Icom IC-756PRO Service Manual

R14 47
R13 47
Q2
2SC1972
Q3
2SC1972
C21 0.001
R20 10
R21 10
C23 0.001
R23 10
R24 10
L10
R27 10
R26 10
Q4
2SC5125
Q5
2SC5125
R42
5.6
R41
5.6
L7 LR-83
C25 200p
C116 100p
L6 LR-393
C58 0.001
L4
LR-143
L2 EXC-ELDR25C
R16
100
R15
100
C12 0.0047
C11 0.0047
C7 0.0047
R10
680
Q1
2SC1971
R5 390 R6 220
R7 4.7
C4 0.001 C2 0.001 R4 220
C1
0.1
C41
0.001
R2
18
R3 330
R1 330
L14
LR-360
J1
C5 0.1 C6 0.001
C9 0.1 D1 MA29B C27 0.047
C8 47
R12 68
R11 500
L3 EXC-ELDR25C
R17 10
C16 10
EP3EP2
C14 0.1
L5 EXC-ELDR25C
C17
0.047
C18
0.047
D2
MA29B
D3
MA29B
C107 0.0047 C39 1000 C40 1000
L8 LR-230
R31
1k
R29
1k
C34 0.0047
C108 0.0047
R28 5
C35 0.047 C36 1000
R18 2k
R19 470
C99 470
+
-
M
J11
C97 0.0047
D10
MA185
R51
56
C96
220
C102
0.0047
R55
10k
R54 1k
Q12
2SB1201
Q13
2SB1201
C101
0.0047
R56
10k
C100 0.0047
R52
10
R53
1k
C93 0.1
R49 1k
C95 0.0047
C103 10
R46 27k R47 33k
R45 3.3k R48 2.2k
R50 ERT-D2FHL503S
D9
DAP222
C94 0.0047
Q11
2SC4081
C30 0.1 D4 DSA3A1 D8 DSA3A1 D5 DSA3A1
C42 0.1
C113 0.0047
D7
DAP222
Q9
UN9211
F1
C81 10 C79 0.1 C80 0.1
C77 100 C75 0.1
IC1
TA7805F
IC2
TA7805S
IC3
MC78T08C
Q10
2SC4081
IO
G
I
G
O
I
G
O
C114 0.0047
C73 10 C72 0.1
C76 0.1
C74 10
C78 100
C82 10
J3
14VA
14VA
8V
8V
H5V
ICH
ICL
PWRS
PAT8
14V
14V
14V
14V
14V
14V
14V
5V
5V
J2
RL1
AJV5341
L31
LA-547
L29
LA-548
L30
LA-550
C86
22p
C83
6p
C85
15p
C77 33p
C78 47p
C80 47p
C82 39p
L5
LR-216
L6
LR-216
C18
100p
C22
22p
C16 200p C17 180p C20 300p C21 300p C25 330p C23 330p C24 330p
J1
1 PAO
2
RL13
AG201344
RL5
TB1-160
C87
0.0047
L32 10uH
L24
LR-387
L25
LA-388
C37
27p
C155 33p
C38 100p
L8
LR-240
L28
LR-241
C30
18p
C63
47p
C28 100p C31 100p C102 100p C65 100p
L9
LA-481
L10
LA-480
C33
18p
C35
39p
C32 120p C104 120p C34 120p C36 100p
C7 300p C8 300p C69 300p C68 300p C67 300p C66 300p C14 300p C15 390p
C10
300p
C12
100p
L3
LR-149
L4
LR-138
L1
LR-294
L2
LR-295
C2
150p
C5
120p
C3
330p
C98 620p
C97 620p C75 620p C74 620p C73 620p C72 220p C100 620p
C42
0.0047
L13 100uH
RL1
TB1-160
C44
0.0047
L15 100uH
RL3
TB1-160
C50
0.0047
L21 10uH
RL9
TB1-160
RL7
TB1-160
C48
0.0047
L19 100uH
RL11
TB1-160
C52
0.0047
L23 10uH
C46
0.0047
