![background image](http://html.mh-extra.com/html/icom/ic-756pro-iii/ic-756pro-iii_service-manual_612292088.webp)
10 - 5
R137
47
R136
10k
6
5
IC14c
TC74AC04F
R15
100
D4
DWA010
C16
0.0047
C13
33p
C14
33p
C12
3p
R140
47
R139
10k
IC14e
TC74AC04F
11
10
R17
100
D5
HSM88ASR
C17
82p
C15
33p
R16
33
L4
LR-364
R46
4.7k
14V
14V
5V
5V
-8V
5V
14V
C38
0.0047
Q5
2SK515
R45
10k
C36
0.001
R44
1M
R42
10k
C35
0.0047
R43
10k
C37
0.0047
D9
HSM88AS
C100
100p
L9
2.2mH
C33
150p
R41
82
L8
LR-364
D8
HSM88AS
C32
1p
C20
0.0047
C9
0.0047
C70
C305
0.1
C229
0.0047
C306
10
10
3
2
8
1
4
+
-
IC1a
NJM4558M
C8
0.0047
C69
10
-
+
7
6
5
IC1b
NJM4558M
R8
220k
R7
220k
R100
68k
R101
68k
R5
220k
R6
220k
C6
0.001
C7
0.001
R3
10k
R4
10k
R1
15
R2
15
D1
HSM88AS
D2
HSM88AS
L1
LR-364
C5
75p
C4
2p
C2
68p
C1
2p
C3
20p
R9
1M
R10
820k
RL4
AE5343
RL1
FXE-12G
D17
1SS301
Q59
DTC114EU
Q51
DTC114EU
Q52
DTC114EU
D16
1SS301
C58
0.0047
Q13
DTA114EU
Q12
DTC114EU
R58
2P-50-W1L301
L27
LA-246
C64
15p
C63
47p
C65
82p
C105
75p
C66
33p
L28
LA-236
RL2
FXE-12G
D18
1SS301
C59
0.0047
C60
0.0047
C109
0.1
D22
MMBV3700L
T1
D23
MMBV3700LT1
R152
4.7k
R151
820
R150
C302 50p
C301 27p
C303 50p
390
R153
4.7k
Q25
2SC4213
R155
390
R154
2.2k
D20
1SS301
Q22
DTA114EU
Q21
DTC114EU
RL3
G5A-237P
C62
0.0047
L22
LR-364
R83
15
D15
HSM88AS
J6
ANT2
W2
J5
ANT1
W1
CHASSIS
J3
TUIN
P3
P4
TUOT
J4
J2
RFRX
P2
J3
TUIN
TUOT
to RF-B
unit
J101
J1
CTIN
P1
to
FILTER-A
unit
J2
J8
C73 0.0047
C74 0.0047
C75 0.0047
C76 0.0047
C77 0.0047
C78 0.0047
C79 0.0047
C80 0.0047
C81 0.0047
C82 0.0047
C83 0.0047
C84 0.0047
C85 0.0047
C86 0.0047
R114 1k
R113 1k
R112 1k
R111 1k
R110 1k
R109 1k
R108 1k
R115 1k
R116 1k
R117 1k
R118 1k
R119 1k
R120 1k
R121 1k
7M
CI2
CO2
a
b
c
d
e
10M
14M
18M
24M
VHF
CO3
CO1
NVHF
CI3
CI1
GND
3.5M
5M
7M
10M
14M
18M
24M
VHF
GND
GND
14V
14V
CO3
CO2
CO1
NVHF
CI3
CI2
CI1
GND
GND
CHASSIS W11
GND
3.5M
5M
7M
10M
14M
18M
24M
VHF
GND
GND
14V
14V
CO3
CO2
CO1
NVHF
CI3
CI2
CI1
GND
GND
CTRL-A UNIT
C107
7P
C108
5P
C61 0.0047
C60 0.0047
C59 0.0047
C58 0.0047
C57 0.0047
C56 0.0047
C55 0.0047
C54 0.0047
1
2
3
4
5
6
7
8
9
IN1
IN2
IN3
IN4
IN5
IN6
IN7
IN8
VS
O1
O2
O3
O4
O5
O6
O7
O8
GND
C18 0.0047
R26 1k
C9 0.0047
C10 0.0047
R27 1k
C11 0.0047
R28 1k
C12 0.0047
R29 1k
C13 0.0047
R30 1k
C14 0.0047
R31 1k
C15 0.0047
R32 1k
R219 1k
C16 0.0047
R25 1k
R33 1k
R47 1k
R45 1k
R44 1k
R42 1k
R43 1k
R46 1k
R41 1k
R37 1k
R38 1k
R39 1k
R40 1k
R36 1k
R35 1k
R34 1k
18
17
16
15
14
13
12
11
10
IC2
M54562P
1
2
3
4
5
6
7
3.5M
4.5M
4.6MDL
8
STROBE
DATA
CP
Q0
Q1
Q2
Q3
GND
VCC
OE
Q4
Q5
Q6
Q7
QS2
QS1
16
15
14
13
12
11
10
9
IC51
CD74HC4094M
C53 0.0047
C52 0.0047
C51 0.0047
