![background image](http://html2.mh-extra.com/html/icom/ic-7851/ic-7851_servise-manual_4153040168.webp)
9-25
LR-317
L301
10K
R61
SFILW
10K
R71
10K
R211
LDTC114EE
Q211
10K
R215
SHSK0
10K
R213
SHSK1
CASE-BM7H
EP211
1
2
10K
R214
10K
R212
2577 RX-VCO CASE
MP471
1
2
3
4
10U
L311
10
C311
CASE-BM7H
EP213
1
2
CASE-BM7H
EP215
1
2
8P
C223
8P
C221
CASE-BM7H
EP217
1
2
8P
C217
SCK
8P
C215
SDAT
J1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
SSTB1
LDTC114EE
Q61
SSTB2
LDTC114EE
Q71
LQW18ANR15G00D
L483
270
R201
100
R6
100
R13
LDTC114EE
Q51
LDTC114EE
Q52
100
R8
100
R12
39P
C82
100
R11
39P
C84
0.01
C43
56P
C86
120P
C471
120P
C83
100
R14
51P
C473
0.01
C57
220P
C85
1K
R43
47P
C475
68P
C477
56
R91
56P
C472
0.001
C54
120P
C474
390P
C476
68N
L172
0.12U
L85
0.001
C53
0.15U
L86
39P
C88
22P
C90
10U
L41
6P
C92
S3IF+
75P
C89
82P
C91
DRESD
100
R9
+5V
51P
C93
0.01
C47
100
R7
27P
C486
330
R237
SDSPCK
1K
R47
56P
C485
330
R236
56P
C487
15
R235
10U
L42
FRWT
0.01
C61
150
R45
18
R202
0.01
C55
3.3K
R94
100
R92
0.001
C63
SDSPCX
1K
R93
150
R319
0.001
C62
0.001
C69
100
R10
1.5U
L215
0.01
C71
47
R318
0.001
C72
0.001
C78
270
R203
1.5U
L211
1K
R317
0.01
C81
0.001
C73
SDSPCR
0.001
C79
0.001
C60
1.2U
L216
0.001
C68
LR-517A
L92
1.2U
L212
0.001
C229
1.8U
L217
0.01
C97
SDSPX
150
R41
1.8U
L213
0.01
C99
0.001
C230
1U
L218
10K
R316
+3R3VA
FL-455
FI211
1
IN
2
OUT
3
GND
4
GND
5
6
1U
L214
SDSPR
7P
C219
15P
C222
7P
C220
15P
C218
0.0015
C316
FL-442
FI212
1
IN
2
OUT
3
GND
4
GND
5
6
1
C315
0.001
C211
10
C313
0.001
C212
2.5P
C216
2.5P
C224
1
C314
MPZ2012S601A
EP3
LDTC114EE
Q41
LDTC114EE
Q43
MPZ1608S601A
EP4
10K
R44
10K
R48
15
R313
TS462CPT
IC311
1
2
3
4
5
6
7
8
220
R42
330
R233
220
R46
330
R232
15
R231
0.001
C58
J11
J12
0.01
C96
0.01
C94
0.01
C48
10K
R52
J13
MT3S20P
Q91
0.01
C44
10K
R56
0.01
C41
2177 D/A CASE
MP301
1
2
3
4
10K
R55
0.01
C45
6.8K
R54
10K
R66
1SS390
D41
0.01
C231
1SS390
D42
0.01
C225
10K
R51
SSA
0.01
C226
10K
R67
SSB
0.01
C214
10K
R62
ATT10
0.01
C213
10K
R68
ATT20
0.01
C232
2177 D/A CASE
MP201
1
2
3
4
10K
R76
2577 RX-VCO CASE
MP81
1
2
3
4
0.01
C234
LR-317
L201
10K
R72
0.01
C235
LR-317
L202
10K
R77
LR-317
L302
10K
R78
5P
C95
10K
R311
10K
R312
0.01
C98
10 CE-LH
C31
0.1
C33
0.1
C32
MPZ2012S601A
EP5
MPZ2012S601A
EP21
MPZ2012S601A
EP22
100
R21
100
R22
100
R23
100
R24
100
R25
100
R1
100
R3
100
R4
100
R5
100
R2
0.1
C144
MMZ1608Y102BT
EP134
HMC832LP6GE
IC101
1
AVDD
2
NC
3
VPPCP
4
CP
5
NC
6
NC
7
VDDLS
