Multifrequenz-Funk- Solarwerk

Multi-frequency radio-controlled
solar movement
Many congratulations on your purchase of a timepiece from
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.
Uhrenfabrik Junghans GmbH & Co. KG
1. Radio technology
2. Environmentally friendly solar technology
3. Automatic time synchronisation
5. Selectable LC displays
6. Reception indicator
6.1 Manual time synchronisation (transmitter calls)
6.2 Setting the time zone
6.3 Quartz mode
7. Ready for use 44
8. Charge level indicator on watches using solar power
8.1 Restarting after a complete discharge of the power store
9. Charging times
10. General information 49
11. Technical information
12. Impermeability
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-cont­
rolled 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
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.
Your Junghans multi-frequency radio-controlled solar-powered watch
is able to automatically pick up time signals from the following trans­
– DCF77 in Mainflingen (24km south of Frankfurt am Main) for
– 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 transmitter 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 synchroni­
sation of your Junghans multi-frequency radio-controlled solar watch
not only ensures 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 undis­
turbed reception is available (at night). If you travel to a country with
another time zone, the time zone setting of the Junghans multi-fre­
quency radio-controlled solar watch enables the time to be set simply
to the respective local time zone.
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 electricity
for your multi-frequency radio-controlled solar-powered movement
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
adjusts to the received time.
Automatic time synchronisation can be aborted by pressing any
­button. Following an abort, the time adjusts to the internally-saved
For the USA’s WWVB time signal transmitter the following specific
feature applies:
After a successful transmitter call or restart, your Junghans mul­
ti-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 individual
US states, you are given the opportunity to adjust winter time, sum­
mer 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
de­activated (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.
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 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
Please note: depending on model, your Junghans multi-frequency
radio-solar watch is equipped with pushers or correctors embedded
into the case. Please use the corrector pin enclosed to operate the
embedded correctors.
Key lock (depending on model)
Depending on the model of your Junghans multi-frequency radio solar watch you have the option of locking the T2 key.
Key lock via crown:
Rotate the crown until it clicks into place and
the red marking is visible, as in the illustration
on the left.
Rotate the crown halfway and all functions of
T2 are available again.
Key lock via security cover:
Slide the security cover between T1 and T2
down­wards (in the direction of T2) until it clicks
into place and the red marking is visible.
Sliding the security cover back up (in the direction of T1) means that all functions of T2 are
available again.
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.
Analogue display:
hours, minutes, seconds
LC display:
date, reception indicator, charge level indicator
Button T1:
press briefly: reception indicator
press for > 3 seconds: transmitter call
Button T2:
time-zone settings
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)
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)
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. Minute and hour hands
remain at the time last displayed. 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:
[EU] DCF77 (Europe)
[JP] JJY40 (Japan)
[JP.] JJY60 (Japan)
[US] WWVB (North America)
Time transmitted
Japanese local time
Japanese local time
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.
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 adjusted
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 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
setting [¡ ™]. 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
–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
pressing 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 button 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 intensi­
ty 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.
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.
[ ]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 two bars flash at 10-second intervals. The watch is already
charging, but not yet operational. Continue to expose the watch
to a light source (see 8.1 and 9.2).
[ ] No display: after 72 hours without light intake the multi-fre­
quency radio-controlled solar watch has activated sleep mode. To
start up the watch expose the solar dial briefly to a light source
or press one of the buttons. As the watch will not attempt recep­
tion during sleep mode, the time will be set back to the quartz
movement basis – the hands revert to this time. To receive the
current radio time again the multi-frequency radio-controlled
solar watch will commence automatic reception with the next
full minute.
[ ] No display, hands are stopped: the energy store of the multi-fre­
quency radio-controlled solar watch is completely discharged,
please place the watch in a light source (see chapter 8.1).
