Icom IC-756PROIII Service Manual page 115

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
B5 11.0
6.000000 7.999999
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
C3206 D3202
L3202
12µ 180p 1SV307
L3205
C3210
C3207
180p 12µ B1 J809
27p
1.6-2.0
C3211
27p
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
6.8µ 82p 82p 6.8µ 1SV307
C3407 C3411
B3
15p 15p
3.0-4.0
J804
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
L3602 C3606 L3605 D3602
C3610
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
5p 0.61µ MA77
C859 C971
TXB10
2.5p 0.1
50-54
C952
220p
R952
56k
D4101 1SV307 C4102 0.1
D4102
1SV307
L4101
150µ
POFF
C4217 68p C4101 0.1
L4205
PREAMP_IN LR-440
C4211
0.1
C4218 68p Q4201 L4208
2SC5551 LR-439
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
GND PRE1_W
PRE1
PRE2
14VL
Q4203
R8V XP4311
11.0V
4 3
5 2
RX: 7.4V
TX: 0V
6 1
PREAMP_OUT
C4306 0.1
Q4302
C4302 2SC5551
R4309
0.1 0
L4302
R4304
LR-500
8.2
PRE1_W
PREAMP2 ON: 7.2V
Other: 0V L4304
100µ
14VL
Q4303
Q4301 XP4311 XP4311
R8V 4 3 4
MEASUREMENT CONDITIONS
: 50K Ω / VDC
VOLTMETER
5 2 5
SUPPLY VOLTAGE : 13.8V
DISPLAY : 14.1 MHz / USB
6 1 6
PRE2
FI1701
D1851
FL-381
MA77
L1701 5
C1705
LS-484B 1 4
L1702
IN GND 0.01
3 2 LS-484B
GND OUT
L1751
LS-484B
D1751 C1751
6
MA77 0.1
C1703
8p
MKR
D951
1SV307
PREAMP_OUT
C901 L1001 L1002
0.1 50n 107n
PREAMP_OUT
L902
LR-395 C1002 C1006
47p
120p
L903
LR-395
C4215
0.1
L1201 L1203 C1211
L1202
50n 107n 0.25-1.9 0.1
C1202 C1206 C1209
120p 47p 15p
EP1406 R1406
10
6
D1401 R1402
1SV307 39
4
C1402
5
3
0.1
2
IC1401
µPC2708TB
T8V
D1852
Q4204
L1851
R1852 C1852
XP4311 HSB88WS
LR-358
6.8 0.1
4 3
5 2
6 1
C1854
0.1
R1855
D4302
680
1SV307
L4303
T8V
LR-489
C1761 L1756 R1767 C1763
300p 1.5µ 0 0.1
D1752
L1753 L1754
HSB88WS
LR-395 LR-358
3
2
1
C1759 0.1 R1762 270
PREAMP2 ON: 10.7V
R1761 R1763
Other: 0V
820 270
D1753
MA77
L1752
Q1751
LS-484B
3SK131
C1753 R1752
0.0047 10
8VS
8
IC2002
V+
NJM4558M
GND
4
C2011
0.1
T8V
R14V
14VL_2LOAMP
MKR
14VL_EAST
AGC
R8V
ALC
8VL
5VL L2002
BLBV
BLAV
10 - 18
A
Q1001
L1003 C1011 C1012
2SK1740
0.1
0.25-1.9 15p
B
C1009
15p
Q1002
L1005
2SK1740
0.33µ
RX: 10.6V
Q1201 TX: 11.0V
C1212 L1207
2SK1740
LR-501
15p
C
D
Q1202
L1205
2SK1740
0.33µ
14VA
E
1.15V
C1403
0.1
C1404 L1402 L1403
0.1 0.15µ 82n
1
F
C1406 C1408
18p 68p
L1852
C1856 R1858
LR-395
0.1 15
R1861
270
R1862
270
D1801
1SV307
2IF
Explanatory notes
VOLTAGE LINE
TX LINE
RX LINE
COMMON LINE
8VS
G
H
T8V
I
R14V
J
14VL_2LOAMP
K
MKR MKR
L
14VL_EAST
M
R8V
N
ALC
O
8VL
P
100µ 5VL
Q
BLBV
R
BLAV
S
T
U