Icom IC-M422 Service Manual page 29

SECTION 10 BLOCK DIAGRAM
HM-150B/SW
MIC
MIC
PTT
KEYM
FRONT UNIT
SP1
INT SP
VR BOARD
VOL1
R1
VOL2
PWR
SQL BOARD
5V
R1
SQLV
IC5B:
LOGIC BOARD
NJM2904M
BPFV
BUFF
IC5A:
DS1: IS08328E
NJM2904M
DSCENC
LCD BUFF
Q4: KRC414
D1: KDS122
CLONE CI-V
I/F
Q1: KTA1664
Q2, Q3: KTC4075
CPU
IC1: M30222MA
DIM
CTRL
BUFF
IC7B: TC7W14FU
Q9: 2SK1069
CPU5V
BUFF
IC3: AN78L05M
IC7A: TC7W14FU
Q7: 2SC4081
Q8: 2SA1576
Explanatory notes IC7C: IC6: PC357N6T
TC7W14FU D2: 1SS355
VOLTAGE LINE
PHOTO
BUFF
TX LINE COUPLER
RX LINE
Q5: 2SC4081
Q6: KRC404
COMMON LINE
D3: KDS122
D5: 1SS355
DATA
BUFF
PTT
KEYM
WXDEC
IC15: NJM2211M
IC9: LA4425A
BEEP DSDEC DSC
AF
AMP DECODER
IC11: NJM2125F
SQL SQL
AMP
IC4C:
BU4066BCFV
FILO
AF
MUTE
RMUTEM
RMUTES
IC5A:
BU4066BCFV
AF
INCCM INCOM
MUTE
MMUTEM
MMUTES
KEY
BOARD
X1: CR-739
9.8304 MHz
IC2: IC5D: IC7B:
S-80942CNMC BU4066BCFV NJM4558M
AF MIC
RESET
MUTE AMP
EEPROM
IC4:
HN58X2464TI
IC6B:
BU4066BCFV
HV AF
CPU
MUTE
5V
VCC
NMEAI +
NMEAI –
NMEAO
10 - 1
FI3: ALFY450E
CERAMIC
BPF
IC2: TA31136FNG
Q38: KTC4075
FM 2ND IF 2ND
LPF
DET AMP MIX
Q31, Q32:
KTC4075
NOISE NOISE 2ND LO
AMP DET BUFF
R214
BPF
X1: CR-804A
21.25 MHz
IC4B:
BU4066BCFV 2nd LO
AF FILOS
MUTE
PLL
IC1: µPD3140GS
Q4, Q5: 2SC4226
D3, D4: HVC350B
LOOP
VCO
FIL
IC5B:
BU4066BCFV
AF
INCMC
MUTE MOD
SHIFT
R327
Q2: KRC404
D1, D2: MA77
HV
IC7A: IC8B:
NJM4558M NJM4558M
RMUTEP
IDC LPF
FILO
DSENC MMUTEP
IC8A:
NJM4558M
MIC INCOM
AMP
MAIN UNIT
BPFV
FI1: FL-368
FI2: FL-363
Q23: KTC3880S 21.7 MHz
Q22: 3SK131
IF XTAL RF
BPF
AMP BPF AMP
Q21: 3SK131
D26, D27, D28:
KDV214E
R5
D7, D8: Q10: Q12:
MA77 2SC4226 2SC3775
TX/RX PRE YGR
DRIVE
SW AMP
Q3: 2SC4215 Q7: SC4215
BUFF BUFF
Q6: 2SC4215
IC10: Q52: KRC404
BUFF KIA7805API Q57: KTA2015
S5V T5
+5
CTRL
REG
R5
Q53: KTA2015
HV Q54: KRC404
R5
D61: TPC6104
CTRL
D62: KRC404
VCC
PWR
CTRL
REVERSE
CONNECT
PROTECT
D42: DSA3A1
Q36:
2SK1069
FILOS
BUFF
IC4D:
BU4066BCFV
Q37: DTC144EU
AF
MUTE
GATE
CTRL
IC5C: IC13: Q65:
BU4066BCFV M62429FP 2SC4213
PAOUT
AF EL AF
MUTE VOL MUTE
AF
MUTE
D14, D21:
D22: 1SS307 XB15A308
ANT
BPF ATT LPF
SW
D25: KDV214E
IC3:
RA35H1516M
PWR
LPF
AMP
HV
TXDET
D12, 13:
RF OUT
HSM88ASR
DET
Q17: KRC404
IC12: NJM2107F D11: MA2S111
H/L
APC PWR
CTRL CTRL
T5V D10: MA2S111
TMUTE
TX MUTE
CTRL
R112
R5V
R8V
R8
REG
Q55: KTA1664
Q56: KTC4075
IC6D:
BU4066BCFV
OPTION
SAFO
AF
MUTE
COMMAND MIC-2
PTTC
HV
IC6C:
BU4066BCFV AF/MIC
ICF3
IC14: LA4425A
AF
PA SP
AMP
EXT SP
EXT SP
NMEAI +
NMEAI –
NMEAO
ANT