Junghans J615.74 User manual

JUNGHANS – DIE D E U T SCHE UHR
Multifrequenz-Funk-Solarwerk
Multi-frequency radio-controlled
solar movement
J615.74

3
DEUTSCH 4
ENGLISH 28
FRANÇAIS 52
ESPAÑOL 76
ITALIANO 100
NEDERLANDS 124
DANSK 148
MAGYAR 172
ČESKY 196
SLOVENSKY 220
POLSKI 244
日本語 268
中文 292
한국의 310

2928
ENG LISH
JUNGH A N S – THE GERMAN 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. That 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

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Contents Page
1. Radio technology 31
2. Environmentally friendly solar technology 34
3. Automatic time synchronisation 34
4. Functions 37
5. Selectable LC displays 38
6. Reception indicator 38
6.1 Manual time synchronisation (transmitter calls) 39
6.2 Setting the time zone 41
6.3 Quartz mode 41
7. Ready for use 43
8. Charge level indicator on watches using solar power 44
8.1 Restarting after a complete discharge of the power store 45
9. Charging times 46
10. General information 48
11. Technical information 49
12.
Impermeability 50
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-
controlled 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
control 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 admini-
stration 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.

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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 south-western Japan) for Japan and
South Korea
– WWVB in Fort Collins, Colorado (USA) for America
As a consequence, the Junghans multi-frequency radio-controlled solar
watch always displays absolutely precise time in these 4 transmission
areas, provided reception is good. The Junghans multi-frequency radio-
controlled solar watch synchronises itself daily automatically with the
DCF77, JJY40, JJY60 and WWVB time signal transmitters. In the event of
reception being disrupted (e.g. due to storms, electrical devices, light
dimmers), the Junghans multi-frequency radio-controlled solar watch
restarts an attempt at reception on the following day at the same time.
A manual time synchronisation can also be performed via a transmit-
ter call, e.g. at a place with better reception conditions. The most
recently received time information is saved in an internal memory. This
continues on a highly-accurate 32 kHz quartz basis until the next time
synchronisation. The radio-controlled time synchronisation of your
Junghans multi-frequency radio-controlled solar watch not only ensu-
res consistently precise time display. The switch from CET to CEST – and
reverse – is also performed automatically for the Junghans multi-
frequency radio-controlled solar watch where undisturbed reception is
available (at night). If you travel to a country with another time zone,
the time zone setting of the Junghans multi-frequency radio-controlled
solar watch enables the time to be set simply to the respective local
time zone.

3534
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
J615.74.
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 beginning of the synchronisation the LC display switches off
automatically and remains off for the entire duration of synchronisa-
tion (maximum 9 minutes), or until manual abort. The hands remain
still and stay in this position during synchronisation (maximum
9 minutes). Following successful time synchronisation the watch
ad usts to the received time.
Automatic time synchronisation can be aborted by pressing any
button. Following an abort, the time ad usts to the internally-saved
time.
For the USA’s WWVB time signal transmitter the following specific
feature applies:
After a successful transmitter call or restart, your Junghans multi-fre-
quency 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 individual US states,
you are given the opportunity to ad ust 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 subsequent transmitter
call or automatic synchronisation.
Pressing T1 displays the transmitter received following successful,
automatic time synchronisation. The time signal always changes the
date automatically. In leap years the 29th of February gets auto -
matically taken into account. If none of the attempts at picking up a
signal lead to clear synchronisation, the reception indicator gets de -
activated (see section 6). Thanks to the internal time-memory, your
watch will continue to run during any days without time synchro -
nisation 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 auto -
matic reception of the time synchronisation signal, the watch should
not be worn and, if possible, not left near to any electrical appliances,
mobile or cordless phones.

3736
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 synchroni-
sing at night and the chances of optimum reception are thus less.
With the time zone set correctly the appropriate transmitter frequency
gets checked as the first priority, thus reducing the length of the trans-
mitter 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
T1
T2
Analogue display: Hours, minutes
LC display: Date, reception indicator, second
Button T1: Press briefly: switch between date,
reception indicator and seconds display
> Press for 3 seconds: transmitter call
Button T2: Time-zone settings

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5. Selectable LC displays
Pressing the T1 buttons enables switching between the displays for
date, reception indicator and seconds. Press once to display the re -
ception indicator. Press again to show the seconds. Please note: the
reception indicator is not displayed continuously and reverts to date
display after 3 seconds.
In the event of low charging level the seconds or date flash in the
LCdisplay (depending on setting) alternately with [Lo].
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.
Please note that no time synchronisation occurs in quartz mode
(see chapter 6.3).
6.1 Manual time synchronisation (transmitter calls)
For manual time synchronisation, so-called transmitter call, press
button T1 for longer than 3 seconds. Both hands begin to move and
travel to the 12:00 position. The reception phase commences as soon as
the display in the LC display goes out. Please keep the watch still or lay
it down during reception.
If no synchronisation is possible with the time signal transmitter, all
further transmitters are checked for possible reception of the time
signal. As soon as a time signal is received set hands ad ust auto -
matically to the local time of the time signal transmitter and the date
is displayed in the LC display. The transmitter received can be displayed
by pressing T1.
Please note: if you are in a reception area that deviates from the time
signal transmitter received, then it is necessary to set the local time for
your area following synchronisation with the aid of the time zone
setting function (see chapter 6.2).

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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
You can abort the manual time synchronisation prematurely as soon as
both hands are in the 12:00 position. To do this, press button T1 or T2
briefly. Minute and second hands revert to the original time.
Please note that manual synchronisation is not possible when the [Lo]
symbol is indicated in the LC display.
6.2 Setting the time zone
The Junghans multi-frequency radio-controlled solar watch receives
the signal of DCF77, JJY40, JJY60 and WWVB. This means that the watch
reliably displays summer and winter time in the transmission areas
(exception WWVB, see chapter 3.).
In other time zones without radio reception the local time can be set
manually by pressing button T2 in hourly steps.
By holding down the T2 button you can fast forward to set the local
time. The hands run parallel to the setting. The date is also ad usted
automatically during the setting process.
If you wish to return the time display to the original time, press button
T2 until the original time is reached again.
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 displayed via the year display
[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 ad usted via the T2 button. Confirm again the
month you have set by briefly pressing button T1.

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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: to achieve a time display accurate to the second in the LC display
set the next full minute and set using button T1 on 60 seconds, using a
reference watch or clock.
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.
Please note: The manual setting procedure must be fully completed
before the watch is ready for further operation.
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 manually
and the watch then performs automatic time synchronisation again.
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
prolonged period by items of clothing as this may impair the watch’s
operational 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 inten-
sity of the light source and the design of the solar watch face. The times
given in the table on page 44 serve as a guide.