Seiko W850A Quick start guide

PARTS CATALOGUE /TECHNICAL GUIDE

Cal. W850A, W851A

Cal. W853A, W854A

Cal. No.

Item W850A, W851A, W853A, W854A

(x 1.0)The illustrations refer to Cal. W853A.

Module

Module size Outside diameter ø29.0 mm

–Casing diameter

Height 6.0 mm (Including the battery portion)

Display medium Nematic Liquid Crystal, FEM (Field Effect Mode)

Liquid crystal driving system Multiplex driving system

Display system • Time/calendar display

• Stopwatch display (Up to 9 hours, 59 minutes and 59.99 seconds in

1/100 seconds)

• Alarm display (5-channel daily alarm)

• Timer display (Two types of countdown timer: Preset timer with 10

preset times and 10-hour adjustable timer)

• World time display (38 cities)

Additional mechanism • Selection of a desired mode in the menu display

• Changeover between the normal and enlarged displays

• Quick digits moving function

• Graphic display, scroll display and motion graphic demonstration

function

• Auto illumination function

• Electroluminescent panel

• Battery life indicator

• Sound demonstration

• Changeover between 12- and 24-hour indications

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

Regulation system Nil

Measuring gate by quartz tester Any gate can be used.

Battery SEIKO CR2025, Sony CR2025, Matsushita CR2025

Battery life is approximately 2 years.

Voltage: 3.0 V

[SPECIFICATIONS]

PARTS CATALOGUE Cal. W850A, W851A, W853A, W854A

Disassembling procedures Figs. : 1 →23

Reassembling procedures Figs. : 23 →1

Lubricating: Types of oil Oil quantity

Silicone oil 500,000 Normal quantity

➡Please see the remarks on the following pages.

Button A

Button B

Button C

Button D

Button E

Button F

Button spring clip

7 Conductive plate for the front button

6 Conductive plate for the side button

5 Module

3 Case back gasket

1 Case back screw

4589 024

Piezoelectric element

2 Case back

4 4246 066

Buzzer lead terminal

PARTS CATALOGUE

➡Please see the remarks on the following pages.

(Reversed battery guard)

(Reversed liquid crystal panel frame)

19 4313 137

Connector

Cal. W850A, W851A, W853A, W854A

8 0110 196 (Cal. W850A)

0110 197 (Cal. W851A)

0110 211 (Cal. W853A)

0110 132 (Cal. W854A)

Sticker

10 Battery

(See the front page.)

9 4225 098

Battery clamp

11 Switch spring (A)

12 4395 046

Battery guard

13 4408 068

Spacer for switch spring (B)

14 4245 235

Switch spring (B)

15 4290 036

Rubber switch

16 4270 118

Battery connection (–)

17 4271 333

Battery connection (+)

18 4003 306 (Cal. W850A)

4003 307 (Cal. W851A)

4003 309 (Cal. W853A)

4003 310 (Cal. W854A)

Circuit block

20 4510 394 (Cal. W850A, W851A)

4510 364 (W851A)

4510 402 (Cal. W853A, W854A)

Liquid crystal panel

21 4536 025

Electro-

luminescent

panel

22 4246 085

Electro-

luminescent

lead terminal

23 4512 044

Liquid crystal

panel frame

Remarks:

PARTS CATALOGUE Cal. W850A, W851A, W853A, W854A

•Conductive spring

Some models use a conductive spring as a casing part. Check the case number and refer to “SEIKO Parts

Catalogue”.

20 Liquid crystal panel

The type of liquid crystal panel is determined based on the design of cases. Check the case number and

refer to “SEIKO Parts Catalogue” to choose a corresponding liquid crystal panel.

TECHNICAL GUIDE

•The explanation here is only for the particular points of Cal. W850A, W851A, W853A and W854A.

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

INSTRUCTIONS”.

