Seiko Y911A Quick start guide

PARTS CATALOGUE /TECHNICAL GUIDE

Cal. Y911A

(x 1.0)

Movement

Item

[SPECIFICATIONS]

Cal. No. Y911A

Outside diameter ø33.0 mm

*The liquid crystal panel unit is installed

after the installation of the dial and hands,

and then the movement can be cased to

complete the reassembly procedures.

Height (including

the liquid crystal

panel unit)

Movement size

6.9 mm

Time indication Analogue section Digital section

3 hands High molecular, dispersion

type liquid crystal display

Driving system Step motor (Load compensated

driving pulse type) 1/2 multiplex driving system

Display system •Time display •Calendar display

•Electronic circuit reset switch

•Train wheel setting device

•Battery life indicator

•Alarm function (regular alarm

and single-time alarm)

•Hourly time signal function

•Stopwatch function

•Lap time/split time memory

recall function

Additional mechanism

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

Regulation system Nil

Measuring gate by quartz tester

Jewels 1 jewel

Use 10-second gate.

SEIKO SR927W, Maxell SR927W, Sony SR927W, EVEREADY 399

Battery life is approximately 2 years.

Voltage: 1.55 V

Battery

Liquid crystal panel unit

Disassembling procedures Figs. : 1 →43

Reassembling procedures Figs. : 43 ←1

Lubricating: Types of oil Oil quantity

Moebius A Normal quantity

PARTS CATALOGUE Cal. Y911A

➡➡Please see the remarks on the following pages.

1 4281 609

Contact point spring

2 Liquid crystal

panel unit

6 4313 609

Connector

0022 247

• Battery clamp screw (1 pc.)

• Spacer screw (1 pc.)

• Battery connection (+) screw (2 pcs.)

• Coil block screw (1 pc.)

8 Dial

10 0271 933

Hour wheel

7 Hour, minute and

second hands

9 0491 735

Dial washer

Liquid crystal panel unit

4 4520 609

Liquid crystal panel

3 Dial ring

5 4512 609

Liquid crystal panel

frame

➡➡Please see the remarks on the following pages.

PARTS CATALOGUE Cal. Y911A

17 4457 868

Circuit block cover

18 4216 609

Insulator for circuit block

19 4246 609

Buzzer lead terminal

20 4000 609

Circuit block

21 0439 609

Spacer

22 4410 609

Circuit cover

15 Winding stem

12 0022 247

Battery clamp screw

11 0110 869

System reset

comment sheet

13 4225 689

Battery clamp

14 Battery

(See the front page.)

16 0022 247

Spacer screw

➡➡Please see the remarks on the following pages.

PARTS CATALOGUE Cal. Y911A

43 0100 619

Main plate

42 0221 929

Center wheel and pinion

41 0282 890

Clutch wheel

40 0384 890

Yoke

39 0383 176

Setting lever

38 4239 892

Rotor stator

37 4002 907

Coil block

36 0022 247

Coil block screw

35 0391 890

Train wheel setting lever

34 0281 904

Setting wheel

33 0261 908

Minute wheel

32 4146 886

Step rotor

31 0701 904

Fifth wheel and pinion

30 0231 904

Third wheel and pinion

29 0241 929

Fourth wheel and pinion

28 0125 619

Train wheel bridge

27 4311 609

Output lead terminal

26 4268 609

Battery connection (+)

25 0022 247

Battery connection (+) screw

24 4270 609

Battery connection (–)

23 4216 608

Insulator for battery

PARTS CATALOGUE Cal. Y911A

TECHNICAL GUIDE Cal. Y911A

•The explanation here is only for the particular points of Cal. Y911A.

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

INSTRUCTIONS”.

I. STRUCTURE OF CIRCUIT BLOCK

II. REMARKS ON REMOVING AND INSTALLING THE BATTERY

•To remove the battery, first, peel off the system reset comment

sheet, and then, remove the battery clamp.

•After installing the battery, be sure to attach the sheet at the

position indicated in the illustration at right.

Reset (AC) terminal Input terminal (+)

Input terminal (–)

Buzzer lead terminal

C-MOS-IC

Upconverter coil

System reset comment sheet

Post

Battery clamp screw

•After the battery is replaced with a new one, or after the battery

is re-installed following the repairing procedures, be sure to

short-circuit the AC terminal of the circuit block and the circuit

block cover with conductive tweezers to reset the circuit as

illustrated at right.

Circuit block cover

Tweezers

The type of winding stem is determined based on the design of cases. Check the case number and refer to

“PULSAR Casing Parts Catalogue” to choose a corresponding winding stem.

15 Winding stem 0351 880

Crystal unit

Coil output terminal

AC terminal

Remarks:

TECHNICAL GUIDE Cal. Y911A

III. REMARKS ON DISASSEMBLING AND REASSEMBLING

•For disassembling and reassembling of Cal. Y911A, be sure to use the movement holders for exclusive use

with the movement.

