Seiko 7T32B User manual

EMMY WATCH
VINTAGE RESTORATIONS
Seiko 7T32B,7T42B Movement Parts (1)
Compiled by EmmyWatch - htips://www.emmywatch.com

PARTS CATALOGUE /TECHNICAL GUIDE
[SPECIFICATIONS]
Cal. 7T32B
Cal. 7T42B
Cal. No.
item
7732B | 7T42B
Movement
The illustrations refer to Cal. 7T32B.
{x 1.0)
Movement size
Outside diameter, g27.6mm
24.0mm between 3 o’clock and 9 o’clock sides
Casing diameter | 827.0mm
24.0mm between 3 o'clock and 9 o‘clock sides
Height 3.2mm
Time indication Main time Stopwatch Alarm Timer (for Cal. 7T42B}
Hour, minute | Minute and | Small hour and | Minute and second hands
and small 1/5-second | minute hands (Stopwatch 1/5-second
second hands} hands and minute hands)
Driving system
Step motor, 4 pieces
Additional mechanism
* Electronic circuit reset switch
* Train wheel setting device
+ Battery life indicator (Small second hand moves at two-second intervals.)
e Date calendar
* Instant setting device for date calendar
* Stopwatch function (Up to 30 minutes in 1/5 seconds)
« Accumulated elapsed time measurement
« Split time measurement
* Timer function (Up to 60 minutes in minutes)
* Alarm function (12-hour indication system}
* Alarm test system
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 SR927W, Maxell SR927W, SONY SR927W, EVEREADY 399
Battery life is approximately 2 years.
Voltage: 1.55V
Jewels 0 jewel
SEIKO CORPORATION

PARTS
CATALOGUE
Cal.
77328,
7T42B
Disassembling procedures Figs. : @ > ®
Reassembling procedures Figs. : © > ®
Lubricating: Types of oil Oil quantity
@@
Moebius
À
OC
Normal
quantity
OC>
SEIKO Watch
Oil
S-6
C>
Extremely
small
OC> Silicone Oil 500,000 c.s.
4589 801
Piezoelectric element
\
N
HO Case back
[gr
À
NO) Case back gasket
Case ring (Cal. 7T32B)
aD Stopwatch second
hand/Timer minute
hand
Antimagnetic
shield
plate
(B}
L®
Minute
hand
(Cal,
77428}
7
1 Hour hand
Button C ”” P a
Ove E ——® Small second hand
A sea ei
RP ® Button spring clip ' #«——® Stopwatch minute
H hand/Timer second
Button B
hand
Alarm minute hand
Alarm hour hand
Dial
(10) Winding stem
Button A
Button spring
Holding ring for dial
O > Please see the remarks on the following pages.

Cal. 7T32B, 7T42B
027 973
Pin for date dial guard
808 580
Date dial guard
878 527
Date
dial
962 580
Intermediate wheel
for calendar correction
737 580
Date corrector setting
wheel
802 580
Date driving wheel
271 583
Hour wheel for alarm
Hour wheel
240 580
Small second wheel
885 590 — ——Ö ———Ä-
First intermediate wheel
for second-counting
950 590 ——
Intermediate minute-
counting wheel
902 580
Minute-counting wheel
950 590-
Intermediate alarm wheel \ 5
270580 ————_
Center minute wheel
@60
©
©®
for alarm
261582
i
Minute wheel for alarm nn
281582 —— 7 eus
Setting wheel for alarm
T1 022 230
Battery clamp screw
= 022 459
| | Circuit block cover screw
O = Please see the remarks on the following pages.
022 230
Battery clamp screw
4225 714 (Cal. 77328}
4225 716 (Cal. 7T42B}
Battery clamp
Battery
{See the front page.)
022 459
Circuit block cover screw
4457 728
Circuit block cover
396 580
Friction spring for
second-counting
4000 710 (Cal. 7T32B)
4000 712 (Cal. 7T42B)
Circuit block
4246 700
Buzzer lead terminal
4270 710
Battery connection (~}
027 974
Pin for train wheel
bridge
125 590
Train wheel bridge
Second-counting wheel
4283 581
Spacer for center wheel
and pinion
241583
Fourth wheel and pinion
231580
Third wheet and pinion
701 580
Fifth wheel and pinion
885 591
Second intermediate wheel
for second-counting
261 580
Minute wheel
281 580
Setting wheel

