Longines L688 User manual

INSTRUCTION MANUAL

2INTERNATIONAL WARRANTY
LONGINES is delighted you have chosen a time-
piece from its collection, which lives up to the
brand’s long-established know-how, based on re-
search combined with technical excellence and
timeless elegance.
La Compagnie des Montres Longines, Francillon
S.A. grants you, with effect from the purchase date,
a twenty-four (24) month warranty on all LON
GINES® watches models and a five (5) year war-
ranty on the automatic watches purchased from
January 1, 2021, under the terms set out in this
warranty. All watch straps and bracelets are cove-
red by a 24-month international warranty for any
material or manufacturing defects. The LONGINES
international warranty covers defects in materials
and manufacturing that exist at the time of delivery
of the LONGINES watch purchased (“defects”). The
warranty takes effect only if the warranty certificate
has been dated and fully completed by an official
LONGINES dealer (“valid warranty certificate”). Dur-
ing the term of the warranty and on presenting the
valid warranty certificate, you are entitled to have
any defect repaired free of charge. In the event that
repairs cannot restore your LONGINES watch to full
working order, La Compagnie des Montres Longines,
Francillon S.A. undertakes to replace it with an iden-
tical LONGINES watch or another LONGINES watch
with similar characteristics. The warranty for the
replacement watch expires on the same date as the
warranty for the replaced watch.
The warranty does not cover:
• battery life;
• normal wear and tear (such as scratches on the
case and/or glass; alteration of the colour and/
or material of cases, straps, bracelets and chains
made of leather, textile, rubber or any other
non-metallic material; the PVD coating; the colour
of bronze);
• damage to any part of the watch resulting from
unsuitable/improper use, neglect, carelessness,
accidents (knocks, dents, crushing, scratches when
changing the strap/bracelet, etc.), incorrect use of
the watch, orfailure to follow the instruction manual;
• harm of any nature whatsoever resulting directly or
indirectly from using the LONGINES watch or from
any operational failure, defect or lack of precision
in the watch;
•
a LONGINES watch having being handled by a
non-approved person (for example, for the purposes
of replacing the battery or carrying out servicing or
repairs) or having been altered from its original state
other than under the supervision of La Compagnie
des Montres Longines, Francillon S.A.
Any other claims against La Compagnie des Montres
Longines, Francillon S.A., for example for any kinds
of damage or harm other than those set out in this
warranty, are expressly excluded, excepting statuto-
ry rights that the purchaser can assert against the
manufacturer.
This manufacturer’s warranty:
• is independent of any warranty that may be provid-
ed by the vendor and for which the vendor accepts
sole responsibility;
• in no way affects the purchaser’s rights against the
vendor nor any other statutory right the purchaser
may have against the vendor.
The Customer Service department of La Compagnie
des Montres Longines, Francillon S.A. ensures
your LONGINES watch is perfectly maintained.
If your watch needs servicing, entrust it to an offi-
cial LONGINES dealer or an approved LONGINES
Service Centre as listed on our website at
www.longines.com: their servicing is guaranteed to
comply with the standards of La Compagnie des
Montres Longines, Francillon S.A.
*Compagnie des Montres Longines, Francillon S.A.,
CH-2610 Saint-Imier, Switzerland.
LONGINES® is a registered trademark.