I. STRUCTURE OF THE CIRCUIT BLOCK

II. REMARKS ON INSTALLING THE BATTERY

After the battery is replaced with a new one, or after the battery is re-installed following the repairing

procedures, be sure to follow either of the two methods below to reset the circuit.

•METHOD 1

To reset the circuit of a module:

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

battery positive surface with conductive tweezers as

illustrated at right.

Cal. W850A, W851A, W853A, W854A

Input terminal (+) Input terminal (–)

Crystal unit

C-MOS-IC

Tweezers

AC terminal

Battery (+) side

TECHNICAL GUIDE Cal. W850A, W851A, W853A, W854A

•METHOD 2

To reset the circuit of a complete watch:

Press and hold buttons “A”, “B”, “C” and “E” at the

same time for 2 to 3 seconds.

* The display will become blank, indicating that the

circuit is reset. Then, the display will return to the

MENU display.

* After resetting the circuit, be sure to set the time/

calendar again as the time/calendar data returns

to the initial settings.

Button C

Button A

Button B

Button E

III. REMARKS ON DISASSEMBLING AND REASSEMBLING

•Piezoelectric element 4589 024

The piezoelectric element, which is adhered to the case back, is available for supply separately from the

case back.

Use the universal movement holder for disassembling and reassembling.

4 Buzzer lead terminal

•How to remove

Turn the buzzer lead terminal to release its end

portion from the groove of the battery guard,

and then remove it.

•How to install

Set the end portion of the buzzer lead terminal

into the groove of the battery guard, and then

turn it to fix it.

➡

End portion of the

buzzer lead terminal

6 Conductive plate for the side button

7 Conductive plate for the front button

•How to install

• Insert the conductive plates for the side and front buttons into the gap between the button spring

clip and the case middle as shown in the illustrations on the next page.

TECHNICAL GUIDE Cal. W850A, W851A, W853A, W854A

Conductive plate Case middle Conductive plate for the side button Conductive plate for the front button

Button spring clip Case back

Conductive plate

• When closing the case back, check that the

conductive plates are in contact with the case back,

being bent by it towards the center of the watch.

• In doing so, the case back may be hard to set in

position, as the conductive plates have a repelling

force when bent.

9 Battery clamp

•How to remove

Insert the tip of tweezers into the protrusion of the

hooking portion of the battery clamp and pry it up

toward the direction of the arrow in the illustration at

right to remove it.

Tweezers

Battery clamp

10 Battery

•How to install

Set the battery in the direction of the arrow with its

(–) side down.

11 Switch spring (A)

•How to remove

Release the four hooking portions of the switch spring (A) indicated by the arrows in the illustration

on the next page, and then, lift it up to remove.

•How to install

Set the switch spring (A) to the guide posts “a” and “b” in the illustration on the next page, and then,

have the four hooking portions of the switch spring catch the module securely.

TECHNICAL GUIDE Cal. W850A, W851A, W853A, W854A

• Do not disassemble the switch spring (B) and its spacer except when they need to be replaced.

• When installing the spacer for switch spring (B), take care not to set it in the wrong direction. (See

the exploded view on page 3.)

13 Spacer for switch spring (B)

14 Switch spring (B)

[ How to release the hooking portion ]

15 Rubber switch

16 Battery connection (–)

17 Battery connection (+)

18 Circuit block

•How to install

First, set the rubber switch, battery connection (–) and battery connection (+) to the circuit block in

the positions as indicated in the illustration below. Then, install the battery guard from above to fix

them securely to the movement. In doing so, take care lest the switch and connections should get

out of position.

Battery connection (–)Battery connection (+)

Rubber switch

TECHNICAL GUIDE Cal. W850A, W851A, W853A, W854A

•How to install

Set the end portion of smaller diameter to the guide

hole of the liquid crystal panel frame.