ii J
PARTS CATALOGUE
Cal. 7T32B, 7T42B
4146 710
Step rotor è
4146 —
Chronograph rotor for second
4146 710
Alarm rotor
@ 4146 710 ANE
Chronograph rotor for minute
4002 700
Coil block
4002 700
Coil block for chronograph second
A002 711 —
Coil block for chronograph minute
O
>
Please
see
the
remarks
on
the
following
pages.
4002 711
Coil block for alarm
4450 710
Switch lever A
383 591
Setting lever for alarm
383 592
Setting lever
351 580
Winding stem for alarm
282 582
Clutch wheel for alarm
384 580
Yoke
351 580
Winding stem
282 580
Clutch wheel
391 591
Train wheel setting lever
4239 710
Rotor stator
4239 711
Rotor stator for chronograph second
4239 712
Rotor stator for alarm
4239 713
Rotor stator for chronograph minute
Center wheel and pinion
4450 702
Switch lever C
4450 701
Switch lever B
100 590
Main plate

PARTS
CATALOGUE
Cal.
77328,
7T42B
Remarks:
Holding ring for dial
The
type
of
holding
ring
for
dial
is
determined
based
on the
design
of
cases.
Check
the
case
number
and
refer
to
“SEIKO
Casing
Parts
Catalogue”
to
choose
a
corresponding
holding
ring for dial.
60 Pin for date dial guard
@ Pin for train wheel bridge
For
distinction
between
the
pins,
see
the
illustration
below.
[Pin for date dial guard} [Pin for train wheel bridge]
027 973 027 974
@
Date
dial
878
527
(Black
figures
on
white
background)
The
type
of
date
dial
is
determined
based
on
the
design
of
cases.
Check
the
case
number
and
refer
to
“SEIKO
Casing
Parts
Catalogue”
to
choose
a
corresponding
date
dial.
© Hour wheel
@ Second-counting wheel
Gs Center wheel and pinion
Combination
Parts
name
;
Type*
Hour
wheel
Second-counting
wheel
|
Center
wheel
and
pinion
LAS
i
——a
A
u
al
So
==
—s,
i
4
i
271
580
888
580
221
580
-
Ÿ
’
ZZ
!
M
A
===
i
i
271588
888
582
221
583
… Short type
*Abbreviation A
.. Standard type
{Movement type}

PARTS CATALOGUE Cal. 7T32B, 7T42B
63 Circuit block
To
identify
the
circuit
blocks
for
respective
calibres,
check
the
holes
on
the
pattern
as
shown
in
the
illust-
rations.
Cal. 7T32B Cal. 7T42B
x
è
N
_ ldenufication
LB hole
We
@ Winding stem for alarm
© Winding stem
The type of winding stem for alarm and winding siem are determined based on the design of cases.
Check the case number and refer to “SEIKO Casing Parts Catalogue” to choose a corresponding winding
stem.

TECHNICAL GUIDE
* The explanation here is only for the particular points of Cal. 7T32B and 7T42B.
e
For
the
repairing,
checking
and
measuring
procedures,
refer
to
the
“TECHNICAL
GUIDE,
GENERAL
INSTRUCTIONS”.
I. STRUCTURE OF THE CIRCUIT BLOCK
Output terminal
Upconverter coll
‘Output terminal
Il. REMARKS ON INSTALLING THE BATTERY
* A necessary step after installing the battery
»
After
the
battery
is
replaced
with
a
new
one,
or
after
the
battery
is
re-installed
following
the
repairing
procedures,
be
sure
to
short-circuit
the
AC
terminal
and
the
circuit
block
cover
with
tweezers
to
reset
the
circuit
as
shown
in
the
illustration
below.
/
Tweezers
* After resetting the circuit, be sure to reset the stopwatch hands to the 12 o'clock position.
1) Pull out the crown at the 3 o'clock side to the
second click.
2) Press button “B” to reset the stopwatch second N
hand to “0”. Button © 7
3) Press button “A” to reset the stopwatch minute /
hand to “0”. |
* With each press of buttons “B” and “A”, the ARAN
stopwatch second and minute hands move 0.2 Button ON
seconds and 0.5 minutes, respectively. They
move automatically while the buttons are kept
pressed and stop when they are released.
Cal. 7T32B, 7T42B

