Seiko 4F32A, 8F33A, 8F35A, 8F32A Technical Manual

1

PARTS CATALOGUE / TECHNICAL GUIDE

[SPECIFICATIONS]

Cal. No.

Item

4F32A 8F35A

Movement

8F32A

8F33A

(x 1.0)The illustrations refer to Cal. 8F32A.

Movement
size

ø18.5 mm

17.7 mm x

18.5 mm

ø26.4 mm

25.6 mm x 25.6 mm

ø18.5 mm

17.1 mm x

18.5 mm

ø26.4 mm

24.8 mm x 24.8 mm

Time indication 3 hands (hour, minute and second hands)

Outside diameter

Casing diameter

Height

)

Including the

battery portion

(

3.9 mm 4.3 mm

Driving system

Additional mechanism

Loss/gain Annual rate at 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.

SEIKO CR1612

Battery

Battery No

SEIKOBR2412

Voltage 3.0 V

Battery life Approx. 5 years

Approx. 8 yearsApprox. 10 years

Jewels 4 jewels

Cal. 4F32A, 8F32A
Cal. 8F33A, 8F35A

PARTS CA TALOGUE / TECHNICAL GUIDE (p. 1 – 22)

CATÁLOGO DE PARTES / GUÍA TÉCNICA (p. 23 – 44)

• Step motor (for hour, minute and second hands)

• Ultrasonic motor (for calendar indication)

• Calendar (Leap year indication, month and date)
Perpetual calendar up to February 28, 2100

• Train wheel setting device

• Electronic circuit reset switch

• Battery life indicator

• Day calendar (Cal. 8F33A)

• Instant calendar (day) setting device (Cal. 8F33A)

(Revised: 2008 Apr.)

.

Revision: 2008.4

2

PARTS CATALOGUE

Disassembling procedures Figs. : 1 → 43
Reassembling procedures Figs. : 43 ← 1
Lubricating: Types of oil Oil quantity

Moebius A No

rmal quantity

Moebius F

➡➡

Please see the remarks on the following pages.

Cal. 4F32A, 8F32A, 8F33A, 8F35A

Ex. : Cal. 8F32A

Note for Cal. 8F32A and 8F35A:
When the hands and the dial

are removed, the dial spacer
wi

ll come off if the movement
is turned over. Take care not
to

lose the dial spacer.

0016 704

• Circuit block cover screw (4 pcs.)

•

Train wheel bridge screw (2 pcs.)

00

16 705

•

Ultrasonic motor screw (2 pcs.)

2 Battery

(See the front page)

5 4216 115 (Cal. 4F32A)

4216 117 (Cal. 8F32A,

8F33A and 8F35A)

In

sulator for battery (A)

6 0016 704

Ci

rcuit block cover screw

7

Circuit block cover

8 4003 424 (Cal. 4F32A)

4003 425 (Cal. 8F32A,

8F33A and 8F35A)

Circuit block

10 4281 119

24-hour contact point
spring

11 4270 415

Battery connection (–)

12 4216 116

Insulator for battery (B)

9 4281 115

Date driving contact
po

int spring

*For disassembling and reassembling,

use the movement holder for exclusive

use with the respective calibres.

*For the dial side:

•

Movement holder 4F3-T
for Cal. 4F32A

•

Movement holder 8F3-T

for Cal. 8F32A, 8F33A and 8F35A

*For the case back side:

•Movement holder 4F8F-C
for all Cal. 4F and 8F Series

( + )

( - )

Insulator for battery(B) (white)

2 Battery

5 Insulator 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

battery of the latest model, to which

the insulator for battery (white) is

attached.

3

PARTS CATALOGUE

➡➡

Please see the remarks on the following pages.

Cal. 4F32A, 8F32A, 8F33A, 8F35A

Ex. : Cal. 8F32A

23 4239 115

Rotor stator

24 0261 115 (Cal. 4F32A, 8F32A and 8F33A)

0261 046 (Cal. 8F35A)
Minute wheel and pinion

25 0383 115 (Cal. 4F32A)

0383 116 (Cal. 8F32A, 8F33A and 8F35A)
Setting lever

26 0384 115

Yoke

27 Winding stem

28 0282 032 (Cal. 4F32A and 8F32A)

0282 117 (Cal. 8F33A)
0282 116 (Cal. 8F35A)
Clutch wheel

290962 119 (Cal. 8F33A)

First intermediate wheel for calendar corrector

30 Center wheel and pinion
41 0016 705

Ultrasonic stator unit screw

42 4234 115

Ultrasonic stator unit

43 0100 136 (Cal. 4F32A)

0100 137 (Cal. 8F32A, 8F33A and 8F35A)
Main plate

13 4002 115

Coil block

14 0016 704

Train wheel bridge screw

15 0125 254

Train wheel bridge

16 Fourth wheel and pinion

17 0231 116

Third wheel and pinion

18 0701 115

Fifth wheel and pinion

19 4146 116

Step rotor

20 0281 115

Setting wheel

21 0388 117 (Cal. 4F32A)

0388 116 (Cal. 8F32A, 8F33A and 8F35A)
Yoke guard

22 0391 115

Train wheel setting lever

0282 117•(Cal. 4F32A, 8F32A,

8F33A, 8F35A)
(update: 2007/04/16)

4

PARTS CATALOGUE

➡➡

Please see the remarks on the following pages.

