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4
Is playback
NO
possible?
Is playback sound
OK?
YES
Press eject key
and remove ROM disc.
NO
Can RAM disc
be inserted?
YES
Is UTOC
NO
read and disc data
displayed?
YES
Play track
1 of a previously
NO
recorded MD.
Is playback sound
OK?
YES
Insert
a recordable MD.
NO
Is recording
possible?
YES
Operation complete.
Is output of
IC3 pins 61 ~ 65 OK
during playback?
YES
Faulty audio circuit
5
(To two pages before)
After TOC is read,
does traverse move
to UTOC?
YES
Faulty IC1
Is shape
NO
of magnetic head
OK?
YES
Is there
NO
output from CN8
TP110 and
TP111?
YES
Faulty magnetic head
IC3 pin 61
F=16.9344MHz
IC3 pin 62
T 0.36 s.
NO
IC3 pin 63
T 23 s.
Faulty IC3
NO
See "Traverse Operation"
(next page).
Faulty magnetic head
Is output
NO
of IC3 pin 73 OK?
YES
Faulty magnetic
head circuit
IC3 pin 64
3.2V
3.2V
P-P
0V
0.5 s. 1V/DIV.
IC3 pin 65
3.2V
3.2V
0V
0V
T 11 s.
3.2V
0V
3.3V
0V
Faulty IC3
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