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)

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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.

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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

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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

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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