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LG GWA-4164B Service Manual page 73

Dvd/cd rewritable drive
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Tray operating is abnormal.
Tray open doesn't work.
Is the
input voltage 0V at IC201
pin203 when push the
EJECT SW?
YES
Is there Tray
control signal input?
(IC301 pin 4)
YES
Is there Tray
drive voltage output?
(IC301 pin 1,2)
YES
Check the connctor (CN303).
Drive doesn't work after tray
close
YES
Is the input
voltage 0V at IC201
pin204(/OPENSW) when
push the SW1?
YES
Is the input
voltage 0V at IC201
pin63(/LOADSW) when
push the SW1?
NO
Check the connction of IC201 pin 203.
Replace the EJECT SW.
Check the connction of IC201 pin 66.
NO
Replace theIC201.
Check the communication line
between IC201.
NO
When CN303 is open, Is
there Tray drive signal
output?
YES
NO
Check the pull-up line(3.2V).
Replace SW1.
NO
Check the pull-up line(3.3V).
Replace SW1.
Replace the IC301.
77

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