Icom IC-756PRO III Service Manual page 82

SECTION 9 BLOCK DIAGRAM
IC2041
TC7SHU04FU
IC2091 S-80934CNMC-G84
IC2042 Q2321 2SJ381
IC2092 TC7S02FU
TC7SH04FU Q2322 2SJ381
X2041
CR-568
CLOCK
VDD VCC
M5V M5V
GENE DET CTRL
DPGI
40MHz 5VA
IC2001 IC2051
ADSP-21061LKS-160 TC74VHC125FT
LEVEL
A/D
CONV
IC2321
CS5396-KS
CALS
TIMING
ACKS
DSP
IC2053
TC74HC02AF
IC2054 IC2341
TC74VHC74FT TC74VHC00FT
IC2343
TC7WH74FU
LEVEL
TIMING
CONV
IC2072 IC2052 IC2351
TC7SET08FU
TC74VHC541FT AD1854JRS
LEVEL IC2071
ROM
CONV SC-1414 D/A
IC2061,IC2063
IC2065,IC2066
CTFL
TC7SET08FU?× 4
RTDT
IC2347
LEVEL
TC74HC390AF
NSQO
CONV
DSDR
DIV
BUFF
X2351
IC2352
CR-643
IC2353
TC7SHU04FU
24.576MHz
TC7SH04FU
DIV
IC2062
TC74VHC541FT
DSIR
IC2342
LEVEL DCWK
TC74VHC4040FT
CONV DSFR
DSDW
IC2101 D/A
DSFW
TC7SH32FU
DSCK
IC2461
LEVEL
BU9480F
DSRS
CONV
Q331
2SD1801
D351
RIPPLE
DAN222 14VA
FILTER
Q351
IC311
UNR9211J
M5282FP
IC331
RL351
TC4W53FU
AHY103
EX-SP PWR AF
MUTE VCA
JACK AMP AMP
IC332
LA4425A
EXT-SP SPS AFGV
AFMS AAFO
IC3771A TC7W04FU
OPTION
IC3771B
Q3771 2SA1576
Q3772 2SC4081
D3771 DAN222 SSTB UT-102 MIGV
CTXD
CI-V
DRIVER
SBSY
CRXD
IC451
µPC5023-077
IC3002X
BU4053BCFV
AF
VCA
AMP
MISL
AFO
AF
ATT BUFF
AMP
PHONE
PHONE
BOARD JACK
PHNI TIMER LED TRANSMIT
TMDI TRAK
POWER
MIC
MICI
MIC PWRK
BOARD
JACK MUD
PB1A
PBT1 PB1B
PBT PBT2 PB2A
NOTCH PB2B
BOARD
PITCH NOTL
PITL
TEN MODE KEY
KEY KEY JACK
TEN-KEY MODE KEY
BOARD BOARD BOARD
DSP-A BOARD
IC2301A
BA15532F
DIFF
IC2291
CONV TC4W53FU
IC2301B
BA15532F
IC2281B
IC2281C,D
NJM2058M NJM2058M
IC2201Z
DIFF
IC2201X
BU4053BCFV
CONV
BU4053BCFV
LPF
AMP
R2229
IC2201Y
AM MOD LEVEL IC2211B IC2211A
BU4053BCFV
M5218AFP
M5218AFP
MODS
LIMIT
LPF
AMP
AMS R2227
FM MOD LEVEL
AF
AMP
IC2371B
IC2401 IC2372Z
µPC4570G2
MAX293CWE
BU4053BCFV
IC2441A
NJM2058M
LPF
AF
IC2372Y AMP
HPF
BU4053BCFV
IC2473
AMP TC4W53FU
IC2471A
M5218AFP
IC2372X
IC2371A
BU4053BCFV
µPC4570G2 IC2381B
IC2381C,D
µPC4574G2 µPC4574G2
IF
LPF
AMP
(491.52kHz)
IC2381A
IC2302
µPC4574G2
IC2472A,B
TC4W53FU
M5218AFP
(36kHz)
BUFF
LPF
DMAF
AF
AMP AGC BUFF LPF
AMP
IC2471B IC2281A IC2441B,C IC2441D
M5218AFP NJM2058M NJM2058M NJM2058M
DMAF
IC372
BEEP
BA3308F
FMTL
STON
ALC
AMP
IC301
TC4W53FU
IC371 MONV
M5282FP
IC361
SQLS
TC4W53FU
AF
VCA
AMP
AMOD BUFF
MSL1
Q471
MSL2
2SC4081
IC3005Y
IC3003 M5282FP BU4053BCFV
IC3002Z
IC3005Z
BU4053BCFV BU4053BCFV
AMPO
AF
VCA
AMP
MEMORY BOARD
VOGV
MISL
MOSL MOSL
IC362
ROM RAM
TC4W53FU
IC3004B
IC1 IC2
NJM4558M
AF SC-1415-1 ID171256SA15PZ
AMP
AVXL
MOSL
VOXL
BACK
LIGHT
TUNER MONITOR NB NR
KIO
TUNER LED MONITOR LED NB LED NR LED
TNRD MOND NBD NRD
Q1201,Q1211
Q1221?× 3
2SA1576
AF
AFL
RGB
RF/SQL
RFL CTRL
BAL
IC102C,D
BALL
MC14071BFEL
NR IC1521B
NRL
MIC GAIN M5218AFP
WAVE MIGL
RF POWER
FORMER PWRL
CONT
COMP CNTV
CTRL