8
NC
9
NC
10
RVDD
11
NC
12
NC
13
NC
14
NC
15
XREFP
16
DVDD
17
CEN
18
NC
19
NC
20
NC
21
NC
22
NC
23
VTUNE
24
NC
25
VCC2
26
NC
27
VCC1
28
RF_N
29
RF_P
30
SEN
31
SDI
32
SCK
33
LD/SD0
34
NC
35
VCCHF
36
VCCPS
37
NC
38
NC
39
VCCPD
40
BIAS
41
390
R118
0.1
C113
10K
R153
0.1
C141
100
R115
0.82U
L112
100K
R132
10
C151
75P
C116
MMZ1608Y102BT
EP131
6.8K
R114
0.01
C118
RZR040P01
Q152
0.1
C112
22K
R116
1K
R117
240P
C115
47
R134
22K
R151
270P
C117
0.1
C140
SN74AHC1G08DCK3
IC132
1
2
3
4
5
MMZ1608Y102BT
EP133
0.1
C111
LDTC114EE
Q151
0.1
C138
47
R136
68P
C114
10
C143
1K
R152
0
R133
SKY13350
IC52
1
VCTL1
2
OUT1
3
GND
4
OUT2
5
VCTL2
6
IN
SKY13350
IC212
1
VCTL1
2
OUT1
3
GND
4
OUT2
5
VCTL2
6
IN
2SK3018
Q42
2SK3018
Q44
82N
L84
/CAL
0.1
C1
0.1
C3
0.1
C5
L2SC4081
Q111
J21
1
2
3
4
5
6
7
8
9
10
11
12
0.01
C65
27
R64
27
R63
39
R65
0.01
C64
0.01
C67
SKY13350
IC61
1
VCTL1
2
OUT1
3
GND
4
OUT2
5
VCTL2
6
IN
SKY13350
IC62
1
VCTL1
2
OUT1
3
GND
4
OUT2
5
VCTL2
6
IN
0.01
C75
10
R75
0.01
C74
0.01
C76
39
R74
39
R73
SKY13350
IC211
1
VCTL1
2
OUT1
3
GND
4
OUT2
5
VCTL2
6
IN
MMZ1608Y102BT
EP132
0.1
C132
10
C131
10
C133
22P
C134
0.1
C136
0.1
C137
0.1
C135
0.1
C147
0.1
C146
22P
C145
0.001
C227
0.001
C228
J101
1K
R417
6.8K
R414
270P
C417
75P
C416
240P
C415
0.1
C411
0.01
C418
390
R418
L2SC4081
Q411
0.1
C412
0.82U
L412
100
R415
0.1
C413
68P
C414
22K
R416
22P
C445
MMZ1608Y102BT
EP433
10
C443
MMZ1608Y102BT
EP434
HMC832LP6GE
IC401
1
AVDD
2
NC
3
VPPCP
4
CP
5
NC
6
NC
7
VDDLS
8
NC
9
NC
10
RVDD
11
NC
12
NC
13
NC
14
NC
15
XREFP
16
DVDD
17
CEN
18
NC
19
NC
20
NC
21
NC
22
NC
23
VTUNE
24
NC
25
VCC2
26
NC
27
VCC1
28
RF_N
29
RF_P
30
SEN
31
SDI
32
SCK
33
LD/SD0
34
NC
35
VCCHF
36
VCCPS
37
NC
38
NC
39
VCCPD
40
BIAS
41
0.1
C446
10
C451
LDTC114EE
Q451
0
R432
0.1
C432
MMZ1608Y102BT
EP432
0.1
C447
10K
R453
0.1
C438
0.1
C435
0.1
C441
0.1
C437
0.1
C436
100K
R431
47
R433
0.1
C440
10
C433
SN74AHC1G08DCK3
IC432
1
2
3
4
5
47
R435
0.1
C444
MMZ1608Y102BT
EP431
RZR040P01
Q452
22K
R451
1K
R452
22P
C434
10
C431
0.001
C66
0.001
C70
0.001
C80
0.001
C77
100 CE-LH
C34
0.1
C21
0.1
C22
2177 D/A CASE
MP171
1
2
3
4
0.1
C4
SKY13350
IC51
1
VCTL1
2
OUT1
3
GND
4
OUT2
5
VCTL2
6
IN
SKY13350
IC71
1
VCTL1
2
OUT1
3
GND
4
OUT2
5
VCTL2
6
IN
SKY13350
IC72
1
VCTL1
2
OUT1
3
GND
4
OUT2
5
VCTL2
6
IN
0.001
C51
0.001
C46
0.001
C56
0.001
C42
0.001
C52
0.001
C59
1K
R53
1K
R57
0.001
C142
0.001
C442
0.12U
L81
0.1U
L82
0.1U
L83
30P
C87
10U
L91
10U
L94
10U
L93
3.3U
L111
