Sony DHC-AZ3DM / DHC-AZ7DM / HCD-AZ3DM / HCD-AZ7DM (serv.man2) Service Manual ▷ View online
5
5
1-2. Start up of USB memory section
USB
memory
controller
(IC801)
System
controller
(IC401)
DISPLAY
SDRAM
(IC802)
FLASH
MEMORY
(IC803)
USB board
RESET signal
Operating
program
program
When the set turns on, System controller(IC401 97pin) outputs RESET signal to
USB memory controller (IC801 72pin ) and FLASH memory (IC803 12pin).
Reset signal is “L” output.
Reset signal is “L” output.
By this Reset signal input, USB memory controller (IC801) boots up.
USB memory controller starts to read the operating program from FLASH
memory (IC803) through the data bus line.
6
6
1-3. Output of USB voltage
USB
memory
controller
(IC801)
System
controller
(IC401)
DISPLAY
SDRAM
(IC802)
FLASH
MEMORY
(IC803)
USB board
USB
storage
media
USB
Power
Control
(IC812)
1
2
3
USB connector
on the front panel
on the front panel
When USB memory controller (IC801) starts operation, USBA_PWE is set to
“H”.
“H”.
By this signal output, USB power control (IC812) starts to output 5V to USB
1pin line.
1pin line.
This voltage is for other USB media.
7
7
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.
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.
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.
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.
communication with USB line.
8
8
(Note) Detection of USB storage media
The chassis part of USB storage media => USB GND
When USB storage media is inserted to “USB MEMORY” port,
“GND” of HCD-AZ7DM => pin 4 of USB
=> USB storage media chassis
=> USB_A_DET terminal of System controller (IC401 18pin),
=> USB_A_DET terminal of System controller (IC401 18pin),
When System controller detects the USB storage media insertion,
“USB CONNECT” is shown on the display.
“USB CONNECT” is shown on the display.
Chassis part of
USB storage media
For most of USB storage media, the chassis part which is inserted to USB
terminal is connected to USB GND pin (4pin).
HCD-AZ7DM detects the insertion of USB storage media by this characteristic.
When USB storage media is inserted to “USB MEMORY” port, USB GND pin
(pin 4) is connected to GND of HCD-AZ7DM. Then, the chassis of USB storage
media is also connected to GND.
media is also connected to GND.
System controller detects the insertion of USB storage media with USB_A_DET
terminal of System controller (IC401 18pin).
(L: USB media is connected, Open: No connect)
When System controller detects the USB storage media insertion, “USB
CONNECT” is shown on the display.
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