Page 1
Turn power on.
YES
NO Check power supply circuit.
(Check PN 101)
YES
YES
Does it output audio?
NO
NO
NO
Check laser circuit.
Check focus circuit.
Check disc.
Check tracking servo circuit.
w
c
Check audio circuit.
.
YES
Page 2
Fails to initial read
-
Disc motor turns.
YES
I
Does RF
waveform
appear?
Cl 08(RF)
NO
Does tracking
servo work?
Lower envelope
of Cl08(RF)
waveform is flat.
1.3v
YES
Does laser light?
I
YE
s-B
Does signal
appear at pin @
of ICI02
YES
I
Does signal appear at IC 104
“~“~“~
Pin @ and Pin @?
~ NO 441
NO
Does TE2 signal
appear at pin @
of IC102?
YES
-i
A
-0
0
NO NO NO NO
Defective IC
102, pick up
and/or short
wire.
Detective pattern.
-
Is rotation normal?
YES
Is there no dropout of RF
signal?
llllllllllllllllllllllllllllll
YES
I
YES
NO
Does GFS (ICI03 pin @)
show as below?
I
I
Defective pick-up
b
and/or connector.
-
Defective IC 102.
t-
NO
Scratch in disc
W
initial read area.
L
Defective pick-up
adjustment focus off set.
-9-
Page 3
A
0
Is “3.5V” applied to pin @ of IC 102?
Laser does not light.
NO
1
Did pickup return to
innermost circular?
r
t-
NO
Is data transferred from
MICOM IC ?
Does voltage appear at IC
104 pin RiJ, @I?
NO
b Defective MICOM.
YES
I
Defective IC 102, 104
Does it stop at inner pick
circular after shift?
YES
r-
Is power supplied to laser Q102?
(Q 102 collector: about 1.8V)
YES
YES
YES
I
Is defect output from LM
SW applied to pin 0 of
PN 103?
I OPEN CLOSE
YES1
NO
R102>>1.OV
Defective slide motor and/or
I
connector.
1
Defective LMT SW and/or
connector.
4 Defective MICOM.
+ Defective connector.
YES
\
b Defective Q 102 and/or laser.
1
Does laser current flow?
1 .OV across RI 02
R102<1.OV
-IO-
YES
Defective laser and/or
connector.
Page 4
Laser lights.
Does IC 102 out focus
search signal?
IC IO2 pin @ (FEO)
YES
I
Is focus search signal
applied to pin @ of
IC104?
NO
Defective ICI 02
b
Defective ICI 02
Confirm
initial low level?
read with
disc
Does Cl08 RF signal appear even in
YES
YES
I
Does FOK(focus ok) signal appear?
Cl08
(RF)
ICI02 pin
(FCK)
@
YES
,L
NO
NO
Open activator and/or
connector.
Open connector and/or
defective IC 102.
b
Defective IC 102.
YES
C
0
-ll-
Page 5
C
YES
Y
Does FE1 signal appear? IC 102 @ pin
-_
YES
I
Does FZC signal (focus zero cross signal)
appear at pin @I of IC 102, ISTAT (SENSE)
terminal?
YES
I
Does SMON signal appear
at pin @ of IC 103?
Does SMPO signal appear
at pin @ of IC 103?
r
Ill III
NO
NO
I
Defective Pattern between IC 102 and
IC 103.
Defective IC 102.
Open pick diode
(Focus servo turns
ON by FZC signal
of FOK mod.)
YES
I
Is drive voltage applied to disk motor?
Start mode
I
/(
YES
NO
1
Defective IC 102, 103 and/or
peripheral circuit.
Defective disk motor and/or insulation.
-12-
Page 6
WAVEFORMS OF MAJOR CHECK POINT
HF signal (RF signal ) waveform
(Test Point C108) during normal play
Focus coil drive waveform(Pin NO
U.
l When focus search failed or there is no disc on the tray
Tracking coil drive waveform (pin NO @ ,@ of IC 104)
4.
and TEO during track traverse
(1) When time division is 20nS/div
Q9, Q9 of IC 104)
2. EFM signal (pin @I IC 102)waveform
during Normal Play
.
Focus coil drive waveform(pin NO@ ,@ of ICI 04) and
FOK (pin NO @I of IC 102) when focus search is
accomplished
CHI : FOCUS COIL DRIVE
SIGNAL 2V/Div.
CH2 : FOAK
(2) When time division O.%S/div.
(During forward track traverse)
-
CHI : TEO(IC102)
1 VlDiv.
CH2 : TRACK COIL DRIVE
SIGNAL 2V/Div.
(3) When time division is O.%S/div.
(During backward Track Traverse)
/ CHI : TEO(pin NO@ of IC 102)
1 ‘JIDiv.
\ CH2 : TRACKING COIL DRIVE
SIGNAL 2V/Div.
-
CHI : TEO (pin NO @ of IC 102)
1 VlDiv.
CH2 : TRACKING COIL DRIVE
SIGNAL 2V/Div.
5. Feed motor drive waveform(pin NO 0, @ of IC 104)
During normal play
- 13-
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