Icom IC-M424 Service Manual page 30

SECTION 9. BLOCK DIAGRAM
MAIN UNIT
HM-196
MIC
SP1
PTT PTT
KEYM KEYM
FRONT UNIT
IC701A: HV IC704:
LA4625 TC7S66FU
SP1
AF AF
INT SP
AM P MUT E
DIAL UNIT
S1
DIALA
A
DIALB
B
COM
ENT
LOGIC UNIT
VCC
Q1:2SB1201
Q 2:L2SC4081
D1:DZ2J068M I C3:TC7W53FK
DIM DSC D SC SW
CTRL DECODER
D S2-9: IC11:NJM2211M
L-C191KYCT
DCSC
LCD
DS1:8803L21012 L3V
L3V PWM
DSCENC
LCD DSCOUT
A/D
BUFF
M ODULE
IC2B:
LMV358IPW
KEY L3V
BOAR D
BEEP BEEPO
A/D
BUFF
IC2A:
L3V LMV358IPW
CI-V
ICF3 I/F IC1:STM32F100ZE X1:CR-834
CPU 7.9872MHz
IC5A/B:
TC7WH14FK
Q3:DTA114EU
Q4:L2SC4081
D3:L1SS400
IC10:
NJU7704F3
RESET
COM1TXD
BUFF
IC6:
TC7SET04FU EEPROM
Q 5:L2SC4081
Q 6:L2SA1576 L3V
IC9:
BR24T256FJ
COM1RXD
BUFF
IC7B: L3V REG
TC7WH14FK 3.3V
Q7:2SK880
IC4:
NJM2830U1-33
RX
IC7C:TC7WH14FK IC8:PC357N6
IC12:TC7SET08FU D4:L1SS400
TX
NMEAI+
NMEAI PHOT O
BUFF COUPLER NMEAI-
COMMON
L5V
DATA
NMEAO NMEAO
BUFF
Q 8:L2SC4081
Q9:DTC124EU
D5:KDS122
WDECV
MICI N R3V
LPF
Q 701:KTC4075
NOISEV SQL
AM P
IC202:LMV321DCK
5V
IC504A:
CD4066BPWR
DSCDEC AF
LPF
SW
IC702A: Q702:KTC4075
LMV358IPW
IC506B/C: IC504B:CD4066BPWR
PRE
LMV324IPW Q506:LDTC144EE
AM P
AF
BPF
SW
DETSEL
AFINM
IC503B: IC503A:
PASTBY CD4066BPWR CD4066BPWR
AF FILO AF
MUT E MUT E
RINTM O
REXTMO
IC503C: IC503D:
CD4066BPWR CD4066BPWR
AF INCOM AF
MUT E MUT E
ICINTS
WXDE C ICEXTS
IC515B:
LVM358IPW
DSCDEC IC504D: IC504C:
AF CD4066BPWR CD4066BPWR
AMP
AF AF
MUT E MUT E
I CPAS
RXSPMO
IC505:
TC7S66FU
HORNO AF
MUTE
HORNC
IC514:
M62364FP
AFVOLI V1 V4
AFVOLO
V6 V2
PCON PCON
V7 V3
IC515A:
LVM358IPW
PAVOL AF PAVOLI V8 V5
AM P
PAVOLO
DSCENC
IC502A: IC513D:
CD4066BPWR LMV324IPW
AF MI C
MUTE AM P
HV
IC506D:
LMV324IPW
MIC
AMP
5V
VCC
DSCENC
9 - 1
5V JTBM450CX70 FI204:LTWC450E1
X201
CERAMIC
BPF
I C201:NJM2591V
MAINDET FM 2ND IF
DET AMP
NOISE
NOISE
DET AMP
JTBM450CX70 FI304:LTWC450E1
X301
CERAMI C
BPF
I C301:NJM2591V
CH70DET FM 2ND IF
DET AM P
NOISE
NOISE
DET AM P
R3V
TCXO
X401:CR-923
41.883333MHz
21.25MHz
X101:CR-921
I C101:GP214D
PLL
D 21:HVC376B
D 22:L1SS400
Q 503:2SK880Y