Cal. 4F32A, 8F32A, 8F33A, 8F35A

Cal. 4F32A, 8F32A & 8F35A

Ex. : Cal. 8F32A

Cal. 8F33A

* Cal. 4F32A, 8F32A and 8F35A do not use the parts 3 , 4 , 31 and 37 .

1 4408 116

(Cal. 8F32A and 8F35A)
Dial spacer

32 0808 126

Date dial guard

33 Date dial

34 0810 115

Date jumper

35 Hour wheel
36 0817 118

Intermediate date driving
wheel and pinion

38 4062 117

Ultrasonic rotor

39 1019 114

24-hour wheel

40 0802 115

Date driving wheel

3 0963 230

Snap for day star
with dial disk

4 Day star with

dial disk

32 0808 125

Date dial guard

33 Date dial

31 0989 007

Day corrector
wheel

38 4062 117

Ultrasonic rotor

39 1019 115

24-hour wheel

40 0802 115

Date driving
wheel

36 0817 118

Intermediate date
driving wheel and
pinion

37 0962 118

Second intermediate
wheel for calendar
corrector

35 Hour wheel

34 0810 115

Date jumper

5

PARTS CATALOGUE

Cal. 4F32A, 8F32A, 8F33A, 8F35A

Remarks:

● Back plate

Some models do not use the back plate.

● Case ring

The type of case ring is determined based on the design of cases.
Check the case number and refer to “SEIKO Casing Parts Catalogue” to choose a corresponding case ring.

4 Day star with dial disk (Only for Cal. 8F33A)

Position of crown

and calendar frame

Cal. No. Color of figurePart code

Color of

background

8F33A 0170 072 3 o’clock Black White

The type of day star with dial disk is determined based on the design of cases.
Check the part code printed on the disk.

7 Circuit block cover
16 Fourth wheel and pinion
30 Center wheel and pinion
35 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.

Circuit

block cover

Numeral for

discrimination

Center wheel

and pinion

Fourth wheel

and pinion

Hour wheel

1

4461 021 0221 116 0241 449 0273 118

2

4461 020 0221 114 0241 448 0273 117

[ Cal. 4F32A ]

Numeral for discrimination

6

PARTS CATALOGUE

Cal. 4F32A, 8F32A, 8F33A, 8F35A

[ Cal. 8F32A and 8F33A ]

Numeral for

discrimination

Center wheel

and pinion

Fourth wheel

and pinion

Hour wheel

[ Cal. 8F35A ]

Numeral for

discrimination

2

Center wheel

and pinion

Fourth wheel

and pinion

Hour wheel

0221 123

27 Winding stem 0351 196

The type of winding stem is determined based on the design of cases.

Check the case number and refer to “SEIKO Casing Parts Catalogue” to choose a corresponding
winding

stem.

33 Date dial

Position of crown

and calendar frame

Cal. No. Color of figurePart code

Color of

background

4F32A 0878 321 3 o’clock Black White

8F35A 0878 301 4 o’clock White Black

8F32A
8F33A

0878 301 3 o’clock White Black

The type of date dial is determined based on the design of cases.

Check the case number and refer to “SEIKO Casing Parts Catalogue” to choose a corresponding date
dial.

Circuit

block cover

2

0221 115

4461 022

(8F32A)

4461 024

(8F33A)

0221 114

1

4461 023

(8F32A)

4461 025

(8F33A)

Circuit

block cover

4461 033

0241 446 0273 115

0241 448

0273 116

0241 446

0273 115

(Addition: hand installation height 1, Column of Circuit block cover) 2008.04

(Addition: Column of Circuit block cover) 2008.04

7

TECHNICAL GUIDE

• The explanation here is only for the particular points of Cal. 4F32A, 8F32A, 8F33A and 8F35A.

• For the repairing, checking and measuring procedures, refer to the “TECHNICAL GUIDE, GENERAL

INSTRUCTIONS”.

