Seiko H024A Technical Manual

Movement

Item

H024A

Jewels

Cal. No.

—

[SPECIFICATIONS]

• Hourly time signal

• Alarm test system

• Sound for button operation confirmation

• Battery life indicator

Additional mechanism

Monthly rate within normal temperature range: less than 15 secondsLoss/gain

Nil

Regulation system

Use 10-second gate.Measuring gate by quartz tester

SB-BU (SR1130W)
Battery life is approximately 3 years.
Voltage: 1.55V

Battery

(x 1.2)

Movement
size

Outside diameter

ø31.0 mm

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

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

ø30.0mm

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

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

Casing diameter

5.5 mm

Height

Analogue section Digital sectionTime indication

Driving system

Multiplex driving system

Step motor, 1 piece

2 hands
(Hour and minute hands)

Nematic Liquid Crystal, FEM (Field Effect
Mode)

• Time/calendar display

• Hour, minute and second

• Selection of 12h/24h-format indication

• Year, month, date, day of the week and
fully automatic calendar between the year
2006 and 2055

• Stopwatch display

•Hour, minutes, seconds and 1/1000
seconds

• Up to 23 hours 59 minutes 59 seconds and
999

• Data recall function

• Alarm display

• Daily alarm (2 channels)

• Timer

• Up to 23 hours and 59 minutes

• Time display

• Hour and minute hands, two
hands straight 10-second
increments

Display system

Cal. H024A

2 jewels

PARTS CATALOGUE / TECHNICAL GUIDE

PARTS CATALOGUE

Cal. H024A

2/7

● For the part 6, please see the remarks on the following pages.

Disassembling procedures Figs. :
Reassembling procedures Figs. :
Lubricating : Types of oil Oil quantity

Moebius A

Moebius F

Silicone Oil 500,000 c.s.

Normal quantity

* Do not disassemble the

buttons except when
they need to be replaced.

Case back

Case back gasket

Movement

Hour, and
minute
hands

Dial

Button spring clip

Piezoelectric element

Button D

Button C

Button B

Button A

6

7

1

2

4

5

Dial ring

Case ring

3

1

1

ed

ed

(AO-3)
(AO-2)

Cal. H024A

PARTS CATALOGUE

3/7

8

9

qa

qs

qd

qf

qg

q;

qh

qj

qk

w;

wa

wd

● For the parts , , , and , please see the remarks on the following pages.

ql wd e;8q;

Battery connection (–)
4270 380

Buzzer lead terminal
4246 368

Dial washer
0491 233

Insulator for circuit block
4216 366

Connector guard
4398 371

Connector guard screw
0012 316

Connector
4313 366

Liquid crystal panel

Liquid crystal panel frame
4540 366

0012 316

• Connector guard screw
(2 pcs.)

0012 168

• Switch spring screw
(2 pcs.)

• Train wheel bridge
screw(1 pc.)

• Coil block screw
(1 pc.)

Battery
(See the front page.)

Switch spring screw
0012 168

Train wheel bridge screw
0012 168

Train wheel bridge
0125 366

Intermediate center wheel
and pinion (B) 0817 155

Step rotor
4146 154

Coil block screw
0012 168

Coil block (B)
4002 366

Coil lead terminal
4246 367

Center wheel and pinion

Intermediate center wheel
and pinion (A)
0817 154

Hour wheel

Minute wheel and pinion
0261 380

ws

Main plate

Switch spring

Rotor stator (B)
4239 454

wf

wg

wh

wj

wk

wl

ea

es

ed

e;

ql

Circuit block
4004 139

0100 366