Block Diagram - Icom IC-756PRO Service Manual

SECTION 9

BLOCK DIAGRAM

IC2091 S-80934ANMP-DDY
IC2041
IC2902 TC7502FU
TC7SHU04FU 3R3V
Q2321 2SJ381
IC2042 IC2301A
Q2322 2SJ381
X2041 TC7SH04FU uPC4570G2
CR-568
CLOCK DIFF IC2291 FMNS
DPGI SW
GENE CONV TC4W53FU
40MHz
IC2001 IC2051 IC2301B
ADSP-21061LKS-160 TC74VHC125FT uPC4570G2
IC2281C,D
NJM2058M
LEVEL DIFF
A/D
CONV CONV
IC2321
CS5396-KS
IC2211B
IC2201X
M5218AFP
CALS BU4053BCFV
TIMING IC2201Y
ACKS
BU4053BCFV
DSP IC2371B
IC2053
uPC4570G2
TC74HC02AF
IC2054 IC2341
TC74VHC74FT TC74VHC00FT AF/IF
AMP
IC2343
TC7WH74FU
IC2401
IC2372Z
MAX293CWE
LEVEL BU4053BCFV
TIMING
CONV
LPF
IC2072 IC2052 IC2351
TC7SET08FU
TC74VHC541FT AD1855JRS
IC2372Y
BU4053BCFV-E2
LEVEL IC2071 IC2473
ROM
CONV SC-1371 D/A BUFF TC4W53FU
IC2061,IC2063 IC2372X
IC2371A
IC2065,IC2066 BU4053BCFV-E2
CTFL uPC4570G2 IC2381C,D
TC7SET08FU
uPC4574G2
RTDT
IC2347
LEVEL
NSQO TC74HC390AF LPF
CONV
DSDR
DIV
BUFF
IC2381A
X2351 IC2302
IC2352 uPC4574G2
CR-643 IC2353 TC4W53FU
TC7SHU04FU
24.576MHz TC7SH04FU (36kHz)
IC2062 DIV BUFF
TC74VHC541FT
DSIR
IC2342
LEVEL DCWK
TC74VHC4040FT
CONV
DSFR
DSDW AF
IC2101 D/A BUFF AGC BUFF LPF
DSFW AMP
TC7SH32FU
DSCK
IC2461 IC2471B IC2281A IC2441B,C IC2441D
LEVEL BU9480F M5218AFP NJM2058M NJM2058M NJM2058M
DSRS
CONV
Q331
2SD1801 IC372
BEEP
BA3308F
D351 FMTL
RIPPLE STON
DAN222 14VA
FILTER
Q351 ALC
IC311
DTC114EE AMP
M5282FP
RL351 IC331 IC301
TC4W53FU
AHY103 TC4W53FU
EX-SP PWR AF
MUTE VCA
JACK AMP AMP
IC371 MONV
IC332 M5282FP
IC361
LA4425A
TC4W53FU
EXT-SP SPS AFGV
AF
VCA AMP
AFMS AAFO
MSL1
MSL2
OPTION
SSTB UT-102 MIGV IC3003 M5282FP
IC3002Z IC3005Z
BU4053BCFV BU4053BCFV
SBSY AMPO
VCA
IC451
uPC5023-077 VOGV
MISL
IC3002X
BU4053BCFV
VOSL
AF
VCA MOSL MOSL
AMP
IC362
TC4W53FU
MISL
AFO AF IC3004B
ATT BUFF IC1
AMP NJM4558M
AF SC-1380
AMP
AVXL
MOSL
VOXL
PHONE
PHONE
BOARD JACK PHNI TIMER LED TRANSMIT TUNER MONITOR NB NR
TMDI TRAK
KIO
POWER TUNER LED MONITOR LED NB LED NR LED
MICI
MIC
MIC PWRK TNRD MOND NBD NRD
BOARD JACK MUD
AF
PB1A AFL
RF/SQL
PBT1 PB1B RFL
BAL
IC102C,D
PBT PBT2 PB2A BALL
MC14071BFEL 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
MAIN DIAL
TEN MODE KEY
KEY KEY JACK WAVE
X4
FORMER
RIT DIAL
