Icom IC-706MKIIG Service Manual page 53

SECTION 9 BLOCK DIAGRAM
ATT D572
D561 MA862 FI561
IC571 D551
D562 MA862 FL-23
HSB88WS
µPC2713T
NB XTAL
IF AMP
R8V
GETE BPF
AGC
9.0115 MHz
ATT D572
LPF ATT 3 dB
TX TOTAL GAIN
R579 RV-143 Q636 GATE 10.7 MHz
ALC
DTA114EE CTRL
Q572
UL Q621
2SC4081
2SK882
WAVE
NB
NOISE
NBS
CTRL SW AMP
Q634 2SC4081
Q635 DTC114E Q631
2SK1576
WCNT
D632 NB AGC
Q573
1SS375 GAIN
DET CTRL
2SC4081
CONTROL
Q632
R623
DRIVE
2SK882
RV-148
NOISE
CTRL
IC631 AMP
LA1150N
DRIV
WFM NOISE
DET AMP
DATA
R900
OPT
IC861
RV-150
IC841
UT-102
BU4052BCFV
TA4101F
WFAF
IC891B
IC891A
NJM2902V
NJM2902V SSAF D761
MODE
1SS375
BEEP AMAF
AF
LPF SW
AMP AM
FMAF LPF
DET
R896
EVN-D2AA03B25
3 kHz
3 kHz
SQL
IC891C IC811A IC791
NJM2902V IC811D NJM2902V NJM2902V
TA31136FN
LPF IC811C NJM2902V
DE- FM
CTCV
DET
EMPH
LPF
9600 DATA OUT
250 MHz
IC1141B IC981D IC981C
CERAMIC
BU4052BCFV NJM2058M NJM2058M
BPF
9600 DATA IN
BFO
COMPA-
FI791
SW AMP OVDV
RATOR
SFPC455E
IC1141A
BU4052BCFV
POCV
AMOD ALC
SW
HFOR
AMP
MIC
VFOR
MIGV
UFOR
IC931
COMS
µPC5023-077 HREF
APC
VREF
AMP
UREF
AMP BUFF
ICH
VCA BUFF
APC
ICL AMP
LIMIT
KDS8
AMP
COMP GAIN
R945
IC971
EVN-D2AA03B25
TC4W53FU
AMP
Q1011 2SK210
AM
Q961
D1012 MA357
IC981A IC981B
2SC4081 D1013 1SS375
NJM2058M NJM2058M
D1014 1SS375
PRE-
FM
AMP BUFF EMPH/ LPF
LIMIT
AFO
ETON
TONE
N DATA
8V +5
REG
IC2001
IC5 S81250PG-PD
HD64F3337Y
KDS Q10 2SC4081 R
VOXL
Q11 SSB1143 S
DRES
AVXL
D9 MA2S111
CTCV
MAIN X1
DASH
MA-406
CPU
DOT (9.8304 MHz)
UL
IC4
X2161
IC2121 S-80945ALMP
EEP
CR-636
ROM X25650S8I-2.5
(14.7456 MHz)
RESET
IC2122B TC7W04FU
HV IC6
IC2161 CI-V IC2122C TC7W04FU
RESET X24C0IS-2.7-T
S-80942ANMP-DD6 I/F Q2171 2SA1576
Q2172 2SC4081
IC2131 TC4S81F EEPROM
Q2131 DTC114EE
IC2201
TUNER
D2133 DAN222 D/A
M62352GP
CTRL
LED
IC2221 BU4094BCFV
IC2222 BU4094BCFV
IC2231 TC74HC4094AF DRIVER
IC2232 BU4094BCFV
LED
EXPAND IC2202
DRIVER
NJM2902V
N DATA
IC2202 Q8 XP4111
IC351
Q12 XP4111
NJM2902V
TD62783AFN
DRIVER
Q15 DTA114EE
DATA
IC2241
TD62783AF PTT
Q2221 UMC3N
DRIVER
Q2222 UMC3N
Q4 2SD1619 T
Q2223 UMC3N
Q2224 UMC3N Q9 DTA114EE
Q2225 UMC3N
FI511
ATT D522 ATT D521
FL-261
XTAL
CTRL
IC521
D271
µPC1688
69.0115 MHz
HSB88WS
T8V R8V
IF
ALC AGC
ATT
BPF
AMP
ATT D522 ATT D521
