Icom IC-400PRO Service Manual page 31

SECTION 10 BLOCK DIAGRAM
Q18
2SK880
CR-741 LVIN
BUFF
X2
D21 Q19 IC4
MB15A02PFV-1
HVC362 2SC4215
BAL
15.3 MHz
REF PLL LOOP
REF IC FIL
Q34
2SC4116
X3 LPF
F
45.9 MHz
BPF
Q5
DTC144EU
NWC
W/N
SW
SQIN
CDBC450CX24
DET
HPF
D/A
IC16
NJM12902V
IC6
M62363FP-650C DISC
HPF
DISC
TENC
5/2 TONE DEC
IC16
NJM12902V
LPF
CTCSS/DTCS DEC
IC16
NJM12902V
LPF
Explanatory notes
CONTROL LINE
COMMON LINE
J1 TX LINE
REM RX LINE
DATA LINE
SIGO
MCIN
VOLTAGE LINE
BEEPO OPTION
TX LINE
MCOT
RX LINE
AFONO
BUSY COMMON LINE
MMUTE
8V
Q15 XP1214
Q17
RX VCO
2SC4116 Q16 DTC144EU
Q13 2SC4226
D16 HVC350B
RXC
RIPPLE VCO
FIL SW
TXC
Q11 Q10
2SC5107 2SC5107
BUFF BUFF
D18
MA368
FM
MOD Q12
TX VCO
2SC5107
Q14 2SC4226
D17 HVC350B
BUFF
FI1
Q4
FL-335
2SC4215
IF IC
IF XTAL
AMP BPF
IC1 TA31136FN
FI2
X1
CERAMIC
BPF RSSI NOIS
ALFYM450F=K
450 kHz
IC5
IC5
NJM12904V
NJM12904V
AMP LPF
MAIN UNIT
SIG
J6
TXC
ANALOG
MMUT
SW
RMUT
IC14
BU4066BCFV
ACC
SDEC
IC16
NJM12902V
CDEC
RESTO-
RATION
10 - 1
D14 1SV307 Q9 Q8
D15 MA77
2SC5107 2SC3356
YGR
TX/RX
SW AMP
Q1
2SK1829
RSSI
LPF AGC
353.65 MHz-443.65 MHz
D10 D9
HVC350B
Q3 HVC350B
3SK299
46.35 MHz
RF
BPF BPF
AMP
Q2
1st MIXER 3SK293
MCOT MCIN
MIC
E
SIGO SIG
D
Q31
2SJ144
F
IN
LINE
F
SW
AFO
PTT
EPTT
DISC
DET
HORN
HORNO
DIM
DIM
NWC
TMUT
MMUTE
D40
HORNO
DAP222
RXC
MMUT
MMUT
CTRL
RMUTE
D39
DAP222
AFONO
RMUT
RMUT
CTRL
EXP
AFON
AFON
CTRL
IC17
D31
Q27 2SA1577
BU4094BCFV
DAN222
Q28 XP6501
CPU5
5V
+5
8V
REG
D23 DA221
Q25 2SD1664 IC9 IC10
Q29 DTC114TU TA7808F AN78L05M
TMUT
T8V
T8 VCC +8 CPU5
REG 8V REG REG
Q26 2SA1577 Q23 2SJ377
Q30 DTC144EU Q24 DTC144EU
RXC HV
R8V
R8 POWER
REG 8V SW
VCC
PWON
8V
IC3
D2 UM9401F
RA30H4452M-21
D5 UM9401F
DRIVE
PWR ANT
LPF LPF
AMP AMP SW
D43
D4 D8
HVC350B
HVC350B HVC350B
TONE
BPF BPF
TRAP
IC8
IC15
TA75S01F LA4425A
AF
PRE
AMP AMP
AFO
BEEP
AF ON
BEEP0
Q35 DTC363EK
AF
Q36 DTC144EU
MUTE
D29 MA2S111
FRONT UNIT
IC5
NJM12902V
AMP
PTTI
IC5
NJM12902V
TONE SENC0-3
LPF
BEEP
IC5
NJM12902V
TENC CENC0-2
LPF
REM
Q3
DTC144EU
DUSE CPU
FIL
SW
IC1
BUSY
HD64F3687
CPU5
IC2
S-80942CNMC-G9C
RESET
RESET
NOIS EPTT
DIM LVIN
CDEC RSSI
SDEC
BEEP
R59
W2
PTTO
400-430 MHz
440-490 MHz
D1, D11
MA728
DET
LPF LPF
PWR
IC2
D28 MA2S111
TA75S01F
APC MUTE
AMP
SW
J4
SP
DS1-9
J1
SML-311YT
AFO
MIC
PTT
MIC
Q5 Q2
JACK
8V
DTC114TU DTC114TU
LIGT DIM
CTRL CTRL
CLI CLO
IC6 DS11
LC75834W L2-0607TAY
EXOE
LCD
LCS
LCD
DRIVER
LSCK
SEG1-32
LSO
COM1-4
IC3
HN58X2464TI
EEPROM
D4
MA77
CSFT
SHIFT
SW
X1
CR-520
19.6608 MHz
KEY × 6
KS0-1
S2-S7
KR0-2
POSW
POSW
PWR
AFVI
AF VR
R14