Icom IC-756PROII Service Manual page 95

SECTION 9 BLOCK DIAGRAM
IC2041
TC7SHU04FU
IC2091 S-80934ANMP-DDY IC2301A
IC2042 Q2321 2SJ381
IC2092 TC7S02FU BA15532F
X2041 TC7SH04FU Q2322 2SJ381
CR-568
CLOCK DIFF
M5V VDD M5V VCC IC2291
GENE DET CTRL CONV TC4W53FU
DPGI
40MHz 5VA
IC2001 IC2051 IC2301B
ADSP-21061LKS-160 TC74VHC125FT BA15532F
LEVEL DIFF IC2201X
A/D
CONV CONV BU4053BCFV
IC2321
CS5396-KS IC2201Y R2229
AM MOD LEVEL
BU4053BCFV
CALS MODS
TIMING
ACKS
DSP
IC2053 AMS R2227
FM MOD LEVEL
TC74HC02AF
IC2054 IC2341
AF
TC74VHC74FT TC74VHC00FT
AMP
IC2343
TC7WH74FU
IC2371B
µPC4570G2 IC2401
LEVEL MAX293CWE
TIMING
CONV
LPF
IC2072 IC2052 IC2351
TC7SET08FU
TC74VHC541FT AD1855JRS
IC2372Y
BU4053BCFV
LEVEL IC2071
ROM
CONV SC-1387-1 D/A AMP
IC2372X
IC2061,IC2063 IC2371A
BU4053BCFV
IC2065,IC2066 µPC4570G2 IC2381C,D
CTFL µPC4574G2
TC7SET08FU
RTDT
IC2347
LEVEL NSQO TC74HC390AF
CONV
DSDR
(491.52kHz)
DIV
BUFF
X2351 IC2381A
IC2302 µPC4574G2
CR-643 IC2352
IC2353 TC4W53FU
24.576MHz TC7SHU04FU
TC7SH04FU (36kHz)
DIV BUFF
IC2062
TC74VHC541FT
DSIR
IC2342
LEVEL DCWK
TC74VHC4040FT
CONV
DSFR
DSDW
IC2101 D/A AMP AGC BUFF
DSFW
TC7SH32FU
DSCK
IC2461 IC2471B IC2281A IC2441B,C
LEVEL BU9480F M5218AFP NJM2058M NJM2058M
DSRS
CONV
Q331
2SD1801 IC372
BEEP
BA3308F
D351
RIPPLE STON
DAN222 14VA
FILTER ALC
Q351 IC311
AMP
UN9211 M5282FP
IC331
RL351
AHY103 TC4W53FU
EX-SP PWR AF
MUTE VCA
JACK AMP AMP
IC371 MONV
IC332 M5282FP
LA4425A
EXT-SP SPS AFGV AF
VCA
AFMS AAFO AMP
MSL1
MSL2
IC3771A TC7W04FU
OPTION
IC3771B
Q3771 2SA1576
Q3772 2SC4081
D3771 DAN222 SSTB UT-102 MIGV
CTXD
IC3002Z IC3005Z
BU4053BCFV
CI-V DRIVER BU4053BCFV
SBSY AMPO
CRXD
IC451
µPC5023-077
VOGV
MISL
IC3002X
BU4053BCFV
AF
VCA MOSL MOSL
AMP
IC362
TC4W53FU
MISL
AFO IC3004B
AF
ATT AMP BUFF NJM4558M
AF
AMP
AVXL
MOSL
PHONE
PHONE
BOARD JACK PHNI TIMER LED TRANSMIT TUNER MONITOR NB NR
TMDI TRAK
POWER TUNER LED MONITOR LED NB LED NR LED
MIC MICI
PWRK TNRD MOND NBD NRD
MIC
BOARD JACK
MUD
AF
PB1A AFL
RF/SQL
PBT1 PB1B RFL
BAL
PBT IC102C,D
PBT2 PB2A MC14071BFEL BALL
NR
NOTCH PB2B NRL
BOARD MIC GAIN
PITCH NOTL WAVE MIGL
RF POWER
PITL FORMER PWRL
COMP
CMPL
KEY SPEED
KYSL
BK-IN DELAY
DELL
TEN MODE KEY
KEY KEY JACK
WAVE
X4
FORMER
RIT DIAL
IC101B,C,D IC101A
TEN-KEY MODE KEY RIT µPD4030BG µPD4030BG
IC102A IC102B
BOARD BOARD BOARD BOARD
MC14071BFEL MC14071BFEL
9 - 1
DSP-A BOARD MAIN-A UNIT
FI111
