![background image](http://html.mh-extra.com/html/icom/ic-706mkiig/ic-706mkiig_service-manual_612196069.webp)
MAIN UNIT (2)
14V
8V
5V
R8V
T8V
AMS8
WFMB
AGC
ALC
L1
L2
L3
L4
L5
L6
L7
L8
L9
B0
B7
B7W
BHF
1F15
ATTS
PR1S
PR2S
PR3S
PR4S
TB1V
TB2V
TB3V
TB4V
SQLS
VFOR
UFOR
HREF
VREF
KEY
STRT
CIV
CIVE
FSKK
DASH
DOT
U/D
BAND
DIN
DOUT
MIC
MICE
AMOD
AFO
AAF
EALC
SNOSR
SEND
SDSS
PTTP
ICH
ICL
WFAF
2IF
WCNT
GND
UREF
UL
BDT
HFOR
NBS
J1431
J1381
PLL
J254
CP1381
CP1382
CP1383
CP1384
CP1385
CP1386
CP1387
CP1388
CP1389
CP1390
CP1391
CP1392
CP1393
CP1394
CP1395
HV
14V
14V
FSKK
DDT
IMST
IDS
DINT
GND
AAF
POWS
8V
8V
AFBP
UL
DSPS
5V
AFGC
SPS
MLLV
PCE
PBST
BOT
PCK
CON0
CON1
CON2
PDST
DRES
H5V
CP1396
CP1397
CP1398
CP1399
CP1400
CP1401
CP1402
CP1403
CP1404
CP1405
CP1406
CP1407
CP1408
CP1409
CP1410
C1390
0.001
HV
H5V
14V
8V
5V
R8V
T8V
DRIV
FSKK
DDT
IMST
IDS
DINT
AAF
POWS
AFBP
UL
DSPS
AFGC
SPS
MLLV
PCE
PBST
BOT
PCK
CON0
CON1
CON2
POST
DRES
J1421
CP1421
C1421
470p
CP1422
CP1423
CP1424
CP1425
CP1426
C1426
0.0047
CP1427
CP1428
C1427
0.0047
C1428
0.0047
LRXD
LTXD
8V
AFO
GND
MIC
MICE
PWK
LRXD
LTXD
AFO
MIC
MICE
PWK
DRIV
HFOR
VFOR
UFOR
HREF
VREF
UREF
UL
BDT
KEY
STRT
CIV
CIVE
FSKK
DASH
DOT
U/D
BAND
DIN
DOUT
MIC
MICE
AMOD
AFO
AAF
EALC
SNOSR
SEND
SDSS
PTTP
ICH
ICL
WFAF
R8V
T8V
AGC
ALC
L1
L2
L3
L4
L5
L6
L7
L8
L9
B0
B7
B7W
BHF
1F15
ATTS
PR1S
PR2S
PR3S
PR4S
TB1V
TB2V
TB3V
TB4V
SQLS
FRONT
MP19
CP1431
CP1432
CP1433
CP1434
W1433
AFI
AFIE
AFOE
AFO
AFI
AFIE
AFOE
AFO
R896
200k
R902
4.7k
C895 1
R903
4.7k
-
+
6
5
7
IC891b
R898
100k
C899
0.001
R899
100k
R901
47k
R900
R
V
-150
(10kB)
C896
0.1
C897 1
R91
1
100k
13
12
14
IC891d
R913
470
BAND
BANV
SPCH
AFBP
R912
100k
R895
4.7k
-
+
-
+
1
11
4
2
3
C894
0.0047
C893
0.001
R894
100k
C892
0.01
R893
47k
R892
56k
R891
120k
C891
0.1
C898
0.1
IC891a
NJM2902V
IC891c
8
9
10
-
+
R883
47k
C883
1
R882
10k
C882
0.0022
R884
10k
C881
0.0047
R881
10k
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
Y0
Y2
Y3
Y1
INH
VEE
VSS
Y
VDD
X2
X1
X
X0
X3
A
B
R871 10k
R870 47k
C862
0.0047
IC861
BU4052BCFV
R869 12k
R866 480k
R864 15k
R862 68k
NBS
WFAF
AFIE
R861
2.2k
R872
10k
C861
10
AFS1
AFS2
SQL
CP931
MIC
VOXL
R935
6.8k
A
VXL
R940
6.8k
C936
0.1
C939 1
C938
100p
R939
100k
C937
0.1
R938
100k
R936
10k
R937
10k
AFO
13
14
15
16
17
18
19
20
21
22
23
24
C934
470p
R933
100k
C933
2.2
R932
82k
C932
470p
C935
0.047
R934
10k
R931
4.7k
C931
2
NC
AVI
AVO
MUTE
VOXO
VOXI
BU2O
BU2I
AMPO
AMP-
AMP+
GND
VCC
SWC
VCAC
VCAO
VCAI
SWO
BU1O
BU1I
SWI
CMPO
CMPI
NC
IC931
PC5023-077
12
11
10
9
