LG RH4820W Service Manual page 60

System Check
Load tray without inserting disc.
Does tray operate normally?
YES
Does pick-up move to inside?
YES
Does pick-up lens move
up/down?
YES
Does laser turn on?
YES
After eject tray, Insert CD-ROM Disc
and check rotation
Does disc rotate
continuously and the drive recognize
the disc?
YES
After eject tray, insert DVD Disc
and check rotation.
Does disc rotate
continuously and the drive recognize
the disc?
YES
After eject tray, Insert DVD±R/RW Disc
and check rotation
Does disc rotate
continuously and the drive recognize
the disc?
YES
OK
NO
Go to "Tray operating is abnormal"
NO
Go to "Sled operating is abnormal"
NO
Go to "Focus Actuator operating is
NO
Go to "Laser operating is abnormal"
NO
Go to "Recognition fail Case1"
(CD-ROM Disc)
NO
Go to "Recognition fail Case2"
(DVD Disc)
NO
Go to "Recognition fail Case3"
(DVD±R/RW Disc)
3-80
abnormal"