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(1) When AC cord is connected to AC outlet, AC voltage input to SUB 
TRANSFORMER(T1901) through Fuse (F1902).

(2) U-COM 3.3V is supplied to SYSTEM CONTROLLER(IC5006) and 
SYSTEM CONTROL boots up. 

(3) If the operation mode is set to “Network Standby mode”, Network circuit 
operates with 1.42V and so on.

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(1) SYSTEM CONTROLLER(IC5006) operates with X5001(4MHz).

(2) SYSTEM CONTROLLER(IC5006) reads the last condition information from 
EEPROM(IC5003).

Ex. Last function, volume position, etc.

(3) By detecting POWER key input or Remote commander key input signal, 
SYSTEM CONTROLLER(IC5006) starts operation mode.

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(1) SYSTEM CONTROLLER outputs POWER_RY signal(10pin) to turn on 
RY1901 and AC voltage is supplied to MAIN POWER TRANSFORMER (T1).

(2) MAIN POWER TRANSFORMER outputs voltage through fuses. 

(3) Each voltages are supplied through REGULATORs.

(4) Pulling off the AC cord is checked by AC voltage input. AC voltage input is 
checked by SYSTEM CONTROLLER (IC5006 11pin) through Detection 
switch(Q1901). If AC voltage decreases, SYSTEM CONTROLLER starts shut 
down operation. 

Ex. Muting, write the last function information to EEPROM, etc.. 

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This part explains SYSTEM CONTROL related circuit.

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