Read Harman Kardon CDR 20 (serv.man13) Service Manual online
NO
After eject tray, Inset CD-R Blank
Disc and reloading.
NO
Does Disc stop?
Go to "Spindle control is abnormal 3"
NO
NO
YES
Does Disc rotate
continuously as Disc recognition
is abnormal?
Go to "Disc recognition is abnormal"
YES
-12-
System Check.
Load tray without inserting disc.
Does Tray operate normally?
Go to "Tray operating is abnormal"
YES
NO
Does Pick-up move to inside?
Go to "Sled operating is abnormal"
YES
NO
Does Spindle Motor rotate in a moment?
Go to "Spindle opreating is
abnormal"
abnormal"
YES
NO
Does Lens move Up/Down?
YES
Does Laser turn on?
Go to "Focus Actuator operating is
abnormal"
abnormal"
YES
NO
Go to "Laser is abnormal"
NO
OK
After eject tray, Inset CD Disc and reloading.
Does Disc stop?
Go to "Spindle control is abnormal 1"
NO
YES
Does Disc rotate
continuously as Disc recognition
is abnormal?
Go to "Spindle control is abnormal 2"
YES
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