Jaeger-leCoultre Calibre 780 User manual

ENGLISH
Contents
Introduction 25
Accuracy and precautions for use 25
Water resistance 26
“1000 Hours Control” test 28
Technical specifications 29
Case 30
Movement 30
Functions and displays 31
Use 33
Interchangeable strap system 37
Interchangeable small buckle system 41
International Guarantee 43
Limited Warranty 47
(United States of America and Canada)
Guarantee for Australia 51

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2
6
13
7
3
8
5
15
1
11
12
10
4
14
9
1Local time hour hand
2Minute hand
3Reference time hour hand
4Seconds indicator
5Crown A 6Push-piece B
7Push-piece C 8Date window
9Chronograph minute counter
10 Chronograph hour counter
11 Chronograph seconds
12 Stop seconds catch
13 24-hour reference time indicator
14 Radial power-reserve indicator
15 Push-piece integrated into the crown

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Introduction
We would like to thank you for the confidence
you have placed in Jaeger-LeCoultre. Our
Maison has applied all its expertise and exacting
standards to the creation of this model.
We invite you to consult the operating
instructions and hope your Jaeger-LeCoultre
timepiece brings you great joy.
Accuracy and precautions for use
MANUALLY WOUND OR AUTOMATIC
MECHANICAL WATCHES
The accuracy of watch models with mechanical
movements is determined by the balance
wheel. This oscillates at a rate of 28,800
vibrations per hour. Despite all the care that the
master watchmakers of the Jaeger-LeCoultre
Manufacture have lavished on building and
assembling your watch, its accuracy is subject
to the influence of gravity, magnetic fields,
accidental impacts, and the ageing of oils.
The accuracy of a watch is measured by its
regularity of rate in various positions.
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Your individual activities could be the cause
of slight irregularities in the working of your
timepiece. If you observe a discrepancy in the
way your watch runs, we advise you to entrust it
to an authorised Jaeger-LeCoultre retailer who
will make the necessary adjustments. Watches
with mechanical movements must not be used
for sports involving significant risk of impact or
abrupt actions, such as golf or tennis.
Water resistance
Your Jaeger-LeCoultre watch is water resistant
up to 10 bar. Its water resistance can be identified
by the symbol engraved on the case-back.
This means that your model has been tested at
an overpressure of 10 bar, corresponding to an
immersion pressure of 100 metres (1 bar = ±10
metres).
In accordance with the ISO 22810/NIHS 92-20
standard, in order to guarantee the durability
of the watch’s characteristics over time, and
as water resistance may be affected by certain
activities, it is recommended that the user:

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- have the watch’s water resistance checked
by an authorised Jaeger-LeCoultre retailer
at least once every two years. It is essential
to have such a check carried out each time
your watch is opened, and before any period
in which it is liable to undergo prolonged and/
or regular immersions.
- check when making the purchase that the
bracelet is suitable for the intended use.
- avoid subjecting the watch to excessively
abrupt temperature changes.
- protect the watch from being dropped or
suffering other accidental impacts, and have
the water resistance checked after any violent
impact.
- avoid the use of the controls, push-piece,
or time-setting crown while under water, or
outside the water, if the watch is not yet dry
after immersion.
- restore the time-setting crown and the push-
pieces to their normal positions, or where
applicable, close the compression keys, after
every manipulation.
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- rinse the watch with fresh water after use in
sea water.
You may use your watch during short swims and
when jumping in from the edge of a swimming
pool, but not from a diving board. It must not
be used for scuba diving or for sports involving
significant risk of impact, such as windsurfing
or waterskiing. Also, note that leather straps are
not suited for aquatic activities.
“1000 Hours Control” test
Jaeger-LeCoultre submits all its watches to
its stringent “1000 Hours Control”, a battery
of comprehensive and rigorous internal tests
lasting a full 1000 hours.
The “1000 Hours Control” seal or legend
placed or engraved on the back of your watch
certifies that the timepiece has successfully
passed all the tests relating to regularity of
rate, temperature, atmospheric pressure, and
resistance to shocks and magnetic fields, as
well as water-resistance trials. Thus, your watch
is capable of withstanding the daily stresses
and strains that await it. The criteria of the

