Samsung TS-H663L, SH-S223L user manual Led, Meaning

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SH-S223L(TS-H663L)Light Scribe		English

LED	Meaning
Disc Lead-In	Green: Blinks every 0.3 seconds.
Writing	Green: Blinks every 0.3 seconds.
Reading	Green: Blinks every 0.3 seconds.
Standby	Off
No Disc	Off

The indicator light turns off when the drive is not in use (standby) after disc lead-in.