Rf Unit - Icom IC-756PRO Service Manual

10-8 RF UNIT

D131
C131
1SV265
0.1
2 3
RL121 RL122 4
R122 R124
AHY103 AHY103 1 5
100 68
L132 L131
4.7uH 330uH
R121 R123
J101 47 150
RX
from CTRL
unit J2
DS111
HRS-4160A
L112 L111 C111
0.12uH 82nH 0.1
C171
D101 D102
C115 C113 0.0027
1SS302 1SS302
15p 75p
L174
RL101 4.7uH
AHY103
J111
RANT
D141
C145 C141
1SV265
0.1 0.1
2 3
Q141 Q143 4
XVRT
UMH11N DTC114EE L141 1 5
330uH R133
1 6
10k
2 5
3 4
14VL
8VL
TRVI
R146
10k Q132
IC151 DTC114EE
R162 L152 C154 C152 R152
uPC1678G
J151 10 0.12uH 0.1 0.1 15
from PA PAI 5 4
OUT GND
unit J1 6 3
GND GND
C156
7 2
12p GND GND
8 1
VCC IN
Q151
PREAMP1 ON 13.2V UMH11N
OTHER 0V 1 6
D151
MA2S111
Q152 2 5
2SA1576 R160
1k
3 4
Q905 Q904
UMC3N UMC3N
4 3 4 3
D152
MA2S111
2 2 Q153 T8V
DTC114EE
5VL
5 1 5 1 TRVI
PRE1
D902
PREAMP2 ON 13.2V DAN222 PRE2
OTHER 0V 14VL
Q901 Q902 Q903
UMH11N UMH11N UMC3N
D901
4 3 4 3 4 3
DAN222
5 2 5 2 2
6 1 6 1 5 1
R934
10k
CP972 CP971 CP970 CP969 CP968 CP967 CP966 CP965 CP964 CP963 CP962
J951
14V
14V
AGC
8V
ALC
T8V
R8V
-5V
from MAIN
5V L951 HF50ACC322513-B
unit J811
TRVI
RANS
SATV
BLBV
BLAV
SCPL
GND
MDAT
MCK
BSTB
CP954 CP961 CP960 CP959 CP958 CP957 CP956 CP955 CP953 CP952 CP951
RF UNIT
Selected 12.0V
Q131
IC903 Unselected 0V
DTC114EE
TD62783AF
16
9 10
VS GND
BSTB 1 4 8 11
R913 10
STR Q1 IN8 O8
MDAT 2 5 7 12 R914 10
D Q2 IN7 O7
MCK 3 6 6 13
CLK Q3 IN6 O6 R915 10
15 7 5 14 R916 10
DE Q4 IN5 O5
14 4 15 R917 10
Q5 IN5 O4
13 3 16 R918 10
Q6 IN3 O3
12 2 17 R919 10
Q7 IN2 O2
11 1 18
R920 10
Q8 IN1 O1
C173 9
IC901
0.0015 QS
BU4094BCF 10
QS
L171
330uH 8
c
5VL
IC904
16
ATT2 TD62783AF
ATT1 BSTB 1 4 1 18 R927 10
STR Q1 IN1 O1
RANV 2 5 2 17 R928 10
D Q2 IN2 O2
MCK 3 6 3 16 R929 10
CLK Q3 IN3 O3
15 7 4 15 R930 10
DE Q4 IN4 O4
14 5 14
Q5 IN5 O5
13 6 13
Q6 IN6 O6
12 7 12
Q7 IN7 O7
11 8 11
Q8 IN8 O8
9 10
VS GND
IC902 9
QS
BU4094BCFV 10
QS
ATT 0.6dB 12.0V
ATT 12.18dB 0V
8
ATT 0.12dB 12.0V
ATT 6.18dB 0V
14VL
D291 D292
D391 L393 C396 C398 D392 1SV265 L352 L353 C356 C358 MA862
1SV263 W392 0.15uH 82p 82p MA77 0.33uH 0.27uH 180p 100p
2 3 3 2
R155
4
100k
C394 C352 C354
1 5 4 1
18p 8p 27p
B10W B9
D371 L372 L373 L374 C377 C379 D372 L292 L293 C295 C297
1SV263 0.14uH 0.14uH 0.14uH 68p 47p MA77 1.2uH 1uH 560p 330p
C373 C375 C293
30p 18p 47p
B10 B6
D331 L332 L333 C335 C337 D332 D311 L312 L313 C315 C317 D312
1SV263 0.33uH 0.39uH 300p 150p MA77 1SV263 0.39uH 0.56uH 470p 240p MA77
