Seiko A860A Installer manual

PARTS CATALOGUE/TECHNICALGUIDE

Cal. A860A

Cal. A861A

[SPECIFICATIONS]

Cal. No.

Item A860A A861A

(x 1.0)The illustrations refer to Cal. A860A.

Module

Module size Outside diameter ø32.0 mm

31.6 mm between 3 o’clock and 9 o’clock sides

31.7 mm between 6 o’clock and 12 o’clock sides

–Casing diameter

Height 7.1 mm (Including the battery portion)

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

Liquid crystal driving system Multiplex driving system

Display system • Time display

• Stopwatch display (In 1/100 second increments for the first 20 minutes)

• Alarm display

Additional mechanism • Speaking function (Current time, stopwatch measurements, hourly

time signal, alarm time and selected digits to be adjusted)

• Battery life indicator

• Alarm test system

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, Maxell CR2025, Sony CR2025, Matsushita CR2025,

Eveready ECR2025

Battery life is approximately 2 years.

Voltage: 3.0 V

PARTS CATALOGUE Cal. A860A, A861A

Disassembling procedures Figs. : 1 →21

Reassembling procedures Figs. : 21 ←1

Lubricating: Types of oil Oil quantity

Silicone oil 500,000 Normal quantity

➡➡Please see the remarks on the following pages.

1 Case back screw

2 Case back

3 Case back gasket

4 Module

5 Spacer screw

6 Spacer

7 4580 009

Speaker block

8 Conductive plate for the side button

9 Conductive plate for the front button

Button B

Button A

Button C

Button spring clip

Button D

(Front button)

PARTS CATALOGUE Cal. A860A, A861A

110 151

Installing direction

indication sheet

➡➡Please see the remarks on the following pages.

(Reversed battery guard)

(Reversed liquid crystal panel frame)

10 4225 435

Battery clamp

11 Battery

(See the front page.)

12 4245 280

Switch spring (A)

13 4408 068

Washer for switch spring (B)

14 4245 270

Switch spring (B)

15 4395 038

Battery guard

16 4270 371

Battery connection (-)

17 4003 190

Circuit block

18 4313 117

Connector

19 4246 087

Speaker lead

terminal

21 4512 033

Liquid crystal

panel frame

20 4510 355

Liquid crystal

panel

TECHNICAL GUIDE Cal. A860A, A861A

•The explanation here is only for the particular points of Cal. A860A and A861A.

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

INSTRUCTIONS”.

I. STRUCTURE OF THE CIRCUIT BLOCK

Input terminal (+)

Crystal unit

Input terminal (–)

C-MOS-IC

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.

* When the circuit is reset , “AM 12:00 oo” is displayed as the seconds start counting immediately.

* After resetting the circuit, set the time. (See “HOW TO USE”.)

AC terminal

Tweezers

Battery (+) side

•METHOD 2

To reset the circuit of a complete watch:

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

time for 2 to 3 seconds.

* The display will become blank, indicating that the circuit

is reset.

Button CButton B

Button D

Button A

TECHNICAL GUIDE Cal. A860A, A861A

Speaker lead

terminal

III. REMARKS ON DISASSEMBLING AND REASSEMBLING

Use the universal movement holder for disassembling and reassembling.

•How to install

Setthespeakerblocksothatthespeakerleadterminal

is positioned between the guide grooves of the case

as shown in the illustration at right.

Note: When installing the speaker block, take care not

to damage its transparent sound diaphram.

Guide groove

8 Conductive plate for the side button

9 Conductive plate for the front button

7 Speaker block

•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 below.

Conductive plate Case middle

Button spring clip

Conductive plate for the side button Conductive plate for the front button

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.

10 Battery clamp

•How to remove

Insert the tip of tweezers into the center 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

TECHNICAL GUIDE Cal. A860A, A861A

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

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

view on page 3.)

11 Battery

•How to install

Set the battery with its (-) side down.

12 Switch spring (A)

•How to remove

Release the five hooking portions of the switch spring

(A) indicated by the arrows in the illustration at right,

and then, lift it up to remove.

•How to install

Set the switch spring (A) to the guide posts “a”, “b”,

“c”, “d” and “e” in the illustration at right, and then,

have the five hooking portions of the switch spring

catch the module securely.

