Main Dial; Mode Board - Icom IC-756PROIII Service Manual

A
B
C
L10
L9
LA-480
LA-481
D
RL10
RL9 C33
18p TB1-160
TB1-160 C35
39p
18MHz
21MHz
C50 C51
0.0047 0.0047
L46
L45
LR-218
LR-394
RL16
RL15 C142 C145
TB1-160
TB1-160 39p 82p
10MHz
C137
C136
0.0047
0.0047
L4
L3
LR-138
LR-149
RL3 C10 RL4
TB1-160
TB1-160 300p
C12
100p
3.5MHz
C45
C44
0.0047
0.0047
L1 L2
LR-295
LR-294
C2 RL2
RL1
TB1-160 150p TB1-160
C5
120p
C3
1.9MHz 330p
C43
C42
0.0047
0.0047
L1S
E
L3S
F
L4S
G
L2S
H
L6S
I
MEASUREMENT CONDITIONS
VOLTMETER
SUPPLY VOLTAGE :13.8V
Explanatory notes DISPLAY
TX LINE
FILTER-A UNIT
J
LCD
K
L
M
J2 (CTRL) P1
CTIN 1
2
FRONT
L3S
J101
5VF
EP1 5VF
MAIN
MUP
MUP
MDN
DIAL
MDN
GND
GND
J120
J1 FRONT W4
L6S
RUP RUP
5VF 5VF
RDN RDN
GND GND
GND GND
GND GND
GND GND
GND GND
RIT
GND GND
BOARD GND GND
J1 FRONT W6 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
J1 FRONT W7 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
:50kΩ/VDC
LOCD LOCD
TXD TXD
:14.1MHz/USB
RXD RXD
NOTD NOTD
PBTD PBTD
GND GND
GND GND
GND GND
GND GND
TEN-KEY
GND GND
BOARD
GND GND
J322
J2 FRONT W2
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
J601 FRONT W5 J1
GND
5VF 5VF 3.5M
NOTL NOTL 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 GND
14V
14V
J451 P352
CO3
SPE
CO2
NC CO1
NC NVHF
SSP CI3
CHASSIS CI2
J452 P1 CI1
SSP
SSP + GND
SP1
NC GND
-
SSPE J3
SSPE
TUIN
FRONT W3
J941 J1
J4
TUNER-A
PHE PHE
TUOT
AFO 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 GND J2
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
+18V PLL
RF
W701
NC
W1851
W702
J701
14V W1852
3LO
14V
14V
PLL
NC
NC UNIT
PLL
W351 (PLL)P351
J351
J321 CHASSIS W14 W352
1LOA
14V
14V PLL
14V W651 (PLL)P651
J651
W652
NC
1LOB
NC
NC
PLL
NC W81 (PLL)P81
J81
CHASSIS W8 J1 W82
PHE
2LO
AFO 8V
PHE NC
PLL
TMD 5V W851 (PLL)P851
J851
W852
PWRK 5V
MKR
GND
PSTB
GND DRES
PLL
GND CON0 J801 W801 (PLL)P801
W802
GND CON1
S3LO
MICI CON2
PLL
8V PSEL
W901 (PLL)P901
J901
MSND UNLC
W902
MICE S2LO
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
3.5M
PY
PZ
5M PZ
(TUNER)
7M
J11 P2
MF2
T14V
10M
T14V
AW
14M AW
AX
18M
AX
AY
24M
AY
AZ
VHF
AZ
GND
GND
J741
14V J7 CHASSIS W12
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
GND NC
GND –8V
-8V
NC
J3 GND
P3
FORV FORV
TUIN
REFV REFV
ANTS
J4 ANTS
P4
DRES DRES
TUOT
GNDL GND
ISTA
J2 ISTA
IKEY
IKEY
RFRX
GNDL GND
FSTB FSTB
CHASSIS W7
J13
CMDT
CMDT
GND
CMCK CMCK
GND
L8S CHASSIS J5
W1
L7S
ANT1
L3S
L6S
CTRL-A
L5S CHASSIS J6
UNIT W2
L1S
ANT2
L2S
L4S
(PLL) P701 J211
3LO
(RF) P1851 J101
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
GND AMP
2IF
XVRT
–5V
PREAMP_IN
J807
NC
J1651 GND
GND
5V
POFF
PRE1
TRVI
GND
RANS
J1301 J804
PREAMP_OUT
R8V SATV
1LOA GND
BLBV
14VL CHASSIS
J451
W9 BLAY
PRE2
PRE1 BSTB SCPL
J1101
GND
GND MCK
1LOB
MDAT
MDAT
MCK
GND
SCPL BSTB
J1801
CHASSIS W8 J841
BLAV
2LO
GND
BLBV
J801 J803
SATV GND
GND B1
NC NC
J951
GND B4
14V
TRVI
MKR
BPF-A_IN GND
14V
5V
GND GND
NC UNLC
GND GND
PSEL
–5V
J2001
CON2
R8V
BPF-A
S3LO J802 J805
NC CON1
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
DSP-A SPE
J201 J2001 J2002 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
NC
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
G
R
YOBI
DRES
LMFD
LFMD
J641 P2 J3
ETE
ETE
MAIN-A
ET14
ET14
ETST
UNIT
ETST
ETKY
ETKY
EXT TUNER
CHASSIS W13
J3503 J1 J2 J3504 J771
MEMORY
PAT8
A18 D8
A9 D7
PWRS
A8 A17 D6 D9
ICL
A7 A16 D5 D10
ICH
A15 D11
A6 D4
H5V
A14 D3 D12
A5 8V
A4 A13 D2 D13
8V
A3 A12 D1 D14
14VA
A11 D15
A2 D0
14VA
A1 A10s GND GND
14V
A0 A10f GND GND
14V
GND GND
GND HWR
14V
GND RD GND
RESET 14V
BYTE GND RD GND
14V
VCC GND CSs GND
14V
GND GND
VCC CSf
14V
5V
5V
HV
NC
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
J861 CHASSIS W14
NC
NC
SQSS
NC
MICE
MSND
8V
MICI
GND
GND
GND
GND
PWRK
TMD
SPE
AFO
SPE
NC
NC
NC
NC
14V
14V
14V