Icom IC-F3S - IC-F4;S Main Unit Views

F4/S
2 - 2
2-2 IC-F4/S
• MAIN UNIT
Low-pass filter circuit
Current detector circuit
RF amplifier
(Q12: 3SK239)
Crystal filter
(FI1)
T/R switching circuit
(D4: MA77)
PLL reference oscillator
(X1: 15.3 MHz)
CPU (IC8)
EEPROM (IC7)
VCO circuit
APC control circuit
Mute switch
(IC4: BU4066BCFV)
PLL IC
(IC1: µPD3140GS)
Microphone amplifier
circuit
FM IF IC
(IC2: TA31136FN)
Antenna switching
circuit (D1: MA77)
Power amplifier
(Q1: 2SK2595)
T/R switching
circuit (D3: MA77)
Expander IC
(IC10: M62354GP)
1st mixer circuit
(Q13: 3SK241 R)
TOP VIEW BOTTOM VIEW
*IC-F3/S,F4/S.doc 99.6.14 5:17 PM Page 2 - 2