Seiko 7N32C Quick start guide

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

4
Cal. 7N32C, 7N33C, 7N39C
PARTS CATALOGUE
[Cal. 7N33C]
Numeral for
discrimination
2
Center wheel
and pinion
0271 934
Hour wheel Main plate
(Center pipe)
Fourth wheel
and pinion
0100 943
0241 934
0221 934
[Cal. 7N39C]
Numeral for
discrimination
1
2
Center wheel
and pinion
0271 929
Hour wheel
0221 904 0241 941 0271 942 0100 942
Main plate
(Center pipe)
Fourth wheel
and pinion
0100 9410241 940
0221 929
15 Battery connection (+) 4268 620
Note: The battery connection (+) we are supplying has no calibre number nor numeral printed on it for
discriminating the hand installation height.
30 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.

5
Cal. 7N32C, 7N33C, 7N39C
TECHNICAL GUIDE
•The explanation here is only for the particular points of Cal. 7N32C, 7N33C and 7N39C.
•For the repairing, checking and measuring procedures, refer to the “TECHNICAL GUIDE, GENERAL
INSTRUCTIONS”.
I. STRUCTURE OF THE CIRCUIT BLOCK
Note:
Though Cal. 7N32C, 7N33C and 7N39C have the
same circuit block pattern, Cal. 7N39C is not
provided with the battery indicator function. The
circuit block of Cal. 7N39C has an identification
mark as shown below to distinguish it from the
circuit blocks of Cal. 7N32C and 7N33C.
Identification mark
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.
Coil output terminal
Input terminal (+)
Input terminal (-)
Crystal unit C-MOS-IC
Metal plate

6
Cal. 7N32C, 7N33C, 7N39C
TECHNICAL GUIDE
5 Intermediate wheel for day correction (only for Cal. 7N33C)
Set the intermediate wheel for day correction in the direction as
shown in the illustration at right.
Tweezers
Guide pin
Date dial guard
6 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.
•How to install
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.
Protrusion C
Protrusion E
A portion
B portion Protrusion D
B portion
Protrusion
A portion
Dial side
Main plate side

7
Cal. 7N32C, 7N33C, 7N39C
TECHNICAL GUIDE
13 Battery
•How to install
Insert the battery aslant from the direction shown by the
arrow.
Fasten the screw on the crystal unit side while holding down
the edge of the crystal unit.
15 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.
17 Train wheel bridge
•Setting position
Refer to the illustrations below.
Setting wheel
Minute wheel
Fifth wheel and pinion
Step rotor
Third wheel and pinion
Setting wheel
Fourth wheel and pinion
Note: Take care not to damage the wheels made of plastics in disassembling and reassembling.
14 Battery connection (+) screw
Center wheel and
pinion
Third wheel
and pinion
Fourth wheel
and pinion
Step rotor
Fifth wheel
and pinion
Minute wheel

8
Cal. 7N32C, 7N33C, 7N39C
TECHNICAL GUIDE
Refer to the illustration at right.
24 Train wheel setting lever
28 Setting lever
29 Yoke
•Setting position
Setting lever
Yoke
Train wheel setting lever
Note: Take care not to deform the spring portion of the yoke.
30 Winding stem
The first intermediate wheel for calendar correction (Cal.
7N33C) or the date corrector wheel (Cal. 7N32C and 7N39C)
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.
Winding stemClutch wheel
First intermediate wheel for calendar
correction (Cal. 7N33C)/
Date corrector wheel (Cal. 7N32C, 7N39C)
III. VALUE CHECKING
•Coil block resistance
1.18KΩ~ 1.58KΩ
•Current consumption
For the whole movement : less than 1.20µA
For the circuit block 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