Main-A Unit (1) - Icom IC-756PROII Service Manual

10-4 MAIN-A UNIT (1)

MAIN-A UNIT (1)
W702
J741 C702 0.1
L701 EXC-ELDR25C 14V
L271
C703 0.1
LS-450 Q272
C704 0.1 Q271
2SK882 2SK882
C705 0.1
L702 HF50ACC322513-B T8V
L703 HF50ACC322513-B 5V
GND
L704 100µH –8V
to CTRL
unit J7 L705 100µH FORV
L706 100µH REFV
L707 100µH ANTS
DRES
GND W703
ISTA
IKEY R8V
R763 220 FSTB
CMDT R761 220 MDAT
CMCK R762 220 MCK
14V
T8V
–8V
J101 H5V
from RF-A 2IF 2IF
unit J741 C122 8V
0.1 R118 L115 14VA
330µH
470 HV
AGC
J771
ALC
L716 HF50ACC322513-B PAT8
R8V
L715 100µH PWRS
–5V
L714 100µH ICL
5V
L713 100µH ICH
L717 HF50ACC322513-B
H5V
L712 HF50ACC322513-B 8V
L711 HF50ACC322513-B 14VA
L710 EXC-ELDR25C 14V
to PA
unit J3
L709 HF50ACC322513-B 5V
L708 100µH HV
GND
J861
14V
14V
14V
J811
SPE
L720 100µH 14V
AFO
SPE
AGC
TMD
L719 EXC-ELDR25C 8V
PWRK
ALC
GND
T8V
GND
GND
GND
L721 150µH R8V
MICI
–5V
to RF-A 8V
unit J951 MSND
5V
MICE
TRVI
SQSS
SATV
BLBV
BLAV
SCPL
GND
R3801 220 MDAT
J891
R3802 220 MCK
LFMD
R3803 220 BSTB
LMFD
DRES
R
G
B
J841
HSYNC
GND
VSYNC
GND
GND
GND
14V
GND
UNLC
PSEL
–8V
to PLL CON2
–8V
unit J1 CON1
CON0
DRES
PSTB
14V
5V
14V
14V
8V
W1001
L272 L273 CP271 CP272
LS-450 Q273 LS-450
Q279 C289 Q276
2SK882 0.0022 2SC4081
2SC4081
R285
R292
2.2M
22k
R284 Q275
47k 2SA1576
Q274
2SC4081
14V 14V
T8V T8V
–8V –8V
H5V H5V
2IF 2IF
8V 8V
14VA 14VA
HV HV
AGC AGC
ALC ALC
R8V R8V
–5V –5V
5V 5V
M5V
MEASUREMENT CONDITIONS
DISPLAY FREQ. :14.10000MHZ
MODE :USB
MEASURE :VOLTMETER, OSCILLOSCOPE
D111
IC802
1SV308
TA7805F
8V M5V
J201 I O
G
GND L201
HF50ACC322513-B
8V_ 8V
FMTL
8V_
GND
T8V
–5V_ –5V
GND R514
L202
–5V_ 47k
HF50ACC322513-B IC803
GND TA7805F
–8V_ –8V 8V
I O
GND G
L203
–8V_ HF50ACC322513-B
CP202
DRAF
R804
GND 470
to DSP-A CP203 CP211
board J2001 DTAF
AGC AGC
GND
L261
GND LS-469
CP204
DMAF
Q804
GND
CP205 2SD1801
D5VA D5VA
to DISPLAY GND
L204
board J321 D5VA R802
HF50ACC322513-B
GND 47
D5VA
CP212
GND IC805
CP206
DRIF AN79L05M
DTIF –8V –5V
I O
GND G
GND
ALC
C209 470
J202
IC801
AGRS BA033T
3R3V_d 3R3V 8V
O I FORV
GND G
L206
3R3V_d HF50ACC322513-B
M5V_d
GND
CP228 L205
GND HF50ACC322513-B
NSQO
DSDR
TRV
DPGI
Q803
UNSB
DTA144EE
MODS
TRVI D502
MA2S111
FMNS
MCK
to DSP-A
to DISPLAY board J2002 CALS Q801
board J301 DSFW 2SC4081
ACKS
MDAT Q501
DSRS UMH11N
DSFR 4
AMS BANV
5
CTFL
TXS R107
6
100k
RTDT
2V
MSL1
6
GND – 7 BANS
5
DSKY +
R108
GND 470
IC101b
GND NJM4558M
4V
CP242 3R3V_d
3R3V
R202
L274 2.2k
100mH
IC201a FI111
BA15532F CFK455E10
Q278 W122
UN911H R207 R209 6 I O
2 8 – 7
1.5k 1.5k – 1 5
3 +
+
4
R208 IC201b
1.5k BA15532F
CP213
14V
T8V
–8V
H5V
8V
14VA
HV
AGC
R8V
–5V
M5V
L141
Q131
LS-468
UMH11N
4
L111 L112
L113
C121 LS-468 LS-468 5
LS-468
0.1 C113 470p D113 1SV308
6
Q141
D114 1SV308 3SK131
C119
Q503 0.0047
R135
2SC4081 R3787
1k
10k
MODS
R148 Q132
10k UN9211
Q3773
UN9211 AMS
Q504
2SC4081
AGC
Q261
2SK882
R243
Q241 C261 R253
NTCCM16084BH
2SK882 0.0047 1.8k
