Seiko 5M42A Guía de inicio rápido

Movement size

The illustrations refer to Cal. 5M42A. (x 1.0)

Movement

Item

[SPECIFICATIONS]

Cal. 5M42A

Cal. 5M43A

PARTS CATALOGUE /TECHNICAL GUIDE

4.3 mmHeight

Casing diameter ø27.0 mm

Capacitor voltage: 0.5 ~ 2.3V

From 1.55V to stoppage: Approx. 168 hours

Cal. No. 5M42A 5M43A

Outside diameter ø27.6 mm

3 hands

Time indication

Step motor (Load compensated driving pulse type)

Driving system

Monthly rate at normal temperature range: less than 15 seconds

Loss/gain

NilRegulation system

Use 10-second gate.

Measuring gate by quartz tester

Automatic generating systemPower generator

Polyacene lithium condenserCapacitor

Power supply

Operating voltage range

Duration of charge

6 jewelsJewels

•Automatic generating system

•Power reserve indicator

•Overcharge prevention function

•Electronic circuit reset switch

•Train wheel setting device

•Date calendar

•Day calendar (for Cal. 5M43A only)

•Instant setting device for date calendar

•Instant setting device for day calendar (for Cal. 5M43A only)

Additional mechanism

Disassembling procedures Figs. : 1 →52

Reassembling procedures Figs. : 52 →1

Lubricating: Types of oil Oil quantity

Moebius A Normal quantity

SEIKO Watch Oil S-6

Ex.: Cal. 5M43A

Cal. 5M42A, 5M43A

➡➡Please see the remarks on the following pages.

PARTS CATALOGUE

0022 247

•Date dial guard screw (3 pcs.)

•Capacitor clamp screw (2 pcs.)

•Circuit block cover screw (2 pcs.)

•Oscillating weight bridge screw (2 pcs.)

•Coil block screw (1 pc.)

•Train wheel bridge screw (1 pc.)

0022 490

•Oscillating weight screw (1 pc.)

1 Hour, minute and second hands

15 0271 670

Hour wheel

Anti-magnetic shield plate

(The anti-magnetic shield plate is

welded to the main plate, and

they cannot be disassembled.)

14 0816 670

Date driving wheel

12 0962 670

Intermediate wheel for calendar correction

13 0810 660

Date jumper

11 0737 670

Day corrector setting wheel

10 Date dial

9 0808 660

Date dial guard

7 0989 660

Intermediate wheel for day correction

(Only for Cal. 5M43A)

8 0022 247

Date dial guard screw

6 Day star with dial disk

(Only for Cal. 5M43A)

5 0963 781

Snap for day star with dial disk

(Only for Cal. 5M43A)

4 0491 589

Dial washer

3 Holding ring for dial

2 Dial

PARTS CATALOGUE Cal. 5M42A, 5M43A

➡➡Please see the remarks on the following pages.

23 0022 247

Circuit block cover screw

33 4002 516

Coil block

32 0022 247

Coil block screw

31 4239 519

Generating stator

30 4146 518

Generating rotor

29 1002 660

Intermediate wheel for generating rotor

28 4002 519

Generating coil block

27 0198 660

Oscillating weight bridge

26 0022 247

Oscillating weight bridge screw

25 4000 731

Circuit block

24 4457 761

Circuit block cover

16 0022 490

Oscillating weight screw

17 0500 660

Oscillating weight

18 1002 662

Oscillating weight wheel

19 0022 247

Capacitor clamp screw

20 4225 518

Capacitor clamp

21 4216 509

Insulator for capacitor

22 3029 113

Capacitor unit









SET CODE

Rechargeable battery

3023 5MZ

PARTS CATALOGUE Cal. 5M42A, 5M43A

➡➡Please see the remarks on the following pages.

52 0100 659 (One-piece case type)

0100 669 (Conventional case)

Main plate

50 Winding stem

51 0221 676

Center wheel and pinion

49 0282 672

Clutch wheel

48 4239 518

Rotor stator

47 0397 660

Lever for unlocking stem

(Only for one-piece case

type)

46 0383 662

Setting lever

45 0384 661

Yoke

44 4450 730

Switch lever

43 0281 670

Setting wheel

42 0261 670

Minute wheel

41 4146 531

Step rotor

40 0701 670

Fifth wheel and pinion

39 0231 530

Third wheel and pinion

38 0241 670

Fourth wheel and pinion

37 4271 515

Capacitor connection (+)

36 0391 660

Train wheel setting lever

35 0125 660

Train wheel bridge

34 0022 247

Train wheel bridge screw

PARTS CATALOGUE Cal. 5M42A, 5M43A

3 Holding ring for dial

Remarks:

The type of holding ring for dial is determined based on the design of cases. Check the case number and

refer to “SEIKO Casing Parts Catalogue” to choose a corresponding holding ring for dial.