I. STRUCTURE OF THE CIRCUIT BLOCK

Cal. 4F32A, 8F32A, 8F33A, 8F35A

[ Cal. 4F32A ]

[ Cal. 8F32A, 8F33A and 8F35A ]

“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 terminalInput terminal (+)

C-MOS-IC

Input terminal (–)Crystal unit

8

TECHNICAL GUIDE

II. REMARKS ON DISASSEMBLING AND REASSEMBLING

Cal. 4F32A, 8F32A, 8F33A, 8F35A

● Hour, minute and second hands

• For disassembling and reassembling, use the movement holder for exclusive use with the respective
calibres.

• When installing the hands, place the movement directly on a flat metal plate or a riveting plate.

• How to set the hands

With the battery installed, place the movement directly
on a flat metal plate or a riveting plate, taking care not
to press down the hooking portions.

To install the hands:

Turn the crown clockwise until the date changes, and install the hands so that they point to the 12 o’clock
position.

To install the hands so that the date changes more accurately as the hands indicate 12 o’clock midnight:

1) Turn the crown clockwise until the date changes.

2) Give the crown four counterclockwise turns to make the date return to the previous date.

3) Turn the crown slowly clockwise until the date changes again.

4) Install the hands so that they point to the 12 o’clock position.

• Setting position of the movement on the exclusive movement holder

Check that the pins of the movement holder are securely set to the corresponding holes of the
movement.

[ Movement holder 4F3-T for the dial side of Cal. 4F32A movement ]

[ Movement holder 8F3-T for the dial side of Cal. 8F32A, 8F33A and 8F35A movements ]

Hooking portion

Battery

Pin

Hole to set the pin

Pin

Hole to set the pin

9

TECHNICAL GUIDE

Cal. 4F32A, 8F32A, 8F33A, 8F35A

[ Movement holder 4F8F-C for the case back side of all Cal. 4F and 8F Series movements ]

5 Insulator for battery (A)

• Be sure to complete the battery replacement work within three minutes. Otherwise, the
calendar data stored in the built-in IC will be erased.

• Before removing the old battery, be sure to keep a new battery at hand.

• When installing the new battery, take utmost care not to short-circuit the battery connection

(–)

and the circuit block cover, as this will also erase the calendar data.

• How t

o replace the battery

• How to remove the battery
The ca

se ring has numerals printed on it to show the order of disengaging the hooking portions of

the

circuit block cover using the tips of the tweezers.

12 o’clock
side

Crown side

12 o’clock side

Crown side

Pin

Hole to set the pin

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.

S-912

2 Battery

[ Case ring for Cal. 4F32A ] [ Case ring for Cal. 8F32A, 8F33A and 8F35A ]

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　on　

the seal attached
to the battery with the crown. Then press it towards the portion for a battery check. Be careful not to deform
the p

ortion 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. Af

ter completing the "Necessary procedure after a battery change", turn to “How to input the calendar

data.

”

10

TECHNICAL GUIDE

Cal. 4F32A, 8F32A, 8F33A, 8F35A

[ Cal. 4F32A ]

1. Locate the position where numeral “1” is printed on the case ring, and insert the tips of the
tweezers into the gap between the insulator for battery (A) and the circuit block cover, while
taking care not to damage the coil.

* Take care not to insert the tips of tweezers too deep into the gap as this may damage the coil.

Numeral “2”

Insulator for battery (A)

Tweezers

Circuit block cover

Numeral “1”

Insulator for battery (A)

Circuit block cover

2. Pry with the tweezers to disengage the hooking portion of the circuit block cover.

3. Locate the position where numeral “2” is printed on the case ring, and use the tips of the tweezers
in the same manner as in the steps “1” and “2” above and disengage the hooking portion of the
circuit block cover to remove the battery.

Insulator for battery (A)

Hooking portion of
the circuit block cover

Circuit block cover

Tweezers

Hooking portion of
the circuit block cover

Circuit block cover

Insulator for battery (A)

Tweezers

Tweezers

11

TECHNICAL GUIDE

Cal. 4F32A, 8F32A, 8F33A, 8F35A

[ Cal. 8F32A, 8F33A and 8F35A ]

1. Locate the position where numeral “1” is printed on the case ring, and insert the tips of the
tweezers into the gap between the insulator for battery (A) and the circuit block cover . Then, pry
with tweezers in the direction of the arrow in the illustration below to disengage the hooking
portion of the circuit block cover. While doing so, take care not to damage the coil.

* Take care not to insert the tips of tweezers too deep into the gap as this may damage the coil.

Insulator for battery (A)

2. Locate the position where numeral “2” is printed on the case ring, and insert the tips of the
tweezers into the gap between the insulator for battery (A) and the circuit block cover . Then, pry
with tweezers in the direction of the arrow in the illustration below to remove the battery.