8
7
6
5
4
3
2
1
R942
1k
C942
0.1
C941
22
R941
220
C940
10
R952
4.7k
R953
10k
MIGV
COMS
R951
220k
R943
6.8k
C943
0.039
R945
200k
R944
22k
R946
10k
C945 1
D932
DA221
D931
DA221
R947
56
C944
0.1
R950
220k
R949
47k
R948
47k
C946
0.1
C1144
0.1
R1149
6.8k
AMOD
CP861
BEEP
AFI
AGC
R846
100k
C778
0.0047
R786
10
C777
0.0047
C779
47
Q777
2SA1576
R785
47k
Q776
2SC4081
J791
BFO
PLL
P251
PLL
J991
CP791
R783
47k
SML
7
6
5
-
+
R779
4.7k
R782
680
C776
0.1
Q774
2SC4081
R778
10k
Q773
UMC1N
C775
10
4
5
3
2
1
AGFS
R777
100
Q772
UMC1N
C774
0.47
AFMS
1
2
3
5
4
R776
100
C773
0.0047
R775
1M
D772
MA2S111
14V
AMAF
FMAF
SSAF
C764
0.01
C763
0.0047
R764
15k
C762
0.0022
R763
100k
R762
68k
R761
1k
D761
1SS375
Q771
2SC4081
R771
4.7k
C772
100p
C761
0.0047
C771
150p
D771
1SS375
R773
6.8k
R772
1k
RFGV
C752
0.1
R753
220
Q751
2SC4081
R752
47k
C751
220p
L741
LS-516
C742
47p
C743
0.1
R742
47
Q741
2SK882
R741
R
V
-148
(4.7kB)
L731
LS-516
C734
47p
C735
0.1
R736
47
R735
470
C733
0.1
R733
470
C732
Q731
3SK126
R730
R734
4
5
3
1
2
UNF8
CTCV
W844
C850
0.1
IFOUT
VCC
OSCIN
BASE
COLECT
GND
BASE
BASE
IC841
TA4101F
1
2
3
4
C845
0.1
C846
0.0047
L841
100uH
C848
10
C847
0.0047
C849
0.047
C842
0.0047
R842
100
C844
0.1
C843
0.1
8
7
6
5
C851
100p
C841
0.0047
R841
470
R832
10k
-
+
8
9
10
IC811c
C828
100p
R831
1M
C827
0.0047
C826
0.1
R829
100k
R828
470k
R827
120k
8V
R826
100k
14
13
12
-
+
C824
0.0015
R825
82k
R830
2.2M
C825
0.1
C823
0.1
R824
82k
C822
0.039
R823
82k
R822
1M
R821
2.2M
C821
0.1
C815
10
R816
100
-
+
1
3
2
11
4
C814
0.1
IC811a
NJM2902V
R814
150k
R815
150k
C813
0.01
R812
39k
R813
10k
C812
0.01
C81
1
0.1
R81
1
10k
IC791
TA31136FN
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
OSCIN
OSCOUT
MIXOUT
VCC
IFIN
DEC
FILOUT
FILIN
MIXIN
GND
N-REC
N-DET
RSSI
IFOUT
QUAD
AFOUT
C799
220p
R795
150k
C800
220p
R797
1k
C797
0.0047
R796
3.3k
C801
0.1
C802
0.1
FI791
SFPC455E-
TC01
R794
330k
C798
0.01
C7
R780
470
C793
0.0047
C7
5V
T8V
DIN
C1141
0.47
R1
143
470k
R1
144
470k
IC1141
BU4052BCFV
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
Y0
Y2
Y
Y3
Y1
INH
VEE
VSS
VDD
X2
X1
X
X0
X3
A
B
RXS
C1
142
0.0047
R1
150
4.7k
C1
145
0.47
R1
145
4.7k
R1
146
470k
R1
147
470k
R1
148
470k
C1
143
10
D96S
MODS
R1141
47k
R1142
47k
D732
UMC3N
IC971
TC4W53FU
1
2
3
4
8
7
6
5
MINH
AMS
R971
10k
C971
0.0047
BFO
BFO
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
XIN
CE
CL
DI
LDB
LDA
CA
TEST
PDA2
PDA1
AIA
AOA
XOUT
PDB2
PDB1
AIA
AOB
OUTB
CB
VDD
PIB
VSS
PIA
OUTA
IC1011
LC715317
R1012
33k
C1012
0.1
R1013
15k
