27
3. Troubleshooting Guide (In the Initial Lead-in Operation Mode)
Reset or Power On.
Check Power Voltage,
Reference Electrical Potential
and GND.
Does LED light?
Does Pick-Up move to
the inner track?
Does “H” output in IC401
pin ?
Is the CLOCK Frequency
of X401 16.93MHz?
Check and replace R318,
R323, Q307 and LD301.
Does the signal appear in
the IC401 pin , ?
Replace IC401
Replace IC401
Does Disc rotate?
Does the signal appear
in the FOK(TP10),
IC501 pin ?
Replace IC501
Replace IC501
Replace IC501
Replace IC201
Does the signal appear in
the TP1, TP2?
Replace IC203
Replace MD Assy.
(Sled Motor is defective.)
Replace
X401.
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
A
B
C
48
45
106
46
Dose the signal appear
in the MDP(TP17),
IC501 pin ?
115
Does the signal appear in
IC203 pin (A3),
(A2) and (A1)?
Replace MD Assy.
Does the signal appear in
IC501 pin ?
95
2
7
4
FEO
SENS
