![background image](http://html.mh-extra.com/html/icom/ic-7800/ic-7800_service-manual_612345180.webp)
9 - 1
SECTION 9
BLOCK DIAGRAMS
Explanatory notes
TX LINE
VOLTAGE LINE
RX LINE
COMMON LINE
LINE
DATA BUS
REVERSE
PO_DET
Q401 2SC4116
D402 MA742
RL401
RL_CTRL
Q402 2SC4081
Q403 DTA114E
Q404 DTC144E
SPLITTER
ATT
3dB
ATT
6dB
ATT
12dB
RL351
RL21
BPF
D_SEL
RF
AMP
2SC5551
Q201
RL2
BPF
2-3MHz
BPF
4-6MHz
BPF
11-15MHz
BPF
22-30MHz
BPF
1.6-2MHz
ATT
3dB
ATT
6dB
ATT
12dB
RL371
RL355
RL381
BPF
50-54MHz
LPF
-1.6MHz
BPF
3-4MHz
BPF
6-8MHz
BPF
8-11MHz
BPF
15-22MHz
D_S_CTRL
BU2099
IC4/IC5
RL851
RL253
IC401
RL_CTRL
TD62783
RL252
L-NET
C-NET
ANT3
1
2
RL251
ANT1
1
2
ANT4
1
2
D301/D302
HSM88AS
C-NET
ANT2
1
2
AMP
IC301
NJM2903
IC1
M38022
TUNER_
CPU
SWR-DET
D101/D102
HSM88AS
R-DET
D201/D202
HSM88AS
P-DET
D151/D152
HSM88AS
LPF
LPF
LPF
LPF
LPF
LPF
LPF
LPF
LPF
RF
AMP
Q101
PD01MUS1
ID_DET
PWR
AMP
Q401
Q402
SD2931
DRIVE
PRE
Q201
PD55003
FUN
CTRL
IC821 NJM2904
Q821 2SB1201
Q822 2SC4081
ATT
MF1
DRIVE
AMP
Q301
SD2918
HSB88WS
D506
BPF
BPF
BPF
BPF
YGR
AMP
2SC5551
Q801
LPF
LO
AMP
Q507
2SC4673
BPF
BPF
BPF
BPF
FL-348
FI503
BPF
RF
AMP
2SC5501
Q508
ATT
IF
AMP
2SK882
Q506
BPF
BPF
HSB88WS
D505
ATT
IF
AMP
2SK882
Q504
BPF
CERAMIC
FI501
CFWS455D
BPF
CERAMIC
FI502
CFWS455IT
IF
AMP
3SK294
Q501
TA4107
IC503
LPF
NJM5534
IC501/IC502
ATT
MF3
P.AMP1
2SC5551
Q1007/Q1008
LO
AMP
Q1101
2SC3950
RL1005
P.AMP_SEL
µ
PG2009
IC1081
50/HF_SEL
FIL_SEL
µ
PG2009
IC1402
LPF
NJM074
IC1505
BPF
XTAL
FL-364
15kHz
FI1401
IF
AMP
NJM5534
IC1504
P.AMP_ON
RL1006
RL1004
P.AMP_SEL
IF
AMP
NJM5534
IC1506
BUFF
2SC4835
Q1502
P.AMP2
2SC5551
Q1006
RL1002
CTRL
IC1702
CD74HC4094
P.AMP1
2SC5551
Q1209/Q1210
90deg
RL1001
LPF
BPF
XTAL
FL-358
6kHz
FI1402
MMBFU310
Q1211/Q1212
P.AMP_ON
RL1203
LPF
P.AMP_ON
RL1206
BUFF
2SC4835
Q1501
FIL_SEL
µ
PG2009
IC1403
SD5400
IC1051
9A41
IC1502
IF
AMP
2SC5501
Q1401
DW_AMP
2SC5551
Q1001
LPF
P.AMP_ON
RL1003
LO
AMP
2SC4673
Q1301
IF
AMP
NJM5534
IC1503
IF
AMP
2SC4402
Q1402/Q1403
BUFF
TC74LCX00
IC1651
RL_CTRL
IC1701 CD74HC4094
IC1703 TD62783
9A41
IC1501
NJM074
90deg
IC1505
LPF
LO
AMP
Q1105
2SC5501
LO
AMP
Q1104
2SC3950
BUFF
2SC5551
Q1352
ATT
RL_CTRL
IC55 CD74HC4094
IC57 TD62783
CP5
CP6
CP7
CP8
DC_BUFF
IC2 TA78L08
Q1 2SB1119
