DHC-AZ3DM, DHC-AZ7DM, HCD-AZ3DM, HCD-AZ7DM (serv.man2) - Sony Audio Service Manual (repair manual). Page 14

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14
14
(Note) Hang up of USB circuit
USB
memory
controller
(IC801)
System
controller
(IC401)
DISPLAY
SDRAM
(IC802)
FLASH
MEMORY
(IC803)
USB digital circuit
If there is a problem in USB digital circuit, the USB circuit operation stops. Then, 
the display never shows USB related messages.
Ex.)  No Media, ACCESS 
In this case, please check around the USB digital circuit. (IC801, IC802, IC803)
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