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Akg K 940 AFC Manual

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5.2 Transmitter (Fig. 2)
7. AUDIO IN L/R, : audio input sockets
8. DC 9 V: DC input jack for AC adapter
9. FREQ: frequency selector
10. Charging contacts
11. POWER ON/CHARGE: tri-color LED indicating charging
and operating modes
6 Operating Notes
6.1 Connecting the Transmitter to AC Power
1. Connect the cable on the supplied AC adapter to the DC 9 V
jack (8) on the transmitter rear panel as shown in fig. 3.
2.
Check that the AC voltage stated on the AC
adapter is the same as that available in your
country. If it is, connect the AC adapter to a convenient
AC outlet (see fig. 4). The transmitter will automatically be
ready to operate.
Note that the transmitter will switch on as soon as it de-
tects an audio signal at the AUDIO IN jacks or the
jack.
6.2 Connecting the Transmitter to Your Audio
Source
You may connect the transmitter to a headphones output (mini
jack or 1/4” jack), LINE, or REC outputs.
6.2.1 Connecting to a Headphones Output
1. Before connecting the transmitter to your audio source,
switch the audio source OFF.
2. Referring to fig. 5, plug the red RCA connector (right
channel) on the supplied connecting cable into the red
AUDIO IN R socket (7) and the white RCA connector (left
channel) into the white AUDIO IN L socket (7) on the trans-
mitter rear panel.
3. Connect the stereo mini jack plug on the connecting cable
to the headphones output of your audio source (fig. 6/7).
4. If the headphones output on your equipment is a 1/4”
jack, plug the supplied mini jack to 1/4” adapter jack onto
the connecting cable. Connect the adapter jack to the
headphones output.
6.2.2 Connecting to a LINE or REC Output
1. Before connecting the transmitter to your audio source,
switch the audio source OFF.
2. Referring to fig. 6/7, plug the red RCA connector (right
channel) on the supplied connecting cable into the red
LINE OUT R or REC OUT R socket and the white RCA
connector (left channel) into the white LINE OUT L or
REC OUT L socket on your audio source.
3. Connect the stereo mini jack plug on the connecting
cable to the
jack (7) on the transmitter r
ear panel
(see fig. 8).
6.3 Char
ging the Batteries in the Headphones
In order to ensure the longest possible service life for the re-
chargeable batteries, we deliver them uncharged, inside the
headphones. Ther
efor
e, you will need to char
ge the
supplied batteries before first operating your
headphones system. Befor
e char
ging, pull the pr
otective
foil away fr
om the earphone in a straight movement.
WARNING: If you operate the headphones on dry
batteries (see section 6.4), never try to charge
the batteries using the transmitter’s charging
feature. This would cause serious damage to
your headphone system. Dispose of spent
batteries conforming to local waste disposal
rules.
1. Referring to fig. 12, place the headphones on the trans-
mitter such that the charging contacts (3) on the bottom of the
left-hand earphone will rest on the charging contacts (10) on
the transmitter.
The POWER ON/CHARGE LED (11) on the transmitter will
light red to indicate that the batteries in the headphones are
being charged. If signal is present at the transmitter audio
input, the POWER ON/CHARGE-LED (11) will light orange.
If the POWER ON/CHARGE LED (11) fails to illuminate, ro-
tate the headphones to the point that the charging contacts (3)
will rest on the charging contacts (10) on the transmitter.
The batteries will be fully charged after approximately 7
hours. (The POWER ON/CHARGE LED (11) will continue
lighting red.). You may leave the headphones on the trans-
mitter for as long as you like without risking to overcharge the
batteries.
Important: In order to maintain full battery capacity
for as long as possible, discharge the batteries
completely about once a month:
Switch the headphones on and leave them outside the
transmitter until the status LED (2) extinguishes.
Recharge the batteries as described above.
6.3.1 Optional External Charger
Alternatively, you use can the optional external charger to charge
the batteries as shown in fig. 12. The batteries will be fully charg-
ed within approximately 7 hours.
1. Plug the charger cable into the charging jack (3b) on the
headphones.
2. Plug the charger into a convenient power outlet.
The status LED (2) on the headphones will illuminate red to
indicate that the batteries are being charged.
Note: You can use the K 920 AFC headphones even while char-
ging batteries.
6.4 Replacing Batteries
The capacity of any rechargeable battery will decrease over time.
If you feel that you need to recharge the supplied batteries more
often than would be convenient, you may consider replacing the
batteries with new AAA size 1.2 V rechargeable or 1.5 V alka-
line dry batteries.
1. Remove the ear pad from the left-hand earphone as shown in
fig. 9.
2. Remove the old batteries.
3. Referring to fig. 10, insert the new batteries into the battery
compartment (4). Make sure to align the batteries with the
polarity marks inside the battery compartment.
4.
Replace the ear pad on the earphone and r
otate the ear pad
CW to the point that the ear pad will click into place.
6.5 Setting Up the System
1. Remove the headphones from the transmitter.
2. Switch ON the audio source to which the transmitter is
connected.
If audio signal is present at the transmitter input, the POWER
ON/CHARGE LED (11) on the transmitter will light gr
een.
Note: If no signal ar
rives at the transmitter input for appr
ox.
3 minutes, the transmitter will automatically switch off and the
POWER ON/CHARGE LED (11 will extinguish.
3. Set the FREQ selector (9) on the transmitter to its
center position.
4. Use the POWER switch (1) to switch the headphones on, so
that the status LED (2) will illuminate gr
een. Pr
ess the
AUTOTUNING switch (5) on the headphones.
7
ENGLISH
… 7 …


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