R210 IC201B IC201A CFK455E10 Q141 D113,D114
IC151
BA15532F BA15532F (455kHz) 3SK131 1SV308
TC4W53FU
DRIF
(36kHz) IF CERAMIC IF
LPF
AMP BPF AMP
Q274
IC2281B
IC2281C,D (BW-15kHz) 2SC4081
NJM2058M AGC
NJM2058M IC2201Z RX TOTAL GAIN Q276 Q275 AGC
2SA1576
BU4053BCFV 2SC4081 AMP
LPF AMP Q278
DTAF
UN911H
D273 Q279 Q273 Q272
D271
IC2211B IC2211A MA2S111 2SC4081 2SK882 2SK882
IC153 IC152 1SS375
M5218AFP M5218AFP TC4SU69F TC4SU69F
GATE NB IF
LIMIT LO LO BUFF
LPF CTRL DET AMP
AMP AMP AMP
MODS
NBLV
Q241 UNLC
FI131
IC221 2SK882
IC2372Z CFWM455D
NJM1496V
BU4053BCFV
36kHz 455kHz IF
IC2441A BPF
AMP
NJM2058M
AF
AMP MODS
HPF
DRIV FI133
IC2473 CFWS455IT
TC4W53FU
IC2471A
M5218AFP DTIF BPF
IC2381B
µPC4574G2
LPF IF
AMP
Q521 IC101B
2SA1576 NJM4558M
IC2472A,B
M5218AFP
EALC ALC ALC BANV AMP BANS
AMP
LPF
IC551D IC551A
NJM2058M NJM2058M
DMAF ICH ALC IC805
AF AMP ALCL
LPF ICL AMP AN79L05M
AMP
FORV
IC571A -5V
IC2441D -8V -5V
NJM2058M NJM4558M REG
REFV
AMP FORL IC801 TRVI
IC551C
BA033T
NJM2058M
Q501
DMAF DRAF PHFS 3.3V
UMH11N 3R3V
ALC IC571B REG
Q502
FMTL AMP NJM4558M
P5OS UMH4N
IC802
PWR AMP REFL TA7805F
AMS
CTRL
IC301 +5V
TC4W53FU M5V
+14V REG
ALC
POCV AMP TXS
14V
IC3004A IC551B
IC361 SQLS NJM4558M
TC4W53FU IC3005X NJM2058M
D801
BU4053BCFV
MA8051
AMP IC803 Q804
TA7805F 2SD1801
AMOD BUFF
DTAF
+5V RIPPLE
Q471 D5VA
REG FIL
2SC4081
MOSL
RXS
IC3005Y IC3001
IC3003 M5282FP BU4053BCFV ISD4003-04MS
REC 8V
AF
VCA
AMP
IC3655 TC74AC08FT
VOSL
IC3656 TC74AC32FT
IC3551 IC3651 IC3501 IC3502 IC3504 IC3503 IC3751 IC3752,IC3753
MEMORY BOARD
S1D13504F00A000 TC74AC244FT HD64F2357F20 S-80942ANMP-DD6 RTC-4553A X25320SI-2.7 M62352GP BU4094BCFV
IC3553
LH61665AS-60A
LCD BUS MAIN
ROM RAM VRAM RESET RTC EEPROM D/A
CONT DRIVER CPU
IC1 IC2
SC-1380 ID171256SA25PZ
X3551 X3501
HV BACK UP BT3501
CSTCV26.00MXJ040 CR-520 CR2032
-8V
26MHz 19.6608MHz Q3504 2SA1576
D3504 MA2S111
VOXL +18V
D3505 MA2S111
D3506 MA2S111
IC841 NJM2360M
X401
Q841 2SB1124
BACK CR-567
LCD D841 RB050L-40
LIGHT 3.8304MHz
SUB
-15V CPU
14V DC-DC -15V
KIO
-15V IC401
HD6433832SD66H
+18V
IC501 TA79L08F
Q1201,Q1211 D501 1SS322
Q1221 IC1401
2SA1576 M52338FP -7V -7V
REG
RGB
IC881 TA79L08F
CTRL
-8V
IC1521B LCD
REG
M5218AFP INTERFACE
IC861 TA7805F
CONT
CNTV
CTRL +5V
5V
REG
Q801 2SC4081 Q803,Q804
IC821 BA6161F Q901-Q903 DTC114EE
Q802 2SC1201 2SC3647 Q821 2SC4081 Q904 2SC4081
MAIN DIAL D822 RD20M Q905 2SB1201
BKLV DC/AC
BKLV CTRL INVERT MDM0
