AKG HEARO 777 SURROUND Mode D'emploi page 16

8 Troubleshooting
Symptom
No sound. 1.
2.
3.
4.
.
5.
6.
7.
CHARGE LED 1.
does not light. 2.
3.
Mono sound. 1.
2.
Noise. 1.
2.
3.
4.
Distorted sound. 1.
2.
3.
Intermodulation 1.
noise.
2.
Headphones receive 1.
unwanted trans-
mitters.
Overemphasized 1.
bass or treble
range:
16
Possible Cause
AC adapter is not connected to transmitter
and/or AC outlet.
Transmitter is OFF or not connected to audio source.
Connected audio source is switched off.
Volume control on audio source is set too low
Batteries are low.
Headphones are switched off.
Volume control on headphones/transmitter is at zero.
Transmitter is not connected to AC power.
Batteries are not correctly aligned with polarity
marks.
Headphones are incorrectly positioned on trans-
mitter.
Connected audio source operates in mono
mode.
Transmitter is not correctly connected to audio
source.
Transmitter and receiving frequencies are not
identical.
Audio level at transmitter input is too low.
Input signal is noisy.
Batteries are low.
Audio level at transmitter input is too high.
Transmitter and headphones carrier frequencies
do not match exactly.
Batteries are low.
Electrical appliances with poor interference pro-
tection.
Audio source or sound carrier defective.
A neighbor uses similar UHF headphones.
Bass or treble control settings on audio source.
Remedy
1. Connect AC adapter to transmitter and/or AC
outlet.
2. Switch transmitter on or connect to audio source.
3. Switch audio source on to feed signal to
transmitter input.
4. Increase audio source volume to the point that
transmitter switches back on.
5. Charge batteries.
6. Switch headphones on.
7. Set volume control to desired level.
1. Connect transmitter to AC power.
2. Check orientation of batteries in battery compart-
ment.
3. Place headphones on transmitter correctly.
1. Switch audio source to stereo mode.
2. Check cable connection between transmitter and
audio source.
1. Press AUTOTUNING switch on headphones or
use FREQ. ADJUST control to select different
carrier frequency and press AUTOTUNING on
headphones.
2. Turn up audio source volume control and/or
INPUT LEVEL control on transmitter.
3. Check audio source.
4. Charge batteries.
1. Turn down audio source volume control and/or
INPUT LEVEL control on transmitter.
2. Use FREQ. ADJUST control on transmitter to
change carrier frequency and press
AUTOTUNING switch on headphones.
3. Charge batteries.
1. Switch off any "suspicious" appliances (if
possible).
2. Check audio source or sound carrier.
1. Use FREQ. ADJUST control on transmitter to
change carrier frequency and press
AUTOTUNING switch on headphones.
1. Readjust bass or treble controls.