Junghans Mega MF Multi-Frequenz W 615.94 User manual

JUNGHANS UHREN GmbH · Postfach 100 · D-78701 Schramberg
www.junghans.de
42.712-0416 / 4130766 / 0607
Junghans Mega MF
Multi-Frequenz
W 615.94

2524
ENGLISH
Contents Page
1. Radio technology –
The most up-to-date way to keep time 26
1.1 Usable time signal transmitters 27
2. Readiness for use 29
3. Automatic time synchronisation 30
4. Functions 32
5. Selectable LCD displays 33
6. Description of watch functions and how to use them 34
6.1 Second time 34
6.2 Reception display 35
6.3 Manual time synchronisation (transmitter calls) 36
6.4 Time zone adjustment 38
6.5 Set language (day of the week display) 39
7. Restart / getting started 39
7.1 Manual start 40
8. General information 42
9. Technical information 44

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1.1 Usable time signal transmitters
Your Junghans Mega MF radio-controlled watch is capable of
fully automatic reception of time signals from the following
transmitters:
– DCF77 in Mainflingen (24km Southeast of Frankfurt am Main)
for Europe
– WWVB in Fort Collins, Colorado (USA) for North America
– JJY40 on Mount Otakadoya (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 (Peking, Shanghai), South
Korea and parts of Taiwan
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 radio-
controlled watch.
A watch that in good reception conditions never goes wrong and
never has to be set. The Junghans radio-controlled watch is
absolutely precise, as it is linked by radio frequency to the time
control systems of the most accurate clocks 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 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.
For Japan the Ministry of Post and Telecommunication’s Caesium
Time Base at the Commercial Research Laboratory (CRL).
All of 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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2. Readiness for use
So that your watch is always ready for use, you should make sure
that does not run low on power. The watch regularly checks to see
if it has sufficient battery power. If it no longer has enough (e.g.
the battery has run out or ambient temperature is too low, impair-
ing battery performance), the second hand stops at the 12 o’clock
position. Whatever display is set at that time on the LCD also then
flashes, alternating with the letters ’Lo’. If the battery does not
recover (e.g. through an increase in the ambient temperature), you
should take the watch as soon as possible to your specialist retailer
to have the battery changed, or send it to have this done to the
Junghans Service Centre.
Battery type: CR 1620
Please note that manual time synchronisation is not possible
when battery power is low. Too much power would be needed.
With good reception, the Junghans Mega MF thus always shows
the perfectly correct time within any of these four transmission
areas. Every day at 2am and 3am by the analogue display, the
Junghans radio-controlled watch automatically synchronises itself
with the DCF77,WWVB, JJY40 and JJY60 time signal transmitters.
If reception fails due to interference (e.g. stormy weather, electrical
appliances), the Junghans Mega MF radio-controlled watch will pick
up the signal automatically at the same time the following day.
It is also possible to use a ’transmitter call’ to synchronise the time
manually, for example at a location where reception conditions are
better.
The latest time information received is stored in a time memory.
This original time continues to be kept using a high-precision
32kHz quartz movement until the time is synchronised again. The
radio-controlled time synchronisation of your Junghans Mega MF
watch not only ensures an always precise display of the time, but –
given good reception – also takes care of switching from winter to
summer time, and vice versa, fully automatically (at night).
If you travel to a country in a different time zone, changing to the
appropriate time for that area is made simple by the time zone
switching function of your Junghans Mega MF radio-controlled
watch.

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3. Automatic time synchronisation
Fully automatic time synchronisation takes place daily at 2am and
3am local time as per the analogue display. While the watch is
receiving the signal, the second hand temporarily stops. During
reception, the flashing bar shows that the reception attempt is
being made.
Following successful automatic synchronisation, the transmitter
from which the signal was picked up is permanently displayed.
Thus if no signal was picked up at 3am, no transmitter is displayed.
The date is always advanced automatically by the time signal. This
process also takes into account 29th February in leap years.
If all of the attempts at picking up a signal lead to no clear syn-
chronisation, the reception display is switched off (see also descrip-
tion of ’Reception Display’ mode in section 6.2). On any such days
without synchronisation, your watch continues to run with the
accuracy of a quartz timepiece, using the internal time memory. As
soon as the signal is picked up again successfully, your watch is
synchronised and the reception display is switched back on.
Tip: To ensure the best possible reception conditions for the
overnight synchronisation process, you should not leave your
watch near to any electrical appliances, such as TV sets, mobile
phones or cordless phones.

