Block Diagram; Main Unit - Icom IC-703 Service Manual

SECTION 9

BLOCK DIAGRAM

FI1501 D901
CFWS455E HSB88WS 3dB
D1401 30dB D1403
D863
CERAMIC
ATT
BPF
BW=15K
Q1401 2nd Lo
3SK294
Q881
IF
3SK294
AMP
D864
IF
AMP
D1402 D1404
ATT AGC
3dB
IC1401
TC4W53F
ALCL
AGC
Q1402: DTC114EE
Q1003: 2SC4081 Q9681
T8V
Q1002: 2SC4081 2SC4081
GATE 2nd VCO
LPF
CTRL REG
NBLV Q1051
Q1052 Q1053
2SK882 2SK882 2SK882
NB
AMP AMP AMP
DET Q9621: 2SK210
D9621: MA357
D1002 RB876W
LOOP
AMP
Q1004: 2SA1576 FIL
Q1005: 2SC4081
AGC Q9651 D9622
AMP 2SC4673
MA357
NB
NBS
SW
Q1001: DTA114EE
Q1006: 2SK3018
Q9801: XP4311
IC2651
D9801: DAP222
TC4W53F
FMOD
UNLK
FMS RXS
Q1101 Q1201
3SK294 2SK882
D1317 D1309 D1301
AMP
AMP
R8V AGC
2FTH
FI1301
FL-65(K5)
D1311 D1303
CERAMIC
BPF
BW=2.3K
2F23
FI1341
CFWS455G
IC2101
D1313 D1305
CERAMIC TA31136FN
BPF
FM
BW=8K DET
2F80
D1315 D1307
XTAL
BPF
OPTION
2FOP
IC1801
IC1751
TA4107F
TC4W53F
D1302
SSB
MOD
T8V MINH AMS
IC1621
NJM2902M
AMP
IC1601
Q1721
IC1602
M5282FP
2SC4081
TC4W53F
VCA
IC1621 BUFF
NJM2902M
COMP COMS
FRONT
MIGV ETON
&
MAIN COMV
COMI
UNIT
IC1621
NJM2902M
AMOD
AMP VOXL
DIN
IC7001
NJM2902M
AMP AVXL
IC1701
BU4052BCF IC2201
NJM2058M
AMP
Q831
3SK294 D701 60MHz
D804 D802 HSB88WS
D861 D602 D601
XTAL IF
LPF
BPF AMP
FI851 20dB
FL-348
ALCL TXH TXL
1st Lo
D862
IF
AMP
D622
D803 D801
Q811
D623
2SK508 PRE
AMP
Q651
2SC4536
P5V
D632
ATT ATT
IC9681
TA78L05F
2nd PLL
8V
REG Q9221 Q751
2SC4081
2SC4673
LO
LPF ATT
1st VCO AMP
P8V
REG
3dB
IC9601
IC9001 Q9051
LC7153M AD9833BRM
2SC4081
PLL
DDS BPF HPF
BUFF
IC
Q9201: 2SK508
D9201: KV1770S
HFS
Q9301
2SC4406
ULP
PLL LOOP
LPF AMP LPF
IC FIL
IC9101
MC145170D2R2
50MS 50MS
Q9251: 2SK508 [EUR], [USA]
D9251: KV1770S
[KOR] only
SW
X9501
LPF LPF
AMP
CR-745
16.384MHz
IC9521
TC7SU04F
BFO
DSS LPF
IC9701
AD9833BRM
RFGV
AGFS
AFMS AGC
D2501
Q1251 Q2501 IC2401
RB876W
2SC4081 2SC4081 NJM2902M
AGC AGC METER
BUFF
AGC CONT SML
DET AMP AMP
Q2502/Q2503: DTA114EE
Q2504/Q2505: 2SK3018
IC1901
TA4101F
SSB
DET
D2001 IC2301 IC2401
IC2461
RB876W BU4052BCF NJM2902M
TC4W53F
AM
MODE
AMP
DET
SEL
AFS1 DSPS
IC2401
NJM2902M
NSQL
AFS2
HPF
DSP
UT-106
IC7001 [Equipped version] only
NJM2902M
R7205
OPTION
VOICE
CTCSS CTCL
SYNTHE
UT-102
250Hz
H3V
3V
Q9964: DTA114EE
Q9966: 2SK3018
P5V SW
TONE PSS
5V
IDC
Q9963: DTA114EE
Q9965: 2SK3018
IC2201
NJM2058M
P8V SW
R2618 R2621
IC9961
BA08FP
AM DEPTH FM MAX DEV
PSS
+8
8V
REG
Q6342: 2SB1132
Q6343: 2SK3018
T8V SW
TXS
D96S
MODS
Q6322: 2SB1132
Q6323: 2SK3018
SW
R8L
D2221 Q6201
IC2201
RXS
1SS385 DTC114EE
NJM2058M
DET AMP SW UNLK
9 - 1
IC101 Q101
PC2709T 2SK3074
0.1-2MHz
D542 D541 D102
30-40MHz
YGR PRE
LPF DRIVE
AMP
20dB
fc=60MHz
BTHH
T8L
D552 D551
HPF
D621
ATT LPF
3.5MHz
B2H
D562 D561
HPF
D631
7MHz
B3H
D303
D572 D571 D301
HPF LPF ATT
10/14MHz fc=1.6MHz 10dB
B4H
D305
B0H
D582 D581 D302
HPF HPF
D101
18/21MHz fc=1.6MHz
B5H /B0H
D592 D591
HPF
24/28MHz
B6H
D522 D521
HPF LPF
40-60MHz TX
B7TH
IC2701
NJM2902M
Q501
2SK1740
D502 D501
PRE
LPF HPF
AMP
IC2701
NJM2902M
IC2701
40-60MHz RX NJM2902M
ALC
B7RH ALCL
AMP
[EUR], [USA],[KOR] only IC2701
NJM2902M
Q7371
ECH8301
J7372 P1 SP1
1 1
2 2
SPS CHASSIS UNIT
IC7201 IC7301
M5282FP TDA7233D
AF
VCA DISPLAY BOARD
AMP
AFO
(FRONT PHONE) IC5: S-812C50AUA-C3E
AFGV
Q10: 2SC4081
Q11: 2SB1143
D9 : MA2S111
+5
8V
REG
BUFF BEEP
IC7001
NJM2902M
RESET
MAIN DIAL
IC4
IC9901
S-80945CLMC-G7F
S-812C33AMC-C2N-T2
+3
HV
REG
EX-2500
IC9921
BA033FP
+3 IC3
14V
REG TC7W32FU
WAVE
RIT
FORM
IC9941
TA7805F
SHIFT
+5
REG
AF
Q9967: DTA114EE
Q9968: ECH8301
CONT
RF/SQL
PWRS
VR BOARD
FRONT UNIT