C1013
2.2
R1014
1.8M
C1011
0.0047
R1011
100
IFST
MCK
MOT
C1014
0.0047
C1015
0.0047
C1016
10
D101
1
MA2S1
1
1
L1012
100uH
CP1011
R1017
10k
C1017
0.1
C1018 1
R1019
2.2k
C1019
0.0047
R1020
470k
D1012
MA357
R1018
100k
C1020
68p
C1021
56p
C1022
20p
L1013
2.2uH
C1023
150p
D1014
1SS375
D1013
1SS375
R1023
100k
C1025
150p
C1024
150p
Q1011
2SK210
R1021
100
C1026
0.0047
R1024
150
L1014
10uH
Q1012
DTC114EE
C1027
10p
R1022
100k
C961
0.47
8V
R964
33k
R963
100
R965
220
Q961
2SC4081
C963
10
C982
0.1
R982
47k
R983
18k
C983
0.1
R984
15k
ET
ON
C984
0.1
R986
180k
R987
270
C985
0.1
-
+
2
3
1
R985
150k
IC981a
NJM2058M
4
11
R988
150k
R992
390k
T
ONE
C986
0.1
R991
680k
R990
270k
R989
150k
C987
0.001
R993
82k
C988
0.0022
R994
82k
C989
120p
-
+
6
5
IC981b
R995
1.2k
R999
R
V
-150
(10kB)
2F80
Q981
DTC114EE
R996
1k
R1004
10k
R1002
R
V
-148
(4.7kB)
R1003
68k
R1001
68k
AMS8
Q1041
DTC114EE
R1041
100
C1041
1
D1041
MA2S1
1
1
R1043
47k
R1045
RV-148
(4.7kB)
R1044
47k
R1049
1.2k
R1046
1k
R1047
1k
R1048
820
C1045
10
C1043
0.1
C1044
0.0047
L1041
100uH
C1046
0.1
R1051
8.2k
C2234
0.1
R1050 330
1
2
3
4
5
6
7
14
13
12
11
10
9
8
IC1041
NJM1496V
VS+
VCS
VCS
VS-
BIAS
VO+
NC
VEE
NC
VO-
NC
VCC-
NC
VCC+
C1052
0.1
C2233
0.1
C1053
10
C1048
C1047
10
L1042
100uH
R2244
R1052
330
D921
DAN222
C922
33
R1164
18k
C1162
0.1
R1163
15k
R1162
100k
C1161
0.47
R1161
100k
-
+
C1163
0.1
R1165
100k
13
12
14
R1166
330k
IC981d
C1
164
0.1
D1161
1SS385
R1167
100k
C1
165
0.1
R1
168
100k
R1
169
150k
R1
170
100k
+
-
8
10
9
IC981c
OVDV
2IF
C1381
0.0047
C1382
0.0047
C1391
0.0047
C1397
0.0047
C1410
0.0047
H5V
14V
HV
8V
5V
R8V
T8V
2IF
R781
100k
R774
1k
R751
470
C741
0.0047
C736
0.1
IC811d
R1016
47k
R1015
47
R967
1k
R966
3.9k
C964 1
R981
10
C981
10
R1000
560
R1042
R
V
-155
(150kB)
R845
56k
IC811b
R890
150k
R868
15k
D861
MA2S728
C1394
0.0047
8V
FMAF
R1031
10k
Q982
DTC114EE
R998
22k
R731
WCNT
• MAIN UNIT
MAIN (3)
MEASUREMENT CONDITIONS
SUPPLY VOLTAGE:13.8 V
14.1 MHz USB
DIGITAL MULTIMETER :50 k‰/V
3.2 V
1.9 V
5.8 V
6.1 V
4.0 V
0.8 V(FM)
6.6 V(FM)
4.3 V
3.4 V(FM)
6.3 V
4.3 V
3.7 V
4.4 V
4.4 V
COMPLETE VIEW
10 - 4
Summary of Contents for IC-706MKIIG
Page 1: ...SERVICE MANUAL HF VHF UHF ALL MODE TRANSCEIVER i706MK G ...
Page 58: ... HPF BOARD BOTTOM VIEW DRIVER BOARD BOTTOM VIEW 8 6 ...
Page 60: ... PA UNIT BOTTOM VIEW 8 8 ...
Page 62: ...1 8 16 9 PLL UNIT BOTTOM VIEW 8 10 ...
Page 64: ... FILTER BOARD BOTTOM VIEW 8 12 ...
Page 85: ...6 9 16 Kamihigashi Hirano ku Osaka 547 0002 Japan A 5564HI S C 1999 by Icom Inc ...