![background image](http://html2.mh-extra.com/html/icom/ic-7851/ic-7851_servise-manual_4153040144.webp)
9-1
2.2K
R13
4.7K
R14
2.2K
R15
4.7K
R16
2.2K
R17
4.7K
R18
6.8K
R19
6.8K
R20
6.8K
R21
0.1
C1
0.1
C2
0.1
C3
2.2K
R22
4.7K
R23
15K
R24
2.2K
R25
4.7K
R26
6.8K
R27
6.8K
R28
0.1
C4
0.1
C5
0.1
C6
0.1
C7
0.1
C8
0.1
C9
15K
R29
0.1
C10
S21
LS8J2M
S11
LS8J2M
S7
LS8J2M
S8
LS8J2M
S12
LS8J2M
S13
LS8J2M
S14
LS8J2M
S15
LS8J2M
S16
LS8J2M
S1
LS8J2M
S17
LS8J2M
S2
LS8J2M
S18
LS8J2M
S3
LS8J2M
S19
LS8J2M
S4
LS8J2M
S20
LS8J2M
S5
LS8J2M
S6
LS8J2M
SML-512UW
DS15
SML-512DW
DS5
0.1
C11
0.1
C12
J3
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
31
32
33
34
35
36
37
38
39
40
SMLE13BC8T
DS6
B1931TX
DS7
B1931TX
DS11
B1931TX
DS8
B1931TX
DS10
B1931TX
DS9
B1931TX
DS12
B1931TX
DS13
B1931TX
DS14
B1931TX
DS16
B1931TX
DS17
1k
R1
1k
R2
1.8k
R3
820
R4
820
R6
820
R7
820
R8
820
R9
820
R10
820
R11
820
R5
820
R12
820
R30
1k
R36
1k
R37
SMLE13BC8T
DS18
SMLE13BC8T
DS19
J1
1
2
3
4
5
6
7
8
9
10
J2
1
2
3
4
5
6
7
8
9
10
J101
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
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
0
R102
1K
R104
1K
R103
J102
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
31
32
33
34
35
36
37
38
39
40
0
R101
J104
1
2
3
4
5
6
7
8
9
10
11
12
13
14
0.1
C104
J105
1
2
3
4
J106
1
2
3
4
GND
GND
GND
GND
GND
GND
GND
GND
TN1D
VOXD
PWRK
TN2D
SSQL
SAGL
KYSL
DELL
PWRD
MOND
MNRD1
MNBD
SAGD
KI9
KI7
KI11
KI10
KI9
KI8
KI7
STBD
TN1D
TN2D
TMD
MNBD
SNRD1
MAGD
SAGD
MNRD1
STBD
PWRD
VOXD
SNRD2
MNRD2
MOND
SSQL
SAGL
KYSL
DELL
MAGL
MIGL
MIGL
MSQL
MAGL
PWRL
MSQL
PWRL
TMD
MNRD2
SNRD1
SNBD
SNRD2
MAGD
H3R3V
H3R3V
H3R3V
KI8
STBV
SDBD
USBD
BRIV
CNTV
TRAK
SNBD
KI10
KI11
CNTV
BRIV
USBD
USBD
SDBD
SDBD
LDPS
LDPS
POWER SW
STBY LED
POWER ON LED
TUNING LED
TUNER LED
TRANSMIT SW
TIMER LED
TIMER SW
MAIN
MAIN
MAIN
SUB
SUB
SUB
VOX BK-IN SW
A
B
C
D
E
F
TUNER SW
AGCVR SW
NR SW
NB SW
AGCVR SW
NR SW
NB SW
G
MONI SW
LDPS
SBPS
BRIV
CNTV
G5
UD/RL
BRIV
GND
G1
GND
GND
GND
LVDD3
B5
GND
GND
GND
B3
G5
LVDD2
R3
LVDD4
B5
B2
LVDD3
B4
G2
B0
