Trouble Shooting Chart
Microphone can not SW off
Can only read DVD disc
Solution: check if any short circuit at signal
link
Solution: replace Q504
Solution: check and replace Q503 if
defected
GO
NO
NO
Cannot turn OFF the voice
from Microphone
Check points: select karaoke on/off
on the setup menu.
Enter the setup menu to select
karaoke on/off and check the voltage
Check points: collector terminal of
Q504 on power board
Observe: check the voltage is
over 0v7
YES
YES
4-9
Solution: Replace the loader
Can only read DVD Disc but
not VCD and CD
YES