22 Electroluminescent lead terminal

Liquid crystal

panel frame

Electroluminescent

lead terminal

23 Liquid crystal panel frame

•How to remove

Release the hooking portion of the liquid crystal panel

frame (“A” portion in the illustration at right) by

moving it in the direction of the arrow with the tip of

tweezers, and remove the liquid crystal panel.

•How to install

Slip the liquid crystal panel into the gap under “B”

portion of the liquid crystal panel frame, release “A”

portion by moving it in the direction of the arrow with

the tip of tweezers, and then, set the liquid crystal

panel.

20 Liquid crystal panel

“A” portion Liquid crystal panel

“B” portion

IV. VALUE CHECKING

•Current consumption

For the whole module : Less than 9.4 µA (with voltage of 3.0 V supplied from a battery)

For the circuit block alone : Less than 5.5 µA (with voltage of 3.0 V supplied from a battery)

•All the segments lit up

How to light up all the segments

In the TIME/CALENDAR mode, press and hold button “B” for 2 to 3 seconds to show the TIME/CALENDAR

SETTING display, and then, press buttons “C” and “D” at the same time to light up all the segments of the

display.

•With all the segments lit up, check for abnormal displays, etc.

•To return to the normal display, press button “A”, “B”, “C”, “D”, “E” or “F”. (The watch will return to

the TIME/CALENDAR mode.)

(Correction: Current consumption 2009.01.21 )

TECHNICAL GUIDE Cal. W850A, W851A, W853A, W854A

•Time accuracy

1) Light up all the segments of the display, following the procedure above.

2) Place the watch on the microphone’s mark for placing the watch with the liquid crystal panel facing

the mark.

* If a stable measurement cannot be obtained, adjust the level by turning the level adjuster knob.

HOW TO USE

•The functions and operation of the buttons are listed below. For checking or repair of the watch, refer to

the table below for guidance.

Cal. W850A, W851A, W853A, W854A

Button C

Button A

Button B

Button D

Button E

Button F

Turning on the

electroluminescent

light

Button F

One press:

Scrolling the

name of the

selected city

Continuous

press for 2 to 3

seconds:

Displaying the

city name, and

then, activating

the demonstra-

tion function

Button E

Changeover bet-

ween the normal

and enlarged

displays

Button D

–

Button C

TIME/

CALENDAR

SETTING

function by

pressing for 2 to

3 seconds

Button B

Returning to the

MENU display

Button A

In the MENU

display

In the selected mode

Press button

“A” to show

the TIME/

CALENDAR

mode.

Turning on the

electroluminescent

light

Selection of the

desired alarm

channel (from

channel 1 to 5)

Changeover bet-

ween the normal

and enlarged

displays

Engagement/

disengagement

of the alarm

ALARM

SETTING

function by

pressing for 2 to

3 seconds

Returning to the

MENU display

Press button

“B” to show

the ALARM

mode.

Turning on the

electroluminescent

light

Resetting the

stopwatch

Changeover bet-

ween the normal

and enlarged

displays

Start/stop of the

stopwatch

MEMORY

RECALL

function

Returning to the

MENU display

Press button

“C”toshowthe

STOPWATCH

mode.

Turning on the

electroluminescent

light

Resetting the

timer

Selection of the

preset time

Changeover bet-

ween the normal

and enlarged

displays

Start/stop of the

timer

ADJUSTABLE

TIMER SETTING

function by

pressing for 2 to

3 seconds

Returning to the

MENU display

Press button

“D” to show

the TIMER

mode.

Turning on the

electroluminescent

light

Selection of

cities

Changeover bet-

ween the normal

and enlarged

displays

Selection of

cities

Changeover

between the

standard time

and daylight

saving time

Returning to the

MENU display

Press button

“E” to show

the WORLD

TIME mode.

––––––Press button

“F” to

illuminate the

display.

* By pressing the corresponding button in the MENU display, a desired mode can be selected as shown in the

table above.

* The table above covers the basic button operations of the watch only. Use it for the checking after repair.

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