TECHNICAL GUIDE Cal. 7T32B, 7T42B
I. REMARKS ON DISASSEMBLING AND REASSEMBLING
@ Winding stem with crown for alarm
Winding stem with crown
* How to remove
* Winding stem with crown at the 3 o'clock side:
Pull out the crown to the first click, and then push the setting lever by inserting the tip of tweezers
into hole “A” in the illustration below.
* Winding stem with crown for alarm at the 4 o'clock side:
Pull out the crown for alarm to the first click, and then push the setting lever for alarm by inserting
the tip of tweezers into hole ”B” in the illustration below.
SEIKO TIME
A corp
UnaDJUSTED
* Remarks on setting the winding stems
The winding stems at the 3 o’clock and 4 o’clock sides can be used interchangeably. However, note
that the type of crown differs depending on the length of winding stem and the design of cases.
@ Stopwatch second hand
@® Stopwatch minute hand
* Remarks on installing
When
installing
those
stopwatch
hands,
check
that
they
accurately
point
to
the
stopwatch
scales
on
the
dial.
© Stopwatch second hand
* Remarks on installing
After installing the hands, check that there is a proper clearance between the stopwatch second hand
and other hands.
Dial
* Remarks on installing
When installing the dial, make sure that its center is securely set at the proper position.

TECHNICAL
GUIDE
Cal.
7732B,
7T42B
@ Pin for date dial guard
* How to remove * How to install
1) Turn the pins 90° counterclockwise to loosen 1) Set the pins properly into the grooves.
them using a screwdriver. ; ; A
2) Turn the pins 90° clockwise using a screw-
2) Pick up the pins using rodico. driver to fix them.
Notes: + Never turn the pins more than 90° clockwise or counterclockwise.
* Never apply undue force to the pins in turning them using a screwdriver.
* Be sure to use a screwdriver that fits in with the slot of the pin head.
* Lubricating
Lubricate the date jumper and the tips of the date dial
as
shown in the illustration.
Moebius A
@ Hour wheel
* Remarks on installing
When installing the hour wheel, be sure to engage it securely with the pinion of the minute wheel.
és Battery clamp
* How to install
Set the battery clamp securely to the guide tube,
taking care not to press down the protruded
portion of the circuit block cover.
(er) Battery
* Remarks on installing
After installing the battery, be sure to reset the circuit
with tweezers as shown in the illustration.

TECHNICAL GUIDE Cal. 7T32B, 7T42B
@ Circuit block cover
* How to remove
1) Loosen the four screws and remove
them.
2) Release the click portion of the alarm
yoke. -
3) Release the three hooking portions of A i)
the circuit block cover by prying them ~ a =
up with the tip of a screwdriver as =
shown in the illustration at right.
* [Installing and lubricating
1) Set the hooking portion ©)
2) Check that the circuit block cover is
securely set to the guide tube {a} and
(b).
3) Set the hooking portions in the order
of and @ in the illustration,
4) Tighten the screw (c).
5) Hook the alarm yoke spring (d).
6) Tighten the other three screws.
7) Lubricate the click portion ofthe alarm
yoke.
@ Friction spring for second-counting
Slip the friction spring for second-
counting into the gap under the train
wheel bridge.
* Setting position
Circuit block
* How to instali
Set the guide holes (a ~ f in the illustration) of
the circuit block securely onto the corresponding
collars of the train wheel bridge.
10

TECHNICAL
GUIDE
Cal.
7T32B,
7T42B
@ Pin for train wheel bridge
* How to remove
Turn the pins 90° counterclockwise to loosen them, and pick them up using rodico.
* How to install
Set the pins properly into the groove as shown in the illustration, and turn them 90° clockwise with a
screwdriver to fix them.
& Rodico
Notes: » Never turn the pins more than 90° clockwise or counterclockwise.
+ Never apply undue force to the pins in turning them using a screwdriver.
+ Be sure to use a screwdriver that fits in with the siot of the pin head.
* Lubricating of the upper pivots for wheels and rotors
After
installing
the
train
wheel
bridge,
lubricate
the
step
rotor,
chronograph
rotor
for
minute,
alarm
rotor,
chronograph
rotor
for
second,
minute
wheel,
center
minute
wheel
for
alarm,
second-counting
wheel,
minute-counting
wheel
and
small
second
wheel.
Train wheel bridge
* Remarks on installing
* Before installing the train wheel bridge, check if the wheels are set in the proper position, referring
to the photograph below. Also, check their lower pivots are securely set in the axle holes.
11

