Seiko 7N35C Quick start guide

ø24.0mm

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

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

ø23.3mm

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

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

Cal. 7N35C

Cal. 7N36C

PARTS CATALOGUE /TECHNICAL GUIDE

[SPECIFICATIONS]

7N35C

Cal. No.

Item

Movement

7N36C

The illustrations refer to Cal. 7N36C. (x 1.0)

Outside diameter

Casing diameter

Height 2.78mm

Movement size

Time indication 3 hands

Driving system Step motor (Load compensated driving pulse type)

Additional mechanism Date calendar

_Day calendar

Jewels 1 jewel

SEIKO SR920SW, Maxell SR920SW, SONY SR920SW,

Matsushita SR920SW, EVEREADY 371

Battery life is approximately 4 years.

Voltage: 1.55V

Battery

Measuring gate by quartz tester Use 10-second gate.

Regulation system Nil

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

Battery life indicator

Electronic circuit reset switch

Train wheel setting device

Instant setting device

for day calendar

Instant setting device for date calendar

Cal. 7N35C, 7N36C

PARTS CATALOGUE

Ex. : Cal. 7N36C

➡➡Please see the remarks on the following pages.

Disassembling procedures Figs. : 1 →37

Reassembling procedures Figs. : 37 →1

Lubricating: Types of oil Oil quantity

Moebius A Normal quantity

0022 247

• Battery connection

(+) screw (2 pcs.)

• Coil block screw (1 pc.)

15 0022 247

Battery connection

(+) screw

1 Hour, minute and

second hands

13 0802 890

Date driving wheel

11 0962 891

Second intermediate wheel

for calendar correction

12 Hour wheel

10 0737 891

Date corrector setting wheel

9 0810 890

Date jumper

8 Date dial

7 0808 890

Date dial guard

6 0989 890

(only for Cal. 7N36C)

Intermediate wheel for

day correction

5 Day star with dial disk

(only for Cal. 7N36C)

4 0963 230

(only for Cal. 7N36C)

Snap for day star

with dial disk

3 0419 735

Dial washer

2 Dial

14 Battery

(See the front page.)

24 0281 904

Setting wheel

23 0261 904

Minute wheel

22 4146 886

Step rotor

21 0701 904

Fifth wheel and pinion

20 0231 904

Third wheel and pinion

19 Fourth wheel and pinion

18 0125 923

Train wheel bridge

17 4000 634

Circuit block

16 Battery connection (+)

25 0391 890

Train wheel setting lever

26 0022 247

Coil block screw

27 4002 923

Coil block

28 4239 892

Rotor stator

29 0383 891

Setting lever

30 0384 890

Yoke

31 Winding stem

32 0282 890

Clutch wheel

33 0962 890

First intermediate wheel

for calendar correction

34 Center wheel and pinion

35 4216 904

Insulator for battery

connection C

36 4270 904

Battery connection (–)

37 Main plate

Cal. 7N35C, 7N36C

Remarks:

PARTS CATALOGUE

12 Hour wheel

19 Fourth wheel and pinion

34 Center wheel and pinion

37 Main plate

Height

Numeral for

discrimination

Discrimi-

nation

Standard type

Dial MovementPrinted on

Ex) Standard type Ex) Standard type

The numeral is printed at the

right end. The numeral is printed below

the calibre number.

Printed position

•Discrimination of the hand installation height

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.

Combination:

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

the table below.

Hour wheel

0271 934 0100 9430241 9340221 939

Main plate

(Center pipe)

Fourth wheel

and pinion

Center wheel

and pinion

Numeral for

discrimination

TECHNICAL GUIDE Cal. 7N35C, 7N36C

Cal. 7N35C, 7N36C

PARTS CATALOGUE

31 Winding stem 0351 892

The type of winding stem is determined based on the design of cases.

Check the case number and refer to “SEIKO Casing Parts Catalogue” to choose a corresponding

winding stem.

16 Battery connection (+) 4268 620

The battery connection (+) we are supplying has no calibre number nor numeral printed on it for

discriminating the hand installation height.

