Logic Unit; Inside Views - Icom IC-A24 Service Manual

SECTION 2

• LOGIC UNIT

• LOGIC UNIT
LED drivers LED DRIVE
(Q8, Q9: UNR9213J) (Q8, Q9: UNR9213J×2)
LED DRIVE LED drivers
Q1: 2SB1132 Q1: 2SB1132
Q2: 2SC4211 Q2: 2SC4211
Clock oscillator Clock oscillator
(X1: CR-747 9.8304 MHz) (X1: CR-747 9.8304 MHz)
+5V regulator +5V regulator
(IC16: S-812C50BM-C5E-G)
(IC16: S-812C50BMC-C5E-G)
• RF UNIT (TOP VIEW)
Antenna switching Antenna switches
D8, D9: D1, D8:
HVU131TRF HVU131TRF×2
Power amplifier TX final amplifier
(Q2: RD12MVS1) (Q2: RD12MVS1)
Drive amplifier TX final amplifier
(Q3: RD01MUS1) (Q2: RD12MVS1)
ALC attenator ALC amplifier
(D4: 1SV246) (D4: 1SV246)
VCO circuit VCO circuit
ALC amplifiers ALC amplifier
IC15: AN6123MS IC15: AN6123MS
IC19: NJM2107F IC19: NJM2107F

INSIDE VIEWS

• RF UNIT (BOTTOM VIEW)
RF amplifier RF amplifier
(Q11: 3SK293) (Q11: 3SK293)
RX 1st mixer RX 1st mixer
(Q12: 3SK299) (Q12: 3SK299)
R5S regulator R5S regulator
(Q20: UNR9115J)
(Q20: UNR9115J)
PLL IC PLL IC
(IC3: TB31207AFN) (IC3: TB31207AFN)
Electric volume Electric volume
(IC17: M62363FP-650C) (IC17: M62363FP-650C)
2 - 1
VOR circuit VOR circuit
(IC-A24/A24E only) (IC-A24 only)
CPU CPU
(IC1: μPD78F0338GC-9EB) (IC1: μPD78F0338GC-9EB)
RESET IC RESET IC
(IC2: BD5245G) (IC2: BD5245G)
EEPROM EEPROM
(IC7: S-24CS64A01-T8T1-G) (IC7: S-24CS64A01-T8T1-G)
CPU5V regulator CPU5V regulator
(IC3: XC6202P502PR) (IC3: XC6202P502PR)
DC power switch DC power switching
(Q24: HAT1024R) (Q24: HAT1024R)
T5V regulater T5V regulater circuit
Q7: 2SB1132 Q7: 2SB1132
Q8: 2SC4211 Q8: 2SC4211
D7: MA111 D7: MA111
FM IF IC 2nd IF IC
(IC1: TA31136FN) (IC1: TA31136FN)
VOR switch VOR switching
Q19: UNR9215J Q19: UNR9215J
IC-A24/A24E only IC-A24 only
AGC amplifier AGC amplifier
(Q14: 2SD1819A) (Q14: 2SD1819A)
AF/FM switch AM/FM switch
(IC2: TC4W53FU) (IC2: TC4W53FU)