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SEIKO Automatic Open-heart Cal 4R38A and 4R39A have been developed based on the Cal 4R36A Following parts are determined based on the design of watches, such as hands height, dial color, and design of cases (4R39 only)



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[PDF] PARTS LIST / TECHNICAL GUIDE - Seiko USA Service Center

SEIKO Automatic Open-heart Cal 4R38A and 4R39A have been developed based on the Cal 4R36A Following parts are determined based on the design of watches, such as hands height, dial color, and design of cases (4R39 only)



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PARTS LIST / TECHNICAL GUIDE

4R38A/4R39A

4R38A4R39A

Movement size

Outside diameterØ 27.4 mmØ 27.4 mm

Casing diameterØ 27.0 mmØ 27.0 mm

Height5.32 mm5.32 mm

Driving systemAutomatic winding with manual winding mechanism

Time indication

Hour, Minute, and Small second hands)

(Hour, Minute, and Second hands)

Additional function

Crown operation

Vibration per hourMovement size

Outside:

Ø 27.4 mm

Casing:

Ø 27.0 mm

hour, minute and second hands)

Automatic Open-heart Cal. 4R38A/4R39A

[SPECIFICATIONS] Item

Cal. No.

Loss/Gain

t he wrist at range between 5 °C and

35 °C)Between +45 and -35 seconds

m easurement

T0 (CH)

T24 (CH)

Measurement

se conds: s/d)

± 20 s/d± 30 s/d± 30 s/d(Isochronism

± 3

0 s/d

Regulation system

Lift angle of the escapement53 °

Power reserve

Number of jewels24 jewels (the figures below are Cal. 4R39A.)

Cal. 4R38A/4R39A

PARTS LIST

2/20 SeiKO Automatic Open-heart Cal.4R38A and 4R39A have been developed based on the Cal.4R36A. the movement is both automatic and hand-winding with a power reserve of 41 hours. t he heart of the movement with its gold plated balance wheel is visible through the dial at the nine o'clock position, and the whole movement, with its specially engraved rotor, can be seen through the see-through case back. the three time-of-day hands are complemented by a 24-hour hand set into a subdial at the 11 o'clock position (Cal. 4R39A only).

Fea tURes

Ch aRaCteRistiCs oF a meChaniCal WatCh

1. th is mechanical watch operates using power obtained from a mainspring.

2. W hile loss/gain of a quartz watch is indicated by a monthly or annual rate, accuracy of a m echanical watch is normally indicated by a daily rate (loss/gain per day). 3. N ormal usage accuracy of a mechanical watch varies according to conditions of use (time p eriod that the watch is worn on the wrist, temperature environment, hand movement, and w inding state of the mainspring). 4. W hen the watch is affected by strong magnetism, it temporarily gains or loses time. if the w atch encounters a strong magnetic field, the parts of the watch may be magnetized. in this c ase, repairs such as removal of magnetism are required.

Cal. 4R38A/4R39A

PARTS LIST

3/20

ˠPlease refer to the following pages.

Lubricating:

types of oil Oil quantity

AO-3 (Moebius A)

Liberal quantity

SeiKO Watch Oil S-6 Normal quantity

SeiKO Watch Oil S-4

Disassembling procedures Figs. : 1 45

Reassembling procedures Figs. : 45 1

[TRAIN WHEEL MECHANISM]

2 hoUR Wheel gUaRd sCReW

0012354

3 hoUR W h eel gUaRd

0376184

4 hoUR W h eel

0273183 (

C al.4 R 38
a

0273185 (

C al.4 R 39
a 5 inteRmed i ate 24 h oUR W h eel and P i n i on

0817300 (

C al.4 R 39
a onlY) 6 24
h oUR W h eel

0157184(

C al.4 R 39
a onlY) 7 mi nUte W h eel and P i n i on

0261183

8 C annon P i n i on

0225 414 (

C al.4 R 38
a

0225 417 (

C al.4 R 39
a di sassemble a FteR C enteR Wh eel)

9 dial holding sPaCeR

4408***

loWeR shoCk absoRb i ng sPR i ng loWeR s h oCk absoRb i ng CaP JeWel loWeR h ole JeWel FRame FoR s h oCk-absoRbeR0014 577

0011 220

0014 295

16-6 16-5 16-7 *1 *2*2 *1

Cal. 4R38A/4R39A

PARTS LIST

4/20

ˠPlease refer to the following pages.

L ubricating: t ypes of oil A

O-3 (Moebius A)

S eiKO Watch Oil S-6 S eiKO Watch Oil S-4 [BALANCE AND ESCAPEMENT]

15 balanCe bRidge

sCReW

0012 420

balanCe

ComPlete W

i t h stUd

0310 198

UPPeR s

h oCk absoRb i ng sPR i ng UPPeR h ole JeWel

FRame FoR s

h oCk- absoRbeRUPPeR s h oCk absoRb i ng CaP

JeWel11

aUtomatiC tRain bRidge

0191 183

12 seCond RedUCt i on W h eel and P i n i on

0514 183

13 Ra tC h et W h eel sCReW

0012 919

14 Ra tC h et Weel

0285 051

17 P allet bR i dge sCReW

0012 354

18 P allet bR i dge

0161 300

19 P allet FoRk

0301 00910

aUtomatiC tRain bRidge sCReW

0012 354

1

1 osCillating Weight With ball beaRing

R efer to se i ko W eb P arts C atalogue.

0509***

16 balanCe CoCk

0171 353

16-2 16-3 16-4 16-1 *1*1 *2 *2 *3 *3

Cal. 4R38A/4R39A

PARTS LIST

5/20

ˠPlease refer to the following pages.

Lubricating:

types of oil

AO-3 (Moebius A)

SeiKO Watch Oil S-6

SeiKO Watch Oil S-4

[WINDING MECHANISM]

20 baRRel and tRain

W h eel bR i dge sCReW

0012 420

CaP JeWelled sPR

i ng

0015 703

CaP JeWel

0011 221

23
sl i d i ng

CRoWn W

h eel sPR i ng

0363 183

22
baRRel and tRa i n W h eel bR i dge W i t h h ole JeWel FRame

0114 183

27
loWeR Pla te FoR baRRel and tRa i n W h eel bR i gde

0436 164

30
t hi Rd W h eel and P i n i on

0231 07028

loWeR Pla te FoR baRRel and tRaquotesdbs_dbs35.pdfusesText_40