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“1000 Hours Control” programme considerably
exceed the standards of official timing tests,
which deal only with part of the movement.
Jaeger-LeCoultre tests not only the movement
prior to being cased up in the watch, but also
the watch once it has been assembled.
Technical specications
- Automatic movement, Jaeger-LeCoultre
Calibre 780.
- 28,800 vibrations/hour.
- Power reserve: approximately 60 hours.
- Water-resistant to 10 bar.
- Crown function selector and indicator.
- Main time zone adjustable in one-hour jumps.
- Second time zone (hour and 24-hour
indication).
- Circular indication of the 60-hour power
reserve.
- Date.
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- Small seconds (indication that the movement
is operating).
- Independent stop seconds.
- 569 parts.
Case
- Case shock-absorbing system.
- Interchangeable strap system integrated into
the case.
- Chronograph with large minute counter.
Movement
Jaeger-LeCoultre Calibre 780.

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Functions and displays
FUNCTION SELECTOR
Activated by a push-piece that is integrated into
the crown, the function selector enables several
functions to be adjusted without having to
delicately pull out the crown. Once the function
has been selected, adjustments can be made
simply by rotating the crown. In its “neutral”
position, the crown serves to wind the barrel.
One press shifts the crown to the position for
adjusting the time in the second time zone as
well as the date. Another press shifts the crown
to the position for adjusting the time in the main
time zone. Another successive press brings the
system back to its initial (neutral) position.
This system, which eliminates the need to pull
out the crown, ensures optimal water resistance
without resorting to the traditional compression
key.
Note: It is essential to return to the neutral
position after making an adjustment, as the
watch may otherwise stop.
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THE POWER RESERVE
The functions of a wristwatch clearly depend on
the energy transmitted to the movement. The
barrel of the Master Compressor Extreme LAB 2
guarantees a 60-hour power supply. To consult
the remaining power reserve at any time, a
new radial display (patent pending) featuring
a simple and intuitive read-off appears on the
circumference of the upper part of the dial.
As the power reserve gradually dwindles, the
various segments of the semi-circular indicator
move from white to red (or gold, depending on
the model). This large display mode enables
the barrel’s state of winding to be read off at a
glance, even in poor weather conditions or dim
lighting.
CHRONOGRAPH DIGITAL MINUTE
COUNTER
During endurance activities, the chronograph
minute counter is just as crucial as the seconds
hand. In order to ensure at-a-glance readability,
the watchmakers of the Manufacture have de-
veloped an instant read-off display: positioned

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at 12 o’clock, a large double-digit counter dis-
plays the chronograph minutes. Its operation is
based on an instant-jump mechanism, which is
activated at the exact moment that the seconds
hand completes a full turn. The chronograph’s
total hours indicator is positioned at 9 o’clock.
THE SECOND TIME ZONE
The presence of a GMT function is a fundamental
attribute of an explorer’s watch. In keeping
with a well-established tradition on Jaeger-
LeCoultre calibres, the second time zone,
which indicates the user’s customary place of
residence, is indicated by an additional central
hour hand, which is complemented by a 24-hour
display at 6 o’clock.
Use
STARTING THE WATCH
Position the crown in its neutral “N” position
on the dial. A few clockwise turns of the
crown will suffice to start the watch. It will
then automatically wind up when you wear it.
Please note that the crown does not lock when
winding, even when the watch is fully wound.
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SETTING THE TIME
Position the crown in its time-setting or “SET”
position on the dial.
Turn the hands until they display the desired
time. Once the time has been set, position the
crown in its neutral “N” position.
THE STOP-SECONDS DEVICE
In the time-setting position, the seconds hand
pursues its progress and the watch’s running
precision is not affected.
Activating the catch on the left-hand side of
the case ensures accurate adjustment of the
seconds hand. The twin actions of pressing and
sliding the catch stop the seconds hand and
the movement, which will begin running again
once the catch is returned to its initial position.
This mode of operation in two phases – sliding
and pressing – serves to avoid any accidental
activation.
SETTING THE DATE AND SECOND
TIME ZONE
The time zone is set using the function selector
integrated into the crown. This, in turn, drives