TECHNICAL
GUIDE
Cal.
7T32B,
7T42B
Notes:
+
If
the
upper
pivots
cannot
be
set
smoothly
into
the
train
wheel
bridge,
remove
the
train
wheel
bridge,
check
if
the
lower
pivot
of
each
wheel
is
set
in
the
axle
hole,
and
then
set
the
train
wheel
bridge
again.
*Do
not
press
down
the
train
wheel
bridge
forcibly
as
the
axles
of
plastic
wheels
may
be
broken
or
be
bent.
+
Note
that
some
of
the
axle
holes
are
not
used,
depending
on
calibres.
For
Cal.
7T32B
and
7T42B,
the
axle
holes
indicated
in
the
illustration
are
not
used.
These axte holes are not used
for Cal. 7T32B and 7T42B
Second-counting wheel ~ @ Setting wheel for alarm
After disassembling the wheels and rotors, arrange them as indicated in the illustration below to facilitate
the
reassembling
procedures.
However,
the
rotors
should
be
kept
separately
from
each
other,
as
they
emit magnetism.
[Reassembling procedures]
* Reassemble the parts below in the following order.
*
The
reassembling
order
shown
below
is
different
from
the
one
in
the
exploded
view
on
pages
3
and
4.
[1] 281 sso 4146 710
Setting
wheel
(Metal:
silver)
Chronograph
rotor
for
second
(Plastic:
white)
261
580 885
591
|
Minute
wheel
(Plastic:
white}
Second
intermediate
wheel
for
second-counting
[5] 281 582 (Plastic: green)
Setting
wheel
for
alarm
(Metal:
silver}
885
590
;
A
[4]
261
582
First
intermediate
wheel
for
second-counting
Minute wheel for alarm (Plastic: white) (Plastic: white)
[5] su 7 SS er (Poste: vita)
Alarm rotor (Plastic: white) or (Flastic: whi
[6] 270 580 [15] 701 580
ÿ Center minute wheel for alarm (Metal: gold) WA and pinion (Plastic: green)
950 590 Small second wheel (Metal:
: gold)
Intermediate alarm wheel (Plastic: white) 231 580
4146 710 Third wheel and pinion (Metal: gold}
Chronograph rotor for minute (Plastic: white) 241 583
[2] 902 580 Fourth whee! and pinion (Metal: gold}
Minute-counting wheel (Metal: gold) 4283 581
950 590 Spacer for center wheel and pinion (Metal: silver)
Intermediate minute-counting whee! (Plastic: white) 888 580
Second-counting wheel (Metal: gold)
12

TECHNICAL GUIDE Cal. 7732B, 7T42B
* Setting position
See the illustration below.
Do
This
axle
holo
(5]
4
for
a
1328
u
LI
and 7T42B
SI
BP A
pes f
&
y
Jas (a Le
A
(AN
1
This
axle
hole
is
©
x
'
i
_
NPA
À
oot
used
for
ALS
and
7T428.
éù
Reassembling Procedures Figs. : [+] ~
Notes:
1. The part code of the second-counting wheel differs depending on the
installing height of hands.
Installing height of hands Part code
Short type : 888 580
Standard type : 888 582

TECHNICAL
GUIDE
Cal.
7T32B,
7T428
2. The intermediate alarm wheel and the intermediate minute-counting wheel
can be used interchangeably.
3. To distinguish between the minute-counting wheel and the minute wheel
for alarm, note that the pinion gear of the minute wheel for alarm has teeth
on it.
4. The numerals inscribed on the main plate, rotor stator and plastic wheels
and pinions indicate the block No.
Teeth
Switch lever A ~ @ Train wheel setting lever
*
Setting
position
and
lubricating
Nal
TAT
=
=
Moebius
A
Vas
Center
wheel
and
pinion
A
e Lubricating a A
Lubricate the center wheel and pinion as shown in the illustration. BO
@ Switch lever C ~ Main plate
* Setting position Switch lever C
Switch lever B
Main plate
*
Lubricating
G
Switch
lever
axle
_Fe®
>
€
;
[ZY
Setting
wheel
axle
{ for switeh lever B )
and switch lever C
[1 Switch lever axle
{for switch lever A)
N I 2 Axle hole for step rotor
Axle hole for chronograph rotor for second
7) Axle of setting wheel for alarm
Axle hole for small second wheel 4p
Axle hote for minute-counting wheel
Axle hole for center minute wheel
for
alarm
Axle
hole
for
chronograph
rotor
for
minute
Axle hole for alarm rotor
14