3.3U
L411
0.33U
L471
0.18U
L472
0.15U
L473
BGA616
IC231
1
IN
2
GND
3
OUT
4
GND
0.01
C233
1U
L231
100
R434
100
R137
100
R139
100
R135
100
R438
100
R436
47K
R140
47K
R440
0.1
C419
MPZ2012S221A
EP1
SN74AHC1G08DCK3
IC133
1
2
3
4
5
SN74AHC1G08DCK3
IC433
1
2
3
4
5
0.1
C148
0.1
C448
47K
R141
47K
R441
MMZ1608Y102BT
EP135
MMZ1608Y102BT
EP435
0.1U
L181
82P
C182
100U
L22
100 CE-LH
C23
12
R36
12
R37
BA033FP
IC36
I
O
G
10 CE-LH
C36
100 CE-LH
C39
0.1
C37
0.1
C38
NJM7805DL1A
IC31
I
O
G
5.6
R177
820
R176
820
R178
10K
R314
0.001
C312
270
R101
270
R103
18
R102
18
R104
33
R111
68
R112
18
R113
0.1
C119
33
R411
18
R413
68
R412
33P
C139
33P
C149
82N
L141
BGA616
IC171
1
IN
2
GND
3
OUT
4
GND
0.01
C173
150
R171
150
R173
39
R172
0.01
C171
0.01
C172
39
R482
0.01
C481
BGA616
IC481
1
IN
2
GND
3
OUT
4
GND
0.01
C482
150
R481
150
R483
0.01
C483
5.6
R492
820
R491
820
R493
18
R420
18
R120
270
R121
270
R119
270
R419
270
R421
0
R439
HSMS-2829
D301
1
3
4
2
5.6K
R315
15
R234
15
R484
15
R174
1U
L481
1U
L171
HSMS-2829
D201
3
4
2
3615
MP101
1
2
3
4
3615
MP401
1
2
3
4
47 F93
C152
47U
L151
47U
L451
47 F93
C452
1.8K
R161
1.8K
R162
2.2K
R163
68P
C161
39P
C162
0.0056
C164
100P
C165
1.8K
R461
1.8K
R462
2.2K
R463
68P
C461
39P
C462
100P
C465
0.0056
C464
100P
C150
100P
C155
MMZ1608S601A
EP136
MMZ1608S601A
EP436
100P
C450
100P
C455
0.1U
L191
82P
C191
82P
C192
68N
L142
27P
C153
27P
C154
47P
C176
47P
C178
2.7
R31
SCK
SSTB2
SSTB1
SDSPCK
SDSPR
SHSK1
SDSPCX
SDSPCR
SDSPX
FRWT
DRESD
FRWT
SHSK0
SDSPX
SDSPCK
SDSPR
SDSPCX
SHSK0
SHSK1
SDSPCR
OCS
ODAT
OCK
OCS
OCK
OSS1
OSS2
ODAT
ATT20
SFILW
ATT10
SSA
SSB
SDAT
/CAL
/CAL
SSA
SSA
SSB
SSB
SFILW
ATT10
ATT20
OSS2
OSS1
DRESD
SSTB2
SCK
SCK
+8V
SSTB1
SDAT
/CAL
SDAT
[SCP_IFA]
SCOPE UNIT (SCOPE-1)
SCOPE-2
T8V
SHSK0
FRWT
SDSPCR
SDSPR
DRESD
+3R3V
H15V
+8V
ODAT
OSS2
H15V
+8V
GND
OCS
ODAT
OCK
OSS1
OSS2
+3R3V
+8V
+5V
+5V
+8V
+3R3V
+3R3V
T8V
10MHz
10MHz
SHSK1
+3R3V
SDSPX
SDSPCK
OCS
OSS1
H15V
SDSPCX
+8V
OCK
/CAL
/CAL
TO RF-A J1051
[SCP_IFB]
TO RF-B J1051
[SCPT]
TO MAIN J1131
TO LOGIC J1101
TO OSC J2016
TO OSC J1201
[SREF]
3.2
1.9
1.5
3.3
5.0
7.8
0.0
3.2
7.7
14.9
SOPE MAIN selected in RX
3.0 V
SOPE SUB selected in RX
3.0 V
3.2
SCOPE ATT ATT10 ATT20
0 dB
10 dB
20 dB
30 dB
3.0 V
3.0 V
3.0 V
0.0 V
0.0 V
3.0 V
0.0 V
0.0 V
5.0
SFILW
3.2 V
0.0 V
0.0 V
MODE
CENTER mode
SPAN
:
±2.5 k
〜
5.0 k
CENTER mode
SPAN
:
±10 k
〜
500 k
FIX mode
*:
Refer to the PARTS LIST for the value and name of component.