Sony STR-DH740 Operating Instructions Manual page 12

Note
These indicators may not light up depending
on the speaker pattern setting.
L USB
Lights up when iPod/iPhone or USB
device is detected.
* When playing a Dolby Digital or DTS format
disc, make sure that you have completed the
digital connections and that INPUT MODE is
not set to "Analog" (page 54) or "Analog
Direct" is not selected.
12
GB