Tweezers

Circuit block cover

Tweezers

Circuit block cover

Hooking portion of

the circuit block cover

Insulator for battery (A)

Insulator for battery (A)

Hooking portion of

the circuit block cover

Circuit block cover Tweezers

Tweezers

Insulator for battery (A)

Hooking portion

of the circuit

block cover

Circuit block cover

12

TECHNICAL GUIDE

Cal. 4F32A, 8F32A, 8F33A, 8F35A

• How to install the battery (For Cal.4F32A, 8F32A, 8F33A and 8F35A)

[A] When the dial and hands are installed, set the time to 6:00 AM or PM.
[B] When the dial and hands are not installed, direct the notched portion of the 24-hour hand toward

the 9 o’clock side.

Note: When installing the battery, take care lest the battery connection (–) should touch the four

hooking portions of the circuit block cover, the grounding portion and the portion for battery
check.

1. Before installing the battery, straighten the three hooking portions of the insulator for battery (A).

Notched portion of 24-hour hand

9 o’clock side

Grounding portion

Hooking portion

Insulator for battery (A)

Portion for battery check

2. First, set a part of the battery into the portion for battery check in the direction indicated by the arrow
1 , and then, press it down to install it completely.

Hooking portion

Portion for battery check

Grounding portion

Note: Set the insulator for battery (A) securely in position, as it easily gets out of position.

1

13

TECHNICAL GUIDE

Cal. 4F32A, 8F32A, 8F33A, 8F35A

• Necessary procedure after battery change

1. After the battery is replaced with a new one, be sure to contact the “AC” terminal of the circuit block
and the (+) surface of the battery with conductive tweezers for more than three seconds, with the
crown at the normal position.

2. Pull out the crown all the way to the second click, and then, push it back in to the normal position.
Repeat this procedure twice.

• If the date dial will not turn, and the second

hand starts moving at 5-second intervals, the
calendar data has been erased.

• If the date dial returns to the current date, and
the second hand starts moving at one-second
intervals, the calendar data is securely retained.

➪

➪

Input the calendar data following the procedure
in “Inputting the calendar data”.

The battery replacement work has been
completed successfully. Next, set the time.

• Inputting the calendar data

• Input each type of calendar data in the following order:

ø

Resetting

the date dial position

Set the date dial to “1”.

Y

Year setting

Set the date dial to

the current year.

M

Month setting

Set the date dial to
the current month.

D

Date setting

Set the date dial to

the current date.

* Be sure to reset the date dial position first.

▲

▲

▲

• Positions of each terminal of the circuit block

[ Cal. 4F32A ] [ Cal. 8F32A, 8F33A and 8F35A ]

Tweezers

“AC”

“D” (Date)

“Y “ (Year)

“M” (Month)

“ø”

“Y “ (Year)

“M” (Month)

“ø”

Tweezers

“AC”

“D” (Date)

■ Basic routine of inputting each type of calendar data

1) Contact the (+) surface of the battery and the terminal of the circuit block (“ø”, “Y”, “M” or “D”) with
conductive tweezers once to activate the mode of inputting the desired type of data to the watch.

2) Contact the (+) surface of the battery and the terminal of the circuit block with tweezers repeatedly
to turn the date dial until the desired numeral appears in the calendar frame. Each contact with the
tweezers advances the date dial by one. It advances one by one and will not be advanced quickly.

14

TECHNICAL GUIDE

Cal. 4F32A, 8F32A, 8F33A, 8F35A

■ Procedure of inputting the calendar data

1. Pull out the crown all the way to the second click.

2. Reset the position of the date dial. (ø)
First, contact the “ø” terminal and the (+) surface of the battery with conductive tweezers to activate the

date dial resetting mode, and then, contact the two portions repeatedly with tweezers until “1” appears
in the calendar frame.

3. Set the year. (Y)
Contact the “Y” terminal and the (+) surface of the battery with conductive tweezers to activate the year

setting mode. “1” appears in the calendar frame. Then, contact the two portions repeatedly with
tweezers until the current year appears in the calendar frame.

Notes:

* The date dial turns back when the numeral returns from “4” to “1” in the calendar frame.
* If any data has already been input before the year setting mode is activated, a numeral other than “1”

may appear in the calendar frame.

Numeral 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

▲

▲

▲

▲

Numeral 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

1997
2001
2005
2009

•

•
2085
2089
2093
2097

1998
2002
2006
2010

•

•
2086
2090
2094
2098

1999
2003
2007
2011

•

•
2087
2091
2095
2099

2000
2004
2008
2012

•

•
2088
2092
2096

Year

4. Set the month. (M)
Contact the “M” terminal and the (+) surface of the battery with conductive tweezers to activate the month

setting mode. “1” appears in the calendar frame. Then, contact the two portions repeatedly with
tweezers until the current month appears in the calendar frame.

