Icom IC-756PRO III Service Manual page 94

A
MAIN-A UNIT (2)
M5V
B
C
14V
D
8V
E
M5V_
F
H5V_
G
H
RXF
I
J
K
L
M
N
O
J3504
DB7
DB6
DB5
Explanatory notes
DB4
DB3
VOLTAGE LINE
DB2
RX LINE DB1
DB0
HWR
RD
CSa
CSf
P
Q
R
Q3551
DTA114EE
S
T
IC3655
TC74AC08FT
HWR_ 1
LWR_ 2
3
4
RD_ 5
6
7
U
IC3656
TC74AC32FT
1
2
CSL 3
4
HWR_ 5
6
7
V
W
M5V_
IC3652
TC74AC245FT
1 20
DIR1 VCC
DB15 2 19
A1 G
DB14 3 18
A2 B1
DB13 4 17
A3 B2
DB8 DB12 5 16
A4 B3
DB9 DB11 6 15
A5 B4
DB10 DB10 7 14
A6 B5
DB11 DB9 8 13
A7 B6
DB12 DB8 9 12
A8 B7
DB13 10 11
GND B8
DB14
DB15
IC3653
TC74AC574FT
LRES
1 20
OUT EN VCC
DB0 2 19
D0 Q0
DB1 3 18
D1 Q1
DB2 4 17
D2 Q2
DB3 5 16
D3 Q3
DB4 6 15
D4 Q4
DB5 7 14
D5 Q5
DB6 8 13
D6 Q6
DB7 9 12
D7 Q7
10 11
GND CLK
Q3751
XP4311
4 IC3654
TC74AC574FT
5 3
1 20
OUT EN VCC
DB8 2 19
6 2 D0 Q0
DB9 3 18
D1 Q1
1 DB10 4 17
D2 Q2
DB11 5 16
D3 Q3
DB12 6 15
D4 Q4
R3744
DB13 7 14
6 47 D5 Q5
– 7 DB14 8 13
5 D6 Q6
+ DB15 9 12
D7 Q7
IC321B 10 11
GND CLK
NJM4558M
IC3651
14 TC74AC244FT
BSON 1 20
ENA VDD
13 HWR 2 19
A1 ENB
CS2_ 3 18
YB4 YA1
12 LWR 4 17
A2 B4
CS1_ 5 16
YB3 YA2
11 RD 6 15
A3 B3
CSs_ 7 14
YB2 YA3
10 FAI 8 13
A4 B2
CSf_ 9 12
YB1 YA4
9 10 11
VSS B1
8
DSDR
DSKY_
CS2_
DPGI_
14
13
12
11
10
9 MCK
8
J3502
MDAT 1 2
3 4
5 6
7 8
10 - 11
M5V
14V
8V
R3723
15k
SQLS_
SBSY SQLS
VRAC
VINT
VDTI
TCON
R3724
EKEY
1k
RTDT_ AFMS_ AFMS
CTFL_
R3726
1k
SPS_
SPS
SQLS_
AFMS_
MSTB
ASTB
FSTB
ANTS
BSTB
UNSB
DSFW
DSFR
ESTA
VCS
SSTB
SPS_
SQSS
VRAC VRAC
VINT VINT
VDTI VDTI
HWR_
LWR_
RD_
FAI_
DSFW DSFW
DSDR
DSFR DSFR
R3709 1k DSKY
CTFL_ R3710 1k CTFL
RTDT_
R3711 1k RTDT
R3712 1k DPGI
SBSY
R3706
1k
TCON START
EKEY KEY
R3707
1k
SSTB Q3701
ESTA UNR9211J
SPCH
14V
KEY
START
RXF
L351
2943-666663
SP
L352
RX 6.5V
2943-666663
TX 0V
RX 0V
TX 4.5V
R631 D631
4.7k MA2S111
R634
4.7k
EP634
SENI
Q631
R691
2SC4081
10
Q652 Q691
R651
2SD1619 UNR9211J
EP632 330
TRAS
Q651
DTA114EE
L670 100µH
TRV
L666
HF50ACC322513-B
L631 HF50ACC322513-B
L663 HF50ACC322513-B
MSND
EP658 L664 100µH
EALC
L668 100µH
BANS
Q653
L669 HF50ACC322513-B
UNR9211J
EP861
SQSS
L667 100µH
L661 100µH
AAFO
EP631 L662 100µH
AMOD
R635 D632 L665 100µH
R638
4.7k MA2S111
4.7k
EP633
RTKI
Q632
2SC4081
3LO
L722
EXC-ELDR25C
CIV
L723
EXC-ELDR25C
CIVE
L681
100µH
SKYS
J641
L641 220µH ETKY
L642 220µH ETST
TO
L643 HF70ACC635050-T ET14
TUNER
L644 HF70ACC635050-T ETE
L353
HF50ACC322513-B
J351
L354
HF50ACC322513-B
P352
J352
SSP
SPE
RL691 L692
HF50ACC
OMR-109F
322513-B
J691
(SEND (RL))
L691
EP692
HF50ACC
322513-B
EP691 (ALC (EXT))
ACC (2)
J662
7 6
3 1
5 4
CP671
2
L658
HF50ACC322513-B
ACC (1)
J661
7 6
3 8 1
5 4
2
L659
HF50ACC322513-B
J211
3LO from PLL
unit J701
EP702
J701
(CI-V)
EP701
J681
EP682
(KEY)
EP681