69-71 MHz 3 dB
BPF
70.7 MHz
R8V T8V
AGC ALC
2LO
ATT
FI611 FI601 3 dB
SFECV10.7MA-5 SFECV10.7MA-5
IF IF
CERAMIC CERAMIC
AMP AMP
BPF BPF
Q611 Q601
2SC4081 2SC4081
MAIN UNIT
Q751 Q741 Q731 Q721
FI671
2SC4081 2SK882 3SK126 2SC4081
FL-272
XTAL
IF IF
BUFF BUFF
BPF
AMP AMP
SSB/CW/RTTY
RX TOTAL GAIN
AGC
FI681
R741 RV-148
FL-94
Q776 2SC4081
IC811B XTAL
Q771 2SC4081 D772 Q772 UMC1N
NJM2902V Q777 2SA1576
BPF
D771 1SS375 MA2S111 Q773 UMC1N
AGC
AM/FM-N
AGC RFG DELAY AGC
BUFF
DET CTRL CTRL AMP
OPTION
FILTER-1
RFGC AGFS
XTAL
AFMS SML BPF
METER
AMP
Q774
OPTION
2SC4081
FILTER-2
IC1091A Q1092
XTAL
IC1091B
NJM2902V 2S4081
BPF
NJM2902V
ALC ALC
BUFF
AMP
FM
ALCL
IC1091C
NJM2902V
Q1131 D1131 MA8036 L
2SA1576 D1132 DAP222
ALC EALC
LEVEL
AMP SHIFT
IC1091D
NJM2902V
WAVE
FORM
CW/RTTY IC1041
NJM1496V
SSB/AM
Q1013 AM
AMS8
2SC4081 CARR
Q1041
CTRL
DTC114EE
9.0115 MHz
BUFF
IC1011
T8V
LC7153M
5.006 kHz
LOOP
PD 1/N
FILTER
BFO
1/R
IC2 Q14 2SC4081 R
SED1522F0 DS4 Q13 2SC1132 R IC291
TA7805F
KEY
LCD
KEY 5V 14V
LCD DIMMER
+5
DRIVER LIGHT
CTRL
REG
KEY
8V
+8
REG
IC3
IC281
BU4030BG MAIN DIAL
TA7808S
WAVE
IC1
FORM
HD6433834H
CTRL
SUB
SUB DIAL
IC201 M5282
CPU
OPT
SHFT AMP VCA
UT-106
AF
AAF
DATA
RF/SOL
VR BOARD
Q2 2SB1132 R
RX
Q3 2SC4081 R
TX
DIMMER BACK
COMMON
CTRL LIGHT
DS5 D2264 DATA BUS
PTT
DISPLAY BOARD
FRONT UNIT
9 - 1
LPF ATT HPF BOARD
3 dB IC151
LPF
µPC1658G
0.1−2 MHz
30−40 MHz
40 MHz
PRE
LPF ATT
AMP
HFP 2−4 MHz
3 dB
IC281
µPC2709T PR1S
1LO HFP 4−8 MHz
LO
ATT
AMP
3 dB
8−15 MHz
HFP
15−22 MHz
HFP
22−30 MHz
HFP
40−60 MHz (TX or RX/PREAMP OFF)
HFP LPF
40−60 MHz (PREAMP ON)
PRE
LPF HFP
AMP
Q191
2SK2171 4
144 MHz
RF
HFP LPF
AMP
IC221
TA4001F
440 MHz
RF
BPF
AMP
FI371 FI372 FI373
IC222
LFSC25N12B 0440B
TA4002F
Q362
2SC4116
8V
RIPPLE
FIL
Q391 VCO3
2SC4116
Q361 2SK508
RIPPLE Q381 2SC4213
FIL
D361 1SV304
VCO2
Q331 2SK508
Q491
Q351 2SC4213
2SK880
Q352 DTA144EU
D331 KV1470
MLLV
VCO1
BUFF
Q301 2SK508
IC461
Q321 2SC4213
LMX2306
Q322 DTA144EU
D301 KV1470
1/N
P/D
DIV
Q21
2SC4081
1/R
ATT
DIV
UN-LOCK
UL
LEVEL
N DATA
UN-LOCK ATT
CONV
Q261 DTC114EE
Q461 DTA144EU
D261 DAN222
AMP DDS
Q161
N DATA
2SC4403
D/A
Q941
IC901
2SC4403
IC271
SC-1287
TA78L05F
BFO
H5V HV
LPF HPF D/A DDS AMP
+5
REG
N DATA
Q681
2SC4403
2LO ×
