Icom IC-M504 Service Manual page 30

SECTION 10 BLOCK DIAGRAM
VR BOARD
VOL1
R1
VOL2
Q65:
KTC2875 IC9:LA4425A
AF AF
MUTE AMP
SQL BOARD
S5V
R1
SQLV
DIAL BOARD
S1
1 2 D1
ICAB:LM2904PWR
1 2 3 D2
C
4 4 D4
8 5 D8 BPFV
BUFF
IC2B:LM2904PWR
DS1: IC10:
HLM7784-010100 TC74LCXR164245
DSCENC
BUFF
LCD
BUFF
MODULE
X1:CR-790A
9.8304MHz
IC11:S-817B33AMC
3.3V
L5V
REG
KEY
BOARD
IC3:
HN58X2464TI
Q1:2SB1201 IC1:M30622MEP
Q2,Q3:KTC4075x2
EEPROM
CPU
VCC
DIM
CTRL
DS2-10:
IC4:
SML311Yx9
S-80942CNMC
DS11-22:
FY1101Fx12
RESET
IC8:TA78L05F
L5V L5V
REG
BUFF
Q4:KTC2875
D1,D5:KDS122
IC9B:KIC7W14FK
Q9:2SK1069
ICF3
CI-V
I/F
BUFF
IC9A:KIC7W14FK
Q7:2SC4081
Q8:2SA1576
IC6:PC357N6
IC9C:KIC7W14FK
D2:KDS4148U
PHOTO
BUFF
COUPLER
LOGIC BOARD
BUFF
Q5:2SC4081
Q6:KRC404
HM-126
D3:KDS122
D4:MA8062
PTT
HANG
KEYM
MIC
SP1
INT SP
FRONT UNIT
IC11:NJM2211M Q38:KTC4075
SPMUTE
DSDM DSC
LPF
DECODER
WXDEC
SQL
IC15:NJM2211M IC12B:LM2904PWR IC12A:LM2904PWR
DSD70 DSC
HPF LPF
DECODER
IC3D:
Q31,32:
IC26:
CD4066BPWR
KTC4075
KIC7W53FK
AF
BPF
MUTE
IC4C:
CD4066BPWR
H/L
SCON RMUTEM
RMUTES
OPTION DETO
AF
MUTE
IC3C:
CD4066BPWR
SCRMBLER
IC5A:
SCUSE
UNIT CD4066BPWR
INCOM AF
MUTE
MICO
AF
MUTE
MMUTEM
IC3B:
MMUTES
CD4066BPWR
INCOM AF
MUTE
IC5B:
CD4066BPWR
HV
IC8B:
NJM4558M
MIC
IDC
MUTE
IC3A:
CD4066BPWR
IC5D:
IC7A:
CD4066BPWR
NJM4558M
AF MIC
MUTE
AMP
NMEAI+ IC7B:
NJM4558M
PTTM
NMEAI-
MIC
IC6B:
AMP
CD4066BPWR
NMEAO AF
PTTS
MUTE
VCC
S5V
IC27: IC28:
CD4094BPWR CD4094BPWR
EXPANDER EXPANDER
AF UNIT
10 - 1
FI3:LT450EW
X2:JTB450C24
DETM CERAMIC
450kHz
BPF
2ND
FM 2ND IF
MIX
DET AMP
2ND LO
NOISE NOISE
AMP BUFF
DET
R214
IC2:TA31136FN
SQL
DET70 FI6:LT450EW
X4:JTB450C24
CERAMIC
450kHz
BPF
AF FILRMM
FM 2ND IF 2N D
MUTE DET AMP MIX
NOISE 2ND LO
NOISE
AMP DET
BUFF
AF FILRMS
MUTE IC14:TA31136FN
IC4B: Q64:KTC4080
CD4066BPWR
X2
Q72:PMBFJ310
D51,D52:HVC358Bx2
VOLO
X1:CR-827
LOOP
RX VCO
15.3MHz
FIL
Q75:KTC4080
BUFF
FILOS
IC1:UPD3140GS
PLL Q3:KTC4080
BUFF
Q4,Q5:2SC4226x2
D3:HVC350B Q6:KTC4080
TX/
LOOP
CH70-RX BUFF
IC8A: FIL
VCO
NJM4558M
LPF
MOD R10V
SHIFT
R327
Q2:KRC404
D1,D2:MA77x2
FILOS
FILO
FOG
INCOM INCOM
IC4A:
CD4066BPWR
MICAFO
MICAF
SMIC
AF
AF
MUTE MUTE
IC5C: IC4D:
CD4066BPWR CD4066BPWR
MAIN UNIT
BPFV
FI1:FL-368
FI2:FL-399
D32:HSB88WS
IF XTAL IF
BPF
AMP BPF AMP
Q24:KTC3880S 21.7MHz Q22,23: D26-D31:
PMBFJ310 KDV214Ex6
Normal channels
R10V
X3:CR-804
21.25MHz
DSC channel (CH70)
FI4:FL-372
D39:HSB88WS
IF IF
XTAL
BPF
AMP
AMP BPF
Q63:KTC3880S 31.05MHz Q58,59:
PMBFJ310
R10V Q76:KTC3080
D7,D8: Q10:
MA77x2 2SC4226
BUFF
TX/RX YGR
SW AMP
Q7:KTC4080
BUFF
Q52:KRC404
Q57:KTA2015
Q71:KTC4075
S5V T5V T5V
CTRL
RVCO10V RIPPLE
BUFF
FIL
Q74:KTC4080
SEND
Q1:KTC4075
HV
VCO5V RIPPLE S5V
FIL
RCV R10V
R10V
REG
HV
Q54:KTC4075
Q55:2SB1201
VCC
Q61:TPC6104
Q62:KRC404
HV PWR VCC
S5V
CTRL
REG
IC10:
REVERSE
KIA7805API
CONNECT
PROTECT
IC29:
D42:DSA3A1
NJM2107F
FILOS
BUFF
Q37:KRA304
AF FOGO
GATE
MUTE
CTRL
Q66:
KRA304
IC6C:
CD4066BPWR
AF
MUTE
HAILO MICAF MICAFO AF
MUTE
EL
VOL
FILRMH HAVOL HAVOLO AF
IC13: AMP
M62429FP
IC14:LA4485
RX
TX
Q21:3SK292
COMMON
RF
AMP
DATA
VOLTAGE LINE
D22:MA77
ATT
POWER
ATT
DIVIDER
ANT
Q61:3SK292
D14,D21:
L308CCBx2
RF
AMP
ANT
LPF
SW
IC3: D12,D13:
S-AV35(I)
HSM88ASRx2
TXDET
PWR RF OUT
LPF
AMP DET
HV
R112
APC PWR H/L
CTRL CTRL
Q14:KTA2015 Q17:KRC402
Q15:FMW1
TMUTE
TX MUTE
CTRL
Q16:KRC404
OPTION
COMMANDMIC-3
IC6D:
CD4066BPWR VCC
SAFO AF
MUTE
AF/MIC
PTTC
ICF3
HAIL
EXT SP
EXT SP
NMEAI+
NMEAI-
NMEAO