AKG Acoustics K 105 UHF - Manual (Page 12)

4 Operation
12
In order to ensure the longest possible service life for the rechargeable batteries, we deli-
ver them uncharged. Therefore,
charge the supplied batteries before first opera-
ting your headphones system.
The supplied batteries have been inserted into the headphones for your convenience.
WARNING: If you operate the headphones on dry batteries (see section 4.3),
never try to charge the batteries using the transmitter’s charging feature.
This would cause serious damage to your headphone system. Dispose of
used batteries conforming to local waste disposal rules.
1. Check that power to the headphones is switched off. If the green status LED (2) is
glowing, switch the headphones off with the POWER switch (1). The green
status LED (2) will extinguish.
2. Check that the transmitter is connected to AC power. If it is not, connect the transmitter
to AC power referring to section 3.2.
3. Use the supplied charging cable to connect the headphones to the charging jack (3) on
the transmitter.
The status LED (12) 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
status LED (12) will light orange.
The batteries will be fully charged after approximately 8 hours.
4. Disconnect the charging cable from the headphones and from the transmitter.
The status LED (12) on the transmitter will extinguish. If the transmitter detects an audio
signal at the input, the status LED (12) will revert to green.
Note: Since the charging current is very low, the batteries will not be overcharged even if
you forget to disconnect the charging cable. If this happens, however, be sure to dis-
connect the charging cable as soon as you can.
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 on the shelf until the status LED (2) ex-
tinguishes. Switch the headphones off with the POWER switch (1).
Recharge the batteries as described above.
1. Check that the transmitter is connected to AC power. If it is not, connect the transmitter
to AC power referring to section 3.2.
2. Disconnect the charging cable from the headphones and from the transmitter.
3. Switch ON the audio source to which the transmitter is connected.
If the transmitter detects audio signal at the INPUT jacks, the status LED (12) on the
transmitter will light green.
Important Note: If no signal arrives at the transmitter input for approx. 4
minutes, the transmitter will automatically switch off and the
status LED (12) will extinguish.
The transmitter will also switch off automatically if the signal level at the audio input is
too low. In this case, turn the volume or headphones control on your audio source up to
the point that the transmitter will switch back on.
4. Use the POWER switch (1) to switch the headphones ON, so that the green status LED
(2) will light.
If the status LED (2) on the headphones fails to light, the batteries are down. Charge the
batteries referring to section 4.1.
5. Set the TUNING control (5) on the headphones such that you will hear the signal in the
headphones clearly and free of interference.
If the signal remains weak or noisy, use the A-B-C switch (10) on the transmitter to select
a different carrier frequency and set the TUNING control (5) again as described above.
6. Set the VOLUME control (6) on the headphones to the desired volume level.
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 alkaline dry batteries.
4.1 Charging the Batteries
inside the Headphones
Refer to fig. 9:
4.2 Setting Up the System
4.3 Replacing Batteries