Icom IC-7851 Servise Manual page 146

TO DISPLAY J4
TO DISPLAY J5
S2
LS8J2M
CLEAR R2
4.7K
S13 SUB FILTER
LS8J2M
R13
2.2K
DS52
B1931TX
S4
LS8J2M
S15 S14
LS8J2M LS8J2M
SPLIT R14
4.7K
SUB PBT CL
DUAL WATCH
KI0
CLEAR 0V
DUAL WATCH 0.8V
DS54
B1931TX
SPRIT 1.6V
No input 3.2V
S6
LS8J2M
R6
4.7K
SUB DIGI-SEL
SW-C UNIT
Measurement condition:
DS56
B1931TX
Frequency: 14.1 MHz
Mode: USB
* No signal is received.
* No modulation on transmitting. S8
LS8J2M
Range Input impedance
200mV 100 MΩ
2V 11 MΩ
SUB APF/TPF
20V,200V,1000V 10 MΩ
RX
Unit：V
DS58
B1931TX
STSK MTSK
S16 S10
S17
LS8J2M LS8J2M
LS8J2M
MAIN TS R10
SUB TS
4.7K
SSPK
MSPK SUB NOTCH
S19
S18
LS8J2M
LS8J2M
SUB SPEECH
MAIN SPEECH
SLCK MLCK
S21 S22 S20
LS8J2M LS8J2M LS8J2M
SUB LOCK
MAIN LOCK
SUB AUTO TUNE
KI3
MAIN FILTER 0V
SUB FILTER 0.8V
S1
LS8J2M
MAIN PBT 1.6V
SUB PBT 2.5V
No input 3.2V
R1
2.2K
KI2
MAIN FILTER
MAIN DIGI-SEL 0V
SUB DIGI-SEL 0.8V
MAIN APF/TPF 1.6V
SUB APF/TPF 2.5V
DS51
No input
3.2V
B1931TX
On push 0V
No push 3.3V
J1
S3
H3R3V
30
LS8J2M
KI3
29
KI2
28
KI1
27
KI0
R3 26
MTSK
25
15K STSK
24
MSPK
23
MAIN PBT CL SSPK
22
MLCK
21
SLCK
20
SATK
19
18
17
MPCD
16
SPCD
15
MAPD
14
DS53
SAPD
13
B1931TX
MDGD
12
SDGD
11
MNCD
10
SNCD
9
LDPS
8
S5 PITL
7
LS8J2M
SAPL
6
SNCL
5
SP2B
4
SP2A
R5 3
SP1B
2
SP1A
2.2K 1
MAIN DIGI-SEL
DS55
B1931TX
S7
J2 J1
LS8J2M
SP1A SP1A
1 10
SP1B
SP1B
2 9
SP2A SP2A
3 8
R7 SP2B
4 7
GND GND
5
6
15K GND GND
6 5
SNCL SNCL
MAIN APF/TPF 7 4
SAPL SAPL
8 3
PITL PITL
9 2
H3R3V H3R3V
10
1
DS57
B1931TX
PBT2 UNIT
S9
LS8J2M
R9
2.2K
MAIN NOTCH
KI1
MAIN TWIN PBT
MAIN NOTCH 0V
SUB NOTCH 0.8V
S11
LS8J2M
RIT 1.6V
⊿TX 2.5V
R11
No input 3.2V
15K
RIT
MAIN APF/NOTCH VR
S12
LS8J2M
dTX
PBT1 UNIT
9-3
TO SUB-SENSOR TO RIT-SENSOR
5 6 5
J1
H3R3V
1
KI6
2
KI5
3
KI4
4
GND
5
GND
6
SSA
7
8
RSA
9
RSB
10
11
UPK
12
13
14
15
MWK
16
17
18
19
EQRK
20
21
22
23
LDAT
24
LCK
25
LOE
26
LST1
27
28
29
30
J2
H5V
1
2
TKYD1
3
TKYD2
4
TKYD3
5
TKYD4
6
