Main Unit (2) - Icom IC-756PRO Service Manual

10-4 MAIN UNIT (1)
CP741 CP745 CP747 CP750
J741
14V L701 EXC-ELDR25C 14V
14V T8V
L702 HF50ACC322513-B
14V H5V
L704 100uH 8V
T8V L703 HF50ACC322513-B
14VA
5V R8V
5V -8V
-5V
-8V HV
to CTRL
unit J7
FORV L705 100uH FORV
REFV L706 100uH REFV
ANTS L707 100uH ANTS
DRES DRES L271
GND Q271 LS-450
L718 EXC-ELDR25C
2SK882
ISTA ISTA
IKEY IKEY
GND
FSTB R763 220 FSTB
R761 220 MDAT
CMDT
CMCK R762 220 MCK
J101
T/R 2IF
from RF
unit J741
R8V
T/R 2IF
T8V
J771
-5V
PAT8 PAT8
L716 HF50ACC322513-B -8V
PWRS L715 100uH PWRS
ICL ICL
L714 100uH
ICH L713 100uH ICH 5V
H5V H5V 14V
L717 HF50ACC322513-B
8V L712 HF50ACC322513-B 8V 8V
8V
14VA L711 HF50ACC322513-B 14VA
14VA
14V
14V
14V L710 EXC-ELDR25C 14V J1702
14V H5V
to PA 14V FZRX
unit J3
14V FZTX
14V FZRS
5V 5V
L709 HF50ACC322513-B FZVP
5V FZMD
HV HV FRMD
L708 100uH
GND
GND
GND
GND
GND J861
GND
GND
GND SQSS
GND AFO
GND MICE
MSND
8V
J811
MICI
14V L720 100uH 14V 14V GND
14V GND
AGC AGC GND
8V 8V GND to DISPLAY
L719 EXC-ELDR25C
board J321
ALC PWRK
T8V T8V TMD
CP820
CP833
CP815 CP816
R8V R8V SPE
-5V L721 150uH -5V
to RF
unit J951
5V 5V
TRVI
RANS 14V
RANS
SATV SATV
BLBV BLBV
BLAY BLAV
SCPL SCPL
GND
CP801
MDAT MDAT
R3801 220
J891
MCK R3802 220 MCK
BSTB R3803 220 BSTB
14V
CP841
J841
GND
GND
-8V
14V 14V
14V
UNLC UNLC GND to DISPLAY
PSEL RSEL GND board J301
to PLL CON2 CON2 GND
unit J1 CON1 CON1 GND
CON0 CON0 VSYNC
DRES DRES HSYNC
PSTB PSTB
B
5V 5V G
5V R
YOBI
CP849 CP850 CP851 CP852 CP853
8V 8V DRES
LMFD
LFMD
CP856
CP271 CP272
L272
Q276
Q272 LS-450 Q273 C280
2SC4081
2SK882 2SK882 0.0022
R288 Q277
R285 1k UMH11N
2.2M
4
R284
R289
47k 5
Q275 470
2SA1576
6
D272
MA2S111
Q274
2SC4081
R8V
T/R 2IF
T8V
-5V
-8V
MICI
5V
14V
8V
L111
FI132 L112
D111 C121 LS-468
SFPC455E-TC01 LS-468
1SV308 0.1
O
I
J201
D115
GND
1SV308
8V
8V
FMTL
L201
8V
HF50ACC322513-B
GND
-5V -5V L261
LS-469
GND L202
-5V HF50ACC322513-B
GND
-8V -8V R116
1k
GND
L203
-8V HF50ACC322513-B
CP202
DRAF Q503 Q504
2SC4081 2SC4081
GND
to DSP CP203 CP211 R514
DTAF R3787
board J2001 47k
10k
AGC
GND
GND Q3773
CP204 DTC114EE
DMAF
GND
CP205
CP501 CP502
D5VA D5VA
GND
L204
D5VA HF50ACC322513-B
GND
D5VA 8V
GND -5V
CP206
DRIF T8V
DTIF DTIF
GND ALC
GND AGC
J202 R515 UNSB
470k
Q505
AGRS
R512 1.5M 2SA1576
3R3V_d 3R3V_d
GND
IC551B
3R3V_d
NJM2058M
R513
M5V_d D502 R504
R505 6 330
GND MA2S111 33k - 7
CP228 220k 5
GND +
NSQ0
DSDR
DPGI
Q501
UMH11N
MODS
4
FMNS
5 3
MCK
to DSP
CALS
board J2002
DSFW
6 2
ACKS Q507
DTA114EE
MDAT
1
DSRS
DSFR
AMS
CTFL
TXS
RTDT TRVI
MSL1 MICI
GND -8V
DSKY D5VA
GND 3R3V_d
GND M5V
L205 HF50ACC322513-B
CP242
14V
T8V
H5V
8V
14VA
R8V
-8V
-5V
HV
8V
L274
100uH
Q278 W201
UN911H
8
R207 R209 2
3 1 7
1k 1k -
3
+ IC201A
R208 uPC4570G2
4 IC201B
1k
2 uPC4570G2
1
FI111
CFK455E10
I O
SSB 3.5V
FI131
FM 0V C130
CFWM455D
0.1
I O
C127 C129
0.0047 0.0047
Q141 D113