Notes:

* The date dial turns back when the numeral returns from “12” to “1” in the calendar frame.
* If any data has already been input before the month setting mode is activated, a numeral other than

“1” may appear in the calendar frame.

Numeral in the
calendar frame:

123456789101112

▲

▲

▲

▲

▲

▲

▲

▲

▲

▲

▲

▲

15

TECHNICAL GUIDE

Cal. 4F32A, 8F32A, 8F33A, 8F35A

5. Set the date. (D)
Contact the “D” terminal and the (+) surface of the battery with conductive tweezers to activate the date

setting mode. “1” appears in the calendar frame. Then, contact the two portions repeatedly with
tweezers until the current date appears in the calendar frame.

Notes:
* The date dial only advances and will not turn back in the date setting mode.
* If any data has already been input before the date setting mode is activated, a numeral other than “1”

may appear in the calendar frame.

● How to check the calendar

Pull out the crown to the first click, and push it back in to the normal position within a second.

* Take care not to pull out the crown all the way to the second click. The calendar cannot be checked.

The calendar will be shown in the frame in the following order.

(1) Year (2) Month (3) Date

▲

▲

(1) The second hand moves at 5-second intervals and stops. The number of seconds it has advanced

indicates the number of years that have passed since the last leap year. Five seconds correspond
to one year.

* Before pulling out the crown to the first click, check and remember where the second hand is so

that you can read how many seconds it has advanced.

* If the second hand has advanced 20 seconds (four times of five seconds), the current year is the

leap year.

Quick movement of

the second hand

Number of years since

the last leap years

5 seconds 10 seconds 15 seconds 20 seconds

1 year 2 years 3 years 4 years (leap year)

(2) After the second hand indicates the number of years since the last leap year, the numeral in the

calendar frame changes to indicate the current month for five seconds.

(3) After the current month is shown, the current date is indicated in the calendar frame.

* When the month and date are represented by the same numeral as in the case of “January 1st”,

“February 2nd” and so on, the numeral in the calendar frame quickly advances and moves back
by one to indicate that the month and date numerals are identical.

(4) After the current date is shown, the second hand quickly moves to catch up with the current second

and starts moving at normal one-second intervals thereafter.

(5) If the calendar is correctly set as you intended, set the desired time.

6. Check if the day dial is reset to “1”.
Contact the “ø” terminal and the (+) surface of the battery with conductive tweezers once to check that

“1” appears in the calendar frame. If not, repeat the procedure again starting from step “2” above.

7. Push back the crown in to the normal position, and check if the number of years since the last leap years,
month and date are correctly set. (See “How to check the calendar” below)

*If the year, month or date is not correctly set, repeat the procedure of inputting the calendar data

starting from step “1”.

16

TECHNICAL GUIDE

Cal. 4F32A, 8F32A, 8F33A, 8F35A

7 Circuit block cover

When setting the circuit block cover, take care not to press down the terminal for battery check and the
ground

ing terminal.

[ Cal

. 4F32A ] [ Cal.

8F32A, 8F33A and 8F35A ]

Terminal for battery check Terminal for battery check

8 Circuit block

Before replacing the circuit block, make sure that the crown is pulled out to the first click.
Also, check that the tip of the reset lever is positioned at the center of the eyehole as shown in the

illustratio

n below, and then, reassemble the circuit block.

Note: When setting the circuit block, take care not to press down on the reset lever.

Grounding terminal

Reset lever terminal

9 Date driving contact point spring

10 24-hour contact point spring

• Setting position

24-hour contact

point spring

4281 119

Date driving contact

point spring

4281 115

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. Handle them with care so as not to bend or straighten
these

parts, as this will cause defective contact with the circuit block, resulting in a malfunction

of th

e ultrasonic motor and defective calendar indication.

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.

17

TECHNICAL GUIDE

Cal. 4F32A, 8F32A, 8F33A, 8F35A

15 Train wheel bridge

• Setting position of wheels

Step rotor

Fifth wheel and pinion

Setting wheel
Minute wheel and pinion

Fourth wheel and pinion

Third wheel and pinion

22 Train wheel setting lever
25 Setting lever
26 Yoke

• Setting position

Train wheel setting lever

Setting lever

Yoke

Note: Take care not to deform the spring portion of the yoke. While the circuit block cover is removed,

do not pull out or push in the crown.

28 Clutch wheel

Install the clutch wheel in such a manner that the gear having smaller
teeth faces toward the center of the center wheel and pinion.