GND
R4
R2
NC
G0
G4
GND
G0
R0
R5
HS
R0
G2
R1
GND
GND
GND
LVDD4
VS
GND
NC
GND
GND
LVDD1
UD/RL
LVDD1
GND
R5
GND
G1
DE
DE
G3
G4
R3
GND
GND
G3
B2
B0
B3
GND
B1
LCLK
R2
VS
R1
LVDD2
CNTV
B1
LCLK
R4
GND
GND
HS
B4
SDCMD
SDCLK
VDD
SDCD
SDWP
SDDAT1
SDDAT2
SDDAT3
GND
SDDAT0
SDDAT2
GND
SDDAT0
SDDAT3
SDCLK
SDWP
SDDAT1
SDCD
GND
SDCMD
VDD
SPO
SPE
SPO
SPE
TO DISPLAY J1
TO DISPLAY J11
TO DISPLAY J2
TO LCD
TO MAIN J413
TO SPEAKER
0.01
C4
RV-317
R1
4.7K
R3
RV-317
R2
4.7K
R4
0.01
C2
4.7K
R5
0.01
C1
4.7K
R6
0.01
C3
J1
1
2
3
4
5
6
7
8
9
10
11
12
H3R3V
GND
GND
GND
GND
MSQL
MAGL
MIGL
PWRL
MIC/PWR VR
MAIN AGC/SQL VR
VR-A UNIT
VR-B UNIT
0.01
C4
4.7K
R6
0.01
C1
RV-317
R2
4.7K
R4
RV-317
R1
4.7K
R3
0.01
C3
0.01
C2
4.7K
R5
J1
1
2
3
4
5
6
7
8
9
10
11
12
H3R3V
GND
GND
GND
GND
SAGL
SSQL
DELL
KYSL
SUB AGC/SQL VR
KEY/DELAY VR
J1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
220
R2
220
R1
0.1
C1
J2
1
CD/DAT3
2
CMD
3
VSS1
4
VDD
5
CLK
6
VSS2
7
DAT0
8
DAT1
9
DAT2
CD1
CD2
WP1
WP2
14
17
10
C2
47k
R3
27
R5
27
R6
27
R7
27
R8
27
R9
27
R10
MPZ1608S601A
EP4
1.8k
R21
1.8k
R22
DS23
SMLA13BC8T
DS24
SMLA13BC8T
LDPS
USBD
SDBD
SD CARD
SDDAT2
SDDAT3
SDCMD
GND
VDD(3R3V)
SDCLK
GND
SDDAT0
SDDAT1
SDCD
SDWP
USB ACCESS LED
SD ACCESS LED
SD UNIT
SW-A UNIT
SN74LVC1G04DCK
IC201
1
2
3
4
5
0.01
C201
0.1
C202
100k
R201
0.01
C2
0.01
C3
4.7K
R6
4.7K
R4
0.01
C4
4.7K
R5
0.01
C1
RV-325
R2
4.7K
R3
RV-325
R1
J1
1
2
3
4
5
6
7
8
9
10
11
12
H3R3V
SRFL
SAFL
SNRL
SNBL
SUB NR/NB VR
SUB AF/RF VR
MPZ2012S601A
MPZ2012S601A
MPZ2012S601A
EP10
EP12
0.01
C3
EP19
0.01
C2
EP4
EP5
EP22
0.01
C1
EP7
4.7K
R6
EP14
4.7K
R4
EP8
EP18
J1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
EP9
RV-325
R2
EP13
EP17
EP6
RV-325
R1
EP3
4.7K
R3
EP2
4.7K
R5
0
R26
EP20
0.01
C4
J3
1
2
3
4
5
6
7
8
9
10
11
12
J4
1
2
3
4
5
6
7
8
9
10
11
12
J2
1
2
3
4
5
6
7
8
9
10
MPZ2012S601A
EP16
MICE
SQSS
MUDL
M8V
MICI
PHOM
PHOM
PHOS
PHOS
DOTK
DOTK
DSHK
DSHK
PHNI
PHNI
MNBL
AFO
PHE
PHE
MSND
MSND
MNRL
MAFL
MRFL
H3R3V
MAIN NR/NB VR
MAIN AF/RF VR
TO MAIN J198/J199
10
R1
10
R2
MPZ1608S221A
EP1
