Block Diagram - Icom IC-756PROIII Service Manual

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
40MHz DPGI 5VA
IC2001 IC2051
ADSP-21061LKS-160 TC74VHC125FT
LEVEL
A/D
CONV
IC2321
CS5396-KS
TIMING
DSP
IC2053
TC74HC02AF
IC2054 IC2341
TC74VHC74FT TC74VHC00FT
IC2343
TC7WH74FU
LEVEL
TIMING
CONV
IC2072 IC2052
IC2351
TC74VHC541FT TC7SET08FU
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
IC2062 DIV
TC74VHC541FT
DSIR
IC2342
DCWK
LEVEL
TC74VHC4040FT
CONV DSFR
DSDW
D/A
IC2101
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
AMP
MISL
AFO AF
ATT
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
DIFF
IC2201X
CONV BU4053BCFV
LPF AMP
R2229
IC2201Y
AM MOD LEVEL IC2211B IC2211A
BU4053BCFV
M5218AFP M5218AFP
CALS
MODS
ACKS
LIMIT
LPF
AMP
AMS R2227
FM MOD LEVEL
AF
AMP
IC2371B
IC2401
µPC4570G2 IC2372Z
MAX293CWE
BU4053BCFV
IC2441A
LPF NJM2058M
IC2372Y
HPF
BU4053BCFV
IC2473
TC4W53FU
AMP
IC2372X
IC2371A
BU4053BCFV
µPC4570G2 IC2381C,D IC2381B
µPC4574G2
µPC4574G2
IF
LPF
AMP
(491.52kHz)
IC2381A
IC2302 µPC4574G2
IC2472A,B
TC4W53FU
M5218AFP
(36kHz)
BUFF
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
MSL1
Q471
MSL2
2SC4081
IC3003 M5282FP
IC3002Z IC3005Z
BU4053BCFV
BU4053BCFV
AMPO
AF
VCA
AMP
MEMORY BOARD
VOGV
MISL
VCA MOSL MOSL
IC362
ROM
TC4W53FU
IC3004B
IC1 IC2
BUFF
NJM4558M
AF SC-1415-1 ID171256SA15PZ
AMP
AVXL
MOSL
VOXL
TUNER MONITOR NB NR
KIO
TUNER LED MONITOR LED NB LED NR LED
TNRD MOND NBD NRD
AF
AFL
RF/SQL
RFL
BAL
IC102C,D
BALL
MC14071BFEL NR
NRL
MIC GAIN
MIGL
WAVE
RF POWER
FORMER PWRL
CNTV
COMP
CMPL
KEY SPEED
KYSL
BK-IN DELAY
DELL
MAIN DIAL
BKLV
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
(36kHz) DRIF
IF CERAMIC
LPF
AMP BPF
(BW-15kHz)
IC2201Z
RX TOTAL GAIN
BU4053BCFV
DTAF
IC153 IC152
TC4SU69F TC4SU69F
LO LO
AMP AMP
MODS
NBLV
Q241
IC221 2SK882
NJM1496V
36kHz 455kHz
IF
AMP
AF
AMP
DRIV
IC2471A
M5218AFP DTIF
Q521
2SA1576
ALC
EALC
AMP
LPF
IC551D
NJM2058M
ICH
ALC
ICL AMP
FORV
REFV
IC551C
NJM2058M
Q501
DRAF
PHFS
UMH11N
ALC
Q502
AMP
P5OS UMH4N
PWR
AMS
CTRL
+14V
ALC
POCV
AMP
IC3004A
IC551B
NJM4558M
NJM2058M
IC3005X
BU4053BCFV
AMP
BUFF
DTAF
MOSL
IC3005Y
IC3001
BU4053BCFV 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
RAM VRAM RESET
CONT DRIVER CPU
X3501
X3551
HV
CSTCV26.00MXJ040 CR-520
26MHz 19.6608MHz
IC841 NJM2360M
Q841 2SB1124
BACK
LCD D841 RB050L-40
LIGHT
-15V
14V -15V
DC-DC
-15V
+18V
IC501 TA79L08F
D501 1SS322
Q1201,Q1211
Q1221 × 3
IC1401
-7V
2SA1576 M52338FP -7V
REG
RGB
IC881 TA79L08F
CTRL
-8V
LCD
IC1521B
REG
INTERFACE
M5218AFP
IC861 TA7805F
CONT
CTRL
+5V
5V
REG
Q801 2SC4081 Q803,Q804
IC821 BA6161F
2SC3647 × 2
Q802 2SC1201
Q821 2SC4081
D822 RD20M
BKLV DC/AC
CTRL INVERT
+18V
DC-DC
Q141 D113,D114
1SV308 × 2
3SK131 R8V
NB
IF
AMP GATE
Q274
2SC4081
AGC
Q276 Q275 455kHz
AGC
2SA1576
2SC4081 AMP
Q278
UNR911HJ
Q279 Q273 Q272 Q271
D273
D271
2SC4081 2SK882 2SK882 2SK882
MA2S111
1SS375
T8V
GATE NB
IF IF IF
BUFF
CTRL DET AMP AMP AMP
UNLC Q261
FI131
2SK882
CFWM455D
IF
BPF
AMP
MODS
FI133
ALC
CFWS455IT
BPF
IC101B
NJM4558M
ALC BANV AMP BANS
IC551A
NJM2058M
IC805
AMP ALCL
AN79L05M
Q621
2SA1577
IC571A -5V
-8V -5V Q622
REG
NJM4558M
UMH11N
IC801
AMP FORL TRVI
PAT8
BA033T
REG
3.3V
3R3V
IC571B
REG
NJM4558M
IC802 Q611
2SD1619
AMP REFL TA7805F
Q612
2SC4081
+5V
M5V
D611
REG
DA221
TXS
T8
14V REG
D801
MA8051 Q601
IC803 Q804 2SD1619
TA7805F 2SD1801 Q602
2SC4081
+5V RIPPLE D601
D5VA
REG FIL DA221
RXS R8
REG
8V
IC3503 IC3751 IC3752,IC3753 IC3653,IC3654 IC3652
CAT25C32SI M62352GP BU4094BCFV TC74AC574FT TC74AC245FT
SERI BUS
RTC EEPROM D/A
PARA DRIVER
BT3501
BACK UP
CR2032
-8V
Q3504 2SA1576
D3504 MA2S111
+18V
D3505 MA2S111
D3506 MA2S111
X401
CR-567
3.8304MHz
SUB
CPU
IC401
HD6433832SD66H
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
D1852 HSB88WS
T8V
ATT ATT C
R8V
T8V
LO
AMP
Q1801
2SK882
ATT
2LO
64.00000MHz
PAT8
Q2101
2SK882
LO
D
AMP
E
T8V
F
R8V
S2LO
77.8MHz
Q904
2SC2714
LPF AMP
BUS G
DRIVER
3LO
491kHz
H
Explanatory notes
VOLTAGE LINE
TX LINE
RX LINE
COMMON LINE
PLL UNIT