Replacing Batteries; Setting Up The System - AKG HEARO 777 QUADRA Modo De Empleo

4 Operating Notes
Important!

4.3 Replacing Batteries

Refer to fig. 12.

4.4 Setting Up the System

14
In order to ensure the longest possible service life for the rechargeable batteries, we deliver them
uncharged. Therefore, charge the supplied batteries before first operating your headphones
system.
1. Before first charging the batteries inside the headphones, pull the protective foil out of the left-hand
earphone following the direction of the arrow.
The batteries will make electrical contact with the electronic circuitry of the headphones.
2. Check that the headphones are OFF. If the status LED (1a) is shining green, push the POWER
button (1) to switch power to the headphones off. The status LED (1a) will extinguish.
Note: As long as the headphones are ON, the batteries will not be charged.
Charging on the transmitter:
3. Check that the transmitter is connected to a
power outlet.
Since the charging function operates inde-
pendently of the rest of the transmitter circuitry,
you do not need to press the ON key (6) to
charge the batteries.
Refer to figs. 10, 1, and 2:
4. Place the headphones on the transmitter
The charging contacts on the transmitter and
those on the headphones will automatically
close the charging circuit and charging will
start.
The CHARGE label (12) on the transmitter and
the status LED (1a) on the headphones will illu-
minate red to indicate the batteries are being
charged.
The batteries will be fully charged after approxi-
mately 14 hours. (The CHARGE label (12) on
the transmitter and the status LED (1a) on the
headphones will continue shining red.)
5. Remove the headphones from the transmitter
to stop the charging. (The charging contacts
will open and the CHARGE label (12) on the
transmitter and the status LED (1a) on the
headphones extinguish.)
If you forget to remove the headphones, do not
panic. You can leave the headphones on the
transmitter for as long as you like without risk-
ing to overcharge the 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 alkaline dry batteries.
1. Rotate the ear pad on the left-hand earphone approximately 10° CCW to unlock the bayonet mount
and remove the ear pad.
2. Remove the dead rechargeable or dry batteries.
3. Insert the new batteries aligning them with the polarity symbols inside the battery compartments (3)
in the earphone.
4. Replace the ear pad on the earphone and rotate the ear pad approximately 10° CW to the point that
you can feel it has locked.
1. Remove the headphones from the transmitter.
2. Switch ON the audio source to which your transmitter is connected.
3. Press the ON switch (6) to switch the transmitter on.
The ON switch (5) will illuminate green.
The MODE and FREQ settings will be the same as those you have selected before switching the trans-
mitter off. (As delivered, the transmitter is set to STEREO mode and FREQ 1.)
The label backlighting will come on every time you switch the transmitter on even if you switched the
backlighting off before.
If there is audio signal present at the transmitter input, the LEVEL label (10) will flicker in step with the
signal.
4. Switch the headphones on by pushing the POWER button (1).
The status LED (1a) will illuminate green.
5. Press the AUTOTUNING switch (4) on the headphones.
The Autotuning function will automatically tune the receiver to the carrier frequency set on the trans-
mitter. After a few seconds, you should hear the signal in the headphones clearly and free of inter-
ference.
If your first try fails, press the FREQ key (8) on the transmitter front panel to select a different carrier
frequency and press AUTOTUNING (4) again. Be sure to stay near the transmitter during this
operation.
6. Set the VOLUME control (5) on the headphones to the desired volume level.
Note: If the transmitter signal is disturbed, e.g., by reflections (multipath reception) or shadow effects, the
headphones will automatically mute. This function eliminates interference-related noise.
Using the optional external charger:
Important: Check that the AC voltage stated on
the optional charger is identical to the AC
voltage available where you will use your
system. Using the charger with a different
AC voltage may cause damage to the unit.
Refer to figs. 11, 1, and 2:
3. Plug the charging cable on the charger into the
charging jack (2a) on the headphones.
4. Plug the charger into a convenient power
outlet.
The status LED (1a) on the headphones will illu-
minate red.
The batteries will be fully charged after approxi-
mately 14 hours. (The status LED (1a) on the
headphones will continue shining red.)
5. Disconnect the charging cable from the
charging jack (2a) on the headphones to stop
the charging.
The status LED (1a) on the headphones will
extinguish.
If you forget to disconnect the charging cable,
do not panic. You can leave the headphones
connected to the charger for as long as you like
without risking to overcharge the batteries.