MPZ1608S221A
EP2
MPZ1608S221A
EP3
MMZ1608Y102BT
EP102
MMZ1608Y102BT
EP101
0.01
C3
0.01
C2
0.01
C102
0.01
C1
0.01
C101
100U
L4
100U
L6
100U
L5
100U
L102
100U
L101
100U
L103
0
R4
J1
1
2
3
4
5
6
7
8
9
10
11
12
J2
J103
PHOM
PHE
PHE
PHE
PHOS
PHI
DASH
GND
GND
DOT
PHONE-J
VR-D UNIT
VR-C UNIT
VR-E UNIT
ELEC-KEY-J
MMZ1608Y102BT EP11
MMZ1608Y102BT EP2
MMZ1608Y102BT EP3
MMZ1608Y102BT EP4
MMZ1608Y102BT EP5
MMZ1608D301B
EP9
MMZ1608D301B
EP10
47P
C8
100P
C4
0.01
C3
0.01
C2
0.01
C5
0.01
C6
0.01
C7
0.01
C1
J2
1
2
3
4
5
6
7
8
9
10
MPZ1608S221A
EP12
100U
L3
100U
L2
100U
L1
100U
L4
0
R6
MPZ2012S601A
EP7
MPZ2012S601A
MIC UNIT
JACK UNIT
EP8
J1
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
SQSS
MUDL
MICI
M8V
AFO
MICE
MSND
J1
1
2
3
4
5
6
7
8
9
10
11
12
DS1
SML-A12UT
DS2
SML-A12MT
DS3
SML-A12WT
DS5
SML-A12UT
DS6
DS7
SML-A12WT
SML-A12WT
DS4
SMLA12WBC7W
2.2k
R1
1.2k
R2
1.8k
R3
1.8k
R7
1.2k
R6
2.2k
R5
1k
R4
LDPS
MTXD
MLCD
STXD
SLCD
SRXD
MRXD
SPLD
MAIN TX
MAIN RX
MAIN LOCK
SPLIT
SUB RX
SUB TX
LED UNIT
SUB LOCK
S3
LS8J2M
S4
LS8J2M
S5
LS8J2M
S6
LS8J2M
S7
LS8J2M
S8
LS8J2M
S9
LS8J2M
S10
LS8J2M
S11
LS8J2M
S12
LS8J2M
S13
LS8J2M
S14
LS8J2M
S15
LS8J2M
S16
LS8J2M
S17
LS8J2M
S1
LS8J2M
S2
LS8J2M
J1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
F2K
F3K
F4K
F5K
F6K
F7K
MATK
SW-B UNIT
PLYK
RECK
F1K
GND
F1K
F2K
F3K
F4K
F5K
F6K
F7K
SSBK
SSBK
CWK
RTYK
AMK
DATK
MSCK
EXTK
CWK
RTYK
AMK
DATK
MSCK
EXTK
RECK
PLYK
MATK
F-1
F-2
F-3
F-4
F-5
F-6
F-7
SSB
CW
RTTY/PSK
AM/FM
DATA
M.SCOPE
EXIT/SET
REC
PLAY
AUTO TUNE MAIN
TO DISPLAY J9
4.7K
R14
4.7K
R11
0.01
C15
0.01
C12
4.7K
R13
4.7K
R17
4.7K
R16
4.7K
R15
0.01
C14
0.01
C11
0.01
C16
4.7K
R12
0.01
C17
0.01
C13
J1
1
2
3
4
5
6
7
8
9
10
11
12
RK097111T005A
R1
RK097111T005A
R5
RK097111T005A
R6
RK097111T005A
R7
RK097111T005A
R2
RK097111T005A
R3
RK097111T005A
R4
H3R3V
H3R3V
BRIL
CNTL
AVXL
VOXL
MONL
DRVL
GND
GND
CMPL
ANTI VOX
CONTRAST
BRIGHT
MONI GAIN
COMP
VOX GAIN
DRIVE
TO DISPLAY J8
TO DISPLAY J3
SECTION 9. VOLTAGE
DIAGRAM
*:
Refer to the PARTS LIST for the value and name of component.