Q2 DTC114E
ATT
AGC
DET
D1653 1SS355
IC1652 BA15532
AGC
AMP
NJM072
IC1653
AGC
AMP
NJM072
IC1653
RL_CTRL
BU2099
IC101/IC102
LO
AMP
2SC4215
Q1651
FAN-IDET
IC821
NJM2904
LPF
FILSEL
UMH11N
Q503
Q805 DTC114E
TRV-SW
Q804 UMH11N
E2ROM
CAT24WC256K1.8
IC1
TRVANT
1
2
RF
AMP
µ
PC4094
IC820
AMP
2SC4081
Q806/Q807
Q809
DTC114E
Q808
DTA114E
RL402
BPF
54-60MHz
30-50MHz/
ATT
ATT
RL954
RL_CTRL
IC11
BU2099
LPF
RL953
P.AMP_SEL
RL951
DW_AMP_SEL
RL952
P.AMP_SEL
RL950
DW_AMP_SEL
P.AMP2
2SC5551
Q953
DW_AMP
2SC5551
Q961
ATT
CPU
IC604
HD64F2377VFQ33V
IC250/IC260
CD74HC4094M
SERI/
PARA
BUFF
IC251/IC261
TD62783A
D/A
M62352AGP
IC330
IC402
RL_CTRL
TD62783
IC52 BU4066
IC51 CD74HC4094TD62783
Q51/Q52/Q53 DTC114E
BAND
CTRL
RL_CTRL
IC56 CD74HC4094
IC58 TD62783
Q55 DTC114E
Q3-Q10
DTC114E
MOTOR
CTRL
Q300 2SB1123
Q301 DTC114E
FAN
CTRL
BUFF
Q11-Q14
RN2427
RF
AMP
2SC5551
Q701
BPF
D_SEL
D_S_CTRL
BU2099
IC504/IC505
RL521
RL502
E2ROM
CAT24WC256K1.8
IC501
RL_CTRL
Q381/Q387
DTC144E
BPF
15-22MHz
BPF
1.6-2MHz
BPF
8-11MHz
BPF
50-54MHz
BPF
6-8MHz
BPF
4-6MHz
BPF
3-4MHz
BPF
11-15MHz
BPF
2-3MHz
BPF
22-30MHz
LPF
-1.6MHz
BPF
54-60MHz
30-50MHz/
RL_CTRL
BU2099
IC401/IC402
REVERSE
PO_DET
Q873 2SC4116
D872 MA742
RL_CTRL
Q872 2SC4081
Q871 DTA114E
Q874 DTC144E
RL871
RL855
RL901
DW_AMP_SEL
P.AMP2
2SC5551
Q903
RL902
P.AMP_SEL
RL900
DW_AMP_SEL
DW_AMP
2SC5551
Q901
RL903
P.AMP_SEL
ATT
HPF
CTRL
Q1102 DTC114E
Q1103 2SB1123
CTRL
Q1213 DTC114E
Q1214 2SB1123
HPF
ATT
BUFF
TC74LCX00
IC1651
BUFF
TC74LCX00
IC1651
P.AMP1
2SC5551
Q1209/Q1210
CTRL
IC1702
CD74HC4094
LPF
LO
AMP
2SC4673
Q1301
BUFF
2SC4835
Q1501
LO
AMP
Q1104
2SC3950
BPF
XTAL
FL-358
6kHz
FI1402
9A41
IC1502
ATT
BUFF
TC74LCX00
IC1651
RL1005
P.AMP_SEL
MMBFU310
Q1211/Q1212
NJM074
IC1505
IF
AMP
2SC5501
Q1401
BUFF
2SC4835
Q1502
HPF
LPF
9A41
IC1501
P.AMP_ON
RL1203
CTRL
Q1213 DTC114E
Q1214 2SB1123
P.AMP1
2SC5551
Q1007/Q1008
LO
AMP
2SC4215
Q1651
IF
AMP
NJM5534
IC1504
CTRL
Q1102 DTC114E
Q1103 2SB1123
IF
AMP
NJM5534
IC1503
P.AMP_ON
RL1206
AGC
DET
D1653 1SS355
IC1652 BA15532
BUFF
TC74LCX00
IC1651
AGC
AMP
NJM072
IC1653
BUFF
2SC5551
Q1352
FIL_SEL
µ
PG2009
IC1403
90deg
P.AMP_ON
RL1006
LPF
LPF
IF
AMP
NJM5534
IC1506
P.AMP2
2SC5551
Q1006
LPF
LO
AMP
Q1105
2SC5501
LO
AMP
Q1101
2SC3950