L17 100uH
C43
0.0047
C88
0.0047
C47
0.0047
C53
0.0047
C49
0.0047
C51
0.0047
C45
0.0047
RL2
TB1-160
RL4
TB1-160
RL10
TB1-160
RL8
TB1-160
RL12
TB1-160
RL6
TB1-160
RL14
AG201344
W8
50MHz
7MHz
24MHz
28MHz
18MHz
21MHz
3.5MHz
1.9MHz
L501
LR-386
C507 0.1
EP501
EP502
J3
GND
L8S
L7S
L3S
L6S
L5S
L1S
L2S
L4S
GND
+
-
SP1
MAIN
DIAL
J101
J120
J1
RIT
BOARD
J201
J1
MODE
BOARD
J221
J1
TEN-KEY
BOARD
J2 J241
MIC BOARD
J2
J322
J321
KEY
BOARD
J1
J921
J2
J1
PHONE
BOARD
J2
J941
J452
J451
J601
J1
PBT
BOARD
J5
J8
J1
TUNER
BOARD
J11
J10
J7
J3
J4
J3
J4
J13
CTRL
UNIT
J741
J641
J811
J841
J861
J352
J771
MAIN
UNIT
2
1
J2
CTIN
J4
ACS2
GND
HV
ACS1
GND
HV
FILTER UNIT
PA UNIT
14V
14V
14V
GND
T8V
GND
5V
5V
GND
-8V
GND
FORV
REFV
ANTS
DRES
GND
ISTA
IKEY
GND
FSTB
MDAT
MCK
14V
14V
AGC
8V
ALC
T8V
NC
NC
R8V
-5V
NC
5V
TRVI
RANS
SATV
BLBV
BLAY
SCPL
GND
MDAT
MCK
BSTB
GND
GND
NC
14V
14V
UNLC
PSEL
CON2
CON1
CON0
DRES
PSTB
5V
5V
NC
8V
NC
NC
SQSS
AFO
MICE
MSND
8V
MICI
GND
GND
GND
GND
PWRK
TMD
SPE
AFO
SPE
NC
NC
NC
NC
14V
PAT8
PWRS
ICL
ICH
H5V
8V
8V
14VA
14VA
14V
14V
14V
14V
14V
14V
14V
5V
5V
HV
GND
NC
GND
GND
GND
GND
GND
GND
GND
GND
GND
MDN
RUP
5VF
RDN
F5K
F4K
F3K
F2K
F1K
SPEK
EXTK
FILK
AMK
CWK
SSBK
KI2
KI1
5VF
MICI
M8V
MUD
SQLS
MSND
GND
MMICE
AFO
14V
NC
NC
NC
NC
PHE
AFO
PHE
TMD
PWRK
GND
GND
GND
GND
MICI
8V
MSND
MICE
AFO
SQSS
NC
NC
DASH
DOT
PHE
PHO
PHE
PHNI
SSP
SSPE
5VF
NOTL
PITL
PB1A
PB1B
5VF
NOTL
PITL
PB1A
PB1B
RUP
5VF
RDN
F5K
F4K
F3K
F2K
F1K
SPEK
EXTK
FILK
AMK
CWK
SSBK
KI2
KI1
5VF
MICI
M8V
MUD
SQLS
MSND
GND
MMICE
AFO
PLL
UNIT
J1
8V
NC
5V
5V
PSTB
DRES
CON0
CON1
CON2
14V
14V
NC
GND
GND
J951
J151
RF
UNIT
BSTB
MCK
MDAT
GND
SCPL
BLAV
BLBV
SATV
RANS
TRVI
5V
NC
-5V
R8V
NC
NC
T8V
ALC
8V
AGC
14V
14V
14V
14V
14V
NC
T8V
NC
5V
5V
NC
-8V
NC
FORV
REFV
ANTS
DRES
GND
ISTA
IKEY
GND
FSTB
CMDT
CMCK
GND
GND
3.5M
7M
10M
14M
18M
24M
VHF
GND
NC
14V
14V
CO3
CO2
CO1
NVHF
CI3
CI2
CI1
GND
GND
GND
GND
3.5M
7M
10M
14M
18M
24M
VHF
GND
NC
14V
14V
CO3
CO2
CO1
NVHF
CI3
CI2
CI1
GND
GND
L4S L2S L1S L5S L6S L3S L7S L8S GND GND
CHASSIS W12
CHASSIS W13
FRONT W4
FRONT W6
FRONT W1
FRONT W5
FRONT W7
FRONT W3
PHE
AFO
PHE
PHNI
DASH
DOT
FRONT W8
FRONT W2
CHASSIS W11
CHASSIS W7