CMPL
KEY SPEED
KYSL
BK-IN DELAY
DELL
Q801 2SC4081
Q802 2SC1201
MAIN DIAL
BKLV
BKLV
CTRL
WAVE
X4
FORMER
RIT DIAL
IC101B,C,D IC101A
RIT
BU4030BF BU4030BF
IC102A IC102B
BOARD
MC14071BFEL MC14071BFEL
9 - 1
MAIN-A UNIT
FI111
R210 IC201B IC201A CFK455E10
IC151
BA15532F BA15532F (455kHz)
TC4W53FU
DRIF
(36kHz) IF CERAMIC
LPF
AMP BPF
Q274
2SC4081
(BW-15kHz)
Q275
RX TOTAL GAIN Q276
2SC4081 2SA1576
Q278
DTAF
UNR911HJ
D273
MA2S111
IC153 IC152
TC4SU69F TC4SU69F
GATE
LO LO CTRL
AMP AMP
MODS
NBLV
Q241 UNLC
IC221
2SK882
NJM1496V
36kHz 455kHz
IF
AMP
MODS
DRIV
DTIF
Q521
2SA1576
ALC
EALC
AMP
IC551D IC551A
NJM2058M NJM2058M
ICH
ALC
AMP ALCL
ICL AMP
FORV
IC571A
NJM4558M
REFV
AMP FORL
IC551C
NJM2058M
DRAF Q501
PHFS
UMH11N
ALC IC571B
Q502
AMP NJM4558M
P5OS UMH4N
AMP REFL
PWR
AMS
CTRL
+14V
ALC
POCV AMP
IC3004A
IC551B
NJM4558M
NJM2058M
IC3005X
BU4053BCFV
AMP
DTAF
MOSL
IC3001
ISD4003-04MS
REC
IC3655 TC74AC08FT
VOSL
IC3656 TC74AC32FT
IC3551 IC3651 IC3501 IC3502 IC3504
S1D13504F00A000 TC74AC244FT
HD64F2375F20 S-80942CNMC-G9C RTC-4553A
IC3553
LH61665AS-60A
LCD BUS MAIN
VRAM RESET RTC
CONT DRIVER CPU
X3501
X3551
HV
BACK UP
CSTCV26.00MXJ040 CR-520
19.6608MHz
26MHz Q3504 2SA1576
D3504 MA2S111
D3505 MA2S111
D3506 MA2S111
IC841 NJM2360M
X401
Q841 2SB1124
CR-567
LCD D841 RB050L-40
3.8304MHz
SUB
-15V
CPU
14V -15V
DC-DC
IC401
-15V
HD6433832SD66H
+18V
IC501 TA79L08F
D501 1SS322
IC1401
-7V
M52338FP
-7V
REG
IC881 TA79L08F
-8V
LCD
REG
INTERFACE
IC861 TA7805F
+5V
5V
REG
Q803,Q804
IC821 BA6161F
2SC3647?× 2
Q821 2SC4081
D822 RD20M
DC/AC
INVERT
+18V
DC-DC
Q141 D113,D114
3SK131 1SV308?× 2 R8V
NB
IF
AMP GATE
AGC
AGC 455kHz
AMP
Q272 Q271
Q279 Q273
D271
2SC4081 2SK882 2SK882 2SK882
1SS375
T8V
NB IF
IF IF
BUFF
DET AMP AMP
AMP
Q261
FI131
2SK882
CFWM455D
IF
BPF
AMP
FI133
ALC
CFWS455IT
BPF
IC101B
NJM4558M
ALC BANV AMP BANS
IC805
AN79L05M
Q621
2SA1577
-5V
-8V -5V
Q622
REG
UMH11N
IC801
TRVI PAT8
PAT8
BA033T
REG
3.3V
3R3V
REG
Q611
IC802
2SD1619
TA7805F
Q612
+5V 2SC4081
M5V
D611
REG
DA221
TXS T8 T8V
14V REG
D801
Q601
MA8051
IC803 Q804 2SD1619
TA7805F 2SD1801 Q602
2SC4081
+5V RIPPLE D601
D5VA
REG FIL DA221
RXS R8V
R8
REG
8V
IC3503 IC3751 IC3752,IC3753 IC3653,IC3654 IC3652
TC74AC574FT
CAT25C32SI M62352GP BU4094BCFV TC74AC245FT
SERI
BUS BUS
EEPROM D/A
PARA DRIVER DRIVER
BT3501
CR2032
-8V
+18V
COMMON LINE
RX LINE
TX LINE
DATA BUS LINE
Q901-Q903 DTC114EE?× 3
Q904 2SC4081
Q905 2SB1201
MDM0
DIMMER
MDM1 LDV
CTRL
MDM2
DISPLAY BOARD
RF-B UNIT
Q1901
XP4311
R8V
DRIVER A
14V
D1752 HSB88WS
64.455MHz
B
ATT
T8V D1852 HSB88WS
ATT ATT C
R8V
T8V
LO
AMP
Q1801
2SK882
ATT
2LO
64.00000MHz
Q2101
2SK882
LO
D
AMP
E
F
S2LO
77.8MHz
Q904
2SC2714
LPF AMP G
3LO
491kHz
H
Explanatory notes
VOLTAGE LINE
TX LINE
RX LINE
COMMON LINE
PLL UNIT