Seiko YT57B Quick start guide

[SPECIFICATIONS]

Cal. No.

Item YT57B

Movement

(x 1.0)

Additional mechanism • Automatic generating system

• Energy depletion forewarning function

• Overcharge prevention function

• Electronic circuit reset switch

• Train wheel setting device

• Date calendar

• Instant setting device for date calendar

Driving system Step motor (Load compensated driving pulse type)

Loss/gain Monthly rate at normal temperature range: less than 20 seconds

Regulation system Nil

Measuring gate by quartz tester Use 10-second gate.

Power

supply Automatic generating systemPower generator

PARTS CATALOGUE /TECHNICAL GUIDE

Cal. YT57B

Movement

size Outside diameter ø27.6 mm

Casing diameter ø27.0 mm

Height 4.3 mm

Time indication 3 hands

Operating voltage range 0.45 V ~ 2.2 V

Duration of charge From full charge to stoppage: Approx. 6 months

Jewels 6 jewels

KINETIC E.S.U. Titanium lithium ion rechargeable battery

PARTS CATALOGUE

Disassembling procedures Figs. : 1 →47

Reassembling procedures Figs. : 47 →1

Lubricating: Types of oil Oil quantity

Moebius A Normal quantity

Moebius F

SEIKO Watch Oil S-6

➡Please see the remarks on the following pages.

Lubricating of some parts is shown in “II. REMARKS ON DISASSEMBLING AND REASSEMBLING”.

Cal. YT57B

0022 247

• Date dial guard screw (3 pcs.)

• Rechargeable battery 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

4 0022 247

Date dial guard screw

5 0808 660

Date dial guard

8 0962 670

Intermediate wheel for

calendar correction

7 0737 670

Date corrector setting

wheel

9 0810 660

Date jumper

10 0816 670

Date driving wheel

11 0271 670

Hour wheel

6 Date dial

2 Dial

3 Holding ring for dial

PARTS CATALOGUE Cal. YT57B

➡Please see the remarks on the following pages.

Lubricating of some parts is shown in “II. REMARKS ON DISASSEMBLING AND REASSEMBLING”.

12 0022 490

Oscillating weight screw

13 0500 661

Oscillating weight

16 4225 519

Rechargeable battery clamp

15 0022 247

Rechargeable battery clamp screw

17 4216 519

Insulator for rechargeable battery

18 3023 24T

Rechargeable battery unit

19 0022 247

Circuit block cover screw

20 4457 760

Circuit block cover

21 4000 734

Circuit block

14 1002 662

Oscillating weight wheel

22 0022 247

Oscillating weight bridge screw

23 4459 500

Conductive plate

24 0198 662

Oscillating weight bridge

25 4002 514

Generating coil block

26 1002 660

Intermediate wheel for generating rotor

27 4146 518

Generating rotor

28 4239 519

Generating stator

30 4002 516

Coil block

29 0022 247

Coil block screw

PARTS CATALOGUE Cal. YT57B

➡Please see the remarks on the following pages.

Lubricating of some parts is shown in “II. REMARKS ON DISASSEMBLING AND REASSEMBLING”.

44 Winding stem

45 0282 672

Clutch wheel

46 0221 676

Center wheel and pinion

47 0100 669

Main plate

43 4239 518

Rotor stator

31 0022 247

Train wheel bridge screw

32 0125 661

Train wheel bridge

33 0391 660

Train wheel setting lever

34 4271 515

Rechargeable battery

connection (+)

35 0241 670

Fourth wheel and pinion

36 0231 530

Third wheel and pinion

37 0701 670

Fifth wheel and pinion

38 4146 531

Step rotor

39 0261 670

Minute wheel

40 0281 670

Setting wheel

41 0384 661

Yoke

42 0383 662

Setting lever

PARTS CATALOGUE Cal. YT57B

Remarks:

3 Holding ring for dial 0866 636

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.

Color of

background

White

Black

3 o’clock

Position of

crown

3 o’clock

Position of

calendar frame Color of figure

Black

White

Part code

0878 729

0878 730

6 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.

44 Winding stem 0351 653

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.

TECHNICAL GUIDE Cal. YT57B

•The explanation here is only for the particular points of Cal. YT57B.

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

INSTRUCTIONS”.

I. STRUCTURE OF THE CIRCUIT BLOCK

Coil output terminal

Crystal unit

Input terminal (–) C-MOS-IC

Input terminal (+)

Automatic generating input terminal

TECHNICAL GUIDE Cal. YT57B

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

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

12 Oscillating weight screw

Tighten the oscillating weight screw firmly,

applying more force than usual.

Oscillating weight screw

II. REMARKS ON DISASSEMBLING AND REASSEMBLING

For disassembling and reassembling, be sure to use the universal movement holder.