LOINV
LOOP
BUFF
FIL
3V
SHIFT
MOD
MAINDET Q2:LDTC144EE
Q8:LDTA144EE
SQ L D1,D2:HSC277
FCON
MODC
IC901: IC902: IC905: IC904:
MICO TC7W53FK LC70301W LMV321IDCK TC7W53FK
MSENS AF NOISE AF
LPF
SW CANCELE R SW
X901
CSTCE8M19G55
IC801,802:
CD4094BPWR
EXPANDER
IC513B: IC513C:
LMV324IPW LMV324IPW
IDC
LPF
IC502B:
CD4066BPWR
AF
MUTE
IC702B:LMV358IPW
PRE
AMP
R8V R8V
FI202:FL-450
FI203:FL-451
2N D IF XTAL
BPF
MIX AM P BP F
Q202:
3SK293
Q 203:KTC4080 21.7MHz FI201:
HDF160F
MAIN 1st LO Frequency range
2ND LO R3V
MAIN-RX:134.350-141.575MHz
BUFF
(M424 and [AUS])
134.300-141.725MHz
(Except [CHN] and [AUS])
134.350-140.325MHz
([CHN])
R8V R8V
FI302:FL-452
FI303:FL-453
IF XTAL
2N D
BPF
AMP BPF
MI X
Q302:
3SK293
Q 303:KTC408 0 30.875MHz
R3V
CH70-Lo Frequency
2ND LO
CH70-RX:125.650MHz
BUFF 30.425MHz
(#ALL)
MAIN 1st LO Frequency range
X302
TX :156.025-157.425MHz
CR-922
(M424,[CHN] and [AUS])
156.000-161.450MHz
R8V R8V
(Except [CHN] and [AUS])
D7,D8: Q13:
LO HVD144A 2SC4226
X3 BPF
AM P
TX/RX YGR
SW AMP
Q401:3SK294 Q402:3SK293
3V
Q7:KTC4080
T5V T5V
BUFF BUFF
Q6:KTC4080
VCO UNIT
Q 3,Q4:2SC4226
D 3:HVB350BYP Q5:KTC408 0
VCC 5V
VCO Q10:KTA2015
BUFF
Q11:LDTC144EE
+5 T5
REG CTRL
5V IC512:
INV RVSO KIA7805API
Q23:KTA2015
3V Q 12,Q24:LDTC144EE
Q 9:LDTC144EE
+3 R3
REG CTRL
IC903: IC511:NJM7772F33
NJM2847F3-011
+1.1V 3V
REG Q511:LDTC144EE
Q512:TPC611 1
HV PWR VCC
CTRL
REVERSE
CONNECT
PROTECT
D601:DSA3A1
IC506A: IC502D:
LMV324IPW CD4066BPWR
3V
AF
SAFO
BUFF
MUT E
GATE
CTRL
IC502C:
CD4066BPWR Q504: ADJMIC
LDTA144E E SW
AF
MUT E Q505
LDTC144EE
IC703:TC7S66FU IC701B:LA4625
AF AF
MUTE AMP
R8V
D 19:HVD144A
(#01,02,10,20)
RF ATT
BPF ATT
AMP
Q201:3SK294 D18:HSM88ASR
ANT
D 14,D16:
RN752
ANT
LPF
SW
IC1:
RA33H1516M1
PWR
LPF
AMP
D 12,D13:
HV HSM88ASR
RF OUT TDETV
DET
D11:HSU88
I C2:NJM2730F Q15:LDTC114EE
T5V APC PWR HL
CTRL CTRL
T5
TX MUTE TXMSO
CTRL
R3V
Q14:LDTC114EE
R8 R8V
REG
Q21:KTA1664
Q22:KTC4075
VCC
OPTIONAL COMMANDMIC
EXTMI C
REG
Q501:2SB1143
Q502:KTC811U
PTTC
ICF3
PA SP (BTL AMP)
EXT SP(BTL AMP)
NMEAI+
NMEAI-
NMEAO
GND