C333 C313
30p 47p
B8 B7
PRE1 PRE1
PRE2 PRE2
POFF POFF
14VL 14VL
AGC AGC
8VL 8VL
ALC ALC
R8V R8V
T8V T8V
5VL 5VL
RANS
R883
150k
CP871 R874 390k
R884 R873
R876
maker ON 470k 100k
13 9 1k 6
scope activate 14 - 8 - 7 -
MDAT 12 10 5
scope ATT 0dB
+ IC871c + +
MCK
NJM2058M IC871b
BSTB
NJM2058M
IC871d
3.8V
NJM2058M R881
150k
SCPL
-5V -5VS
L873 100uH
5VL L871 100uH 5VS
SATV SATV
8VL L872 100uH 8VS
BLBV BLBV
BLAV BLAV
L182 L183 C185 R182
4.7uH 6.8uH 0.1 68
C183
390p C411 D431 C432
L431 Q441
0.1 MA77 0.1
150uH 2SK2171 11.7V
D441
1.0V
B0 MA862 L441
LR-86
B1 1 4
Q442
B2
2SK2171
B3 2 3
B4
L443
B5 LR-397
B6
B7 PRE1
14V
D271 L272 L273 C275 C277 D272
1SV263 1uH 1.2uH 680p 390p MA77 C452 C453 L445 R452
150uH
D772 R964 0.1 0.1 680
MA77 39
C273
68p
IC451
uPC1658G
5 4
SETC VCC
6 3
IN OUT
B5 7 2
BYPS SETE
8 1
BYPS GND
B8
B9
B10
B10W PRE2
8VL
D771
L772 HSB88WS
D231 D232
1SV265 L252 L253 C255 C257 MA862 617DB-1327
1.2uH 1.5uH 0.001 560p
2 3 3 2
4
C253
1 5 4 1
82p
R961
10 L962 L961
0.15uH 82nH
B4
C968 6 C964 C962
0.1 18p 68p
4 1
C966
IC961 0.1
5 3 2
uPC2708T
L232 L233 C235 C237
1.5uH 2.2uH 0.0033 0.001
C233
120p
B3
C711
0.0047
D191 L192 L193 C192 D192
D711
1SV263 2.7uH 3.9uH 0.1 MA77 L711
MA862
LS-254 FI711a FI711b
4 1 FL-315 FL-315
C194 C196
680p 220p
3 2
L712
LS-254
B1
D211 L212 L213 C215 C217 D212
1SV263 2.2uH 2.7uH 0.0022 0.0012 MA77
C213
200p
Q722
R759
B2 UMC3N D751 L752
2.2k
MA77 LS-484B
4 3
2
5 1
RX 13.3V
TX 0V ALC
R8V
T8V
14VL
8VL
S3LO
R862
IC841 FI843
2.2M C844 Q801
TA31136FN SFECV13.35MA
R848 0.0047 2SC4081
1 16
1k OSCIN MIXIN
R861
R865 D861 4 2 15
470k OSCOUT GND C840
2.2k MA2S111 2 3 14
1 - MIXOUT N-REC 7p
3 4 13
+ VCC N-DET
5 12
11 IFIN RSSI FI841 R803
6 11
SFECV13.35MA 10k
IC871a R847 DEC IFOUT
FI842 7 10
NJM2058M 220 FILOUT QUAD
CFJ455KB 8 9
FILIN AFOUT
O I
B
SATV
SAGC
8VS
BLBV
BLAV
MKR
D421 C491
MA77 0.1
L601 L602 L603 C606 L606 L666
0.12uH 0.27uH 0.33uH 0.1 68nH LR-358
D432 Q601
C609 C602 C604
MA77 2SK2171
33p 18p 6p
L491 C610
D442
LR-395 18p
C444 MA862 C481
0.1 220p
3 2
D481
4 1 MA77
L621 L622
C613 0.27uH 0.27uH
0.1
L444
100uH
Q611 Q612 C622
D631
L611 R612 2SK1740 2SK1740 L613 5p
1SV265
LR-362 1k LS-309
1 5
C455
4
0.1
2 3
R455 R613
39 1k
L612
100uH
Q613 Q614
C614
2SK1740 2SK1740
0.1
12.2V
D561
L501 L502 L503 C506 2.6V L506 L566
MA862
0.12uH 0.27uH 0.33uH 0.1 68nH LR-358
3 2
C509 C502 C504 Q501 4 1
33p 18p 6p 2SK2171
L771
617DB-1327 C510