C50 0.0047
C49 0.0047
C48 0.0047
C47 0.0047
5
4
C46 0.0047
6
7
8
3
2
O2
1
9
IN1
IN2
IN3
IN4
IN5
IN6
IN7
IN8
VS
O1
O3
O4
O5
O6
O7
O8
GND
C17 0.0047
R18 1k
R19 1k
C1 0.0047
C2 0.0047
C3 0.0047
R20 1k
C4 0.0047
R21 1k
C5 0.0047
R22 1k
C6 0.0047
R23 1k
C7 0.0047
R24 1k
C8 0.0047
11
12
13
14
15
16
17
18
R17 1k
10
IC1
M54562P
L2
EXC-ELDR25C
L1
EXC-ELDR25C
RL9
NY-12W-K
L12
LR-307
L11
LR-307
C33
0.0047
C32
0.0047
RL8
NY-12W-K
C62
0.0047
RL16
NY-12W-K
L10
LR-510
L9
LR-511
L8
LA-490
RL7
NY-12W-K
C31
0.0047
C30
0.0047
RL6
NY-12W-K
L7
LA-489
L6
LA-490
RL5
NY-12W-K
C29
0.0047
C28
0.0047
RL4
NY-12W-K
L5
LA-489
L4
LA-554
L303 100
µ
H
RL3
NY-12W-K
C27
0.0047
L3
LA-555
RL1
NY-12W-K
RL10
NY-12W-K
C40 100p
RL12
NY-12W-K
C38 150p
RL14
NY-12W-K
C36 82p
C41 100p
C34 39p
RL2
NY-12W-K
RL15
NY-12W-K
C37 100p
RL13
NY-12W-K
C39 150p
RL11
NY-12W-K
C43 100p
C35 39p
C42 100p
C25 0.0047
C24 0.0047
C23 0.0047
C44 150p
C45 150p
C26
0.0047
VHFT
MP9
24T
18T
14T
10T
7T
5T
35T
CI1
CI2
CI3
VHCI
VHCO
CO1
CO2
CO3
TUNER-A BOARD
J5
2 1
3 4
D241
DWA010
3 4
2 1
D25
DWA010
3 4
2 1
J4
IC1
SC-1415-1
A15
A14
A13
A12
A11
A10
A9
A8
NC
NC
WE
RESET
NC
NC
RY/BY
NC
A17
A7
A6
A5
A4
A3
A2
A1
A16
BYTE
VSS
DQ15/A-1
DQ7
DQ14
DQ6
DQ13
DQ5
DQ12
DQ4
VCC
DQ11
DQ3
DQ10
DQ2
DQ9
DQ1
DQ8
DQ0
OE
VSS
CE
A0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
22
23
24
25
26
27
28
1
2
3
4
5
6
7
21
20
19
18
17
16
15
14
13
12
11
10
9
8
OE
A11
A9
A8
A13
WE
VCC
A14
A12
A7
A6
A5
A4
A3
A10
CS
IO8
IO7
IO6
IO5
IO4
GND
IO3
IO2
IO1
A0
A1
A2
IC2
IDT71256SA15PZ
to MAIN-A
RESET
BYTE
BYTE
unit
J3503
to MAIN-A
unit
J3504
J1
J2
C1 0.1
C4 0.1
A16
A15
A14
A13
A12
A11
A10f
A9
A18
A8
A7
A6
A5
A4
A3
A2
A17
A1
A11
A9
A8
A13
A14
A12
A7
A6
A5
A4
A3
A10s
A0
A1
A2
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
A18
A17
A16
A15
A14
A13
A12
A11
A10s
A10f
C2
0.001
C3
10
D15
D7
D14
D6
D13
D5
D12
D4
D11
D3
D10
D2
D9
D1
D8
D0
R2
100k
R1
100k
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
D8
D9
D10
D11
D12
D13
D14
D15
MEMORY BOARD
14V
14V
REF
FOR
RD
HWR
RD
CSs
CSf
EP1
C228
270p
R156
1k
L301
LR-295
L302
LR-295
L14
L13
L16
L15
L18
L17
L20
BM27-
400-6A
BM27-
400-6A
BM27-
400-6A
BM27-
400-6A
BM27-
400-6A
BM27-
400-6A
BM27-
400-6A
BM27-
400-6A
L19
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
Each Frequency band
Selected 10.5V
0.03V
0.6V
4.6V
0.13V
1.75V
0.08V
MEASUREMENT CONDITIONS
VOLTMETER :50k
Ω
/VDC
SUPPLY VOLTAGE :13.8V
DISPLAY :14.1MHz/USB
MEASUREMENTCONDITIONS
VOLTMETER :50k
Ω
/VDC
OSCILLOSCOPE :20MHz
1M
Ω
25pF
SUPPLY VOLTAGE :13.8V
DISPLAY :14.1MHz
USB
TUNER :ON
756PROIII A3format.indd 44-45
2007/06/04 13:25:09