BPF 2
(60.000000 MHz)
IC231
RL231 SY-12-K
LA4425A
Q232 DTC114EU
AF
AMP
AFGC AFO SPS
(FRONT PHONE)
FILTER UNIT
LPF ATT
1.6 MHz 10 dB Q111 DTC114EE Q9 RL1
Q112 DTC114EE 2SC4213 B AG201344
RF ANT
ATT HPF LPF
SW SW
20 dB 1.6 MHz
Q121 DTC114EE
Q122 DTA114EE
HPAO
LPF
Q171
DRIVER (a) RD70HVF1
60 MHz
Q101 Q121
Q161 Q172
2SK2854 F 2SK3074 F
MRF1518NT1 RD70HVF1
HF/ 50 MHz
PRE PRE
YGC PWR
DRIVE
ATT HPF
DRIVE DRIVE
AMP AMP AMP
3 dB
IC231
µPC2709T
LPF BIAS BIAS
144/440 MHz
D171 DAN202U
D172DAN202U
D261 MI407
DRIVER (b)
D291 UM9401F
Q231
Q211
D292 UM9401F D262 MA742
SRFJ7044
MRF1508
D293 1SS355 D263 MA742
TX/RX PWR
DRIVE PWR
LPF
AMP AMP SW DET
VFOR
D311 UM9401F
BIAS BIAS
D341 UM9401F
D342 UM9401F
D343 1SS355
D344 UM9401F
Q301 DTC114EU
D312 MA742
Q351 DTC114EU
D313 MA742
PA UNIT TX/RX PWR
HPF LPF
DET
SW
UFOR
Q402 DTC114EU
D406 MA2SV05
Q403 3SK291
D407 MA357 D401 1SV308
D403 MA2SV05
D410 MA2SV05 D402 1SV308
D408 MA357
D409 MA2SV05 144 MHz
PRE
BPF ATT
AMP
VURX 440 MHz
PRE
BPF ATT
AMP
D451 1SV308
D454 1SV305
Q452 DTC114EU
D452 1SV308 14V
D456 1SV305
Q453 3SK291
D453 1SV305
D455 1SV305
AMP
ATT LPF HPF
FREQ: (DISP, FREQ) + (69.0115 MHz)
Q10
2SC4405
LPF
RX FREQ=0.03-29.999999 MHz
LPF
IC541
D531 PC2710
RX FREQ=30-59.999999 MHz
MA717WK
×
2 HPF AMP HPF LPF
RX FREQ=60-128.999999 MHz
Q1 2SK210
D1 MA357
LPF
HPF
LOOP
AMP
FIL
Q51 RX FREQ=129-143.999999 MHz
2SC4081 RX FREQ=148.000001
-199.999999 MHz
AMP
HPF LPF
RX FREQ=144-148 MHz
P/D
HPF LPF
RX FREQ=400-470 MHz
IC101
SC-1246
FIL
CERAMIC
AMP
BPF SELECT
Q71
FI71 Q141 DTA114EU
2SC4081
SFECV10.5MA-5 Q142 DTA114EU
Q931 2SC4081 Q143 DTA114EU
Q144 DTA114EU
D931 MA2S111
Q145 DTA114EU
LEVEL FSKK
Q851 DTA114EU
CONV
Q661
Q621 2SC4403
2SC4403
D601 MA357
R602 RV-150
BUFF
LPF
OPT
(30.000000 MHz)
CR-282
X621
CR-275A
(30.000000 MHz)
PLL UNIT
LPF
HFOR
BUFF
0.03−2.0 MHz
IC1B
NJM2904M
LPF
HREF
2.0−4.0 MHz BUFF
IC1A
NJM2904M
LPF
4.0−8.0 MHz
D9 1SS375
D10 1SS375
LPF
PWR
/SWR
8.0−15.0 MHz
DET
LPF
15.0−22.0 MHz
LPF
ANT1
HF/
22.0−30.0 MHz
50 MHz
LPF
ANT2
144/
30.0−60.0 MHz 440 MHz
144 MHz
LPF
440 MHz
HPF
FAN
FAN
CTRL
D573 DAN202U
D574 MA8056 M
CHASSIS
D575 DAN202U
Q571 2SB1132 R
UNIT
Q572 2SC4081 R
SP
RL591 JV-12-KT
Q591 DTC114EE
HV
from PS
F591
FGB 4A