![background image](http://html.mh-extra.com/html/icom/ic-756proiii/ic-756proiii_service-manual_612301102.webp)
10 - 17
VOLTAGE LINE
Explanatory notes
TX LINE
RX LINE
COMMON LINE
BPF_POR
T2
0.03-1.6
B0
0
R752
0
R753
50-54
B10
54-60
30-50
B10W
22-30
B9
15-22
B8
11-15
B7
8-11
B6
560p
C807
14VL_WEST
2SC4081
Q103
PAI
R8V
POFF
PRE2
PRE1
POFF
PRE2
PRE1
14VL_WEST
14VL_WEST
14VL_WEST
RX
5VL
8VL
T8V
TXB10
B10
B10W
B9
B8
B7
B6
B0
B7
B8
B9
B10W
B10
TXB10
A
TT1
A
TT2
B0
B1
B2
B3
B4
B5
B6
D301 DAN222
DAN222
D302
DAN222
D303
DAP222
D354
DAP222
D353
5VL
T8V
BLAV
BLBV
5VL
8VL
ALC
R8V
AGC
14VL_EAST
14VL_WEST
14VL_2LOAMP
R14V
T8V
BSTB
MDAT
MCK
E3_4
E3_3
E3_2
E2_7
E2_6
E2_4
E2_3
E2_2
E1_8
E1_7
E1_6
E1_4
E1_3
E1_2
E1_1
E1_1
E3_4
E3_3
B10
TXB10
E2_7
E2_2
E2_1
E2_4
E2_3
E2_5
E2_6
B10
TXB10
E3_1
E3_2
E1_1
E1_2
E1_3
E1_4
E1_5
E1_7
E1_6
E1_8
R352 4.7k
R351 4.7k
DAN222
D352
DAN222
D351
R8V
T8V
ALC
8VL
AGC
14VL_EAST
14VL_WEST
-5V
5VL
TRVI
BLBV
BLAV
SATV
SCPL
MDAT
MCK
BSTB
MA742
D101
R8V
1
2
3
4
8
7
6
5
UNR9211J
Q152
8VL
TRVI
14VL_WEST
100k
R213
14VL_WEST
R14V
TRVI
TRVI
TRVI
E3_5
0
R353
RANS
ATT1
ATT2
100
R113
39
R110
ATN203
RL103
ATN203
RL102
UNR9211J
Q101
DAN222
D103
ATN203
RL101
J201
unit J1
from PA
unit J2
from CTRL-A
J101
0
R362
0
R361
0
R360
0.0047
C9020
0.0047
C9011
0.0047
C9027
0.0047
C9026
0.0047
C9018
0.0047
C9016
0.0047
C9008
0.0047
C9007
0.0047
C9024
0.0047
C9015
0.0047
C9002
0.0047
C9021
0.0047
C9012
0.0047
C9001
8p
C757
1SV307
D802
0.0012
C806
0.0027
C805
4.7
µ
L802
4.7
µ
L801
0.1
C802
100
R803
100
R801
0.1
C801
68
R802
1SV307
D801
100
µ
L401
D604 1SV307
D601 1SV307
R354 10k
10k
R357
XP4311
Q355
3
2
4
1
6
5
XP4311
Q354
3
2
4
1
6
5
XP4311
Q353
3
2
4
1
6
5
C403 0.1
C402 0.1
C401 0.1
E3_1
E3_5
QS
GND
8
7
6
5
4
3
2
CD4094BPWR
IC403
1
9
10
11
12
13
14
15
16
Q'S
Q8
Q7
Q6
Q5
Q1
STR
D
CLK
Q2
Q3
V+
Q4
OE
E2_1
E2_5
QS
GND
8
7
6
5
4
3
2
CD4094BPWR
IC402
1
9
10
11
12
13
14
15
16
Q'S
Q8
Q7
Q6
Q5
Q1
STR
D
CLK
Q2
Q3
V+
Q4
OE
E1_5
QS
GND
8
7
6
5
4
3
2
CD4094BPWR
IC401
1
9
10
11
12
13
14
15
16
Q'S
Q8
Q7
Q6
Q5
Q1
STR
D
CLK
Q2
Q3
V+
Q4
OE
UMH11N
Q351
3
2
4
1
6
5
UMH11N
Q352
3
2
4
1
6
5
R358 10k
R359 10k
