142
Fault feature
Cause
Elimination method
Power lamp of MP3 player
is not lit up
Reverse polarity connection of power
source
Connect to power source
Disconnected protective tube or open
power line
Check and connect power line correctly, replace
protective tube
Mute MP3 player
No power voltage
Connect the power line properly
Open loudspeaker circuit
Connect the loudspeaker circuit properly
SD/MMC card, U disk have no
corresponding format
Check the content of SD/MMC card, U disk
Light (unclear) sound of
MP3 player
Internal resistance of power source is
too big
Change power source
Poor contact of aerial plug
Adjust aerial plug
Single track of MP3 player
Open circuit of one loudspeaker line
Connect the loudspeaker line properly