CP243
R242 W252 C229
R244 8.2k C102 470p
D252
47k 0.0047
DAN222
R102
270k
ALC
IC101a 2 4
D251 – 1
NJM4558M 3
DAN222 +
POCV
8
Q506
Q505
2SA1576 DTC144TE
C104
FORV 0.1
5V R517
R516 470k Q521
CP502
22k 2SA1576 –5V
8V
R511
CP501 220k R512 3.3M
EALC ALC
R504 R505 6 D504 MA2S728
33k 220k – 7
5
+
R513
IC551b 330
NJM2058M
Q502
UMH4N
4 R533 220k R546 R552 8.2M
R532
1M
10k
3 5 3 9
– 8
10 13 2 4
+ – 14 – 1
2 6 2 12 3
R534
IC551c + +
PO 68k 11
1 1 NJM2058M IC551d
IC551a
Q507 NJM2058M
DTA114EE NJM2058M
R545
RV-150
C158 3LO
0.1 14V
8V
IC151
M5V
TC4W53FU L151
H5V
100µH
1 8 3R3V_d
HV
2 7 –5V
L152 R8V
100µH
3 6 T8V
14VA
4 5
IC331
R153 1M TC4W53FU
1 8
5 5
R333 4.7k
2 4 2 4 2 7
3 3 R337 10k
3 6
IC152 IC153
TC4SU69F TC4SU69F
R340 1k
4 5
14V
T8V
–8V
H5V
8V –5V
14VA
HV
W308
DRAF
C308 IC301
R8V
10 TC4W53FU
–5V
1 8
M5V 2 7
3 6
4 5
C130
0.1
3
FI131 R301 1k C301 10
REAF
2 CFWM455D
SQLS R325
1k
1 I O
R126
D116 C127 C129 D115 STON
0.0047 0.0047 MA77 10k
MA77
C320 R321
1 4.7k
C303 R303
10 1k
RECO
FI133
D118 C133 D117
CFWS455IT
MA77 0.0047 MA77 C304 R304
I O 0.1 10k
BEEP
C132
0.0047 C135
0.1
DMAF W355
SSB 0V
FM 3.4V
R8V R365 IC372
47k BA3308F
8V 1 14
OUT1 NC
2 13
GND IN1
3 12
NC NC
4 11
ALC NF1
5 10 R369
VCC NF2
6 9 1k
R229 NC IN2
5.6k 7 8
DTIF OUT2 NC
R377
4.7k
IC221
NJM1496V
L221 100µH
1 14
VS+ V–
R224 220 2 13 IC362
VCS NC
TC4W53FU
3 12
VCS VO– C221 R213
4 11
VS– NC 0.001 100 VOXL 1 8
5 10
BIAS VC–
6 9
VO+ NC 2 7
7 8
NC VC+
3 6
4 5
R223
3.9k
MOSL
VX2
8V
AMPO
–5V C471 1 R471 1k
RECI
C473
10
C476 0.1
VX1
Q471
2SC4081
R473
IC571a 15k
W572
R562 R561 NJM4558M
470k 220
R571
6 D561 2 8
– 7 – 1 220
5 MA2S111 3
+ + D571
4
IC571b MA2S111
NJM4558M
AMOD
3R3V_d
3R3V
BUS LINE1
14V
14V
8V
8V
M5V
M5V
H5V
H5V
3R3V_d
3R3V_d
HV
HV
–5V
–5V
R8V
R8V
T8V
T8V
14VA
Q331
2SD1801
D351 3R3V
DAN222
C333 R336
0.082
47
Q351
Q334 C351 UN9211
R343 UN9211 0.0047
10k SPS
Q333
CPH3404 MAIN-A (2)
RL351
AHY103
C334
C338
10
1 5 470
4 AFO
2
3
IC332 SP
LA4425A
AFMS
–5V
M5V
IC311
C327 R311 M5282FP
AFE
1 47k
1 10 R316 10
VCC2 VCC
2 9 C319 1
IN+ VCAOUT W319
3 8 AFGV
IN– CTL
4 7
R313 OUT VCAIN
1k 5 6
R312 10k GND NC
C312 0.0022
R314 M5V
W311 4.7k
AAFO
C315
AFE
10
R302 1k C302 10
IC371
M5282FP
C371 1 R372 47k R378 100
1 10
VCC2 VCC
2 9
IN+ VCAOUT
3 8 R381 10k MONV
IN– CTL
R373 4 7 R380 270k
OUT VCAIN
2.2k 5 6
R374 100k GND NC
C363
10
C392 0.1 R394 100k
SPCH
C376 0.01
IC361
TC4W53FU
1 8
R364 39k
2 7
R363 10k
3 6
4 5 MSL1
MSL2
–5V
M5V
R453 C453
4.7k 1
IC451 MICO
µPC5023-077
1 24
NC GND
2 23 C457 2.2
CMPI AMP+
3 22
CMPO AMP–
C465 R464 4 21
0.1 47k SWI AMPO C458
5 20
BU1I BU2I 0.022
6 19 MICE
BU1O BU2O
7 18
R463 R455 270k
SWO VOXI
10k 8 17
VCAI VOXO
9 16
VCAO MUTE C459 560p
10 15
VCAC AVO
11 14
SWC AVI
12 13 C460 R457
VCC NC R459 3.9k
220k 0.022 W452
R460 100k C463 0.1
AVXL
C462 C461 R458
R462 R461
100p 1 6.8k
10k 22k
AFO
L452
RCR-875D-472K
8V
MIGV
3R3V
10 - 4