Icom IC-A24 Service Manual page 32

SECTION 10 BLOCK DIAGRAM
Q21 D18
UNR9210J MA785
Q18
ANLC ANL ANL AM 2SC4211
SW DET
Q61
UNR9210J
AGC
SW
(A01)
AGCOFF
IC2
TC4W53FU
WXC
AM/FM
DETMUTE SW
Q19
UNR9215J
VOR
SW
Q15 XP4315 IC12a NJM2902V
VOR
BIAS
CTRL
IC12d NJM2902V
BPF
BUFF
IC11a NJM2903V IC13a NJM2904V
IC12b NJM2902V LIMIT FM PHASE
BPF LPF
AMP DET SHIFT
IC12c NJM2902V D16 MA2S111 IC13b NJM2904V
IC11b NJM2903V
AMP
Q13 2SC4211
[IC-A24/A24E] only
D17 MA2S111
DS1
A0280
LCD
DS2, DS3 Q8, Q9
SML-A12MT×2 UNR9213J×2
LCD
LED
BACK-
DRIVE
LIGHT
DS5 - DS10 Q1 2SB1132
SML-512MW×6 Q2 2SC4211
CPU
KEY
LED
BACK-
DRIVE
LIGHT
IC1
µPD78F0338GC
VOL
UP
DIAL
E
DN
CHASSIS UNIT
KS0~3
KR0~4
X1
CR-747
(9.8304MHz)
D18 MA2S077
KEY INITIAL
RESET
MATRIX MATRIX
D1 MA2S111 D5 MA24111 [IC-A24/A6] only IC2 BD5245G
D2 MA6S121 D6 MA2S111 [IC-A24/A24E] only
R5S
Q16 2SC4215 Q15 2SC4215
D40 1SV271 D41 1SV271
Q17
IF 2SC4215 IF IF
AMP AMP AMP
Q14
2SD1819A
AGC
AMP
X1 FM
NOISE
CDBC450CX24 DET DET
+5V
IC3
TB31207AFN
PCK,PDATA,PSTB
RSSI PLL
AMP
IC
X2
IC13 NJM2107F
CR-791
(29.6MHz)
LOOP
FIL
Q45
LV 2SK880
DET
VCO
+5V
IC14a NJM2903V RIPPLE
FIL
CMP
IC14b NJM2903V
CMP
SHIFT
RESISTOR
TEMPERATURE
DETECT
IC7 S-24CS64A0I
EEPROM
DCIN
Q3 2SC4617
D7 MA8082
D8 MA2S111
DCC EXT-DC
SENS.
VIN
Q4 2SB1182
+5V
Q6 UNR9110J
IC16 Q7 XP1501
S-812C50BMC D10 MA2S111
+5V
CPU5V +5
CURRENT
REG REG
AMP
IC3 XC6202P502PR
10 - 1
FI2
CFWCA450KDFA
CERAMIC 0.450MHz
BPF
R5S
R5S
IC1 TA31136FN
30.050 MHz
IF IF
XTAL
S OUT
AMP
AMP BPF
Q13
2SC4215 FI1
D42 1SV271 FL-378
ELECTRO-
SCK,SDATA
NIC
DA2STB
VOLUME
IC17
M62363FP
Q29
2SC4403
BUFF
Q58 2SC4226
D38, D48 HVC350B×2
Q60 Q28
2SC4226 2SC4403
TX-VCO
BUFF BUFF LO-SW
RX-VCO
D6, D17 MA77×2
Q59 2SC4226 RX VCO
D39, D45-D47 77.950 - 106.925 MHz
MA2S304×4 TX VCO
118.000 - 136.975 MHz
Q57 XP1113 +5V VCC
SW
R5S T5
Q20 UNR9115J Q7 2SB1132
R5S T5 Q8 2SC4211
Q33 2SC4116 REG REG D7 MA111
IC5 IC16
D/A
BU4094BCFV M62343GP
RF UNIT
LOGIC UNIT
D52 MA2S111
JACK
Q5 UNR9210J DETECT
D11 MA2S111
CLONE IN CLONE
CLONE OUT I/O
Q10 Q9
2SD1819A 2SD1819A
AGC AGC
AMP R5S AMP
D14-D16, D44 D13
Q12 MA2S304×4 MA2S304
3SK299
RF
BPF BPF ATT
AMP
Q11 3SK293 D29
D43 MA2S077 1SV271
LO FREQ.
Rx 77.950 - 106.925 MHz
131.600 - 133.225 MHz
T5 VCC
Q6
D5, D51 D4 Q3
2SC4403
1SV246×2 1SV246 RD01MUS1
MOD ALC PRE PWR
BUFF DRIVER
ATT ATT DRIVE AMP
Q4
2SC3357 Q2
RD12MVS1
Q5 Q1
2SC4211 XP1401
AM PWR ALC
CTRL AMP
AO3
AO2
VOLT
IC18c IC18b IC18a IC17 IC15 AN6123MS
LMV324IPW LMV324IPW LMV324IPW M62363FP IC19 NJM2107F
ELECTRO-
ALC
NIC
LPF LPF BUFF
AMP
VOLUME
ALCC ALC
CONTROL
Q35 2SB1201
Q36 XP1501
AFC AF AMP
REG
IC18d IC17
LMV324IPW M62363FP
ELECTRO-
PWR
BUFF NIC
AMP
VOLUME
D30 1SS400
EXT-V
DETECT
HV
VCC
D31 1SS400
BATT-V
DETECT
VOLTAGE LINE
COMMON LINE
DATA LINE
RX LINE
TX LINE
CHGC/CHGIH
ANT
Tx 118.000 - 136.975 MHz
CHASSIS
Rx 108.000 - 136.975 MHz
161.650 - 163.275 MHz
D1, D8, D9
HVU131TRF×3
ANT
LPF
SW
LPF
POWER D2, D3
DET MA728×2
Q56 XP4601
D37 MA2S111
Q25 2SB1132
D23 MA133 D27 MA111
Q26 UNR9211J
J2
EXT-MIC
REG
EXT MIC
D36 MA2S111
Q50 2SA1586
EXT PTT
DETECT
IC17 Q51
M62363FP UNR9211J LOGIC UNIT
ECM
ELECTRO-
MIC MC1 EM-140
NIC
MUTE
VOLUME
D19 MA8051
Q16 UNR9213J
Q52 MIC
XP4315 CONTROL
INT SP
IC6
J5
TA7368F
EXT SP
Q24 HAT1024R
D19 RB060L
D22 MA2S728
J1
DC SW
EXT DC-IN
Q40 2SA1588
BATT Q22 2SB1201
CHARGE D21 MA133
Q41 2SC4617
Q39 UNR9213J
D20 SB07-03C
D32 MA2S111
7.2V
BATTERY PACK