LG CM9520, Service Manual

Page: 36 / 109

3-7
Does the customer select correctly
the CD function he or she wants to listen to?
Make sure to put on a CD disc on the tray.
YES
NO
Is a CD disc put on the tray correctly? Make sure to insert the CD disc upside down.
YES
NO
Does the unit display “NO DISC” on VFD
when a disc is inserted on the tray?
Place the disc with the label
or printed side facing upwards.
YES
NO
Does the customer use
the supported mp3 or WMA music files on the disc?
Check the playable disc.
Make sure that the file extensions
are “.mp3” or “.wma”.
YES
NO
When the unit searches music files in a CD disc,
are the following messages displayed on VFD?
“SELECTED” “TRACKING #” and “TIME”
Make sure to check
the supported MP3/WMA music file on the CD disc.
Refer to the owner’s manual.
YES
NO
After selecting a track number using the SCAN or
DISC# button, press PLAY button and 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 the sound quality good to listen to the music?
Make sure to clean CD discs with a commercially
available cleaner. If the surface of the disc is polluted
or scratched, the sound quality can become bad
or the customer can not listen to the music.
YES
YES
NO
Are the sound spectrum level LED’s
on the left and right side of the front panel
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.
NO
6. NO SOUND IN CD FUNCTION
TRAINING MASTER