NJM074
90deg
IC1505
SD5400
IC1051
BUFF
TC74LCX00
IC1651
BPF
XTAL
FL-364
15kHz
FI1401
FIL_SEL
µ
PG2009
IC1402
IF
AMP
2SC4402
Q1402/Q1403
AGC
AMP
NJM072
IC1653
HPF
µ
PG2009
IC1081
50/HF_SEL
RL1002
RL1004
P.AMP_SEL
RL1001
DW_AMP
2SC5551
Q1001
P.AMP_ON
RL1003
RL_CTRL
IC1701 CD74HC4094
IC1703 TD62783
ATT
RMUTA
TRV TX
TRVS
DIGISEL UNIT (A)
BPF UNIT
C-NET DATA / BAND DATA
RX-B 1st Lo IN
RX-B (RF PART)
(DSP-B UNIT)
ANT-SW UNIT
TUNER UNIT
FOR/REF(MAIN)
50M
4/5M
18/21M
10M
14M
1.8M
7M
24/28M
3.5M
+48V
IDL
+15V
3dB
PA UNIT
8-11M
1.6-2M
15-21M
4-6M
6-8M
11-15M
2-3M
3-4M
22-30M
50-54M
ALC
3rd Lo IN
491kHz
TX IF IN (TX36K)
MAIN UNIT (TX PART)
(PLL-B UNIT)
RX-B IF OUT
RX-A (RF PART)
RX-A IF OUT
(DSP-A UNIT)
RX-B 2nd Lo IN
(PLL-B UNIT)
2nd Lo IN
(PLL-A UNIT)
1st Lo IN
(PLL-A UNIT)
(DSP-TX UNIT)
(PLL-A UNIT)
64.0MHz
RMUTB
AGC-B IN
(DSP-B BOARD)
SCOPE IF-A OUT
(SCOPE UNIT)
SCOPE IF-B OUT
(SCOPE UNIT)
20k
4k
(DSP-A UNIT)
RX-A AGC DET
(DSP-B BOARD)
RX-B AGC DET
TEMP
DET
THML
CRNT
DET
(PLL-A UNIT)
RX-A 1st Lo
CTRL
(PLL PART)
(PLL PART)
TRC
PAT8
RX-A 2nd Lo
(PLL-A UNIT)
HFDW
HPOFFL
HPR2
HPR1
VH3V
HF3V
1IFN
1IFW
AGC-A IN
(DSP-A UNIT)
B0A-B10WA
HF50A
AT
1
2
A
AT6A
AT3A
BPDAT/BPCKA/BPSTA
TO BPF RL
B0B-B10WB
TO BPF RL
HF50B
AT12B
AT6B
AT3B
DWSPB
VPOFFL
VPR2A
VPR1
VHDWA
FANI
ANT1A
ANT2A
ANT3A
TXB0-B10
137KHz
MODS
TRVSM
IKEY/ISTA/TDRS
TO/FROM CPU
3R5M/4R6M
5M/4R6MOL
FROM CPU
TD
A
T/TCK
LPF1-9
-15V
+15V
+48V
REG UNIT
DSCLA
DSD
AA
TO/FROM CPU
FROM CPU
DSONA
DWSPA
CSTB
FSTB
DRIV
TRV OUT
TX MONITOR (MON)
(DSP-A UNIT)
SW
TX SCOPE OUT
(MAIN UNIT)
NETWORK
BOARD
FILTER UNIT
LOGIC UNIT
MONS
ANT4A
ANT1B
ANT2B
ANT3B
ANT4R
ANT4B
ANT1G
ANT2G
ANT3G
ANT4G
RSELA
RSELB
VPR2B
VHDWB
Marker
(100kHz)
MDAT/MCK/MSTB1/MSTB2
FANV
THML
FAN
CTIN
AN0/AN1
AN3
AN2
TUO
T
TUIN
THRU1
THRU2
THRU1
THRU2
BOARD
FANG
IDH
PA200W BOARD
DDAT/DCK/DSTBA
DSCLA
FROM CPU
DIGISEL UNIT (B)
DSD
AA
DDAT/DCK/DSTBA
DSONA
TO/FROM CPU
TRV
MR8V
(B0A)
(B1A)
(B2A)
(B3A)
(B4A)
(B5A)
(B6A)
(B7A)
(B8A)
(B9A)
(B10A)
(B10WA)
(B5B)
(B4B)
(B3B)
(B9B)
(B6B)
(B7B)
(B10WB)
(B1B)
(B8B)
(B2B)
(B10B)
(B0B)
BPDAT/BPCKA/BPSTB
TRV
HF15V
VH15V
DATA
DATA
MAGCA
DAGCA
R2LO
1IFN
DATA
VPOFFL
1IFW
HPOFFL
DAGCB
MAGCB
HPR2
HF15V
VPR1
R2LO
VH15V
VH3V
HF3V
HFDW
DATA
HPR1