TAV-L1 (serv.man5) - Sony Audio Service Manual (repair manual). Page 14

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2-2. Wake up operation
MAIN SYSTEM 
CONTROLLER
(IC602)
(1) Detecting of wake up input
SUB SYSTEM 
CONTROLLER
(IC901)
TOUCH 
PANEL
SENSOR
IC1501
TOP
PANEL
KEY
(S1231,
S1232)
TOUCH 
PANEL
SIRCS
SIRCS_IN
3pin
SIRCS_OUT
4pin
KEY0-KEY2
94, 95, 97pin
KEY3 83pin
REMOTE
CONTROL
RECEIVER
(IC841)
Please refer to Block diagram on page 55 in the Service manual.
In standby mode, MAIN SYSTEM CONTROLLER (IC602) checks Top panel
key input.
And, SUB SYSTEM CONTROLLER (IC901) receives the remote control signal 
and transfer to MAIN SYSTEM CONTROLLER (IC602).
MAIN SYSTEM CONTROLLER checks this SIRCS input, too.
When wakeup signal is detected from these inputs, MAIN SYSTEM 
CONTROLLER starts wakeup operation.
After wake up operation, MAIN SYSTEM CONTROLLER starts to check Touch 
panel input.
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