+18V DIMMER
MDM1 LDV
DC-DC CTRL
MDM2
Q722 D531,D532 1SV265
XP4311
Q551 D533 1SV263
D535 MA77
2SK2171
R8V
R8V DRIVER
14V
IF PIN
FI711 ATT
NB AMP
Q721 FL-315
GATE
3SK131 (64.455MHz) D536
D941 HSB88WS Q531
2SC4081 MA2S111
64.455MHz
455kHz IF XTAL
ATT COMB
AMP BPF
DRIVER
(BW=15kHz)
Q271
2SK882 D631,D632 1SV265
ATT Q651 D633 1SV263
T8V T8V D741 HSB88WS
2SK2171 D635 MA77
64.455MHz
IF IF
ATT ATT
AMP AMP IF PIN
AMP ATT
Q261
Q631 D636
2SK882 MA2S111
R8V 2SC4081
T8V
IF
DRIVER
AMP
Q751
LO
2SK882
ALC AMP
AGC
64.455MHz
IF
Q701
AMP
2SK882
T8V ALC
T8V
ATT
FI841 FI843 Q812 Q811
D831
SFECV13.35MAS SFECV13.35MAS 2SK882 2SK882
HSB88WS
2LO
64.00000MHz CERAMIC CERAMIC IF IF
ATT
BPF BPF AMP AMP
SAGC
ATT D861
MA2S111
IC841 TA31136FN IC871A IC871B
NJM4558M NJM4558M SATV
AGC AGC
Q621 AMP SCPL
DET AMP
2SA1577
Q622
UMH11N
PAT8
PAT8
REG FI842
CFJ455K8
Q831
2SK882
CERAMIC
BPF
LO
Q611
AMP
2SD1619
Q612
2SC4081
D611
DA221
VCO-B
T8 T8V
S3LO 12.79-12.99MHz
REG
Q521 2SK508
D521 KV1470
D522 KV1470
Q601
2SD1619
Q602
Q71 2SC4081 Q522 2SC4213
2SC4081 Q81 2SC4405
D601
PSMT VCO
DA221
X2 SW
R8V
R8
REG Q802 IC801 Q801 Q501 2SK508
D501 KV1470
2SC4117 SC-1287 2SC4081
D502 KV1470
BUFF BPF D/A DDS AMP
Q502 2SC4213
VCO
S2LO PST7
IC3653,IC3654 IC3652 SW
77.8MHz
TC74AC574FT TC74AC245FT
Q551 2SK508
IC901
Q904 Q903 D551-D554
LC7153M
2SC2714 2SC4117 77.8MHz MA338
LOOP PLL
SERI BUS BUS LPF AMP BUFF FIL IC HPF
Q552 2SC4213
PARA DRIVER DRIVER
Q902
VCO
2SK508
SW
PSMT PST6
Q571 2SK508
D571-D574
IC902
MA338
TC7W08F
SW Q572 2SC4213
DATA
VCO
SW
IC701 Q701
SC-1287 2SC4081
3LO
491kHz
BPF D/A DDS AMP
COMMON LINE
8MHz
RX LINE PST5
TX LINE
IC1
DATA BUS LINE BU4094BCF
PSEL SERI
PST1
PSTB PARA
PST2
PST3
PST4
PST5
PST6
PST7
UNLC
DISPLAY BOARD PLL UNIT
Q445 XP4311
Q501,Q502 14V
Q511-Q514 2SK2171 DRIVER
2SK1740
RF LPF PRE1 B0
AMP
A
0.03-1.6MHz ATT
SPLIT LPF ATT
Q441 12dB
BLAV 2SK2171
Q442
RL122
B 2SK2171 BPF
BOARD 1.6-2.0MHz AHY103
Q601,Q602 BPF HPF
Q611-Q614 2SK2171 PRE
2SK1740 AMP
RF LPF IC451 2.0-3.0MHz B1 ATT2
AMP µPC1658G
BPF
PRE
AMP B2 D142
MA77
3.0-4.0MHz
Q452 XP4311
PRE2 BPF MUTE
8V B3
DRIVER
BLBV
4.0-6.0MHz
POFF BPF
D771
B4
HSB88WS
RF
LPF LPF ATT 6.0-8.0MHz
AMP
BPF
B5
IC961 IC961
µPC2708T µPC2708T
R8V T8V
8.0-11.0MHz
T8V BPF
D801 Q561 B6
YGR
1SV263 2SC4673 ATT
AMP
11.0-15.0MHz
PIN LO
LPF BPF IC151
ATT AMP µPC1678G
B7
Q801 15.0-22.0MHz
2SC4081 BPF
B8
DRIVE