IC101B,C,D IC101A
TEN-KEY MODE KEY RIT
uPD4030BG uPD4030BG
BOARD BOARD BOARD BOARD IC102A IC102B
MC14071BFEL MC14071BFEL
9 - 1
DSP BOARD MAIN UNIT
FI111
IC201B CFK455E10 NBS D112
IC151
uPC4570G2 (455kHz) 1SV308
NJM1496V NBLS
(36kHz) DRIF CERAMIC NB
BUFF
BPF GATE
Q276 Q274
IC2281B
(BW-15kHz) 2SC4081 2SC4081
NJM2058M
IC2201Z Q277 Q275 AGC
R210 IC201A
BU4053BCFV UMH11N 2SA1576 AMP
LIMIT uPC4570G2
LPF Q278
AMP
DTAF UN911H
Q273 Q272 Q271
LPF D273
D271 2SK882 2SK882 2SK882
IC2211A MA2S111 1SS375
M5218AFP
GATE NB
RX TOTAL GAIN IF IF IF
LIMIT CTRL DET AMP AMP AMP
LPF
AMP
AMS
MODS
Q261
Q241 FI131
IC221 2SK882
2SK882 CFWM455D
NJM1496V
36kHz 455kHz
IF
IC2441A BPF
AMP
NJM2058M
MIXER MODS
HPF
AMP DRIV FI133 ALC
CFWS455IT
IC2471A
M5218AFP DTIF BPF
IC2381B
uPC4574G2
IF
AMP
Q521 IC101B
2SA1576 NJM4558M
IC2472A,B
M5218AFP
ALC
EALC ALC BANV AMP BANS
AMP
LPF
IC551D IC551A
NJM2058M NJM2058M
DMAF ICH ALC IC805
AMP ALCL
ICL AMP AN79L05M
FORV IC571A 5V
-8V -5V
NJM4558M REG
REFV
IC801
AMP FORL TRVI
IC551C BA033T
NJM2058M
Q501
DMAF DRAF PHFS 3.3V
UMH11N 3R3V
ALC IC571B REG
Q502
AMP NJM4558M
P5OS UMH4N
IC802
PWR AMP REFL TA7805F
AMS
CTRL
+5V
M5V
REG
+14V
ALC
POCV AMP TXS
14V
IC3004A IC551B
SQLS
NJM4558M NJM2058M
IC3005X
BU4053BCFV
IC803 Q804
AMP
TA7805F 2SD1801
AMOD BUFF
DTAF
+5V RIPPLE
Q471 D5VA
REG FIL
2SC4081
MOSL
RXS
IC3005Y IC3001
BU4053BCFV ISD33120S
CTXD
REC 8V
AF
CRXD
AMP
IC3551 IC3651 IC3501 IC3502 IC3504 IC3503 IC803 IC3751 IC3752
MEMORY BOARD
SED1354FOA TC74AC244FT HD64F2357F20 S-80942ANMP-DD6 RTC-4553A X25320SI-2.7 TA7805F M62352GP BU4094BCFV
IC3553
LH61665AS-60A
LCD BUS MAIN SERI
ROM RAM VRAM RESET RTC EEPROM EXPAND D/A
CONT DRIVER CPU PARA
IC2
ID171256SA25PZ BT3501
X3551 X3501
CR2032
CSTCV26.00MXJ040 CR-520
26MHz 19.66MHz -8V
+18V
IC841 NJM2360M
X401
Q841 2SB1124
BACK CR-567
LCD D841 RB050L-40
LIGHT 3.8304MHz
SUB
-15V CPU
14V -15V
DC-DC
IC401
HD6433042SF16
IC501 TA79L08F
D501 1SS322
Q1201,Q1211
Q1221 IC1401
-7V
2SA1576 M52338FP -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
D822 RD20M Q905 2SB1201
BKLV DC/AC
BKLV MDM0
CTRL INVCRT +18V DIMMER
MDM1 LDV
DC-DC CTRL
MDM2
Q945 Q551 D531,D532 1SV265
2SD1664 2SK1740 D533 1SV263
