Seiko 7N32C, 7N33C, 7N39C Technical Manual

1

PARTS CATALOGUE / TECHNICAL GUIDE

Cal. 7N32C
Cal. 7N33C
Cal. 7N39C

[SPECIFICATIONS]

Cal. No.

Item

7N32C

Movement

ø24.0 mm

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

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

The illustrations refer to Cal. 7N33C.

7N39C

Outside diameter

(x 1.0)

7N33C

ø23.3 mm

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

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

Casing diameter

Movement size

2.57 mm

Height

Time indication 3 hands

Driving system

Step motor (Load compensated driving pulse type)

Additional mechanism

2.78 mm

Day calendar

Instant setting device
for day calendar

_

_

Loss/gain

Monthly rate at normal temperature range: less than 15 seconds

Regulation system

Nil

Measuring gate by quartz tester

Use 10-second gate.

Battery

SEIKO SR920SW, Maxell SR920SW, Sony SR920SW,
Matsushita SR920SW, Eveready 371
Battery life is approximately 5 years.
Voltage: 1.55V

2 hands

2.57 mm

_

_

_

_

Jewels

1 jewel

Date calendar
Instant setting device for date calendar

Train wheel setting device
Electronic circuit reset switch
Battery life indicator

2

Cal. 7N32C, 7N33C, 7N39C

PARTS CATALOGUE

Please see the remarks on the following pages.

15 Battery connection (+)

18 Fourth wheel and pinion

0022 247

• Battery connection (+)
screw (2 pcs.)

• Coil block screw (1 pc.)

Disassembling procedure Figs. : 1 → 36
Reassembling procedure Figs. : 36 → 1

Lubricating: Types of oil Oil quantity

Moebius A Normal quantity

Ex. : Cal. 7N33C

1 Hour, minute and

second hands
(Cal. 7N32C, 7N33C)
Hour and minute hands
(Cal. 7N39C)

2 Dial

3 0963 230 (Cal. 7N33C)

Snap for day star
with dial disk

4 0150 515 (Cal. 7N33C)

Day star with dial disk

5 0989 890 (Cal. 7N33C)

Intermediate wheel
for day correction

13 Battery

(See the front page.)

14 0022 247

Battery connection (+)
screw

17 0125 923

Train wheel bridge

16 4000 634

(Cal. 7N32C, 7N33C)
4000 633 (Cal. 7N39C)
Circuit block

19 0231 904

Third wheel and pinion

20 0701 904

Fifth wheel and pinion

21 4146 886

Step rotor

22 0261 904

Minute wheel

23 0281 904

Setting wheel

24 0391 890

Train wheel setting lever

26 4002 923

Coil block

33 Center wheel and pinion

35 4270 904

Battery connection (-)

34 4216 904

Insulator for battery
connection C

32 0806 890

(Cal. 7N32C, 7N39C)
Date corrector wheel

32 0962 890 (Cal. 7N33C)

First intermediate wheel
for calendar correction

31 0282 890

Clutch wheel

29 0384 890

Yoke

28 0383 891

Setting lever

27 4239 892

Rotor stator

30 Winding stem

8 0810 890

Date jumper

9 0737 891 (Cal. 7N33C)

Date corrector setting
wheel

10 0962 891 (Cal. 7N33C)

Second intermediate
wheel for calendar
correction

7 0878 579 (Cal. 7N32C)

0878 643 (Cal. 7N33C)
0878 633 (Cal. 7N39C)
Date dial

25 0022 247

Coil block screw

36 Main plate

6 0808 890 (Cal. 7N33C)

0808 891

(Cal. 7N32C, 7N39C)

Date dial guard

11 Hour wheel

12 0802 890 (Cal. 7N33C)

0802 891
(Cal. 7N32C, 7N39C)
Date driving wheel

3

Cal. 7N32C, 7N33C, 7N39C

PARTS CATALOGUE

Remarks:

11 Hour wheel

18 Fourth wheel and pinion

33 Center wheel and pinion

36 Main plate

• Discrimination of the hand installation heights

Cal. 7N Series watches have numerals printed on the dial and the movement to indicate the hand
installation heights. When repairing, refer to the table below.

Discrimi-

nation

Printed on Dial Movement

Numeral for

discrimination

Height Short type

1

Standard type

2

Ex) Standard type

Ex) Standard type

Printed position

The numeral is printed at
the right end.

The numeral is printed
below the calibre number.

Combination:

* The hand installation heights can be discerned from the shape of the following parts. Refer to the table

below.

[Cal. 7N32C]

Numeral for

discrimination

1

2

Center wheel

and pinion

0271 929

Hour wheel

0221 904 0241 904 0271 942 0100 942

Main plate

(Center pipe)

Fourth wheel

and pinion

0100 941

0241 929

0221 929

JAPAN 7N33-5A00 R2