Seiko V657 Parts Catalog - Page 3

TECHNICAL

GUIDE

Cal.

VS57A

•

The

explanation

here

is

only

for

the

particular

points

of

Cal,

V657A.

•

For

the

repairing,

checking

and

measuring

procedures,

refer

to

the

"TECHNICAL

GUIDE,

GENERAL

INSTRUCTIONS",

I.

STRUCTURE

OF

THE

CIRCUIT

BLOCK

O

Input

tot

minat

0

Input

terminal

1+)

II.

REMARKS

ON

INSTALLING

THE

BATTERY

C-MOS-LSI

Crystal

unit

--

Coil

block

output

terminal

(for

motor

driving

chronograph

hands)

--

Cod

block

output

terminal

(tor

motor

driving

center

handsl

•

After

the

battery

is

replaced

with

a

new

one,

or

after

the

battery

is

re

-installed

following

repairing

procedures,

be

sure

to

short-circuit

the

AC

terminal

of

the

circuit

block

and

the

battery

connection

I+)

with

conductive

tweezers

to

reset

the

circuit

as

shown

in

the

illustration

below.

(When

checking

the

current

consumption,

short-circuit

with

power

supplied

from

an

external

source.)

•

0®

ti0NIPICA

MEI

W.

AVM

-'I

MOSI1

•

20

-

0

0

fi

PIAM•

NO/

•

,to

•

The

circuit

can

be

reset

with

the

complete

watch.

Follow

the

procedure

below.

0

0

0

0

1.

Pull

out

the

crown

to

the

second

click.

2.

Press

buttons

"A"

and

"B"

at

the

sometime

for

approximately

2

seconds.

*

The

chronograph

second

hand

makes

half

a

revolution

counterclockwise

and

then

returns

to

where

it

was.

The

chronograph

1/10

second

hand

makes

a

full

revolution

clockwise

and

stops.

tweezers

4.4

Id

all

A

B

TECHNICAL

GUIDE

Cal.

V657A

3.

Press

button

"A"

repeatedly

to

reset

the

chronograph

1/10

second

hand

to

the

"0"

position.

Press

button

"B"

repeatedly

to

reset

the

chronograph

second

and

minute

hands

to

the

"0"

position.

*

The

chronograph

minute

hand

moves

correspondingly

with

the

chronograph

second

hand.

*

The

hands

move

quickly

if

the

respective

buttons

are

kept

pressed.

4,

Turn

the

crown

to

set

the

desired

time

and

push

the

crown

back

in

to

the

normal

position.

III.

REMARKS

ON

DISASSEMBLING

AND

REASSEMBLING

Use

the

universal

movement

holder

for

disassembling

and

reassembling.

0

-

)

Hour,

minute

and

second

hands

0

Chronograph

minute,

second

and

1/10

second

hands

Since

a

plastic

main

plate

is

used,

place

the

movements

on

a

flat

metal

plate

or

the

like,

and

then

install

the

hands

at

the

position

as

specified

below.

Before

doing

so,

chock

that

the

battery

is

installed

in

the

movement.

Li

r.

f-4

Hands

to

be

installed

Positions

M

which

hands

are

installed

Hour,

minute

and

second

hands

Chronograph

1/10

secor.d

hand

Chronograph

minute

and

second

hands

(D

Dial

12

o'clock

position

"0"

position

60

minute/second

position

Pry

up

the

dial

at

the

two

recessed

portions

indicated

in

the

illustration

using

a

screwdriver.

(I

cio?

O

0

e

••••••••-•.-

•C)

•

5

Seiko V657 Parts Catalog - Page 3

Technical, Guide

Page 3 highlights