3-21
ELECTRICAL TROUBLESHOOTING GUIDE OF CD PART
5-3. READING OK CHECK #C (= “NO DISC” DISPLAY)
Defective IC400.
Defective IC400.
Defective IC401.
Defective CN401.
Defective pick-up laser part.
Is 3.3 V applied
to Pin10 of CN401 laser supply
voltage check
Is 3.3 V applied
to Pin30,36,39,41,61,68,75
of IC401 RF IC supply
voltage check
Is 2.3 V
Pin18(LDO) of IC401
laser control voltage
check
NO
#C
NO
NO
Check connector
CN401 line.
NO
YES YES
YES
YES
5-4. READING OK CHECK #D (= “NO DISC” DISPLAY)
Defective IC400.
Defective IC401.
Defective CN401.
Defective pick-up spindle motor.
Does
SP+ waveform
appear at (IC400 Pin11)
waveform#4 spindle motor
drive wave.
Does
SPIN waveform
appear at (IC400 Pin6)
waveform #4 spindle dirve
wave
NO
#D
NO
Check connector
CN403 line.
NO
YES YES
YES
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