XP4311
Q357
3
2
4
1
6
5
XP4311
Q356
3
2
4
1
6
5
R326 10
C302 0.1
R315 10
R319 10
R318 10
R316 10
R325 10k
R324 10k
R323 10k
R322 10k
R321 10k
R317 10
R320 10k
9
8
7
6
5
4
3
2
TD62783AF
IC302
1
10
11
12
13
14
15
16
17
18
GND
O8
O7
O6
O5
O4
O3
I4
I1
I2
I3
I5
I6
O1
VCC
I8
I7
O2
C301 0.1
R301 10
R302 10
R303 10
R304 10
R305 10
R306 10
R307 10
R314 10k
R313 10k
R312 10k
R311 10k
R310 10k
R309 10k
R308 10k
TD62783AF
IC301
9
8
7
6
5
4
3
2
1
10
11
12
13
14
15
16
17
18
GND
O8
O7
O6
O5
O4
O3
O2
O1
VCC
I8
I7
I6
I5
I4
I3
I2
I1
R751 100
1SV307
D752
C765 0.1
L754 0.14
µ
47p
C760
L753 95n
47p
C756
0.1
C752
1SV307
D751
L751 0.14
µ
R701 100
R651 100
R601 100
R551 100
R501 100
68p
C704
1SV307
D702
C707 0.1
C706 56p
L703 0.27
µ
0.22
µ
L702
0.1
C702
1SV307
D701
L701 0.27
µ
C701 56p
1SV307
D652
0.68
µ
L655
15p
C666
C665 0.1
C664 100p
L654 0.33
µ
C662 22p
C663 12p
22p
C660
C659 7p
C658 22p
L653 0.68
µ
22p
C656
0.68
µ
L652
C655 12p
C654 22p
0.1
C652
1SV307
D651
C653 15p
L651 0.33
µ
C651 100p
1SV307
D603
0.82
µ
L605
120p
C616
C615 0.1
C614 18p
L604 0.56
µ
C612 18p
C613 33p
33p
C610
10p
C611
C609 47p
L603 0.82
µ
10p
C607
33p
C606
0.82
µ
L602
C605 33p
C604 18p
0.1
C602
1SV307
D602
C603 120p
L601 0.56
µ
C601 18p
1SV307
D552
1.5
µ
L555
47p
C566
C565 0.1
C564 180p
L554 0.68
µ
C562 18p
C563 47p
22p
C560
15p
C561
C559 47p
C558 8p
L553 1.5
µ
15p
C557
22p
C556
1.5
µ
L552
C555 47p
C554 18p
0.1
C552
1SV307
D551
C553 47p
L551 0.68
µ
C551 180p
1SV307
D502
C515 0.1
1.8
µ
L505
68p
C516
C514 220p
L504 1
µ
C513 47p
C512 47p
33p
C511
33p
C510
C509 47p
C508 47p
L503 1.8
µ
33p
C506
33p
C507
1.8
µ
L502
C505 47p
C504 47p
1SV307
D501
0.1
C502
L501 1
µ
C503 68p
C501 220p
1SV307
D104
C484 100p
C483 0.001
C482 0.001
C481 0.001
C480 0.1
C479 0.1
C478 0.1
C477 0.001
C476 100p
C475 0.1
C474 100p
C486 0.1
C485 0.1
C473 0.0047
EP461
2.7
µ
L456
C1901 0.1
0.1
C207
R208 10k
XP4311
Q1901
3
2
4
1
6
5
0.1
C252
UNR9211J
Q203
180
R212
0.1
C209
330
R211
330
R209
1SV307
D201
15
R210
0.1
C208
µ
PC1678GV
IC201
IN
GND
GND
GND
VCC
GND
GND
2SA1576
Q201
47k
R204
1k
R205
4.7
R207
C206 0.1
L203 22
µ
82p
C204
82p
C202
12p
C203
0.1
C205
0.12
µ
L202
10