22.0-30.0MHz B0-B10 DRIVER
LO
LPF BPF B10W
AMP
B9 POFF
IC903,IC904
Q661 PRE1 TD62783AF
2SC4673 Q901,Q902
50.0-54.0MHz PRE2
UMH11N
HPF RANS
Q903-Q905
B10 ATT1 XP4311
ATT2 D901-D905
30-50MHz
54-60MHz DAN222
BPF
B10W
MKRS
1LOA 64.485MHz-124.455MHz
VCO-A
Q601 Q661 Q361
2SC4403
DTC114EE DTC114EE
Q201 2SK508 Q301
D201 KV1470
2SC4403
BUFF D202 KV1470
BPF MUTE BPF MUTE
BUFF
Q202 2SC4213
Q424
Q651 UMD3N Q351
DTA114EE VCO DTA114EE
SW
PBMT PAMT
BPF DRIVER BPF
PBFS PAFS
CTRL CTRL
PST4 PST2
Q221 2SK508
D221,D222 KV1470
D451 Q151
MA357 2SK210
IC681 Q452 Q451 Q222 2SC4213 IC381 Q152 D151
LMX2306TM 2SC4081 2SK210 LMX2306TM 2SC4081 MA357
DATA VCO DATA
PLL LOOP PLL LOOP
BUFF SW BUFF
IC FIL IC FIL
Q402 Q102
IC401 IC101
2SC4081 Q251 2SK508 2SC4081
SC-1246A D251-D254 MA338 SC-1246A
IC402 IC102
TC7S04F AMP TC7S04F AMP
PHASE PHASE
LOOP Q252 2SC4213 LOOP
DET DET
FIL FIL
AMP AMP
VCO
SW
FI401 FI101
CFEC10,8MD11
CFEC10,8MD11 Q271 2SK508
D271-D274 MA338
CERAMIC CERAMIC
D/A DDS D/A DDS
BPF BPF
Q272 2SC4213
Q421,422,423,426 VCO Q121-Q123 UMD3N
SW
UMD3N Q126 UMD3N
DDS DDS
DRIVER DRIVER
Q103
LPF 1/4 2SC4081
VB1S AMP
VB2S
Q52
Q51
VB3S 2SC4081 Q403
2SC4403
VB4S 2SC4081 VA1S
BUFF VA2S
X52 AMP VA3S
CR-338
CAL PST2 VA4S
32.00056MHz
IC682 TA78L05F IC382 TA78L05F
+5 +5
8V 5V PLLB 8V 5V PLLA
Q2 UMD3N REG REG
LEVEL
CONV
RX ANT ANT2 ANT1
CHASSIS
LPF
RANS
TUNER UNIT
ATT
ANTS
6dB
RL101
RL121 D15
AHY103
AHY103 HSM88AS CURRENT
Q101
DET
UN9211
ATT1
Q14,Q16 DTC114EU
Q13,Q17 DTA114EU
TUNER
XVRT
ON/OFF
TRVI TUNING
CTRL
NET
Q143 UN9211
Q141 UMH11N
MUTE
Q151 UMH11N
CTRL
Q152 2SA1576
Q153 UN9211
Q12 DTC114EU
Q13 DTA114EU
T8V
TX/RX
CONRT
THRU
PAI
LPF ATT
RX IC5
LPF M38022M2-138FP X1 CR-569
6.144MHz
RESIST
D8,D9
DET
HSM88AS CPU
IC901,IC902,IC905 DATA
BU4094BCF
IC13
SERI
MCK D4 PHASE TA7805F
PARA
MDAT DWA010 DET
BSTB 14V +5 5V
REG
D1,D2 SWR
DET FOR
HSM88AS
REF
RF-A UNIT CTRL UNIT
CTIN
IC191
TC7S08F
Q2 Q4
MUTE 2SC1972 2SC5125
Q1 Q3 Q5
2SC1971 2SC1972 2SC5125
Q124
1.8MHz
UMD3N
PRE DRIVE PWR LPF
DRIVE AMP AMP
L1S
DRIVER
3.5MHz
LPF
BIAS BIAS
L2S
Q8
2SD1585K
7MHz
LPF
FAN L3S
CTRL
Q10 2SC4081
10MHz
Q11 2SC4081
Q12 2SB1201 LPF
Q13 2SB1201
L4S
14MHz
LPF
L5S
MKRS
18/21MHz
PST1 LPF
FUSE
DULS HV L6S
(5A)
IC1
TA7805F
24/28MHz
+5
H5V LPF
REG
L7S
14V
50MHz
IC2 Q9 UN9211
TA7805S D7 DAP222 LPF
L8S
+5 RELAY
5V
REG CTRL
IC3
COMMON
MC78T08C 13.8V
FILTER
+8
8V
REG
CON0
CON1
PA UNIT FILTER UNIT
CON2