14VA D535 MA77
RIPPLE
R8V 14V R8V
FIL IF PIN
FI132 FI711 AMP ATT
SFPC455E-TC01 Q721 D781 1SV265 FL-315
(455kHz) Q941–Q944 3SK131 D783 1SV263 (64.455MHz) Q531 D536
2SK1740 2SC4081 MA2S111
64.455MHz
CERAMIC IF PIN XTAL
COMB
BPF AMP ATT BPF
455kHz DRIVE
(BW-15kHz) (BW=15kHz)
D631,D632 1SV265
Q651 D633 1SV263
D741 HSB88WS
2SK1740 D635 MA77
64.455MHz
IF PIN
AMP ATT
14VB
Q631 D636
R8V 2SC4081 MA2S111
T8V
IF
DRIVE
AMP
IC871C Q781 D784
NJM2058M 2SC4081 MA8056 Q751
LO
2SK882
AMP
AGC AMP DRIVE
IF
Q701
AMP
2SK882
T8V ALC
T8V
ATT
FI841 FI843 Q812 Q811
D831
SFECV13.35MA SFECV13.35MA 2SK882 2SK882
HSB88WS
2LO
CERAMIC CERAMIC IF IF
64.00000MHz HPF
BPF BPF AMP AMP
SAGC
D861
IC841 TA31136FN MA2S111
IC871A IC871B
NJM2058M NJM2058M SATV
AGC AGC
AMP SCPL
Q621 DET AMP
2SA1577
Q622
UMH11N
PAT8 PAT8
Q632
REG
FI842 2SD1664
CFJ455K8
14V RIPPLE 14VB
FIL
CERAMIC
Q611 BPF
2SD1619
Q612
2SC4081
D611
DA221
VCO-B
T8 T8V
S3LO 12.89MHzP100kHz
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
2SC4117 SC-1287 2SC4081 D501 KV1470
D502 KV1470
BUFF BPF D/A DDS AMP
Q502 2SC4213
VCO
S2LO PST7 SW
IC3753 IC3652-IC3654
77.8MHz
BU4094BCFV TC74AC245FT
Q551 2SK508
Q904 Q903 IC901 D551-D554
LC7153M
2SC2714 2SC4117 77.8MHz MA338
LOOP PLL
SERI LPF AMP BUFF HPF
INTERFACE FIL IC Q552 2SC4213
PARA
Q902
VCO
2SK508
PSMT PST6 SW
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
Q501
Q511–Q514 2SK2171
2SK1740
LPF AMP LPF PRE1 B0
A
64.455MHz
14VA
0.03-1.6MHz ATT
SPLIT ATT LPF
12dB
BLAV
Q441 2SK2171
RL122
B Q442 2SK2171
Q611 2SK1740 1.6-2.0MHz AHY103
Q612 2SK1740 LPF HPF
Q601
Q613 2SK1740 PRE
2SK2171
Q614 2SK1740 AMP
IC451
LPF AMP LPF 2.0-3.0MHz B1
uPC1658G
BPF
PRE
B2
AMP
14VB
3.0-4.0MHz
PRE2 BPF
B3
BLBV
4.0-6.0MHz
POFF BPF
D771
B4
HSB88WS
64.455MHz RF
LPF 6.0-8.0MHz
AMP
BPF
IC961 B5
R8V T8V uPC2708T
8.0-11.0MHz
T8V BPF
D801 Q561 B6
1SV263 2SC4673 ATT
11.0-15.0MHz
PIN LO
LPF BPF
ATT AMP
B7
14VA 15.0-22.0MHz
Q801
2SC4081 14VB BPF
B8
DRIVE
22.0-30.0MHz B0-B10
LO
LPF BPF B10W
AMP
B9 POFF
Q661 PRE1
2SC4673
50.0-54.0MHz PRE2
BPF RANV
Q532
2SD1664 B10 ATT1
ATT2
30-50MHz
14V RIPPLE 14VA 54-60MHz
FIL
BPF
B10W
MKRS
1LOA 64.485MHz-124.455MHz
VCO-A
Q601 Q361
Q661
2SC4403 DTC114EE