Clutch wheel

31 Day corrector wheel (For Cal. 8F33A)

• How to remove

To remove the day corrector wheel from the second intermediate wheel for calendar corrector, insert
a tip of tweezers into the hole of day corrector wheel as shown in the illustration, and move it toward
the center tube of the movement (in the direction of the arrow in the illustration).

Day corrector wheel

Tip of tweezers

Day corrector
wheel

Clutch wheel
spacer

18

TECHNICAL GUIDE

Cal. 4F32A, 8F32A, 8F33A, 8F35A

32 Date dial guard

• How to remove

1. Lightly lift 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 from the main plate, and
then, remove the date dial guard.

A portion

Protrusion D

Protrusion C

B portion

Protrusion E

Tweezers

Guide pin

Protrusion

Date dial guard

A portion

Note: Take care not to deform the date dial guard, as

it is softly built.

• How to remove the date dial guard in replacing the date dial
(with the parts on the movement side installed)

Be sure to use the movement holder 4F8F-C for
exclusive use for replacing the date dial.

Unlike conventional movements, the date dial guard is not fixed with screws. It is set to the main plate
with the three protrusions, which are caught under the main plate by turning the guard. Then, it is fixed
by the two guide pins.

B portion

• 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 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.

Ultrasonic

rotor pinion

Note: Never remove the date driving wheel and the

24-hour wheel. Otherwise, the date driving
contact point spring and the 24-hour contact
point spring will come off.

24-hour wheel

Date driving

wheel

19

TECHNICAL GUIDE

Cal. 4F32A, 8F32A, 8F33A, 8F35A

36 Intermediate date driving wheel and pinion
38 Ultrasonic rotor
39 24-hour wheel
40 Date driving wheel

• Setting position
(For Cal. 4F32A, 8F32A and 8F35A)

Refer to the illustration at right.

Note: Take care not to damage or deform the pinions of the ultrasonic rotor and date driving wheel in

reassembling and disassembling, as they are made of plastic.

38 Ultrasonic rotor
42 Ultrasonic stator unit

Note: When holding the ultrasonic rotor and ultrasonic stator unit with tweezers, be sure to catch the

portions illustrated below. Otherwise, their functions will be adversely affected.

24-hour wheel

Ultrasonic rotor

Intermediate date driving

wheel and pinion

Date driving wheel

Tweezers

Tweezers

Tweezers

Ultrasonic stator unitUltrasonic rotor

• Setting position
(For Cal. 8F33A)

36 Intermediate date driving wheel and pinion
37 Second intermediate wheel for calendar corrector
38 Ultrasonic rotor
39 24-hour wheel
40 Date driving wheel

Refer to the illustration at right.

Note: Take care not to damage or deform the pinions of the ultrasonic rotor and date driving wheel in

reassembling and disassembling, as they are made of plastic.

Second intermediate
wheel for calendar
corrector

24-hour wheel

Ultrasonic rotor

Intermediate date driving

wheel and pinion

Date driving wheel

20

TECHNICAL GUIDE

Cal. 4F32A, 8F32A, 8F33A, 8F35A

III. VALUE CHECKING

● Coil block resistance

3.6 KΩ ~ 4.0 KΩ

1. Measure the resistance with the coil block installed on the main plate.

2. Apply the red and black probes of the tester to the patterns of the coil lead terminal. While doing so,
take care not to touch the end portion of the coil lead terminal, as this will break the coil wire.

● Current consumption

For the whole movement : Less than 1.3 µA (with voltage of 3.0 V supplied from a battery)
For the circuit block alone : Less than 0.9 µA (with voltage of 3.0 V supplied from a battery)

2. Apply the red and black probes of the tester to the circuit block cover and the pattern of the (–) terminal
of the circuit block, respectively.

3. After connecting the tester, contact the “AC” terminal of the circuit block and the circuit block cover
with conductive tweezers. Then, after approximately 20 seconds, start measurement, checking that
a stable measurement is obtained.

Measuring the coil block resistance

1. Check that the crown is in the normal (pushed in) position.

Measuring the current consumption for the whole movement

Measuring the current consumption for the circuit block alone

1. Connect the tester to the input terminals (+) and (–), and contact the “AC” and (+) terminals with
conductive tweezers. Then, after approximately 10 seconds, start the measurement, checking that
a stable measurement is obtained.

* While measuring current consumption, be sure to protect the circuit block from light with black

cloth or the like, as the light may increase the current consumption, resulting in an inaccurate
measurement.

Note: When the current consumption for the whole movement exceeds the standard value while the

current consumption for the circuit block alone is within the standard value range, a driving pulse
may be generated to compensate for the heavy load applied on the gear train, etc. In that case,
overhaul and clean the movement parts, and then, measure the current consumption for the whole
movement again.