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4. Functions
AAnalogue display: Hours, minutes, and seconds
BLCD display: Day of week, date, transmitter display, 2nd time,
language for day of week, power control display (if power is
too low the second hand positions itself at 12 and the LCD
display flashes, alternating between the then current display
and ’Lo’).
T1 Day of week / date display adjustment, transmitter call, 2nd
time, day of week language access
T2 Time zone setting, 2nd time, day of week language
5. Selectable LCD displays
LCD display:
Date – 2nd time – Language (brief display, then switches to 2nd time)
T1 – Briefly press once:
Display switches from date to 2nd time.
T1 – Briefly press twice:
Display shows language setting
After 9 seconds, the language display reverts automatically to
showing the 2nd time.
If power is low, the LCD display shows the seconds (flashing in
alternation with [Lo]). The second hand stops at 12 o’clock. By press-
ing T1, however, you can still switch to date or 2nd time.

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6. Description of watch functions and how to use them
6.1 Second time
The 2nd time function gives you the option to display another time
in the display that independent of the analogue time (e. g. if you
are on holiday in another time zone and want to see the time at
home).
Press the T1 button repeatedly until the 2nd time is digitally
displayed on the LCD. The 2nd time can be set in 30-minute steps
using the T2 button.
To do this, with the 2nd time displayed on the LCD, press the T2 but-
ton. The 2nd time starts to flash. Each press of the T2 button then
lets you advance the 2nd time by 30 minutes. If you hold down the
T2 button, you can set the 2nd time in fast forward mode.
6.2 Reception display
The reception display shows you whether the watch has syn-
chronised itself with any of the transmitters. The LCD display has
4symbols for doing this that indicate the 4 transmitters from
which a signal can be received:
DCF 77 (Europe)
JJY 40 (Japan)
JJY 60 (Japan)
WWVB (USA)
If the reception display is shown on the LCD, the watch has picked
up the signal properly during the overnight automatic synchroni-
sation. If all of the reception times on the LCD display are switched
off, this means that due to poor reception conditions the watch
was not able to synchronise automatically. The next time that a
signal is successfully picked up from one of the 4 transmitters, the
reception display will be shown again.

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6.3 Manual time synchronisation (transmitter calls)
Your Junghans Mega MF radio-controlled watch can also be syn-
chronised manually, by performing what is called a ’Manual trans-
mitter call’.
You do this by pressing the T1 button for over 3 seconds. The
second hand starts to move and positions itself at 12 o’clock. In
parallel with this, the hour and minute hands continue to show
the current time. The reception phase then starts. The reception
display flashes on the LCD for the transmitter with which synchro-
nisation last took place and, instead of the date, the second’s [00]
are now digitally displayed. Please put the watch down while the
signal is being received as moving the watch around while it is try-
ing to update can cause reception failure
If synchronisation with the transmitter is not possible, all of the
other transmitters are then checked for possible reception of any
of their signals. As soon as a signal has been picked up, the digital
seconds on the LCD display start to advance. When the watch has
picked up the signal, the hands automatically set themselves at
the transmitter’s local time and the second hand advances to the
current second. On the LCD the date is shown and the transmitter
that was successfully received is represented by the corresponding
reception display.
Should you be in a time zone different from that of the transmitter
the watch picked up, then after one-off synchronisation you will
need to set the applicable local time for that location using the
time zone adjustment function.
The time zones displayed when picking up the signal from the
respective transmitters are as follows:
Transmitter Time zone displayed
DCF77 (Europe) CET or CEST
WWVB (North America) Pacific time
JJY40 Japanese local time
JJY60 Japanese local time
If you wish, you can interrupt the manual synchronisation process,
as soon as the second hand is in the 12 o’clock position.
To do so, briefly press the T1 button. The second hand then returns
to the original time.
Please note that manual synchronisation is not possible if battery
power is too low and the [Lo] symbol is showing on the display.

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6.4 Time zone adjustment
The Junghans Mega MF radio-controlled watch can pick up the sig-
nals from the DCF77, WWVB, JJY40 and JJY60 transmitters. Within
the transmitter coverage areas your watch will thus reliably display
summer or winter time respectively. If you travel to a country in
another time zone, you can have the local time there displayed as a
2nd time in the lower section of the display (to set this, see ’Second
time’ section) and/or adjust the analogue time shown to the local
time.
You do this by pressing the T1 button repeatedly until the date is
shown on the LCD display. You then press the T2 button.The hour
is now also shown digitally on the LCD display (e.g.: [T12] for 12
noon). You adjust the time zone, and thus also the hands, to the
time in the zone in question by pressing the T2 button again. You
can use the digital hour display to help you set the correct time.
Repeatedly pressing the T2 button enables you to set the hour in
fast forward mode. You can set all time zones using the T2 button.
As you do so, the date, if necessary, is also automatically adjusted.
If you want to set the 1st time, and thus the analogue time display,
back again to the original time, then please do so by following the
same procedure.
6.5 Set language (day of the week display)
The language for the day of the week display on your Junghans
Mega MF radio-controlled watch is set at the factory to German.
To change the day of week display to a different language, press
the T1 button until [DE] for German (Deutsch) is shown on the LCD
display. By pressing briefly on the T2 button, you can then change
the date display to English. [En] for English will now be showing on
the LCD display.
7. Restart / getting started
Following a change of battery, your watch will automatically begin
a restart routine. After you insert the battery, the hands will move
to the 12 o’clock position and your watch will start trying to pick up
the time signal. As it does so, the reception symbol of the transmit-
ter it is currently trying to pick up flashes. As soon as a signal is
being received, the seconds on the LCD display start to advance.
After a few minutes, if the reception process has been successful,
the watch automatically sets itself to the correct transmitter time.
xOn successful reception of the DCF77 transmitter, CET local time
is shown, the reception display for the DCF77 is activated on the
LCD and the date is displayed with the day of the week in
German.