TECHNICAL
GUIDE
Cal.
7732B,
7T42B
IV. VALUE CHECKING
* Coil block resistance
Coil block for alarm : 1.8KQ ~ 2.4KQ
Coil block for chronograph minute : 1.8KQ ~ 2.4KQ
Coil block for chronograph second : 1.7KQ ~ 2.3KQ
Coil block : 1.7KQ ~ 2.3KQ
* Upconverter coil resistance: 452 - 60Q
* Current consumption
Before measuring current consumption, be sure to reset the circuit.
* Refer to “A necessary step after installing the battery”.
For the whole of the movement
Time mode : less than 2.5uA
Stopwatch mode : less than 10.0pA
For the circuit block alone
Time mode : less than 1.81A
* Time accuracy
When measuring the accuracy, make sure that the crown for alarm (at the 4 o’clock side) is at the first
or second click position.
V. CHECKING OF THE FUNCTIONS
>, Button ®
Crown
/
WV
hor
Crown
for
alarm
* g-reset adjustment of the chronograph hands
1) Pull out the crown at the 3 o'clock side all the way to the second click.
2) Keep buttons “A” and “B” pressed at the same time for more than 1 second.
3) Press button “B” to reset the stopwatch second hand to “0”.
4) Press bution "A" to reset the stopwatch minute hand to “0”.
* With each press of buttons "B” and “A”, the stopwatch second and minute hands move 0.2 seconds
and 0.5 minutes, respectively. They move automatically while the buttons are kept pressed and
stop if they are released.
15

TECHNICAL
GUIDE
Cal.
7T32B,
7T42B
7
¢
Checking
of
the
stopwatch
function
i
1)
Push
back
both
crown
at
the
3
o'clock
side
and
crown
for
alarm
at
the
4
o’clock
side
in
to
the
normal
position.
2)
Press
button
“A”
repeatedly
to
check
if
the
stopwatch
hands
start
and
stop
with
each
press
of
the
button.
3)
Press
button
“A”
to
stop
the
stopwatch,
and
then,
press
button
“B”
to
check
if
the
stopwatch
second
and
minute
hands
reset
to
“0”
4)
Press
button
“A”
to
start
the
stopwatch
second
hand,
and
then,
press
button
“B”
to
check
if
the
stopwatch
second
hand
stops.
After
that,
press
button
"B”
again
to
check
if
the
stopwatch
second
a
hand
automatically
advances
the
time
elapsed
while
it
was
stopped
and
resumes
the
measurement.
*
if
the
crown
at
the
3
o’clock
side
is
pulled
out
all
the
way
to
the
second
click
while
the
stopwatch
is
in
use,
the
measurement
is
stopped
and
the
stopwatch
second
and
minute
hands
return
to
“o”.
However,
even
if
the
crown
is
pulled
out
to
the
first
click,
the
date
setting
will
be
made
possible
but
the
stopwatch
does
not
stop
measuring.
* Checking of the alarm function
1)
Pull
out
the
crown
for
alarm
all
the
way
to
the
second
click
and
check
if
the
warning
sound
beeps
for
one
second.
{The
warning
sound
indicates
that
the
designated
alarm
time
has
been
canceled.)
2)
Push
the
crown
for
alarm
in
to
the
first
click
from
the
second
click,
and
check
if
the
alarm
sounds
for
approximately
one
minute,
3)
Pull
out
the
crown
for
alarm
all
the
way
to
the
second
click
to
check
the
time
indicated
by
the
alarm
hands,
and
then
push
it
in
to
the
first
click.
By
doing
so,
the
beeping
sound
continues.
Press
button
“C”
to
stop
it.
4)
Press
button
“C”
again
to
advance
the
alarm
hands
one
minute
ahead
of
the
time
you
have
checked.
5)
Check
if
the
alarm
rings
after
one
minute
for
20
seconds
and
stops.
*
The
alarm
is
engaged
when
the
crown
for
alarm
is
at
the
first
click
position.
The
crown
at
the
3
o'clock
side
has
nothing
to
do
with
engagement/disengagement
of
the
alarm.
* Checking of the timer function {only for Cal. 7T42B}
1) Pull out the crown for alarm to the first click. The warning beep may sound. In that case, press
button “A”, "B” or ”C” to stop it.
2) Press button “B” twice to set the timer minute hand (stopwatch second hand) for “2 minutes”.
3) Press button “A” to check if the timer starts counting down.
As “A” is pressed, the timer minute hand (stopwatch second hand) moves back one minute and
the timer second hand (stopwatch minute hand) starts moving counterclockwise.
4) Check if, from one minute before the set time is up, the timer second hand stops and the timer minute
hand moves counterclockwise at one-second intervals.
5) Check if the warning beep sounds once every second for 3 seconds before the set time is up.
* After the set time is up, the warning beep sounds for 2 seconds. While it is sounding, the second
hand stops moving. When the beep stops, however, it starts moving again to indicate the current
seconds, automatically making up for the time elapsed while it is stopped.
16
90-9 Printed in Japan