LG CM9520, Service Manual

Page: 33 / 109

3-4
Does the customer select correctly
the PORT. IN function he or her wants to listen to?
Make sure to connect a cable
between the PORT. IN jack of the unit and the Audio
output jack of a portable device like a MP3 player.
YES
NO
Is “PORT. IN” displayed on VFD?
Make sure to select the PORT. IN function
pressing the AUX/IPOD/PORT. IN button.
YES
NO
Turn the master volume clockwise
for the volume up.
The volume level LEDs around the master volume
will be turned on more and more
while turning it clockwise for the volume up.
YES
NO
Is there any sound
from the selected input source?
Refer to a portable device’s instruction manual
and then check if there is sound output
from it connecting another audio system.
YES
NO
Are the sound spectrum level LED’s
on the left and right side of the front panel
being changed up and down
according to the sound input gain?
The sound spectrum level LED’s will be turned on/off
repeatedly at regular intervals. A speaker cable
might be short-circuited with the chassis ground.
Be careful not to be shorted each other.
YES
NO
Are the speaker cables connected correctly
between the speaker terminals on the unit
and the speakers?
Make sure to connect the cables to each specified
connector tightly on the unit.
Connect the woofer cables to the WOOF SYSTEM
connectors on the rear panel.
YES
NO
The sound is output
from the speakers.
YES
Sound OK
3. NO SOUND IN PORT. IN FUNCTION
TRAINING MASTER