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the date either forwards or backwards.
Position the crown in its “GMT” position on the
dial to set the date and second time zone.
Perform the required number of turns until the
desired date is displayed. Make one extra turn if
the time is past noon.
Once the operation is complete, return the
crown to its neutral “N” position on the dial.
The Master Compressor Extreme LAB 2 model
features a double hand-fitting that enables the
user to adjust the local time on the main display
quickly by turning the corresponding hand
forwards or backwards in one-hour jumps,
while maintaining a reference time thanks to
an additional hour hand featuring a 24-hour
indicator at 6 o’clock. The watch offers the
following functions:
- The time in a second time zone, which can be
adjusted when the function selector is in the
“GMT” position.
- The date synchronised with the time of the
second adjustable time zone, which can be
moved in both directions when the function
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selector is in the “GMT” position.
- The reference time, when the function selector
is in the “SET” position.
- A 24-hour indication linked to the time in the
second time zone.
- Minutes and small seconds.
Considering these functions, if you happen to
display a time in the second time zone that is
identical to the reference time, the hour hands
will be superimposed.
OPERATING THE CHRONOGRAPH
The central direct-drive seconds hand of your
watch displays the chronograph seconds to
within one-eighth of a second.
An instantaneous digital counter at 12 o’clock
counts up the minutes up to 60 minutes (after
one rotation, it keeps turning and recounts
another 60 minutes).
A second counter at 9 o’clock counts the hours
up to 24 hours.
- Push-piece at 2 o’clock: this push-piece starts
and stops the chronograph function.

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- Push-piece at 4 o’clock: this push-piece resets
the counters and the central seconds hand.
When timing is in progress, pressing this push-
piece has no effect.
This push-piece construction ensures easy
handling of the watch. The two traditional
push-pieces are covered and protected by
two metallic L-shaped levers pivoting around
the crown. They thus provide a broad surface
area guaranteeing an improved grip, while also
protecting the crown and its integrated function
selector. The upper surface of the push-pieces
is coated with rubber grooves to avoid fingers
accidentally slipping when handling the watch
in extreme weather conditions.
Interchangeable strap system
The innovative design of the new integrated
interchangeable strap system is controlled by
a lever located on the case-back. Rotating it
releases the strap fastening and thus enables
quick and easy strap changes. The double
alligator-skin strap guarantees its reliability
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and its comfortable fit, while its double safety
pin buckle guarantees accurate two-position
adjustment between each notch.
The case-back of your watch is fitted with an
integrated interchangeability system, which
enables the strap to be changed easily. It
consists of 2 flap covers that can be raised,
each of them thus moving part of the inter-lug
section in order to release the strap’s spring bar
from its housing.
REMOVING THE STRAP SECTIONS FROM
THE CASE
- Hold the back of the watch case between the
thumb and forefinger of one hand.
- Raise the flap cover upwards with the thumb
of the same hand and keep it raised.

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- Pull the strap section towards you in order to
dislodge it using your other hand.
- Once the strap section has been dislodged, let
the flap cover drop down again.
- Proceed in the same way for the other section.
FITTING THE STRAP SECTIONS ONTO
THE CASE
- Hold the back of the watch case between the
thumb and forefinger of one hand.
- Raise the flap cover upwards with the thumb
of the same hand and keep it raised.
- Hold the strap section between the thumb and
forefinger of your other hand, and position its
spring bar in the lug housings.
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- Keeping the strap parallel to the case, insert
the spring bar firmly into the housings.
- Once the strap section is in place, let the flap
cover drop down again.
- Proceed in the same way for the other section.
ADJUSTING YOUR FOLDING CLASP
Your folding clasp can be adjusted to 2 positions.
The two positions appear on the buckle: “short”
or “long”.
The central pin is
pushed towards the
Jaeger-LeCoultre logo.
The strap is pivoted
180° towards the upper
part of the small buckle.
The central pin is
pushed back into its
initial position.

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Check that the central pin and spring bar are
symmetrical during each operation.
ADJUSTING THE LOOP ON YOUR STRAP
The mobile loop of your watch can be adjusted
to 3 positions.
- Simply dislodge the stud attached to the
mobile loop.
- Select one of the three holes on your strap.
- Push the stud into the chosen hole.
Interchangeable small buckle system
Unlocking the pin.
Locked buckle
position – strap in
extended position.
Unlocked buckle
position – strap in
extended position.
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Unlocked buckle
position – the buckle
is removed.
The strap is rotated 120°
towards the lower part
of the small buckle.
The strap is positioned
facing the notches, thus
releasing it from the
small buckle.