CHASSIS W13
L1
LR-361
L22 EXC-ELDR25C
C20
0.1
Q8
2SD1585K
PAO
MF1
DISPLAY
BOARD
PAI
L12 EXC-ELDR25C
CHASSIS
3
2
1
6
5
4
CHASSIS
J10
P2
CHASSIS W7
NC
NC
NC
NC
GNDGND
GND
GND
GND
PBTD
NOTD
RXD
TXD
LOCD
LDV
KI3
5VF
KI4
NOTK
PBTK
LOCK
XFCK
TSK
MCLK
MWK
MDNK
MUPK
GND
GND
GND
PBTD
NOTD
RXD
TXD
LOCD
LDV
KI3
5VF
KI4
NOTK
PBTK
LOCK
XFCK
TSK
MCLK
MWK
MDNK
MUPK
GND GND
MPRK
MPWK
FINK
GENK
50K
28K
24K
21K
18K
14K
10K
7K
3K
1K
SPLK
MPRK
MPWK
FINK
GENK
50K
28K
24K
21K
18K
14K
10K
7K
3K
1K
SPLK
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
NC
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
CHASSIS
FRONT
GND
PB2A
PB2B
GND
GND
GND
PB2A
PB2B
GND
GND
GND
(CTRL)P1
P352
SPE
NC
NC
SSP
SSP
SPE
M2
M1
P2
P1
TUIN
TUOT
TUIN
TUOT
P3
P4
J2
RFRX
ANT1
W1
CHASSIS J5
W2
CHASSIS J6
ANT2
(RF)P741
(PLL)P701
T/R2IF
3LO
J211
J101
CHASSIS W9
CHASSIS W8
CHASSIS
W9
CHASSIS W8
3LO
J701
(PLL)P351
1LOA
J561
J351
1LOA
1LOB
J651
J661
1LOB
(PLL)P651
(PLL)P81
2LO
J901
J81
2LO
J851
J481
MKR
(PLL)P851
MKR
S3LO
(PLL)P801
S3LO
J841
J801
(PA)P1
PAI
J101
RX
(CTRL)P2
J741
T/R2IF
CTIN
R57 220
C3 0.1
C10 150p
R8 1
R9 1
C105 100
R33
0.68
R32
0.68
C15 0.1
C37 0.1
MF+
MF-
MF+
MF-
C33 0.0047 C110 0.0047
C111 0.0047
EP5
EP4
CHASSIS
W17
CHASSIS
W16
HV
C89 0.1
C109 0.0047
C112 0.0047
C115 0.0047
C71 0.1
R44
3.9
CHASSIS
W17
CHASSIS
W16
FHV
FGND
C39
27p
C40 68p
5VF
MUP
GND
5VF
MUP
MDN
SSP
SSPE
P1
AZ
T14V
AW
AX
AY
PZ
T14V
PW
PX
PY
PZ
T14V
PW
PX
PY
AZ
T14V
AW
AX
AY
ETKY
ETE
ET14
ETST
ETKY
ETE
ET14
ETST
J3P2
EXT TUNER
CHASSIS W14
AGRS
GND
M5V_d
GND
DSDR
NC
NC
MCK
DSFW
MDAT
DSFR
CTFL
RTDT
GND
GND
3R3V_d
3R3V_d
GND
NSQO
DPGI
MODS
FMNS
CALS
ACKS
DSRS
AMS
TXS
MSL1
DSKY
GND
J2002
GND
FMTL
GND
GND
GND
GND
DRAF
DTAF
GND
DMAF
D5VA
D5VA
D5VA
DRIF
GND
8V
8V
-5V
-5V
-8V
-8V
GND
AGC
GND
GND
GND
GND
GND
DTIF
GND
J2001
DSP
PGND
PHV
CHASSIS W14
R35
0.68
R34
0.68
EXC-ELDR25C
C57 200p
C141 270p C143 220p C144 220p C146 82p
C142
39p
C145
82p
L45
LR-394
L46
LR-218
C136
0.0047
RL15
TB1-160
C137
0.0047
RL16
TB1-160
10MHz
L41 10uH
PGND
PHV
C508 0.0047
L502
LR-386
C503 0.0047
C501 0.1 C502 0.1
C504 0.0047
C515 0.0047
C513 0.1 C514 0.1
C516 0.0047
C523 0.1
C521 0.0047 C522 0.0047