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xOn successful reception of the WWVB transmitter, the Pacific
time zone is shown, the reception display for the WWVB is acti-
vated on the LCD and the date is displayed with the day of the
week in German.
x∑ On successful reception of the JJY40 or JJY60 transmitter,
Japanese local time is shown, the reception display for the JJY40
or JJY60 is activated on the LCD and the date is displayed with
the day of the week in German.
If the watch goes 30 minutes without picking up a signal, the
reception process is aborted to save power. The hands remain in
the 12 o’clock position and 2 flashing dashes [--] are shown on the
LCD display.
To get the time displayed nevertheless, you will need to set your
watch manually to the current time (known as a ’manual start’). It
will then run like a normal quartz watch.
7.1 Manual start
After an unsuccessful restart (at least 30 minutes with no recep-
tion from any transmitter), you can trigger the manual start routi-
ne. This can also be done during the restart process.
After the hands have reached the 12 o’clock position in the restart
routine, please press button T2. The watch is now in manual start
mode.
The receiver for the transmitter has been switched off and the
second hand now begins to move. Two dashes [--] are shown on
the LCD display.
With each further press of the T2 button, you are able to adjust the
time one step forward. One step equals one minute. The minutes
are shown digitally on the LCD display to help you.
If you hold down the T2 button, you go into fast forward mode and
the hands start to go around rapidly. Set in this way the time that
you want.
If you don’t press a button for 9 seconds, the display reverts to nor-
mal and 2 flashing dashes [--] are shown on the LCD.
After setting the watch by the manual start routine, it is not possi-
ble to display a date. This cannot be done until the watch has suc-
cessfully synchronised with one of the time signal transmitters.
By pressing button T1 you can have the 2nd time shown on the LCD
display. Adjust the 2nd time as described in section 6.1.
When in manual start mode, your Junghans Mega MF radio-
controlled tries every 6 hours to pick up a time signal. As soon as
successful synchronisation has taken place, the time display is
updated and from this point on the date too is also available.

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8. General information
xServicing, such as repairs to the glass, seal or wrist strap should
only be carried out by a specialist watch retailer.
xPlease have the seals and the glass inspected regularly by an
expert, approx. every 2 years.
xIf condensation gets into your watch, have it inspected by the
Customer Service Unit without delay. Water inside the watch
can damage it.
xYour watch is fitted with a quality wrist strap that has undergo-
ne multiple inspections in our factory. If, however, you decide to
change the wrist strap, please fit a new one of the same quality,
preferably an original Junghans strap.
xClean your watch and wrist strap with a dry or slightly moist
cloth. Caution: do not use chemical cleaners (e.g. benzine or
paint thinners). These may harm the surface.
Declaration of Conformity
Junghans Uhren GmbH herewith declares that this radio-control-
led product conforms to the principle requirements and other
relevant stipulations of Directive 1999/5/EC.
A corresponding declaration of conformity can be requested from
[email protected].
xWater resistance:
Marking Instructions for use
Washing, Diving
rain, without a
splashes Shower Bath Swimming wetsuit etc.
No mariking No No No No No
3 atm Yes No No No No
5 atm Yes No yes No No
10 atm Yes Yes Yes Yes No
The level of ’water resistance’applies only to brand new watches. External influences
can however affect this. Please have your watch checked regularly.

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9. Technical information
Time taken to self-set with
good reception (DCF) Approx. 3 minutes
Time zone adjustment range + 12 hours
– 12 hours
Switching from CET to CEST and vice versa automatic
Time comparison with the time
signal transmitters 02:00 and 03:00 hours
Operating temperature 0° to 50°C
No licence fee. Approved by the German Post Office.
Subject to technical modifications