Icom IC-756proIII Service Manual page 103

A
B
D3201
1SV307
Display frequency(MHz) Line Voltage[V]
1.600000 1.999999 B1 11.0
J802
2.000000 2.999999 B2 11.0
B3 B3
C
3.000000 3.999999 B3 11.0
B5 B5
4.000000 5.999999 B4 11.0
B2 B2
6.000000 7.999999 B5 11.0
J801 B1
D3301
1SV307
J803
B1 B1
B4 B4
B2
D3401
1SV307
J805
D
E
B3
D3501
1SV307
B4
D3601
1SV307
MEASUREMENT CONDITIONS
: 50K Ω / VDC
VOLTMETER
SUPPLY VOLTAGE : 13.8V
DISPLAY : 14.1 MHz / USB
B5
BPF-A BOARD
F
D851
L852 C855
MA77 0.61µ 2.5p
C856
5p
R2301 100
G
POFF
H
PRE2
I
PRE1
J
K
T8V
L
R14V
M
14VL_2LOAMP
N
14VL_WEST
O
14VL_EAST
P
AGC
Q
R8V
R
ALC
S
8VL
T
5VL
U
BLBV
V
BLAV
W
X
RF-B UNIT
Y
L3202 C3206 D3202
1SV307
12µ 180p
L3205
C3210
C3207
12µ B1 J809
180p
27p
1.6-2.0
POFF
C3211
27p PREAMP_IN
R3202 100
L3302 C3306 C3310 L3305 D3302
5.6µ 330p 330p 5.6µ 1SV307
C3307 C3311
B2
56p 56p
2.0-3.0
R3302 100
L3402 C3406 C3410 L3405 D3402
82p 1SV307
6.8µ 82p 6.8µ
C3407 C3411
B3
15p 15p
3.0-4.0
J804
GND
PRE1
PRE2
14VL
R8V
R3402 100
L3502 C3506 C3510 L3505 D3502
3.3µ 120p 3.3µ 1SV307
120p
C3507 C3511
B4
27p 27p
4.0-6.0
J807
R3502 100
PRE1_W
C3606 D3602
L3602 C3610 L3605
2.7µ 39p 39p 2.7µ 1SV307
C3607 C3611
B5
33p 33p
6.0-8.0
R3602 100
PREAMP BOARD
PREAMP_IN
C858 L854 D852
0.61µ MA77
5p
L1701
LS-484B
C971
C859
TXB10
2.5p 0.1
50-54
C952
220p
R952
56k
PREAMP_OUT
D4101 1SV307 C4102 0.1
PREAMP_OUT
D4102
1SV307
L4101
150µ
C4217 68p C4101 0.1
L4205
LR-440
C4211
0.1
C4218 68p
Q4201 L4208 C4215
2SC5551 LR-439
0.1
C4201
0.1
L4202
LR-439
PREAMP1 ON: 7.2V
Other: 0V
L4206 LR-440
L4207
100µ
Q4202
2SC5551
R4207
R4205 1k 2.7k
C4208 0.1
PREAMP1 ON: 10.2V
Other: 0V
PRE1_W
Q4203 Q4204
XP4311 XP4311
11.0V
4 3 4 3
5 2 5 2
RX: 7.4V
TX: 0V
6 1 6 1
PREAMP_OUT
C4306 0.1
Q4302
C4302 R4309 2SC5551
D4302
0.1 0
1SV307
L4302 L4303
R4304
LR-500 LR-489
8.2
PREAMP2 ON: 7.2V
Other: 0V L4304
100µ
14VL
Q4303
Q4301 XP4311 XP4311
R8V 4 3 4 3
MEASUREMENT CONDITIONS
VOLTMETER : 50K Ω / VDC
5 2 5 2
SUPPLY VOLTAGE : 13.8V
DISPLAY : 14.1 MHz / USB
6 1 6 1
PRE2
PREAMP2 ON: 10.7V
Other: 0V
FI1701
D1851
FL-381
MA77
5
C1705
1 4
L1702
IN GND
0.01
3 2 LS-484B
C1753 R1752
GND OUT
L1751
0.0047 10
LS-484B
D1751 C1751
6
MA77 0.1
C1703
8p
MKR
D951
1SV307
T8V
R14V
14VL_2LOAMP
MKR
14VL_EAST
AGC
R8V
ALC
8VL
5VL
BLBV
BLAV
Q1001
C901 L1001 L1002 L1003 C1011
2SK1740
0.1 45.3n 97n 135n 0.1
L902
C1002 C1006 C1009
LR-395
120p 47p 15p
Q1002
2SK1740
L903
LR-395
RX: 10.6V
TX: 11.0V
Q1201
L1207
L1201 L1202 L1203 C1211 C1212
2SK1740
45.3 135n 0.1 15p LR-501
97n
C1202 C1206 C1209
47p 15p
120p
Q1202
L1205
2SK1740
0.33µ
14VA
1.15V
R1406 C1403
EP1406
10 0.1
6
D1401 R1402 C1404 L1402 L1403
1SV307
39 0.1 0.15µ 82n
4 1
C1402 5
C1408
C1406
0.1 3
2 18p 68p
IC1401
µPC2708TB
T8V
D1852
L1851 L1852
R1852 C1852 C1856 R1858
HSB88WS
6.8 LR-358 LR-395
0.1 0.1 15
C1854 R1861
0.1 270
R1855 R1862
680 270
T8V
C1761 L1756 R1767 C1763 D1801
1.5µ 1SV307
300p 0 0.1
2IF
D1752
L1753 L1754
HSB88WS
LR-395 LR-358
C1759 0.1 R1762 270
R1761 R1763
820 270
D1753
Explanatory notes
MA77
L1752
Q1751 VOLTAGE LINE
LS-484B
3SK131
TX LINE
RX LINE
COMMON LINE
8VS
8
IC2002
V+
NJM4558M
GND
4
C2011
0.1
MKR
L2002 100µ
10 - 18
A
C1012
15p
B
L1005
0.33µ
C
D
E
F
8VS
G
H
T8V
I
R14V
J
14VL_2LOAMP
K
MKR
L
14VL_EAST
M
R8V
N
ALC
O
8VL
P
5VL
Q
BLBV
R
BLAV
S
T
U