Black probe

Red probe

21

TECHNICAL GUIDE

Cal. 4F32A, 8F32A, 8F33A, 8F35A

● Time accuracy

• The time accuracy measurement should be made in an environment with the temperature at the range
of 23° C ± 2° C and humidity between 50% and 60%.

Normal loss/gain at a normal temperature (23° C) : +0.020 ~ +0.140 sec./day

[A] Check the loss/gain of the watch with the case back closed following the procedure below, and

determine the method of adjustment and repair.

Measuring procedure Measured loss/gain (–/+) Method of adjustment/repair

1 Set the gate of the quartz tester

to “10”.

2 Pull the crown to the second

click to stop the second hand.

3 Place the watch on the

microphone with its 3 o’clock
side up, and read the loss/gain.

Normal : +0.020 ~ +0.140
Defective : –0.012 ~ +0.019

+0.141 ~ +0.204

Defective : –0.013 or smaller

+0.205 or greater

➡

Time accuracy adjustment is
not necessary.

➡

Adjust the time accuracy.

➡

Replace the circuit block with
a new one.

Check the time accuracy.
(Then, adjust the time accuracy.)

➡➡

[B] Time accuracy adjustment by pattern cutting

Cut and remove the overhanging pattern with tweezers to adjust the
time accuracy.

Notes:

* The loss/gain indicated by the tester varies slightly from measurement to measurement. Therefore,

make several measurements to get an average loss/gain.

* When measuring time accuracy, leave the watch untouched for 30 minutes after it is placed on the

microphone. Then, start the measurement.

Notes:

* After cutting the pattern, check that it is completely detached.
* Take care not to let the cut pattern get inside the movement.

Pattern cutting combination and adjustment range

By cutting one or both of the patterns P1 and P2, the loss/gain of
the watch can be adjusted by an amount between –0.064 and
+0.032 sec./day.

: Cut
: Connected

Pattern

P2 P1

Amount of loss/gain

from base accuracy

–0.064
–0.032
+0.032

Note: Once the patterns are cut off, reconnecting them by soldering may not adjust the loss/gain by

the amount specified in the table above and may also change the temperature characteristics
of the watch. Adjust the loss/gain, therefore, only by cutting the patterns.

P2P1

【Supplement】 Time accuracy adjustment by crown operation

(Only recommended to the Service Centers of SEIKO Affiliates and Distributors)

Although time accuracy is normally adjusted by pattern cutting (P.21), in case it cannot be adjusted within the
standard accuracy by this method, please adjust by the crown operation which is shown below:

2) Push back the
crown to the first click
from the second click.
The second hand
starts to move at the
same time.

3) Leave this 2) condition for 5 seconds and then
pull the crown out to the second click again.
(note: The second hand starts to move by the
operation 2), after 5 seconds by the second
hand, then pull the crown out to the second
click.)

1) Pull out the
crown to the
second click.

After you push back the crown to the original position (0 click), the calendar returns to the current date
and the second hand starts to move. (During the time when you are adjusting the accuracy, the watch
has been stopped and the time setting is necessary after the adjustment has finished.)

4) According to the above o perations, the calendar
automatically moves as follows:

① The calendar will move to 8 from the current

date and stops initially.

② Then it automatically moves from 8 to 1 in order.

③ Then it automatically moves from 1 to 15 in order, each date takes 3 seconds to change to the next date.

The dates 1 to 15 correspond to the adjustable seconds in the following table.

Therefore, you have to decide beforehand how many seconds are necessary to adjust.
.

after 5 seconds

Note: Regarding the adjustable
seconds, this is based on
accuracy before adjustment.
The adjustable amount is upto
–0.056, and you cannot increase
it beyond the limit by repeating
the above operations.

④ You choose the date according to the adjustable seconds and push the
crown to the original (0 click) position while the target date is displayed.

eg.) present accuracy: 0.100 seconds/day

When adjusted to be –0.056 seconds/day

Push the crown at the moment when the calendar shows “15”. The accuracy after
the adjustment is about 0.044 seconds/day. If you have not pushed back the crown
at the date which should be done, the calendar changes to 16 after 15 and returns to
the current date.

3 seconds

3 seconds 3 seconds 3 seconds

*

*

21

(supplement)

Cal. 4F32A, 8F32A, 8F33A, 8F35A

22

TECHNICAL GUIDE

Cal. 4F32A, 8F32A, 8F33A, 8F35A

[C] Example of the time accuracy adjustment

Step 1 Measure the loss/gain of the watch with the case back closed.