•The explanation here is only for the particular points of Cal. 7N35C and 7N36C.

•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

Coil output terminal

Cal. 7N35C, 7N36C

Tweezers

II. REMARKS ON DISASSEMBLING AND REASSEMBLING

Use the universal movement holder for disassembling and reassembling.

1 Hands

•How to install

When installing the hands, remove the battery and

place the movement directly on a flat metal plate or

the like.

6 Intermediate wheel for day correction (only for Cal. 7N36C)

Set the intermediate wheel for day correction in the

direction as shown in the illustration at right.

Main plate side

Dial side

7 Date dial guard

Unlike conventional movements, the date dial guard is not fixed with screws. It is set to the main

plate with the three protrusions, which are caught under the main plate by turning the guard. Then,

it is fixed by the two guide pins.

•How to remove

1) Lightly lift the A portion of the date dial guard

with tweezers to release it from the guide pin,

and then move it in the counterclockwise

direction until it gets on the guide pin.

2) Release the B portion of the date dial guard in

the same way as described above, and then

move it in the counterclockwise direction until

it gets on the guide pin.

3) Check that all the three protrusions of the date

dial guard have come off from the main plate,

and then remove the date dial guard.

TECHNICAL GUIDE

A portion

Guide pin

Protrusion

B portion

Date dial guard

Metal plate

•How to install

Cal. 7N35C, 7N36C

1) Put the date dial guard on the main plate

so that the A and B portions are over the

guide pins, as shown in the illustrations at

right.

2) Move the protrusion D of the date dial

guard in the clockwise direction so that it

is caught under the main plate.

3) Slightly move the protrusions C and E in

the clockwise direction alternately to set

them under the main plate. Then, set the

A and B portions of the date dial guard to

the guide pins.

4) Check that the date dial guard is fixed

securely to the main plate.

14 Battery

•How to install

Insert the battery aslant from the direction shown by the

arrow.

15 Battery connection (+) screw

Fasten the screw on the crystal unit side while holding down

the edge of the crystal unit.

16 Battery connection (+)

•How to install

Have the hooking portion (2 places) catch the main plate.

In disassembling and reassembling, take care not to deform

the hooking portions.

After installing the battery connection (+), check that the two

hooking portions securely catch the main plate.

TECHNICAL GUIDE

Protrusion D

Protrusion C

B portion

Protrusion E

A portion

Cal. 7N35C, 7N36C

Winding stemClutch wheel

First intermediate wheel for

calendar correction

Note: Take care not to deform the spring portion of the yoke.

18 Train wheel bridge

•Setting position

Refer to the illustration at right.

25 Train wheel setting lever

29 Setting lever

30 Yoke

•Setting position

TECHNICAL GUIDE

Note: Take care not to damage the wheels made of plastics in disassembling and reassembling.

Refer to the illustrations below.

Center wheel and

pinion

Minute wheel

Fifth wheel and pinion

Step rotor

Third wheel and pinion

Setting wheel

Fourth wheel and pinion

31 Winding stem

The first intermediate wheel for calendar correction has

some elasticity in the contact with the winding stem so

that it can be easily fixed.

Push in the winding stem straight toward the center of

the main plate.

Setting wheel

Minute wheel

Third wheel

and pinion

Fourth wheel

and pinion

Fifth wheel

and pinion

Step rotor

Setting lever

Train wheel setting lever

Yoke

TECHNICAL GUIDE

III. VALUE CHECKING

•Coil block resistance

Cal. 7N35C, 7N36C

1.18KΩ~ 1.58KΩ

•Current consumption

For the whole movement : less than 1.20µA

For the circuit block (4000 634) alone : less than 0.28µA

Remarks: When the current consumption exceeds the standard value for the whole movement

but within the standard value range for the circuit block alone, the watch is generating

the driving pulse for compensating for the heavy load that may be applied to the gear

train, etc.

In this case, overhaul and clean the movement parts and then measure current consumption

for the whole movement again.

95-3 Printed in Japan

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