Icom IC-M504 Service Manual page 6

SECTION 2
• LOGIC BOARD
• MAIN UNIT
Antenna switch
(D14, D21: L308CCB)
1st mixer [DSC channel]
(D39: HSB88WS)
1st mixer
[Normal channels]
(D32: HSB88WS)
APC circuit
Q14: KTA2015
Q15: FMW1
TX/CH70-RX VCO
RX VCO
PLL IC
(IC1: µPD3140GS)
FM IF IC [Normal-RX]
(IC2: TA31136FNG)
FM IF IC [CH70-RX]
(IC14: TA31136FNG)
INSIDE VIEWS
• AF UNIT
2 - 1
Dimmer control circuit
Q1: 2SB1201
Q2, Q3: KTC4075
System clock oscillator
(X1: CR-790A)
Reset IC
(IC4: S-80942CNMC-G9C)
CPU
(IC1: M30622MEP-326GP)
Photo coupler
(IC6: PC357N6J000F)
EEPROM
(IC3: HN58X2464TI)
AF power amplifier
(IC9: LA4425A)
S5V regulator
(IC10: KIA7805API)
DSC decorder*
(IC15: NJM2211M)
Microphone amplifier*
(IC7: NJM4558M)
Electric volume*
(IC13: M62429FP)
AF power amplifier
for hailer
(IC14: LA4485-E)
*Located under side of the point