Obtained loss/gain: +0.180 sec./day

Step 2 Find the amount of deviation from the allowable range of loss/gain between +0.020 and

+0.140 sec./day.

Deviation from the allowable accuracy: +0.180 – (+0.140) = +0.040 sec./day

Step 3 Remove the circuit block and adjust the accuracy.

Find a value of loss/gain from the table above that can offset the deviation obtained
in Step 2 and bring the loss/gain within the allowable range. In this example, –0.064
sec./day is adequate, so cut the pattern P2.

Step 4 Install the circuit block you have adjusted to the movement, and measure the loss/gain of

the watch with the case back closed to check if the obtained loss/gain is within the allowable
range between +0.020 and +0.140 sec./day.

[D] Remarks on measuring the time accuracy

• Measure the loss/gain at a temperature range of 23° C ± 2° C with humidity between 50% and 60%.

• If you hold the watch in your hand for a long time before measuring the accuracy, the temperature

of the watch itself will rise and a stable measurement may not be obtained even in the environment
specified above. In that case, leave the watch untouched in the above environment for a sufficient
period of time, and then, start the measurement.

• Use a quartz tester QT-2100 that can measure a loss/gain up to 0.001 sec./day.

■ Tips on repairing

The following are the troubleshooting guide for the problems particular to Cal. 4F32A, 8F32A, 8F33A and
8F35A.

Problem

The date dial will not
move or the date does
not change properly.

Possible cause

1) Wrong calendar data was input.

2) Defects in the ultrasonic motor

3) Defects in the circuit block and
contact point springs

Remedies

1) Newly input the calendar data.

2) Check the wheels around the ultrasonic
motor.

3) Replace the circuit block, 24-hour
contact point spring and date driving
contact point spring all in a set.

Tips on repairing the perpetual calendar (4F,8F Series)

• Be aware that incorrectly-input calendar data will cause a wrong calendar display.

• For troubleshooting problems with the calendar, refer to the table below.

Symptoms

• The calendar does
not work.

• The second hand
moves at a five­second interval.

Problems

• The battery is running low.

• The insulator for the battery is out of
alignment and the battery has
shorted.

• The battery is not securely set to the
battery holder of the circuit block
cover.

• Problems with parts of the date dial
or the date dial guard, or the date dial
or the date dial guard is incorrectly
mounted.

• The date driving contact point spring
or 24-hour contact point spring is not
contacted with the circuit block.

• The calendar data is incorrectly input.

• The calendar data is incorrectly input.

• The insulator for battery is out of
alignment and the battery is shorted
out.

Solutions

• Replace the battery.

• Set correctly the insulator for the battery.

• Use a new battery with the battery insulator.

• Securely set the battery to the battery
holder of the circuit block cover.

• Check the parts of the date dial or the date
dial guard and replace them with new ones
as necessary or remount them correctly.

• Remove all dust or dirt on contact points of
the date driving contact point spring, 24­hour contact point spring or the circuit
block.

• Replace the date driving contact point spring
or 24-hour contact point spring with new
ones.

• Refer to the technical guide to correctly
input the calendar data.

• Refer to the technical guide to correctly
input the calendar data.

• Set correctly the insulator for battery.

• Use a new battery with battery insulator.

Reference

p.9.10,11

p.9

p.9,10,11

p.18

p.16

p.13-15

p.13-15

p.2

• The calendar
display is wrong.

•A character(s) of
the calendar is out
of the calendar
frame.

• The calendar data is incorrectly input.

• The date driving contact point spring,
24-hour contact point spring or the
circuit block are dirty.

• The date dial or the date dial guard is
incorrectly mounted.

• The date dial or the date dial guard is
deformed or deteriorated.

• The train wheel setting lever is out of
alignment.

• The portion for battery check of the

circuit block cover is deformed.

• Problems with parts of the date dial

or the date dial guard, or the date dial
or the date dial guard is incorrectly
mounted.

• Refer to the technical guide to correctly
input the calendar data.

• Remove all dust or dirt on the contact points
of the date driving contact point spring, 24­hour contact point spring or the circuit block.

• Refer to the technical guide to correctly
remount them.

• Replace the date driving contact point spring
or 24-hour contact point spring with new
ones.

• Check if the train wheel setting lever
operates normally or remount it as
necessary. Note that it must be mounted
with the crown at the first click position.

• Reshape the deformed part. Replace the
circuit block cover with a new one as
necessary.

• Check the parts of the date dial or the date
dial guard and replace them with new ones
as necessary or remount them correctly.

* For troubleshooting of the general defects of conventional quarts watches, refer to the “TECHNICAL

GUIDE, GENERAL INSTRUCTIONS”.

p.13-15

p.16

p.17-18

p.18

p.21

p.16

p.18

23