![background image](http://html.mh-extra.com/html/icom/ic-756pro-iii/ic-756pro-iii_service-manual_612292094.webp)
VOLTAGE LINE
Explanatory notes
RX LINE
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
Q
P
R
S
T
U
V
W
3LO
RXF
14V
RXF
ETE
ET14
ETST
ETKY
SPE
SSP
J662
J661
CP671
J681
33k
R636
33k
R632
M5V
M5V_
CS1_
CS2_
M5V_
CS2_
M5V
P352
4.7k
R638
4.7k
R634
EP634
EP632
EP861
EP702
EP701
EP682
EP681
EP631
EP633
EP658
MA2S111
D632
47k
R3732
47k
R3704
1k
R3727
SBSY
SSTB
0.0047
C681
100
µ
H
L681
SKYS
CP681
CP682
(KEY)
(CI-V)
W701
100p
C701
EXC-ELDR25C
L723
EXC-ELDR25C
L722
CIVE
CIV
unit J701
from PLL
J211
3LO
2SD1619
Q652
DTA114EE
Q651
TRAS
330
R651
10k
R652
0.0047
C651
0.0047
C653
MA2S111
D631
0.0047
C631
SENI
2SC4081
Q631
15k
R633
EP703
4.7k
R631
0.0047
C632
2SC4081
Q632
RTKI
15k
R637
4.7k
R635
AMOD
SQSS
UNR9211J
Q653
8.2k
R653
AAFO
BANS
EALC
MSND
TRV
0.0047
C665
0.0047
C662
0.0047
C661
0.0047
C667
0.0047
C652
0.0047
C669
0.0047
C668
0.0047
C664
0.0047
C663
0.0047
C666
0.0047
C670
L665 100
µ
H
L662 100
µ
H
L661 100
µ
H
L667 100
µ
H
L669 HF50ACC322513-B
L631 HF50ACC322513-B
HF50ACC322513-B
L659
HF50ACC322513-B
L658
L668 100
µ
H
L664 100
µ
H
L663 HF50ACC322513-B
HF50ACC322513-B
L666
L670 100
µ
H
CP665
CP662
CP661
CP667
CP669
CP668
CP670
CP663
CP664
CP666
8
ACC (1)
6
1
4
2
5
3
7
ACC (2)
7
3
5
2
4
1
6
UNR9211J
Q691
0.0047
C692
0.0047
C695
D
AN222
D691
10
R691
0.0047
C691
OMR-109F
RL691
J691
CP692
CP693
CP353
CP691
(ALC (EXT))
CP354
CP351
2943-666663
L352
HF50ACC322513-B
L354
HF50ACC
322513-B
L692
HF50ACC
322513-B
L691
EP692
EP691
HF50ACC322513-B
L353
2943-666663
L351
CP352
W354
J352
0.0047
C353
SP
START
KEY
J351
(SEND (RL))
0.0047
C641
0.0047
C642
0.0047
C643
0.0047
C354
L644 HF70ACC635050-T
L643 HF70ACC635050-T
L642 220
µ
H
L641 220
µ
H
CP644
CP643
CP642
CP641
TUNER
TO
J641
CP702
CP701
J701
8V
14V
ESTA
EKEY
TCON
RTDT_
CTFL_
DSFR
DSFW
DPGI_
DSKY_
DSDR
KEY
START
1k
R3706
0.01
C3712
0.01
C3711
UNR9211J
Q3701
1k
R3707
1M
R3705
DA
P
22
2
D3702
D
AN222
D3701
47k
R3701
47k
R3702
47k
R3703
C3702 0.0047
C3704 0.0047
C3705 0.0047
C3706 0.0047
C3707 0.0047
C3708 0.0047
C3709 0.0047
R3712 1k
R3711 1k
R3710 1k
R3709 1k
DPGI
RTDT
CTFL
DSKY
DSFR
DSDR
DSFW
SPCH
MCK
CP3006
CP3002
CP3004
CP3008
MDAT
47k
R3728
0.0047
C3724
0.1
C3774
CP3001
CP3003
CP3005
8
6
4
2
7
5
3
1
CP3007
J3502
W3730
VDTI
VINT
VRAC
VDTI
VINT
VRAC
SQLS
AFMS
SPS
UNSB
47k
R3722
47k
R3721
0.1
C3725
15k
R3723
SQLS_
1k
R3724
0.0047
C3722
0.0047
C3721
AFMS_
1k
R3726
0.0047
C3723
47k
R3725
SPS_
14V
8V
M5V_
H5V_
0.01
C3656
2p
C3655
1k
R3654
HWR_
CSL
2
3
TC74AC32FT
IC3656
4
5
6
7
9
8
10
11
12
13
14
1
RD_
LWR_
HWR_
0.01
C3654
14
13
12
11
10
9
8
7
6
5
4
3
2
1
TC74AC08FT
IC3655
LRES
CS1
CS2
CS0
CS3
FAI_
RD_
LWR_
HWR_
SQSS
SPS_
SSTB
VCS
ESTA
DSFR
DSFW
R3653 220k
R3652 220k
R3657 220k
R3658 220k
0.01
C3651
100k
R3651
CSf_
FAI
CSs_
RD
LWR
HWR
BSON
B1
YA4
B2
YA3
B3
YA2
B4
YA1
ENB
VDD
VSS
YB1
A4
YB2
A3
YB3
A2
YB4
A1
ENA
TC74AC244FT
IC3651
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
CLK
Q7
Q6
Q5
Q4
Q3
Q2
Q1
Q0
VCC
GND
D7
D6
D5
D4
OUT EN
D0
D3
D1
D2
DB15
DB14
DB13
DB12
DB11
DB10
DB9
DB8
DTA114EE
Q3551
0.01
C3653
TC74AC574FT
IC3654
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
1
2
0.01
C3652
BSTB
ANTS
FSTB
ASTB
MSTB
AFMS_
SQLS_
DB7
DB6
DB5
DB4
DB3
DB2
DB1
DB0
R3786 100k
CLK
Q7
Q6
Q5
Q4
Q3
Q2
Q1
Q0
VCC
GND
D7
D6
D5
D4
D3
D2
D1
D0
OUT EN
TC74AC574FT
IC3653
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
1
2
CTFL_
RTDT_
EKEY
TCON
VDTI
VINT
VRAC
SBSY
0.01
C3657
DB8
DB9
DB10
DB11
DB12
DB13
DB14
DB15
VCC
G
B1
B2
B3
B4
B5
B6
B7
B8
GND
A8
A7
A6
A5
A4
A3
A2
A1
DIR1
TC74AC245FT
IC3652
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
7
5
6
47
R3744
NJM4558M
IC321B
–
+
XP4311
Q3751
6
5
4
1
2
3
CSf
CSa
RD
HWR
DB15
DB14
DB13
DB12
DB11
DB10
DB9
DB8
DB0
DB1
DB2
DB3
DB4
DB5
DB6
DB7
J3504
0.0047
C3658
100p
C3659
RX 0V
TX 4.5V
RX 6.5V
TX 0V
MAIN-A UNIT (2)
10 - 11
756PROIII A3format.indd 56-57
2007/06/04 13:25:10