Junghans J615.84 User manual

Multifrequenz-Funk-
Solarwerk
J615.84
JUNGHANS – DIE D E U T SCHE UHR

2524
ENG LISH
JUNGHAN S – TH E G E R M AN WATCH
Many congratulations on your purchase of a timepiece from
Junghans.
What began in 1861 with the founding of the firm in Schramberg
quickly developed into one of the most fascinating success stories
of the German watchmaking industry. While since that time the
demands made of watches may have changed, the Junghans
philosophy has always remained the same. Innovative flair and the
constant pursuit of precision right down to the smallest detail
define how the company works and thinks. You can see and sense
this in every watch that carries the Junghans name. For as diverse
as the Junghans range may be, it pursues one single goal: to
combine traditional craftsmanship with cutting-edge watch
technology and exciting design. hat makes every watch with the
Junghans star unique.
We hope you will enjoy this very special time-keeping instrument.
Yours,
Uhrenfabrik Junghans GmbH & Co. KG

2726
Contents Page
1. Radio technology 27
2. Environmentally friendly solar technology 30
3. Automatic time synchronisation 30
4. Functions 33
5. Selectable LC displays 35
6. Reception indicator 35
6.1 Manual time synchronisation (transmitter calls) 36
6.2 Setting the time zone 38
6.3 Quartz mode 38
7. Ready for use 40
8. Charge level indicator on watches using solar power 41
8.1 Restarting after a complete discharge of the power store 42
9. Charging times 43
10. General advice 44
11. Technical information 44
12. Water resistance 45
1. Radio technology
The most up-to-date way to keep time.
5,000 years have passed since timekeeping began with sundials. In the
interim there have been water clocks, the mechanical clocks of the 13th
century and quartz watches. Now we have the Junghans radio-control-
led watch. This is a watch that, with good reception, will never go
wrong and never need setting. The Junghans radio-controlled watch is
absolutely precise, as it is linked via radio technology to the timing con-
trol of the most accurate clock in the world, For Europe this is the
Caesium Time Base at the Physikalisch-Technischen Bundesanstalt in
Braunschweig (Germany’s Institute of Natural and Engineering
Sciences). For Japan the Caesium Time Base of the National Institute
for Information and Communications Technology (NICT), a public
administration authority organisation. For North America it is the U.S.
Commerce Department’s Caesium Time Base at the National Institute
of Standards and Technology (NIST) in Boulder, Colorado. These clocks
are so accurate that they are expected to deviate by no more than 1
second in a million years.

2928
Your Junghans multi-frequency radio-controlled solar-powered watch
is able to automatically pick up time signals from the following trans-
mitters:
– DCF77 in Mainflingen (24km south of Frankfurt am Main) for
Europe,
– JJY40 on Mount Ohtakadoya (near Tokyo in the North East of the
country) for Japan
– JJY60 on Mount Hagane (in the South West of Japan) for Japan,
the East Coast of China (Shanghai), South Korea and parts of
Taiwan
– WWVB in Fort Collins, Colorado (USA) for America
This means that within range of one of these 4 transmitter stations
your Junghans multi-frequency radio-controlled solar-powered watch
will display the exact time when reception conditions are adequate.
Junghans radio-controlled wristwatches automatically synchronise
themselves every day with the DCF77, JJY40, JJY60 and WWVB time
signal transmitters. If your Junghans multi-frequency radio-controlled
solar-powered watch is unable to receive a signal due to interference
(e.g. thunder storms, electronic devices, lighting dimmer switches) it
will automatically attempt to receive a signal the following day at the
same time. The time can also be synchronised manually by calling a
transmitter e. g. from a place with better reception. The most recent
time information received is stored in an internal time memory. This
time is then kept by a high-precision 32 kHz quartz oscillator until the
next time your watch is synchronised. The radio-controlled time syn-
chronisation function of your Junghans multi-frequency radio-control-
led solar-powered watch not only ensures total time accuracy, but also
automatically switches (at night) from winter time to daylight saving
time (Europe and North America) and vice-versa when reception is
available. The Junghans multi-frequency radio-controlled solar-powe-
red watch time zone adjustment function enables you to set your
watch to the relevant local time when travelling in countries in other
time zones.