L113 UMH11N MA862
FI133
D112 LS-469
4 4 1 CFWS455IT
1SV308
3 2
I O
5 3
C132 C133
D116
0.0047 0.0047
1SV308
6 2
R119 C126
10k 0.1
1
C242
0.0047
Q261 Q142
2SK882 C261 DTC114EE SSB 0V R253
0.0047 FM 3.4V 1.8k
Q241 R242
2SK882 470
R252
1.8k
C102 0.0047
C262
D251
0.047
DAN222 R102 150k
IC101A
NJM4558M
C266 2 4
0.001 1
-
3
+
R104 8
100k
C104
8V 0.1
-5V
DTIF
ALC
AGC
R517
Q506
470k
DTC144TE
R533 R546
220k 1M R552 8.2M
R516
22k
R532 R551
D504 Q521
10k 3.3M 4
MA2S728 2SA1576 9 13 2
- 8 - 14 - 1
10 12 3
+ + +
R541
R534 IC551C IC551D 11
47k
68k NJM2058M NJM2058M
Q502 IC551A
UMH4N NJM2058M
4
5 3 IC803
TA7805F
Q801
2SC4081 I O
6 2 IC802 G
TA7805F
Q803
1 DTA144EE
I O
G
MICI
-8V
D5VA
3R3V_d
M5V
14V
T8V
H5V
8V
14VA
R8V
-8V
-5V
HV
IC801
BA033T
I O
G
IC331
TC4W53FU
1 8
AFMS 2 7
BANV
3 6
4 5
6 R107
- 100k
5
+
6
- 7 BANS
5
+
R108 IC301
470 TC4W53FU
IC101B
NJM4558M
4.0V 1 8
2.0V
C307 R301 2 7
0.1 1k
3 6
4 5
IC151
C146
NJM1496V
0.0047 SQLS
1 14
VS+ V- DRAF
R151 2.7K 2 13
VCS NC
3 12 C308
VCS VO- C155 R212 C304 R304 10
4 11
VS- NC 0.001 100 0.1 10k
5 10 BEEP R361
BIAS VC- 470
6 9
VO+ NC
7 8 R302 C302
VC+
NC 1k 10
RECO
C303 R303
10 1k
R156
15k IC361
TC4W53FU
1 8
MSL2 2 7
3 6
4 5
R126 R136 R362
10k 1k 470
IC221
C228 NJM1496V
0.1
1 14
VS+ V-
R224 220 2 13 MSL1
VCS NC
3 12 RECI
VCS VO- C221 R213
4 11
VS- NC 0.001 100 W365
5 10 DMAF
BIAS VC-
6 9
VO+ NC
7 8
C229 VC+
NC
100p
IC362
TC4W53FU
R223
3.9k VOXL 1 8
R391 2 7
470
3 6
4 5
MOSL
VX2
AMPO
R475
100k
C471
1
R471
C476
10k
W562 W572 0.1
VX1
D561 D571 R473
8
6 MA2S111 2 MA2S111 15K
- 7 - 1
5 3
+ +
4
IC571B IC571A
NJM4558M NJM4558M
Q471
2SC4081
IC805
AN79L05M
I O
G C474
100
Q804
R802 2SD1801
47
R806 R807
1k 220
C869
4.7
MICI
-8V
D5VA
3R3V_d
M5V
BUS LINE
14V
T8V
H5V
8V
14VA
M5V
R8V
-5V
HV
3R3V
Q334
DTC114EE
D351
Q331 DAN222
R343 2SD1801
10k
Q351
DTC114EE
SSP
Q333
C351
CPH3404
0.0047
Z1
R305
R341
470
100k RL351
AHY103
SSP
C334 C338
10 5 470
1
4 AFO
2
3
IC332
LA4425A
SPE
M5V
C327 R311
1 47k IC311
M5282FP
1 10 R316 10 8V
VCC2 VCC
2 9 C319 1
IN+ VCAOUT
3 8
IN- CTL
4 7
OUT VCAIN
R312 5 6
GND NC C317
10k
1
C312
0.0022
AFGV
W311
M5V
R325 MAIN(2)
AAFO
1k
AFE
STON
R321 C320
4.7k IC371
1
R372 M5282FP
R378
47k
1 10 100
VCC2 VCC
IC372 2 9
IN+ VCAOUT
BA3308F 3 8
IN- CTL
1 14 4 7
OUT1 NC OUT VCAIN
2 13 5 6
GND IN1 R374 GND NC
3 12 R369
100k
NC NC 1k
4 11
ALC NF1
5 10
VCC NF2
6 9
NC IN2
7 8 R392 MONV
OUT2 NC
RV-108 C392 R394
M5V
0.1 100k
SPCH
R377
4.7k
C376 0.01
MICO
R478 R453 C453
100k 4.7k 1
IC451
uPC5023-077
1 24
NC GND
2 23 W452 MICE
CMPI AMP+
3 22
CMPO AMP-
4 21
SWI AMP0
5 20
BU1I BU2I
6 19
C465 R464 BU1O BU2O
0.1 47k R463 7 18 R455
SWO VOXI
10k 8 17 150k
VCAI VOXO
9 16
VCAO MUTE
10 15
VCAC AVO C459
11 14
0.001
SWC AVI
12 13
VCC NC
R459
R460 220k
100k
C463 C462
R462 R461 0.1 100p
10k 22k AFO
AVXL
L452
RCR-875D-472k
MIGV
AMOD
3R3V_d
M5V
10 - 4