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3. Troubleshooting Guide (In the Initial Lead-in Operation Mode)
Reset or Power On.
Check Power Voltage,
Reference Electrical Potential
and GND.
A
Does LED light?
YES
B
Does Pick-Up move to
the inner track?
YES
C
Does Disc rotate?
YES
NO
Does "H" output in IC401
pin
?
YES
Check and replace R318,
R323, Q307 and LD301.
NO
Does the signal appear in
the IC401 pin
,
YES
Does the signal appear in
the TP1, TP2?
YES
Replace MD Assy.
(Sled Motor is defective.)
Does the signal appear
NO
in the FOK(TP10),
IC501 pin
?
YES
Does the signal appear in
IC501 pin
?
FEO
SENS
YES
Dose the signal appear
in the MDP(TP17),
IC501 pin
?
YES
Does the signal appear in
IC203 pin
(A3),
(A2) and
(A1)?
YES
Replace MD Assy.
NO
Is the CLOCK Frequency
of X401 16.93MHz?
Replace IC401
NO
Replace IC401
?
NO
Replace IC203
NO
Replace IC501
NO
Replace IC501
NO
Replace IC501
NO
Replace IC201
NO
Replace
X401.
YES
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