STR-DA6400ES (serv.man4) - Sony Audio Service Manual (repair manual). Page 4

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4
When STB +3V is input to RESET SIGNAL GENERATOR (IC2510), 
reset signal is generated and input to SYSTEM CONTROLLER (IC2513 
131pin) through RESET SWITCH (IC2512).
SYSTEM CONTROLLER boots up by reset signal and start to read the 
operation firmware in SYSTEM CONTROLLER itself.
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