DTC114EE D202 KV1470 Q301
Q201 2SK508 2SC4403
BUFF D201 KV1470
BPF MUTE BPF
BUFF
Q202 2SC4213
Q424
Q651 UMD3N VCO Q351
DTA114EE DTA114EE
SW
PBMT
BPF DRIVER BPF
PBFS
CTRL CTRL
PST4 D221,D222 KV1470 PST2
Q221 2SK508
D451 D151
MA357 MA357
IC681 Q452 Q451 Q222 2SC4213 IC381 Q152 Q151
LMX2306TM 2SC4081 2SK210 LMX2306TM 2SC4081 2SK210
DATA VCO DATA
PLL LOOP PLL
BUFF SW BUFF
IC FIL IC
Q402 Q102
IC401 Q251 2SK508
2SC4081 2SC4081
SC-1246A D251-D254 MA338
IC402 IC102
TC7S04F AMP TC7S04F AMP
PHASE
LOOP Q252 2SC4213 LOOP
DET
FIL AMP FIL AMP
VCO
SW
FI401 FI101
CFEC10,8MD11 CFEC10,8MD11
Q271 2SK508
D271-D274 MA338
CERAMIC CERAMIC
D/A DDS D/A
BPF BPF
Q272 2SC4213
Q421,422,423,426 VCO Q121-Q123 UMD3N
UMD3N SW Q126 UMD3N
DDS
DRIVER DRIVER
LPF 1/4
VB1S
VB2S
Q52
Q51
VB3S 2SC4081
2SC4403 Q403
VB4S VA1S
2SC4081
BUFF VA2S
X52 AMP VA3S
CAL CR-338 PST2 VA4S
32.00056MHz
IC682 TA78L05F IC382 TA78L05F
+5 +5
8V 5V PLLB 8V
REG REG
Q2 UMD3N
LEVEL
CONV
RX ANT ANT2 ANT1
CHASSIS
LPF
RANV
TUNER UNIT
ATT
ANTS
6dB
RL121 RL101
D15
AHY103 AHY103 CURRENT
HSM88AS
DET
ATT2 ATT1
D142
Q14,Q16 DTC114EU
MA77
Q13,Q17 DTA114EU
TUNER
MUTE XVRT
ON/OFF
TRVI
CTRL TUNING
NET
Q141 UMH11N
Q151 UMH11N
MUTE
D151 MA2S111
CTRL
Q152 2SA1576
Q153 DTC114EE
Q12 DTC114EU
Q13 DTA114EU
T8V
TX/RX
CONRT
THRU
YGR PAI
LPF ATT
AMP
RX IC5
IC151 LPF M38022M2-138FP X1 CR-569
uPC1678G 6.144MHz
D8,D9 RESIST
HSM88AS DET CPU
IC901,IC902 DATA
BU4094BCF
IC13
SERI
DRIVER MCK PHASE TA7805F
PARA D4
MPAT DET
DWA010
+5
IC903,IC904 BSTB 14V 5V
REG
TD62783AF
Q901,Q902
UMH11N
SWR
Q903-Q905 D1,D2 FOR
DET
UMC3N HSM88AS
REF
RF UNIT CTRL UNIT
CTIN
IC191
TC7S08F
Q2 Q4
2SC1972 2SC5125
MUTE MUTE
Q1 Q3 Q5
2SC1971 2SC1972 2SC5125
Q124
1.8MHz
UMD3N PRE DRIVE PWR
LPF
DRIVE AMP AMP
PAMT L1S
DRIVER
PAFS
3.5MHz
LPF
BIAS BIAS
L2S
Q8
LOOP 2SD1585K
7MHz
FIL
LPF
L3S
FAN
IC101 CTRL
SC-1246A
Q10 2SC4081
Q11 2SC4081 10MHz
PHASE
Q12 2SB1201 LPF
DET
Q13 2SB1201 L4S
14MHz
LPF
L5S
DDS MKRS
18/21MHz
PST1 LPF
FUSE
DULS HV L6S
DDS (5A)
IC1
TA7805F
24/28MHz
+5
Q103 H5V LPF
REG
2SC4081 L7S
AMP 14V
50MHz
IC2 Q9 UN9211
TA7805S D7 DAP222 LPF
L8S
+5 RELAY
5V
REG CTRL
IC3
COMMON
MC78T08C 13.8V
FILTER
+8
8V
REG
5V PLLA
CON0
CON1
PA UNIT FILTER UNIT
CON2