3
CONTENTS
We are delighted you have become the owner of
a LONGINES watch. We recommend you read
this instruction manual carefully before using your
LONGINES watch for the first time in order to en-
sure its correct operation and long life. If you would
like more information about your watch or if it is
fitted with a complication, you can find detailed in-
formation and tutorials by going
to our website at www.longines.
com/instruction-manual or by
scanning the QR code.
Precautions concerning water-
resistance
A watch’s water-resistance can be affected by
changes caused by the gaskets drying out, or an ac-
cidental shock to the crown. To help maintain your
watch’s water-resistance, we recommend rinsing it
in soft water after any contact with sea water and
having its water-resistance checked once a year by
an approved LONGINES Service Centre. In no cir-
cumstances should you open your watch yourself.
IMPORTANT! Never activate the time-setting crown
and/or push-pieces when the watch is underwater,
and ensure that the crown and push-pieces are
pushed in or screwed down before any immersion
in water.
*The water-resistance values given in metres are
equivalent to pressure applied in accordance with
standard ISO 22810.
ENGLISH
International warranty 2
Water-resistance 3
Setting the time 4
Longines warranty card 5
1 2 3 4 5
None Not water-resistant No No No
3 bar
Water-resistant to
a pressure of
3 bar (30 m)*
Yes Yes Yes
5 bar
Water-resistant to
a pressure of
5 bar (50 m)*
Yes Yes Yes
10 bar
Water-resistant to
a pressure of
10 bar (100 m)*
Yes Yes Yes
30bar
Water-resistant to
a pressure of
30 bar (300 m)*
Yes Yes Yes
1 indication on the case back
2 meaning*
3 rain, washing your hands
4 showering, taking a bath, washing dishes, doing
housework
5 swimming, snorkelling
3
5
+
*
KEEP THE BATTERY OUT OF REACH OF
CHILDREN
The battery can cause serious injuries if swal-
lowed or placed inside any part of the body.
Seek medical attention immediately.
WARNING

4
1 2
12
6
39
30
20 10
60
30
45 15
23
60
30
55
25
50
20
40
10
35
5
15
45
F
3
4
E
BC
A
H
D
G
2
CHRONOGRAPH  L688
ACrown
BHour hand
CMinute hand
DSmall seconds
EDate window
F30-minute counter
G12-hour counter
HChronograph seconds
hand
2Start/ stop push-piece.
Engage and disengage the
chronograph hand and
counters
3Chronograph hand and
counters reset push-piece
4Date corrector
Hour, minute, seconds and date display. Can be used to time events lasting up to 12 hours, displaying the
results to the nearest 1/5th of a second.
Screw-in crown
Some LONGINES models are equipped with a screw-in crown, which must be unscrewed before setting the
time, correcting the date or winding, by turning it anti-clockwise. After making the settings, return the crown
to position 1, then push it back in and screw it in firmly to ensure the watch's water resistance.

5
CHRONOGRAPH  L688
Rally Add function (partial times)
Used for measuring successive events, but not the
intervals between them. Each result is automatically
added to the preceding one. To time the various
stages of a car rally, for example, follow the
procedure below:
• At the start of the first stage, press push-piece 2:
the chronograph will start.
• At the end of the first stage, press push-piece 2
again: the chronograph will stop.
• Repeat for each stage of the rally.
• At the end of the final stage the chronograph will
show the total time of the rally, in other words, the
accumulated time for all the stages.
• Press push-piece 3 to reset.
Tachymeter scale
Enables the wearer to read the speed in
km/h. Time how long it takes to travel 1
kilometre. The point where the seconds
hand stops indicates the average speed. If it takes
30 seconds to travel 1 km, the scale will indicate an
average speed of 120 km/h.
Pulsometer scale
Enables the wearer to directly read their
heart rate, by starting the chronograph and
counting 30 beats
T
Avoid setting the time while the chronograph
function is in use
Setting the time and stop seconds
Pull the crown out to position 2when the small
seconds hand (situated at 9 o'clock) is at 60. Turn
the crown either way to the desired time display. As
soon as the time is synchronised, push the crown
back into position 1.
If you have not been wearing your mechanical
watch, it needs to be wound manually through thirty
revolutions or so.
Avoid any date correction, or use of the corrector
4, between 20:00 and 03:00; this could damage
the mechanism.
Quick date correction
Press the corrector 4to correct the date using the
corrector tool
The date needs to be corrected after every month
shorter than 31 days. The date will change when the
hour hand passes midnight.
Before each timing operation, the chronograph
hands must be at their start point.
Standard Start – Stop – Reset
function
Timing a single event:
• Press push-piece 2: the chronograph will start.
• Press push-piece 2: the chronograph will stop.
• Press push-piece 3 to reset.

6
20 01 2021
L4.805.4.11.6
49385722
You can also access this information via the QR code to be found in the instruction manual, or by going to:
www.longines.com/instruction-manual
Scanning the QR code on your watch’s warranty
card with your smartphone’s camera gives you ac-
cess to the LONGINES website. There you will find
the specific instruction manual for your watch, avail-
able in 33 languages, together with advice for main-
taining your watch and the warranty terms.
LONGINES WARRANTY CARD

www.longines.com/instruction-manual