Icom IC-756proIII Service Manual page 101

A
B
L10
L9
LA-481 LA-480
C
C33 RL10
RL9
TB1-160 18p TB1-160
C35
47p
18MHz
21MHz
C50 C51
0.0047 0.0047
L45 L46
LR-394 LR-218
RL15 C142 C145 RL16
TB1-160
TB1-160 39p 82p
10MHz
C136
0.0047
C137
0.0047
L4
L3
LR-138
LR-149
RL4
RL3 C10
TB1-160
TB1-160 330p
C12
100p
3.5MHz
C45
C44
0.0047
0.0047
L2
L1
LR-294 LR-295
C2 RL2
RL1
TB1-160 150p TB1-160
C5
120p
C3
1.9MHz 330p
C42
C43
0.0047
0.0047
D
L1S
E
L3S
L4S
F
L2S
G
L6S
H
Explanatory notes
TX LINE
FILTER-A UNIT
LCD
I
J
K
J2
(CTRL) P1
CTIN 1
2
FRONT
L3S
J101
5VF
EP1 5VF
MAIN
MUP
MUP
DIAL MDN
MDN
GND
GND
FRONT W4 J120
J1
L6S
RUP RUP
5VF 5VF
RDN RDN
GND GND
GND GND
GND GND
GND GND
GND GND
RIT
GND GND
BOARD GND GND
FRONT W6
J1 J201
F5K F5K
L4S
F4K F4K
F3K F3K
F2K F2K
F1K F1K
SPEK SPEK
EXTK EXTK
FILK FILK
AMK AMK
CWK CWK
SSBK SSBK
KI2 KI2
KI1 KI1
5VF 5VF
MODE
GND GND
BOARD GND GND
L2S
FRONT W7
J1 J221
SPLK SPLK
1K 1K
3K 3K
7K 7K
10K 10K
14K 14K
18K 18K
21K 21K
24K 24K
28K 28K
50K 50K
GENK GENK
L1S
FINK FINK
MPWK MPWK
MPRK MPRK
GND GND DISPLAY
J2 FRONT W8 J241
BOARD
MUPK MUPK
MDNK MDNK
MWK MWK
MCLK MCLK
TSK TSK
XFCK XFCK
LOCK LOCK
PBTK PBTK
NOTK NOTK
KI4 KI4
5VF 5VF
KI3 KI3
LDV LDV
LOCD LOCD
TXD TXD
RXD RXD
NOTD NOTD
PBTD PBTD
GND GND
GND GND
GND GND
GND GND
TEN-KEY
GND GND
BOARD GND GND
J2 FRONT W2 J322
MICI MICI
M8V M8V
MUD MUD
SQLS SQLS
MSND MSND
GND GND
MMICE MMICE
AFO AFO
NC NC
MIC BOARD NC NC
CHASSIS W11
J5
FRONT W5
J601 J1 GND
5VF 5VF GND
NOTL NOTL
3.5M
PITL PITL 7M
PB1A PB1A 10M
PB1B PB1B
14M
PB2A PB2A 18M
PB2B PB2B
24M
GND GND VHF
PBT
GND GND GND
GND GND
BOARD NC
14V
14V
J451 P352 CO3
SPE CO2
NC
CO1
NC NVHF
SSP CI3
CHASSIS CI2
J452 P1 CI1
SSP
SSP + GND
SP1 GND
NC
-
SSPE
SSPE
J3
TUIN
J941 FRONT W3
J1
TUNER-A J4
PHE PHE
TUOT
PHO PHO BOARD
PHE PHE
J2
PHNI PHNI
GND GND
GND GND
GND GND
GND GND
PHONE
GND GND
GND GND
BOARD
FRONT W1
J921 J1
DASH DASH
DOT
DOT
GND GND
GND J2
GND
GND
GND
GND GND
GND
GND
GND GND
GND KEY
GND
GND
GND BOARD
J301 CHASSIS W10
LFMD
LMFD
SRES
YOBI
R
G
B
HSYNC
VSYNC
GND
GND
GND
GND
NC
-8V
(CTRL)P2
-8V
NC
PLL
+18V
RF
W701
NC
W1851
J701 W702
W1852
14V
3LO
14V
14V
PLL
NC
NC
UNIT
PLL
W351
J351 (PLL)P351
J321 CHASSIS W14 W352
1LOA
14V
14V PLL
14V W651 (PLL)P651
J651
W652
NC
1LOB
NC
NC
PLL
W81
NC J81 (PLL)P81
CHASSIS W8 J1 W82
PHE
2LO
PHO 8V
PHE
NC PLL
TMD 5V W851 (PLL)P851
J851
W852
PWRK 5V
MKR
GND PSTB
GND DRES
PLL
W801
GND CON0 J801 (PLL)P801