18p
R772
33
RX 3.6V
L568
TX 2.9V
10uH
L521 L522
L754 L753 C513 0.27uH 0.27uH
0.15uH 0.15uH 0.1
Q511 Q512 C522
D531
C759 L511 R512 2SK1740 2SK1740 L513 5p
1SV265
7p LR-362 1k LS-309
1 5
4
2 3
R513
1k
L512
100uH
Q513 Q514
C514 R537 C542
2SK1740 2SK1740
0.1 11.7V 2.2k 0.0047
D534
MA77
RX 13.0V
TX 0V
D721 D781 D783
L713 C781 C788 L721 R724 3.3V
MA862 1SV265 1SV265
LS-254 0.1 0.1 LS-484B 10
2 3 1 5 1 5 Q721 L722
3SK131
LS-484B
4 4
1 4 2 3 2 3
RX 1.2V
L781 C789 TX 0V
RX 1.2V
10uH 0.1
C723 R727 TX 0V
RX 4.6V
10p 10k
TX 0.7V
D782 L782
1SV263 10uH
RX 0V RX 8.0V
TX 6.7V Q751 TX 0.7V
R785 D741
2SK882 R758 L755 C751 R733 L741 HSB88WS L742 R742
1.2k
4.7 0.68uH 0.001 15 LR-358 LR-395 15
Q781
2SC4081
C706 0.1 R708 1k
RX 5.2V
TX 1.4V
T8V
A L802 R807 C805 C813
2.7uH 1k 0.0047 10p
D831
L812 L813 R820 L831 HSB88WS
LS-484B C819 LS-484B 15 LR-358
2p
Q811 Q812
2SK882 2SK882
Scope ATT A B
0 dB 0.2V 0V
0.8V 0.73V
10 dB
20 dB 1.4V 1.38V
30 dB 3.4V 3.6V
scope activate SAGC
8VS
BLBV
BLAV
J481
MKR from PLL
L665 L664 L667 C664 R663 C661 unit J851
68nH 68nH 68nH 0.001 33k 39p
J661
C668 C666
D-WATCH BAL 1 2 3 4 1LOB from PLL
7p 10p
Q661 OFF 0.4 0 4.7 4.8 unit J651
2SC4673
left 0.4 0 4.7 4.8
ON center 4.7 4.8 4.7 4.8
L663 right 4.7 4.8 0.4 0
10uH
14VB
8VL
BLBV
R632 1
1.5k R635 D636
10k MA2S111
Q631 Q632
2SC4081 2 2SD1664
D632
D635 C636 Q651 C652
1SV265
MA77 0.0047 2SK1740 18p
1 5
4
2 3
L631 C637
10uH 0.0047
D633
1SV263
L653
LR-358
L565 L564 L567 C564 9.5V R563
68nH 68nH 68nH 0.001 33k
C561
39p J561
C568 C566 1LOA
from PLL
7p 10p
Q561 unit J351
2SC4673
D536 L530 4
MA2S111
L563 10uH
BLAV
10uH
R8V
8VL
R532 3
1.5k
R535 Q532
Q531
10k 2SD1664
2SC4081
D532 2.2V
D535 C536 Q551 C552
1SV265
MA77 0.0047 2SK1740 12.2V 18p
1 5
4
2 3
L531
C537
10uH
0.0047 12.9V
D533
1SV263
RX 3.1V L943
C941 12.8V
TX 2.8V LS-532
0.1
C744
Q941 Q942 W941 0.1
2SK1740 2SK1740
L941 R941
LR-358 470 L942 Q945 L534
LR-358 2SD1664 120uH
R943
470 R947
220
C942 Q943 Q944
0.1 2SK1740 2SK1740
R944
1k
P741
J741 W741
D742
T/R2IF to MAIN
1SV308
unit J101
C745
L701
0.1
LS-484B R702 W742
100
D743 12.5V
1SV308 C704 R706
D701 MA862
0.0047 15 J901
4 1 Q701 2LO from PLL
2SK882 unit J81
3 2
R8V
14VL
8VL
J841
S3LO from PLL
unit J801
6.6V
L832 L833
LR-358 LS-484B
C834
0.0047 J831
Q831 S2LO from PLL
2SK882 unit J901
R832
15
MEASUREMENT CONDITIONS
VOLTMETER :50kΩ/VDC
OSCILLOSCOPE:20MHz
DISPLAY :14.1MHz USB
BLBV
BLAV
10 - 8