Seiko 6138A User Manual

6138AAubm
cChronograPh
Casing diameter
Height
Vibrations
per
hour
Automatic winding
(with
winding)
Calendar
(Day
& date,
Bilingual change-
over mechanism
for
day
indication,Rotary
type
instant
day
& date
setting device)
Chronograph
(Second,
hour hand
12
hour totalizer, minute
hand
-
30 minute
tot
alizer, a
ccumulated)
2) Features
o
An-advanced automatic winding
chron-
ograph
o
Easy-to-use,
regular
chronograph
mech-
anlsm
o
SEIKO's special
clutch mechanism
without
starting/stopping
errors
o
Simplified structure
and automatic
winding
by the stabilized
pawl
lever
system
.
Day
and date
instant
setting device
operated simply by revolving
the
crown
.
Bilingual change-over
mechanism for
day
indication
selectable by
preference
o
Auxiliary hand winding
device instant-
ly usable for measuring
time
o
External
devices
with
manv functions
3) Disassembly and
assembly
4)
Lubrication
Colored symbols
in
the
illustrated
figures indicate the types of
oil, its
quan-
tities to be applied,
and
lubricating
points.
Types of oil:
>Moebius
Synt-A-Lube
>Seiko
watch
oil S-4
Oil
quantity
? Extremely small
quantity
aD
Normal
quantity
a.-
Sufficient
quantity
t
Oil must
not
be applied.
Note: Unindicated
portions
do not
re-
quire
lubrication.
5)
Checking and adjusting
Refer to
6139A
Technical Guide
for
checking and adjusting
items
of
second
and
minute chronograph mechanism.
27.00rnIIl
7.90nlln
21,600
auxiliaryhand
Disassemble
①
卜
→
⑪
Assembleby
①
→
①
Installation of the
automatic winding
nrechanism varies
as
comDared
with
con-
ventional watches.
The automatic
winding mechanism
should be installed
after setting the move-
ment with hands in the
case
for
adjusting
chronograph mechanism
and setting hands
works.
the watch
according to Figs.
reversing
the above:
Figs.
‑6138A‑1‑
Movement

Seiko 6138A Specifications

General

Movement	Automatic
Caliber	6138A
Case Material	Stainless Steel
Dial Color	Black
Bracelet Material	Stainless Steel
Jewels	21
Crystal	Hardlex
Functions	Chronograph, Date
Beat Rate	21600 bph

Summary

Automatic Winding Mechanism

Calendar Mechanism

Hand Setting Procedure

Procedure for setting the second, minute, and hour hands for chronograph operation.

Chronograph Mechanism

Pre-Assembly Checks

Checks before assembling pallet fork and staff after setting chronograph bridge.

Post-Assembly Checks

Checks for strength, height, and meshing after balance assembly.

Train Wheel System

Hour Chronograph Mechanism

Chronograph Operation

Stopping Minute and Second Hands

Explanation of how minute and second recording wheels are stopped.

Starting Minute and Second Hands

Procedure for starting minute and second recording wheels using coupling levers.

Hour Hand Operation

Details on stopping and starting the chronograph hour hand.

Chronograph Resetting and Safety

Minute and Second Hand Resetting

Hour Hand Resetting

Fly-back Safety Mechanism

Setting Mechanism

Crown Setting Operations

Day and Date Correction

Time Setting