MDGL
7
MNCL
8
MP2B
9
MP2A
10
MP1B
11
MP1A
12
SP1A
13
SP1B
14
SP2A
15
SP2B
16
SNCL
17
SAPL
18
PITL
19
SATK
20
SLCK
21
MLCK
22
SSPK
23
MSPK
24
STSK
S1
25
2 MTSK
26
A
KI0
3
27
B
1 KI1
COM 28
KI2
29
5 KI3
A 30
6
B
4
COM
TP90D96E20 J3
R1 H3R3V
1
KI3
R3 2
KI2
3
4.7K
KI1
4
KI0
5
MTSK
R4 SUB APF/NOTCH VR
6
STSK
7
4.7K MSPK
8
SSPK
9
RV-319
MLCK
10
SLCK
11
R2 SATK
12
GND
13
R5
14
CW PITCH VR
MPCD
4.7K 15
SPCD
RV-318 16
MAPD
17
SAPD
18
MDGD
19
SDGD
20
MNCD
21
SNCD
22
23
PITL
24
SAPL
S1 25
SNCL
2
26
A
SP2B
3
27
B
SP2A
1 28
COM SP1B
29
SP1A
5 MP1A 30
A
6 MP1B
B
4
COM
TP90D96E20
J1 J4
MP1A
R1 10
1
MP1B
9
R2 2
MP2A MP2A
8
3
4.7K MP2B MP2B
7
4
GND GND
6
5
GND
5 GND
R3 6
GND
4 GND
7
MNCL
4.7K 3 MNCL
8
MAPL
2 MDGL
9
H3R3V
1 H3R3V
RV-319
10
TENKEY UNIT
6
DS51
R51
820 B1931TX
1.8(1)
DS53
R53
820 B1931TX
LDAT
LCK
LOE
LST1
10(4)
On push 0V
No push 3.2V
DS55
R55
TKYD1
820 B1931TX
TKYD2
TKYD3
TKYD4
21(7)
DS57
R57
820 B1931TX
GENT(.)
TKYD1
TKYD2
TKYD3
TKYD4
SUBD1
SUBD2
MIND1
MIND2
LDPS
MPCD
UP V/M
SPCD
MAPD
SAPD
MDGD
SDGD
MNCD
SNCD
DOWN MP-W
MIND1
MIND2
R75 DS1
820 B1931TX
R77 DS3
1k SMLE13BC8T
MINK
MAIN
EQRK
XFC
M=S
*: Refer to the PARTS LIST for the value and name of component.
Key KI6
1.8 0V
10 0.8V
21 1.6V
GENT 2.5V
No input 3.2V
DS59 DS67
R67
R59
820 B1931TX 820 B1931TX
Key KI5
3.5 0V
14 0.8V
3.5(2) 7(3) 24 1.6V
50 2.5V
DS69 No input 3.2V
DS61
R61 R69
820 B1931TX 820 B1931TX
Key KI4
7 0V
18 0.8V
28 1.6V
14(5) 18(6)
F-INP 2.5V
No input 3.2V
DS63 DS71
R63 R71
820 B1931TX 820 B1931TX
24(8) 28(9)
DS73
R65 R73
DS65
820 B1931TX 820 B1931TX
50(0) F-INP(ENT)
LOE
C5
0.1
IC1
1 20
VSS VDD
2 19 LOE
NC OE
LDAT 3 18
MW
DATA SO
4 17
LCK MIND2
CLOCK Q11
5 16
LST1 SUBD2
LCK Q10
MPCD 6 15 MIND1
Q0 Q9
SPCD 7 14 SUBD1
Q1 Q8
MDGD 8 13 SNCD
Q2 Q7
SDGD 9 12 MNCD
Q3 Q6
MAPD 10 11 SAPD
Q4 Q5
MP-R BU2099FV
SUBD1
SUBD2
R76 DS2
820 B1931TX
R78 DS4
Light ON 0.3V
1k SMLE13BC8T Light OFF 5.2V
SUBK
SUB
CHGK
CHANGE