DHC-AZ3DM, DHC-AZ7DM, HCD-AZ3DM, HCD-AZ7DM (serv.man2) - Sony Audio Service Manual (repair manual). Page 7

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1) Last function
Turn off in USB MEMORY mode   => Turns on again 
2) Key input
Function key input by Remote or main body
3) Insertion of USB storage media
USB storage media is inserted to USB MEMORY port 
1-4. A trigger to change to USB MEMORY mode
There are three types to change the function to “USB MEMORY”.
1) If  the last function is USB MEMORY when the set shut down, System 
controller sets the function to USB MEMORY automatically when the set starts 
up.
2) When System controller (IC401) detects key input from Remote commander 
or main body to change the function, System controller change the function to 
next one.
3) When USB storage media is inserted to “USB MEMORY” port, System 
controller detect the insertion and change the function automatically.
When the function is set to “USB MEMORY”, HCD-AZ7DM starts the 
communication with USB line.
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