8.1 Restarting after a complete discharge of the power store
Following a complete discharge of the energy store the Junghans mul­
ti-frequency radio-controlled solar watch must be placed in a source of
light in order to recharge the energy store. During the charging process
two bars flash in the LC display [--]. A restart is carried out automati­
cally as soon as the charging process is completed. The hands move to
the 12:00 position and the watch begins to receive the time signal. The
display goes off in the LC display. In the case of successful reception the
watch automatically adjusts to the correct time after a few minutes.
If the watch has still not received a time signal after 50 minutes, the
reception procedure will be discontinued to save energy and repeated
every 6 hours. The hands remain in the 12:00 position and two flashing
bars are displayed in the LC display [--] every two seconds. To receive
a time display in spite of this the watch can be set to the current time
manually using the quartz mode. The watch then continues to run
with the accuracy of a quartz watch.
To enter the quartz mode press button T1. The watch is now in quartz
mode (see chapter 6 .3).
9. Charging times
9.1 Daily operation
The following table shows how long the watch needs to be exposed to
the light each day in order to generate sufficient electricity for normal,
daily operation, without discharging the battery.
Light source
Daily operation
Sunlight outdoors
approx. 50.000
7 mins.
Sunlight through a window
approx. 10.000
25 mins.
Daylight though a window on a cloudy day
approx. 5.000
40 mins.
approx. 500
7 hours
Fluorescent lighting
Please ensure that the watch is not exposed to temperatures over
50 degrees Celsius during the charging process.
9.2 Following complete discharge
The following table shows you the charging times following complete
discharge of the energy store. These charging times are dependent
on the intensity of the light source. The guideline values stated in the
table are for orientational use only. Please note that the design of the
solar dial affects the charging time.
Light source
Charging time
until reception is
Charging time until
complete charging
of energy store
Sunlight outdoors
approx. 50.000
approx. 1 day
approx. 1 day
Sunlight through a
approx. 10.000
approx. 4 days
approx. 6 days
Daylight though a
window on a
cloudy day
approx. 5.000
approx. 8 days
approx. 500
Fluorescent lighting
Please ensure that the watch is not exposed to temperatures over
50 degrees Celsius during the charging process.
During the charging process two bars are displayed [ ]­­­ in the LC dis­
play after approximately 1 minute, blinking at 10-second intervals.
10. General information
External influences can affect the watch’s waterproof qualities, which
may let in moisture. We therefore recommend that you have your
watch regularly inspected by your Junghans specialist. Other servicing
tasks or wrist strap repairs should also be done by your Junghans
­specialist. Your watch is fitted with a quality wrist strap that has
undergone multiple inspections in our factory. If, however, you decide
to change the strap, please fit a new one of the same quality, preferably
an ­original Junghans wrist strap. Watch and wrist strap can be cleaned
with a dry or slightly moistened cloth.
NB: Do not use che­mical cleaners (e.g. benzine or paint thinners). These
may harm the surface.
11. Technical information
Time taken to self-set with good reception
c. 3 -10 minutes
Time zone adjustment range (UTC)
+ /–12 hours
Switching from CET to CEST and vice versa
Time comparison with the DCf77 time signal
2 a.m. and 3 a.m.
Synchronisation with the time signal transmitters
c. 2 a.m.
Operating temperature
0° to + 50° C
No licence fee. Approved by the German Post Office. Subject to technical
Declaration of conformity
Uhrenfabrik Junghans GmbH & Co. KG herewith declares that this
wristwatch conforms to the principle requirements and other relevant
stipulations of Directive 1999/5/EC.
A corresponding declaration of conformity can be requested from
12. Impermeability
Instructions for use
No mark
Swimming equipment
10 BAR
The designation ”3 – 10 BAR” only applies to brand new w
­ atches.
External influences can affect water resistance. Please have your watch
checked regularly.
42.712-0515 / 0917
Uhrenfabrik Junghans GmbH & Co. KG
Postfach 100 · D-78701 Schramberg ·
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