 12th.
Ex.: July 12, 2002
Pull out the crown to the first click, then immediately push it back to its original position. Gently support the
battery with fingers to securely hold the movement.
Each calendar data item will be shown in the following order.
TECHNICAL GUIDE Cal. 4F56A, 8F56A, 8F58A
■
CHow to check the calendar data (After inputting the data)
The number of times that the second hand moves in five-second
intervals indicates the number of the year which has passed since
the last leap year.
Ex. Year 2002:
The year number 2 ; the second hand moves twice in five-second
intervals.
The current month will be displayed for a while in the calendar
frame.
If all the data items are correct, proceed to the time setting.
When setting the time, make sure that AM/PM is properly set.
Note
This watch does not feature an Automatic Calendar Function.
Date is interlocked to the movement of the hands.
Be certain that AM/PM is properly set when setting the time to prevent the wrong date from appearing.
If any data item is not correct, return to B. How to input the calendar data and repeat the whole procedures
once again.
Date Subsequently the current date will be displayed in the calendar
frame.

17
Guide pin B
Guide pin A
TECHNICAL GUIDE Cal. 4F56A, 8F56A, 8F58A
Positions to insert tweezers
7Circuit block cover
Reassembling :
When setting the circuit block cover, take care not to deform the terminal for battery check.
Terminal for battery check Terminal for battery check
8Circuit block
Disassembling :
Insert tweezers from the positions indicated in the illustration below to remove the circuit block.
Reassembling :
Locate the circuit block using the guide pin A on the coil side. Then gently press down the guide pin B
under the 24-hour wheel to fix the circuit block.
When mounting the circuit block, make sure that the date driving contact point spring and 24-hour contact
point spring are correctly mounted and that the tip of the reset lever is positioned at the center of the
eyehole as shown in the illustration below.
Tip of the reset lever terminal
(Center of the eyehole)
Eyehole
Note Pull out the crown to the first click before starting disassembling or reassembling.
[ Cal. 4F56A ] [ Cal. 8F56A, 8F58A ]

18
Note The date driving contact spring and the 24-hour contact point spring contact with the circuit block to
drive and control the ultrasonic motor. Failure of this electric contact will cause a malfunction of the
ultrasonic motor or defective calendar display. To guard against this problem, carefully handle the
contact point springs not to bend or straighten them.
To prevent a problem caused by deformation of the springs, it is recommended that the springs be
replaced with new ones at the time of disassembling or reassembling.
10 24-hour contact point spring
9Date driving contact point spring
Date driving contact point spring 24-hour contact point spring
•How to remove
1. Gently lift up the A portion of the date dial guard with
tweezers to clear it from the guide pin, and then, move it in
the clockwise direction until it gets on the guide pin.
2. Release the B portion of the date dial guard in the same
manner as you release the A portion, and then, move it in
the clockwise direction until it gets on the guide pin.
3. Check that all the three protrusions of the date dial guard
have come off the main plate. Then, remove the date dial
guard.
14 Date dial guard D portion
Guide pin
Date dial guard
B portion
C portion
A portion
E portion
Guide pin
Date dial guard
Date dial guard
TECHNICAL GUIDE Cal. 4F56A, 8F56A, 8F58A
•Setting position
Unlike conventional movements, the date dial guard is not fixed
withscrews. It issetto themain plate withthe threeprotrusions,
which are caught under the main plate by turning the guard.
Then, it is fixed by the two guide pins.
Note Take care not to deform the date dial guard, as it is
softly built.

19
•How to install
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 the right.
2. Move protrusion D of the date dial guard in the
counterclockwise direction so that it is caught under
the main plate.
3. Slightly move protrusions C and E in the
counterclockwise direction alternately to set them
under the main plate. While doing so, set the A and
B portions of the date dial guard to the guide pins.
Note Take care not to press down the ultrasonic rotor
pinion while installing the date dial guard.
B portion
Protrusion C
A portion
Protrusion E
Protrusion D
Ultrasonic rotor pinion
TECHNICAL GUIDE Cal. 4F56A, 8F56A, 8F58A
18 Hour wheel
Lubricating hole
Caution must be taken not to
spill oil inside.
Caution must be taken not to
spill oil over the wheel.
Refer to the illustration below for lubricating.

20
25 Intermediate date driving wheel and pinion
27 Ultrasonic rotor
28 24-hour wheel
29 Date driving wheel
•Setting position
Refer to the illustration at the right.
Note The pinions of the ultrasonic rotor and date driving wheel are made of plastic. Be careful not
to damage or deform them while working on reassembling or disassembling.
Date driving wheel
24-hour wheel
Ultrasonic rotor
Intermediate date driving
wheel and pinion
Note When holding the ultrasonic rotor and ultrasonic stator unit with tweezers, be sure to catch the
portions illustrated below. Failure to do so may adversely affect their functions.
27 Ultrasonic rotor 48 Ultrasonic stator unit
Ultrasonic rotor Ultrasonic stator unit
Tweezers
Tweezers
TECHNICAL GUIDE Cal. 4F56A, 8F56A, 8F58A
Do not touch here.
Keep this side away from dust or dirt.