3130
2. Environmentally friendly solar technology
Technology that needs no batteries! Light – no matter whether sun-
light or artificial – penetrates the solar or light-transparent watch face.
This transforms the light into electrical energy, which gets saved in a
long-life power store. The power store serves as the source of electrici-
ty for your multi-frequency radio-controlled solar-powered movement
J615.84.
3. Automatic time synchronisation
The automatic time synchronisation process always takes place at
night based on the local time set on your watch:
EU – DCF 77: at c. 2 a.m. and 3 a.m.
JP – JJY40 and JJY60: c. 2 a.m.
US – WWVB: c. 2 a.m.
At the start of the synchronisation process the LC display automatical-
ly switches off. The display remains switched off for the full duration of
the synchronisation process (max. 9 minutes) or until this is manually
aborted. Automatic time synchronisation can be aborted by pressing
any button.
For the USA’s WWVB time signal transmitter the following specific
feature applies:
After a successful transmitter call or restart, your Junghans multi-
frequency radio-controlled solar-powered watch always reads in
Pacific Standard Time. Due to the non-uniform changeover from
summer to winter time and the differing time zones in the individu-
al US states, you are given the opportunity to adjust winter time,
summer time and time zone settings (see 6.2) manually. If, due to
where you are, the time zone or summer / winter time that you have
set differs from PST, it is nevertheless retained during any subse-
quent transmitter call or automatic synchronisation.
After automatic time synchronisation has been successfully perfor-
med, you can see which transmitter the signal was picked up from by
pressing button T1. The time signal always changes the date automati-
cally. In leap years the 29th of February gets automatically taken into
account. If none of the attempts at picking up a signal lead to clear syn-
chronisation, the reception indicator gets deactivated (see section 6).
Thanks to the internal time-memory, your watch will continue to run
during any days without time synchronisation with the precision of a
quartz watch. The next successful reception of the time signal leads to
synchronisation and the reception indicator on the LC display becomes
activated.
Recommendation: To ensure the best possible conditions for automa-
tic reception of the time synchronisation signal, the watch should not
be worn and, if possible, not left near to any electrical appliances, mobi-
le or cordless phones.

3332
It is also helpful for picking up the signal to set the appropriate time
zone for your location, as an attempt at synchronisation always begins
at c. 2 a.m. based on the local time set on the watch. If the time zone is
wrong, the watch will try to synchronise with the time signal transmit-
ter that was previously set.
For example: You travel from Europe to Japan. Your watch has CET
saved and tries to synchronise in line with CET at 10 a.m. in Japan. At
that time of day interference is disproportionately greater than when
synchronising at night and the chances of optimum reception are thus
less.
With the time zone set correctly the appropriate transmitter frequen-
cy gets checked as the first priority, thus reducing the length of the
transmitter check and power consumption.
Important note:
When you travel into a different reception area (e.g. travelling from
Germany to Japan), automatic time and transmitter synchronisation
does not take place until the watch next picks up a time signal. If the
watch fails to pick up a time signal, perform a manual transmitter call
(see section 6.1).
4. Functions
Please note: depending on the model you have, your Junghans multi-
frequency radio-controlled solar-powered watch is fitted either with
buttons or with correctors recessed within the case. To operate the cor-
rectors please use a suitable pointed implement.
Button lock (not all models)
On certain models of t e Jung ans multi-
frequency radio-controlled solar-powered
watc you are able to lock t e T2 button. To
do so, locate t e safety slider between T1
and T2 and pus it down (i.e. towards T2)
until it snaps into place and t e red mark is
visible.
If you pus t e safety slider back up (i.e.
towards T1), all T2 functions are again avai-
lable.
T2
T1

3534
5. Selectable LC displays
The LC display is showing the date. By briefly pressing button T1, you
can activate the reception indicator. After 3 seconds, the display swit-
ches back to the date.
If the charge level is low, the LC display shows the seconds (flashing
alternately with [LO]). The second hand stops at the 12 o’clock position.
6. Reception indicator
The reception indicator shows you whether synchronisation has taken
place with one of the time signal transmitters. It can display the four
following codes:
EU = DCF 77 (Europe)
JP = JJY 40 (Japan)
JP. = JJY 60 (Japan)
US = WWVB (USA)
If a time signal transmitter is shown on the LC display, the watch has
picked up the signal during the overnight automatic time synchronisa-
tion. If all that is shown on the LC display is two bars, poor reception
conditions have resulted in no automatic synchronisation taking place.
After the next successful synchronisation, the relevant time signal
transmitter will once again be indicated.
T1
T2
Analogue display: Hours, minutes, seconds
LC display: Date, reception indicator, charge level indicator
Button T1: Date, reception indicator, transmitter call
Button T2: Time-zone settings