1 Hands

18 Rechargeable battery unit

Though they have a close resemblance in shape, the rechargeable battery unit for Cal. YT57B is of a

completely different type from that for Cal. 5M6 Series. They can be discriminated in the point that the

latter has a hole for discrimination on its minus lead terminal while the former doesn’t as illustrated

below. When repairing the rechargeable battery unit, check that it has no hole for discrimination on the

minus lead terminal to make sure you are using the proper one.

Minus lead terminal

[ Rechargeable battery unit for Cal. YT57B ] [ Rechargeable battery unit for Cal. 5M6 Series ]

Minus lead terminal

No hole for

discrimination Hole for

discrimination

TECHNICAL GUIDE Cal. YT57B

•How to remove

Insert the tip of tweezers into the “C” portion

gap in the illustration at right, and pry up the

rechargeable battery unit to remove it.

•How to install

Set the “A” portion of the minus lead terminal

to the hole of the main plate, and push the “B”

portion down vertically so that the

rechargeable battery unit is well seated in

position.

Note: Take utmost care not to short-circuit the

(+)and(–)terminals,asthiswilldeteriorate

the battery unit.

“A” portion

Main plate

“C” portion Minus lead terminal

Rechargeable

battery plus

terminal

“B” portion

20 Circuit block cover

Circuit block cover for after-sales servicing use

hasno suchmarks printedon itas calibrenumber

and numeral indicating hand installation height.

21 Circuit block

The circuit block for Cal. YT57B and that for Cal. 5M6 Series have a close resemblance in shape. They

can be discriminated in the point that the former has a hole for discrimination while the latter doesn’t

as illustrated below. When repairing the circuit block, check the hole for discrimination to make sure

you are using the proper one.

Hole for discrimination No hole for discrimination

[ Circuit block for Cal. YT57B ] [ Circuit block for Cal. 5M6 Series ]

TECHNICAL GUIDE Cal. YT57B

Lubricating: : Moebius A

22 Oscillating weight bridge screw

24 Oscillating weight bridge

· Before tightening the oscillating weight bridge

screw, check that the upper pivot of the

generating rotor is inserted properly into the

pivot jewel.

· Be sure to lubricate the upper and lower pivots

of generating rotor and intermediate wheel for

generating rotor with the proper oil in the

quantity specified in the illustration.

· Lubricate the ball-bearing of the oscillating

weight bridge as shown in the illustration at

right.

Intermediate wheel for

generating rotor

Generating rotor

25 Generating coil block

The generating coil block for Cal. YT57B and that for Cal. 5M4 Series have a close resemblance in shape.

They can be discriminated by the size of the pattern on the lead terminal. If the generating coil block

for Cal. 5M4 Series is assembled by mistake, no electricity will be generated. When repairing the

generating coil block, check the size of the pattern on the lead terminal to make sure you are using the

proper one.

Smaller pattern Larger pattern

[ Generating coil block for Cal. YT57B ] [ Generating coil block for Cal. 5M4 Series ]

26 Intermediate wheel for generating rotor

•Lubricating

Refer to the illustration at right.

Note: Be sure to observe the position, type of oil

and quantity of the lubrication specified

in the illustration.

TECHNICAL GUIDE Cal. YT57B

35 Fourth wheel and pinion

36 Third wheel and pinion

37 Fifth wheel and pinion

38 Step rotor

39 Minute wheel

40 Setting wheel

•Setting position and lubricating

Refer to the illustrations below for the setting position and lubrication of the respective wheels.

Lubricating: : Moebius A : Moebius F

Fifth wheel

and pinion

Step rotor

Setting wheel

Fourth wheel

and pinion

Minute wheel

Third wheel

and pinion

Center wheel

and pinion

Step rotor Fifth wheel

and pinion Fourth wheel

and pinion Third wheel

and pinion

46 Center wheel and pinion

Note: Be sure to observe the position, type of oil

and quantity of the lubrication specified in

the illustration.

Minute wheel

Setting wheel

TECHNICAL GUIDE Cal. YT57B

Lubricating: : Moebius A : SEIKO Watch Oil S-6

33 Train wheel setting lever

41 Yoke

42 Setting lever

•Setting position and lubricating

Refer to the illustration at right.

Train wheel setting lever

Setting lever

Yoke

III. VALUE CHECKING AND ADJUSTMENT

●Coil block resistance

1.7 KΩ~ 2.1 KΩ

●Generating coil block resistance

280 Ω~ 380 Ω

●Current consumption

For the whole movement : Less than 0.80 µA (with 1.55 V supplied from a battery)

For the circuit block alone : Less than 0.20 µA (with 1.55 V supplied from a battery)

1. Make the movement ready for measurement.

How to measure the current consumption for the whole movement

1) Follow the disassembling procedure

illustrated in this manual until you remove

the rechargeable battery unit.

2) Temporarily tighten the screw “A” in the

illustration, taking care not to tighten it

excessively.

3) Install the oscillating weight wheel and

oscillating weight and then tighten the

oscillating weight screw.

Screw “A”

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