W802
GND CON1
S3LO
MICI CON2
PLL
8V PSEL
W901
J901 (PLL)P901
MSND UNLK
W902
S2LO
MICE 14V
NC 14V
SQSS NC (PA)P1
NC
GND
NC GND
(TUNER)
J1 MF1
CTIN
J10 P1
T14V
T14V
PW
J8
PW
PX
GND
PX
PY
GND PY
PZ
3.5M
PZ
(TUNER)
7M J11 P2
T14V MF2
10M
T14V
AW
14M
AW
AX
18M AX
AY
24M
AY
AZ
VHF
AZ
GND
NC
CHASSIS W12 J741
14V J7
14V
14V 14V
CO3 14V
14V
CO2 14V 14V
CO1 NC
GND
NVHF T8V T8V
CI3
GND NC
CI2 5V
5V
CI1 5V 5V
GND NC
GND
GND –8V
-8V
GND NC
P3 J3
FORV
FORV
TUIN
REFV REFV
ANTS ANTS
P4 J4
DRES
DRES
TUOT
GNDL GNDL
ISTA
J2 ISTA
IKEY IKEY
RFRX
GNDL GNDL
FSTB
FSTB
CHASSIS W7 J13
CMDT CMDT
GND
CMCK
CMCK
GND
CHASSIS J5
L8S
L7S W1
ANT1
L3S
L6S
CTRL-A
L5S CHASSIS J6
UNIT W2
L1S
ANT2
L2S
L4S
(PLL) P701 J211
3LO
J101
(RF) P1851
T/R2IF
CHASSIS W9 J811
14V
14V
AGC
RF-B
8V
J101
UNIT
ALC
J102
RX
T8V
RANT
NC
J809
PRE NC
J1851
GND
R8V
AMP
2IF GND
XVRT
–5V
PREAMP_IN
J807
NC
J1651 GND
GND
5V
POFF
PRE1_W
TRVI
GND
RANS
J1301 J804
PREAMP_OUT
R8V SATV
1LOA
GND
BLBV
14VL CHASSIS
J451
PRE2 W9 BLAV
PRE1 BSTB SCPL
J1101
GND
GND MCK
1LOB
MDAT MDAT
MCK
GND
BSTB
J1801 SCPL
BLAV CHASSIS W8 J841
2LO
GND
BLBV
J801 J803
GND
SATV
GND B1
RANS NC
J951
GND B4
14V
TRVI
MKR
BPF-A_IN GND
5V 14V
GND GND
UNLK
NC
GND GND
PSEL
J2001 –5V
R8V CON2
BPF-A
S3LO
J802 J805
CON1
NC
B3 GND
NC CON0
B5 GND
J2101
DRES
T8V
B2 BPF-A_OUT
S2LO PSTB
ALC
GND GND
8V 5V
GND GND
5V
J201 AGC
NC
14V
PAI
14V 8V
10 - 16
J352
SSP
SPE
J2002
J201 J2001 J202
GND 8V AGRS 3R3V_d
FMTL 8V GND 3R3V_d
J891 CHASSIS W10
GND –5V M5V_d GND
NC
GND –5V GND NSQO
NC
GND –8V DSDR DPGI
14V
GND –8V NC MODS
14V
DRAF GND NC FMNS 14V
DTAF AGC MCK CALS
NC
GND GND DSFW ACKS
+18V
DMAF GND MDAT DSRS
NC
D5VA GND DSFR AMS
–8V
D5VA GND CTFL TXS
–8V
D5VA GND RTDT MSL1
NC
DRIF DTIF GND DSKY
GND
GND GND GND GND
GND
GND
GND
YSYNC
HSYNC
B
DSP-A
G
R
YOBI
DRES
LMFD
LFMD
J641 P2 J3
ETE
ETE
MAIN-A
ET14
ET14
ETST
UNIT
ETST
ETKY
ETKY
EXT TUNER
J3503 J1 J2 J3504 J771 CHASSIS W13
MEMORY
PAT8
A18 D8
A9 D7
PWRS
A8 A17 D6 D9
ICL
A7 A16 D5 D10
ICH
A15 D11
A6 D4
H5V
A5 A14 D3 D12
8V
D13
A4 A13 D2
8V
A12 D1 D14
A3 14VA
A2 A11 D0 D15
14VA
A10s GND
A1 GND
14V
A0 A10f GND GND
14V
GND GND HWR GND
14V
GND RDs GND
RESET 14V
BYTE GND RDf GND
14V
GND GND
VCC CSs
14V
VCC GND CSf GND
14V
5V
5V
HV
NC
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
CHASSIS W14
J861
NC
NC
SQSS
PHO
MICE
MSND
8V
MICI
GND
GND
GND
GND
PWRK
TMD
PHE
PHO
PHE
NC
NC
NC
NC
14V
14V
14V