3736
6.1 Manual time synchronisation (transmitter calls)
To perform manual time synchronisation, called making a ‘transmitter
call’, press button T1 for longer than 3 seconds. The second hand begins
to move and positions itself at 12 o’clock. The minute and hour hands
continue to show the current time. The signal reception phase starts as
soon as the indicator on the LC display goes out. While the signal is
being received, please keep your watch still or put it down.
If synchronisation is not possible with the time signal transmitter
shown, all other transmitters get checked for possible reception of the
time signal. As soon as the time signal has been picked up, the hands
automatically move to the time signal transmitter’s local time and the
date gets shown on the LC display. By pressing button T1 you can see
which transmitter has been picked up. Should you be in a time zone
different to that of the time signal transmitter that the watch picked
up, you will need to set the applicable local time for that location (see
section 6.2) once synchronisation has been successfully completed.
The time zones displayed when picking up the signal from the respec-
tive transmitters are as follows:
Transmitter Time transmitted
EU DCF77 (Europe) CET or CEST
JP JJY40 (Japan) Japanese local time
JP. JJY60 (Japan) Japanese local time
US WWVB (North America) Pacific Standard Time
If you wish, you can interrupt the manual time synchronisation pro-
cess, as soon as the second hand has moved to the 12 o’clock position.
To do so, briefly press button T1 or T2. The second hand resets itself to
the original time. Please note that manual time synchronisation is not
possible if the [LO] symbol is being shown on the LC display.

3938
6.2 Setting the time zone
Your Junghans multi-frequency radio-controlled solar-powered watch
is able to pick up the DCF77, JJY40, JJY60 and WWVB signals. Within the
transmitter coverage areas your watch will thus reliably display sum-
mer or winter time respectively (WWVB is an exception – see section
13).
If you travel to a country with a different time zone, you can adjust the
time then being displayed to the local time. You set the time zone by
pressing button T2. By holding down button T2, you can quickly scroll
through all known time zones. The hands run in parallel to your setting.
The date also gets automatically adjusted when you set the zone.
If you want to reset the time display to the original time, trigger a
transmitter call when within the time signal transmitter’s reception
range or press button T2 repeatedly until you have got back to the ori-
ginal time.
6.3 Quartz mode
In order to set the time manually, press both buttons for longer than 3
seconds (or until the indicator on the LC display goes out). After the
hands have reached the 12 o’clock position, press button T1. The watch
is now in quartz mode. Quartz mode is indicated by the display sho-
wing the year, e.g. [99]. Every time you press the T2 button the display
advances by one year. Holding down button T2 scrolls through the
years quickly.
Once you have entered the current year, confirm this with a brief press
of button T1. The LC display now switches to showing the month set-
ting [¡™]. This is again adjusted via the T2 button. Confirm again the
month you have set by briefly pressing button T1.
Perform the following settings using the procedure described above:
– Set the date – the LC display switches to [£¡] (or the final day in the
month)
– Set the hour – the LC display switches to [™£]
– Set the minutes – the LC display switches to [∞ª]
Note: So that the seconds are shown correctly, set the next full minute
and then confirm your entry when the seconds reach the 60th second.
After the minutes have been set and subsequently confirmed by pres-
sing button T1, the hands of the multi-frequency radio-controlled solar-
powered watch move to the programmed time. The LC display shows
the date. The programmed time can be corrected by holding down but-
ton T2 for longer than 3 seconds.
In quartz mode the watch does not perform any automatic attempt to
pick up a time signal. A manual transmitter call can be made at any
time. A successful transmitter call will overwrite the time set manual-
ly and the watch then performs automatic time synchronisation again.

4140
7. Ready for use
In order to keep your Junghans multi-frequency radio-controlled solar-
powered watch ready for use, it should be kept in a very well lit place.
Please ensure that the solar watch face does not get covered for any pro-
longed period by items of clothing as this may impair the watch’s opera-
tional functionality.
If the power reserves have run out, hold your watch in bright light to
recharge it. How long it takes to charge up is dependent on the intensity
of the light source and the design of the solar watch face. The times
given in the table on page 43 serve as a guide.
Important note:
Do not keep your Junghans multi-frequency radio-controlled solar-
powered watch too close to any light sources that generate heat! Do not
leave your watch in direct sunlight for any prolonged period!
Temperatures of over 50°C may cause damage to your watch!
8. Charge level indicator on watches using solar power
With the power store fully charged, the Junghans J615.84 multi-fre-
quency radio-controlled solar-powered movement has power reserves
to last up to 21 months. The LC display provides information on the
power status:
[º¡] The date or the reception indicator is being shown. The watch is
fully operational.
[º ¡ ] The date is shown, flashing alternately with [LO]. The watch needs
light / energy. Please charge up the power store until the display
stops flashing.
[--] The watch is being charged, but is not yet ready for use again.
Continue to expose the watch to a source of light.
[ ] No indicator: after 72 hours without exposure to light, the multi-
frequency radio-controlled solar-powered watch has activated
sleep mode. Briefly expose the solar watch face to a source of light
or briefly press one of the buttons. The hands then move quickly
to the saved time. In order to obtain the current radio time, the
multi-frequency radio-controlled solar-powered watch begins an
automatic transmitter search at the end of the next full minute.
[ ] No indicator; hands are in the 12 o’clock position: The multi-fre-
quency radio-controlled solar-powered watch’s power store is
completely discharged. Please expose the watch to a source of
light (see section 8.1).