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QT-MP3W
Whether RF wave-
form is ok (ftgure4)
YES
Check whether
disc is good
YES
Confirm output
whether have noise
or wrong song
NO
Servo system ok
Check circuit of SA9618 of
NO
RF
YES
Confirm Disc
format whether
CDDA or not
YES
Confirm pin no. 24 output
is square wave of 88.2K is
stabil or not
YES
C2 cannot rectify if many
many wrong data during
read the Disc, cause wrong
song selected. Please
check Disc and whether
Pick-up is aging or not.
6
U901 12
CH1
NO
NO
Confirm pin no.24 output
shows high voltage
impulse or not.
YES
6 – 3
˜
0.2v
A>0.2µs
Whether 56pin
output raise any high
voltage impulse or
not
YES
C2 cannot rectify when raise
many wrong data under
reading Disc, as a result, which
exist any wrong songs. Please
check Disc and whether Pick-
up is aging or not.
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