MAIN UNIT

Q150 Q200/Q201
RD01MUS1 RD07MVS1 RL250
RL400 RL401
DRIVE PWR
LPF
AMP AMP
15dB 15dB 10dB
0.03-2.0MHz
T8
PWRS
RL420 RL421
LPF
2.0-4.0MHz
LPF
RL440 RL441
LPF
4.0-8.0MHz
F3
ATON
RL460 RL461
LPF
D2
ATT
8.0-15.0MHz
F4
20dB
D1 RL480 RL481
LPF
15.0-22.0MHz
F5
ATOF
RL500 RL501
LPF
22.0-30.0MHz
F6
RL520 RL521
LPF
30.0-60.0MHz
F7
HV
FORL
ALC
AMP
Q80: 2SK3018
POCV
Q81: ECH8301
14V
POWS
APC
REFL
AMP
Q900: ECH8301
Q902: 2SK3018
DC-INPUT
for AH-4
IDH
APC
AMP
IDL POWS
S14
PWK
POWER
X1
5V IC6
CR-567
HD6433842RB27H
(9.8304MHZ) IC5401
TC74HCT7007AF
SUB LEVEL
CPU CONV
KEY
Q13: 2SB1132
Q14: 2SC4081
KEY
KEY
EEPROM
LED
DIMMER
IC5961
CAT24WC64J
Q2: 2SB1132 DS5
Q3: 2SC4081 CV1073
BACK
BACK CI-V
CIV
LIGHT
LIGHT I/F
DIMMER
Q4001 : 2SA1576
Q4002 : 2SC4081
IC2 IC4001: TC7W04F
SED1522FOC
PHONE LCD
START
DET DRIVER TUNER
I/F
KEY
Q18: XP4111
for AH-4 IC5701: TC7S04F
Q15: DTA114EE
Q5701 : 2SK3018
Q12: XP4111
SW LED
DS4
LCD
CONT IC5851
DLC-8309YBGF
SN74HCT244APW
D96S
COMS
LEVEL
AFS1
CONV
AFS2
AMS
MINH
SW LED Q50: 2SB1132
MODS
SW LED
DIMMER Q51: 2SC4081
DSPS
CHASSIS UNIT
D560/D561 RL640 RL641
MA732
PWR/SWR TUNE
DET NET
F1 TDTS
IC560
NJM2904M
FORL
BUFF
D645
F2
RB876W
IC560
NJM2904M
SWR
BUFF REFL ATT
DET
10dB
TSWL
D646
Q641
IC641: TC4W53F RB876W
2SK882
Q646: 2SK3018
IMP
AMP
DET
TPZL
SW
TPZS
Q643: 2SK882
D643
HSB8BWS Q811: 2SC4405
PHASE
AMP
DET
COMPA
TPHK
RATOR
D640
RB876W
IC640
TA75393F
POWER
DET
IC600
ISPLSI2064VE
-100LT100
EXPAND
PA UNIT
IC5601
BU4052BCF
REFL
BEEP TSWL
5ML
NSQL
FORL
A/D ALCL
TPZL
MAIN X5901
CR-567
CPU
(9.8304MHz)
RESET HV
IC5901
M30620MCM-1W4GP
IC5981
R3112N281A
B0H
IC6101
BTHH
BU4094BCF
B2H
B3H
EXPAND DRIVER B4H
B5H
B6H
B7RH
Q401-Q407
B7TH
2SC4081
Q408-Q409
2SC4081 [EUR],[USA],[KOR]
IC6501
M62364FP
COMI
NBLV
COMV
IC2401
D/A DRIV
NJM2902M
MIGV
BANV
AMP BAND
RFGV
AFGV
POCV
IC9801
TC74HCT7007AF
PDT5
LEVEL
PCK5
CONV
PST5
BST5
SST5
DST5
NOTE:
TX LINE
RX LINE
COMMON LINE
etc.N-DATA
SIGNAL LINE
DATA BUS LINE
etc.DATA
ANTENNA