Winding stem setting

position

•When disassembling or reassembling, be sure to ground the movement holders.

1 Contact point spring

•How to remove

1) Pull out the winding stem to the first click.

2) Hold the center of the contact point spring and lift

it up as shown in the illustration at right.

Note: Take care not to deform the contact point spring.

Winding stem setting

position

•Before removing the winding stem, be sure to remove the contact point spring.

Before installing the contact point spring, be sure to install the winding stem.

Contact point spring

Pull out the winding stem

to the first click.

Movement holder for anchoring

the caseback side

Movement holder for

anchoring the dial side

TECHNICAL GUIDE Cal. Y911A

•How to install

1) Pull out the winding stem to the first click.

2) Set the slit portion (“A” portion in the illustration below) of the contact point spring to the winding stem,

and then insert the contact point spring in the gap between the movement and case.

3) Push down the contact point spring at the center until it is set properly.

4) Push the winding stem back in to the normal position.

•How to remove

Release all four hooks of the liquid crystal panel from

the movement, and then lift up the liquid crystal panel

unit.

•How to install

1) Set the three connectors to the connector guide

portions of the liquid crystal panel unit, and then, set

the panel unit level to the movement.

Contact point spring

2Liquid crystal panel unit

Pull out the winding stem

to the first click.

“A” portion

Winding stem

Contact point spring

Case

Movement

Contact point spring setting position

Connectors

TECHNICAL GUIDE Cal. Y911A

3) After installing the liquid crystal panel unit, check

that all the segments of the display light up.

(To light up all the segments of the display, refer to

“All the segments lit up”.)

Note: If any of the segments do not light up, remove

the liquid crystal panel unit and re-install it.

3 Dial ring

4 Liquid crystal panel

5 Liquid crystal panel frame

First, reassemble the dial ring, liquid crystal panel and liquid crystal panel frame into a unit, and then, set the

unit to the movement.

•To reassemble the parts into the liquid crystal panel unit

1) Place the liquid crystal panel frame so that the panel

backlash correction spring portion is positioned at

upper right as shown in the illustration at right.

Panel backlash

correction spring

All the segments lit up

2) Set the liquid crystal panel to the liquid crystal panel

frame so that the three fish eyes and the center of the

three electrodes are positioned at the upper right

and at the bottom, respectively.

Electrode

Liquid crystal panel

Identification fish eyes

2) Press the liquid crystal panel unit evenly with a flat

plate or the like so that all the hooks at the 12 o’clock,

3 o’clock, 6 o’clock and 9 o’clock sides catch the

movement at the same time.

Note: Check that all the four hooks securely catch the movement.

Press the panel lightly and evenly.

Plastic plate

Liquid crystal panel unit

Movement holder for exclusive

use with Cal. Y911A

Post

Hole

Post

Hole

TECHNICAL GUIDE Cal. Y911A

3) Set the dial ring to the liquid crystal panel frame so

that its thickest rim and the corner having one

protrusion are positioned atop and at the upper

right, respectively.

•Precautions on the liquid crystal panel

• Be sure to ground the movement holder.

• Use finger cots to hold the liquid crystal panel. Do not

hold it too tightly with tweezers, etc. The liquid crystal

panel is rather vulnerable to external pressure which

could cause the liquid crystal to leak.

• Hold the liquid crystal panel at the side faces, taking

care not to touch the electrodes.

• If dust collects on the liquid crystal panel, apply a

rodico gently to the dust to wipe it off.

• If the liquid crystal panel is soiled, wipe it gently with a

soft cloth soaked with alcohol.

17 Circuit block cover

•How to install

Have the three hooks of the circuit block cover catch the

main plate securely as shown in the illustration at right.

Hook

Thickest rim

Protrusion (1 pc.)

Dial ring Liquid crystal panel unit

spacer

Output lead

terminal

21 Spacer

Set the spacer as shown in the illustration at right.

•How to install

Hook

TECHNICAL GUIDE Cal. Y911A

24 Battery connection (–)

Set the battery connection (–) to the main plate so that

there is no gap between them (“A” and “B” portions in

the illustration at right).

26 Battery connection (+)

Have the two hooks of the battery connection (+) catch

the main plate securely.

•How to install

Main plate

Hook

28 Train wheel bridge

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

•Setting position

Step rotor

Fifth wheel and pinion

Third wheel and pinion

Setting wheel

Fourth wheel and pinion

Minute wheel

Step rotor

Fifth wheel and pinion

Third wheel and pinion

Setting wheel

Center wheel and pinion

Refer to the illustration at right.

•Setting position

35 Train wheel setting lever

39 Setting lever

40 Yoke

Train wheel setting lever

Yoke

Setting lever

Battery connection (–)

Tube

Hook

Minute wheel

Fourth wheel

and pinion

Winding stem

Clutch wheel

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