13 Washer for switch spring (B)

14 Switch spring (B)

•How to install

Set the end portion of smaller diameter to the guide

hole of the liquid crystal panel frame.

19 Speaker lead terminal

Liquid crystal

panel frame

Speaker lead terminal

20 Liquid crystal panel

•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”

portions 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.

“B” portion

“A” portion

Liquid crystal panel

TECHNICAL GUIDE Cal. A860A, A861A

IV. VALUE CHECKING

•Speaker block resistance

44 Ω~ 84 Ω

•Current consumption

For the whole module : Less than 5.0 µA (with voltage supplied from a battery)

For the circuit block alone : Less than 4.0 µA (with voltage supplied from a battery)

•All the segments lit up

How to light up all the segments

Press and hold button “B” for 2 to 3 seconds to show the TIME 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.

[All the segments lit up]

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

mode.)

•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 Cal. A860A, A861A

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

the table below for guidance.

Button C

Button D

(Speaking function)

Button B

Button A

(Changeover of modes)

Button C

Button B

TIME mode

ALARM mode

▼

(Not pressed)

STOPWATCH

mode

Button D

(Speaking button)

Button A

(Changeover of modes)

TIME SETTING function by

pressing for 2 to 3 seconds Selection of the digits

(flashing) to be adjusted

Engagement/disengage-

ment of the hourly time

signal

Engaged: Hourlytimesignal

mark is displayed.

Disengaged: Hourly time

signalmark isnot displayed.

Resetting the stopwatch Start/stop of the stopwatch

(Not pressed)

Engagement/disengage-

ment of the alarm

ALARM SETTING function

by pressing for 2 to 3

seconds

Selection of the digits

(flashing) to be adjusted

Announcement of the

current time by voice

Setting the seconds,

minutes and hour

Announcement of the

elapsed time by voice

Annoucement of the alarm

time or digits to be

adjusted, by voice

Hour and minute setting

* With each press of button “A”, the mode changes over in the above order.

* By pressing a button in each display, the function to be performed is announced by voice. (Speaking

function)

HOW TO USE Cal. A861A

HOW TO REMOVE/ATTACH THE RING AND AIR CHAMBER (FOR CAL. A861A)

•Before removing the air chamber from the watch case or attaching it to the case for such purposes as

cleaning and replacement with a new one, be sure to push the air release button to let the air completely

out of it.

•Before replacing the battery with a new one, be sure to remove the air chamber from the watch case.

•Parts of the air chamber

Air release button

Ring

Air pump

Air chamber

1) Insert a coin or the like into the groove of the air pump support on the rear of the watch, and move it

toward 12 o’clock side to release it from the spring bar “A”. The support snaps out of its place.

Air pump

Groove

Spring bar “A”

Air pump support

[Cross-sectional view]

2) While squeezing the air pump with fingers, pull out the air chamber through the gap between the case

hole and spring bar “A”.

3) Turn the air chamber 90°. Then, push in the air release button to remove the air chamber from the case.

In doing so, the ring may also come off from the case, and therefore, hold it with a finger, taking care

not to lose it.

•How to remove

Air chamber

Air release button

Case

Air chamber

HOW TO USE Cal. A861A

•How to attach

1) Set the ring at the 12 o’clock side of the case.

* The two protruding portions of the ring differ in size. Check that they are set to the hollows of the

corresponding sizes.

Ring (Rear side)

Smaller hollow

Smaller protruding portion

Larger protruding portion

Larger hollow

2) While holding the ring with a finger, turn the case over, set the air release button to the slot of the case,

and turn the air chamber 90°to fix the ring to the case.

Slot

Case

Air release button

Air chamber

3) Open the air pump support. Then, while squeezing the air pump with fingers, put the air chamber

through the gap between the spring bar “A” and case to set it in position.

Air chamber

Air pump support

[Cross-sectional view]

Spring bar “A”

Air pump

4) Have the hooking portion of the air pump support catch the spring bar “A” securely. To do so, insert

a coin or the like into the groove of the support and move it toward the 6 o’clock side until it snaps in

place.

[Cross-sectional view]

Coin

Spring bar “A”

Air pump support

Spring bar “A”

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