R202
0.61
µ
L201
10p
C201
R203 470
R201 470
0.1
C112
5.6
µ
L253
4.7
µ
L271
0.0033
C273
0.0015
C274
0.0033
C272
0.1
C251
100k
R251
C271 0.0027
330
µ
L252
330
µ
L251
100k
R108
0.1
C111
330
R107
330
µ
L104
10k
R109
0.1
C153
2.2k
R155
0.1
C110
68n
L103
UMH11N
Q102
6
5
1
4
3
2
OUT
UMH11N
Q202
6
5
1
4
3
2
R151 10k
1SV307
D152
100k
R157
0.1
C155
330
µ
L151
330
R156
1SV307
D151
R154 100k
0.1
C152
0.1
C151
0.1
C154
UMH11N
Q151
6
5
1
4
3
2
R153 10k
2P-50
R152
22p
C109
C108 2p
0.1
C106
33p
C105
82p
C103
82n
L102
0.12
µ
L101
75p
C104
15p
C102
C101 47p
R102 10k
100k
R104
330p
C113
0
R105
2.2k
R103
R114 82
C115 0.0047
R112 82
-
+
R111 150
C114 0.0047
R106 150
-
+
C107 0.0047
C117 0.0047
-
+
EP460
EP459
EP458
EP457
EP456
EP455
EP454
EP462
EP473
EP463
EP464
EP453
EP472
EP471
EP470
EP469
EP452
EP468
EP465
EP466
EP467
EP451
C458 470
R452 1
R451 1
C464 0.1
C463 0.1
C462 0.001
C461 100p
C460 100p
C471 100p
C470 100p
C469 100p
C468 0.001
C467 0.001
C466 0.001
C465 0.001
C451 0.0047
C457 10
C456 0.1
C455 10
C454 0.1
C453 10
C452 0.1
CP472
CP471
CP470
CP469
CP468
CP467
CP466
CP465
CP464
CP463
CP462
CP461
CP460
CP459
CP458
CP457
CP456
CP455
CP454
CP453
CP452
CP451
NC
NC
NC
NC
unit J811
to MAIN-A
BSTB
MCK
MDAT
GND
SCPL
BLAV
BLBV
SATV
TRVI
5V
-5V
R8V
T8V
ALC
8V
AGC
14V
14V
J451
XP4311
Q104
4
5
3
6
1
2
2P-50
R101
XVRT
RANT
J102
A
B
C
D
E
G
F
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
BLAV
BLBV
5VL
8VL
ALC
R8V
AGC
14VL_EAST
14VL_WEST
14VL_2LOAMP
R14V
T8V
Display frequency(MHz)
0.003000 1.599999
1.600000 1.999999
2.000000 2.999999
3.000000 3.999999
4.000000 5.999999
Filter
B0
B1
B2
B3
B4
6.000000 7.999999
8.000000 10.999999
11.000000 14.999999
15.000000 21.999999
22.000000 29.999999
30.000000 49.999999
B5
B6
B7
B8
B9
50.000000 54.000000
54.000001 60.000000
50.000000 54.000000
B10
B10W
B10W
TXB10
ATT OFF, 6dB: 0V
Selected: 10.8V
ATT12, 18dB: 9.8V
PREAMP2 ON: 11.2V
Other: 0V
PREAMP1 ON: 11.2V
Other: 0V
ATT OFF, 6dB: 9.9V
ATT12, 18dB: 0V
MEASUREMENT CONDITIONS
VOLTMETER
: 50K
Ω
/ VDC
OSCILLOSCOPE
DISPLAY
: 14.1 MHz USB
: 20MHz 1M
Ω
25pF
RF-B UNIT
756PROIII A3format.indd 68-69
2007/06/04 13:25:11