6 Day star with dial disk (Only for Cal. 5M43A)

Position of crown

and

calendar frame

0150 661 English ↔Spanish 3 o’clock Black White

LanguagePart code Color of figure Color of background

The type of day star with dial disk is determined based on the design of cases. If any other type of day

star with dial disk is required, please specify the number inscribed on the disk.

10 Date dial

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.

Position of crown

and

calendar frame

Cal. No. Part code Color of figure Color of background

5M42A 0878 729 3 o’clock Black White

5M43A 0878 675 3 o’clock Black White

Cal. 5M42A, 5M43A

TECHNICAL GUIDE

•The explanation here is only for the particular points of Cal. 5M42A and 5M43A.

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

INSTRUCTIONS”.

•How to install

Place the movement directly on the riveting plate shown in the illustration with the oscillating weight side

down, so that the oscillating weight screw is not damaged. Then, press in the hands.

C-MOS-IC

I. STRUCTURE OF THE CIRCUIT BLOCK

II. REMARKS ON DISASSEMBLING AND REASSEMBLING

1 Hands

Automatic generating input terminal

Output terminal

Crystal unit

Input terminal (–)

Input terminal (+)

TECHNICAL GUIDE Cal. 5M42A, 5M43A

3 Holding ring for dial

If the watch is of the one-piece case type, the movement is

fixed to the case in such a manner that the four hooking

portions of the holding ring for dial catch the case.

•How to remove

1) While pushing the lever for unlocking stem with

tweezers, pull out the winding stem.

2) Push the protrusions of the four hooking portions

toward the center of the dial with a screwdriver as

shown in the illustration to release them from the

case.

3) Insert the tip of tweezers into each of the grooves of

the holding ring for dial positioned at 1, 5 and 9

o'clock sides, and pry the ring up to remove the

movement.

•How to install

Set the movement level into the case, and push the

hooking portions of the holding ring for dial with a

screwdriver until they catch the case.

Note: Check that each of the four hooking portions

catches the case securely, and then, tighten the

eccentric posts to fix the dial.

Holding ring for dial

Casing spring

Case

Bezel

Lever for unlocking stem

Note: Two eccentric posts are used to fix the dial to the

main plate. To remove the dial, loosen them.

TECHNICAL GUIDE Cal. 5M42A, 5M43A

16 Oscillating weight screw

Tighten the oscillating weight screw very firmly, applying

more force than usual.

•Though the capacitor unit for Cal. 5M4 Series is of a completely different type than that for Cal. 5M2 Series,

they have a close resemblance in shape. To prevent confusion between them, the capacitor unit for Cal.

5M4 Series has two holes for discrimination on its lead terminal portion. When replacing the capacitor

unit, check for the holes to make sure you are using the proper one.

•Be sure to observe the correct polarity of the capacitor unit. The lead terminal side is the (–) side as shown

in the illustration.

•To install the capacitor unit, set the “A” portion to the hole of the main plate, and then push the “B” portion

so that it is fixed in position.

22 Capacitor unit

Note: Handle the capacitor unit with care so as not to short-circuit its (+) and (-) terminals.

24 Circuit block cover

The circuit block cover we are supplying has no calibre

number nor numeral printed on it for discriminating the

hand installation height.

Oscillating weight screw

Capacitor connection (+)

Capacitor lead terminal

Main plate

Hole for discrimination

TECHNICAL GUIDE Cal. 5M42A, 5M43A

26 Oscillating weight bridge screw

27 Oscillating weight bridge

•Before tightening the oscillating weight bridge screw,

check that the upper pivot of the generating rotor is

inserted properly.

•Be sure to lubricate the upper and lower pivots of the

generating rotor and intermediate wheel for generating

rotor in the quantity specified in the illustration.

Oscillating weight bridge

Generating rotor

Intermediate wheel for generating rotor

•Be sure to lubricate the ball-bearing of the oscillating

weight bridge as shown in the illustration.

29 Intermediate wheel for generating rotor

•Lubricating

Refer to the illustration at right.

35 Train wheel bridge

•Setting position

Refer to the illustrations below to check where to install the respective wheels.

Center wheel and pinion

Main plate

Third wheel and pinion

Fifth wheel and pinion

Step rotor

Fourth wheel and pinion

Fifth wheel and pinion

Step rotor

Third wheel and pinion

Setting wheel

Minute wheel

TECHNICAL GUIDE Cal. 5M42A, 5M43A

44 Switch lever

45 Yoke

46 Setting lever

36 Train wheel setting lever

47 Lever for unlocking stem

•Setting position and lubricating

Refer to the illustration at right.

III. VALUE CHECKING AND ADJUSTMENT

•Coil block resistance

1.7KΩ~ 2.1KΩ

•Generating coil block resistance

280Ω~ 380Ω

•Current consumption

For the whole movement : Less than 0.7µA (with voltage supplied from a battery)

For the circuit block alone : Less than 0.4µA (with voltage supplied from a battery)

Yoke

Lever for unlocking stem

(Only for one-piece case type)

Setting lever

Switch lever

Train wheel setting lever

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