C524 0.1
C22 0.001
C61 0.001
C24 0.001
C62 0.001
L9
C60 200p C59 200p
C41
7p
C157 33p
C156 68p
14MHz
C99 620p
C151 330p C152 620p
C153 330p
GND
GND
GND
GND
14V
14V
J301
YOBI
SRES
R
G
B
HSYNC
VSYNC
GND
GND
GND
GND
NC
-8V
-8V
NC
+18V
NC
14V
14V
14V
NC
NC
CHASSIS W10
LFMD
LMFD
S2LO
(PLL)P901
S2LO
J831
J901
J201 J202
J891
YOBI
DRES
R
G
B
HSYNC
YSYNC
GND
GND
GND
GND
NC
-8V
-8V
NC
NC
NC
14V
14V
14V
NC
NC
CHASSIS W10
LFMD
LMFD
14V
14V
J111
RANT
XVRT
PSEL
UNLC
L26
LR-388
C117 47p
C120 150p
W29
PAT8
W14
C118
120p
L21 LA-262
R40 4.7
R39 4.7 R38 4.7
C121 47
CP39
CP40
F2
F3
CP1
CP2
14V
NC
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
W9
W10
CP503
CP504
CP502
CP501
CP11
CP12
C79 47p C81 47p
C158 33p
CP13 CP14
L5S
EP1
W6 W7 W4 W5 W2 W3 W1
CP1
CP2
CP3
CP4
CP5
CP6
CP7
CP8
CP10
PLL
W701
W702
RF
W741
W742
PLL
W351
W352
PLL
W651
W652
PLL
W81
W82
PLL
W851
W852
PLL
W801
W802
PLL
W901
W902
MEMORY
J1J3503
J2
J3504
D8
D9
D10
D11
D12
D13
D14
D15
GND
GND
GND
GND
GND
GND
GND
D7
D6
D5
D4
D3
D2
D1
D0
GND
GND
HWR
RD
RD
CSO
CS3
A17
A18
A16
A15
A14
A13
A12
A11
A10s
A10f
GND
GND
GND
GND
GND
A8
A9
A7
A6
A5
A4
A3
A2
A1
A0
GND
RESET
BYTE
VCC
VCC
CP9
NC
CFL-
-15V L18V
N/P
NC NC
U/D L/R
NC
GND
VCOM
BL GL RL
L5V
NC
GND
NC NC
POLC
NC VD HD
L5V
NC
NC
CFL+
J802
J801
CFL-
NC NC
CFL+
-15V
L18V
N/P
NC NC
U/D
L/R
NC
GND
VCOM
BL
GL
RL
L5V
NC
GND
NC NC
POLC
NC
VD
HD
L5V
NC
LCD
PA
W1
R58 220
C122 22p
EXC-ELDR25C
C119 120p
C123
18p
PA
W3
L8S
L3S
L7S
L5S
C103 120p C62 100p
L3S
L8S
L7S
L5S
L6S
L4S
L2S
L1S
L1S
L2S
L4S
L5S
L6S
J531
RX 0V
TX 0.68V
RX 13.8V
TX 13.6V
RX 0V
TX 1.77V
RX 13.7V
TX 13.6V
RX 0V
TX 0.65V
RX 13.8V
TX 13.6V
RX 1.0V
TX 7.0V
13.5V
12.2V
RX 13.6V
TX 13.5V
RX 0V
TX 13.4V
RX 0V
TX 7.8V
RX 13.5V
TX 12.7V
RX 12.7V
TX 0V
RX 0V
TX 0.75V
RX 0V
TX 0.3V
4.9V
4.9V
7.9V
13.8V
4.4V
13.8V
13.8V
Selected 10.1V
MEASUREMENT CONDITIONS
VOLTMETER :50kΩ/VDC
OSCILLOSCOPE :20MHz 1MΩ25pF
SUPPLY VOLTAGE:13.8V
DISPLAY :14.1MHz USB
MEASUREMENT CONDITIONS
VOLTMETER :50kΩ/VDC
SUPPLY VOLTAGE :13.8V
10-7 PAAND FILTER UNITS
10 - 7

Icom IC-756PRO Specifications

General

Brand	Icom
Model	IC-756PRO
Category	Transceiver
Language	English