Icom IC-M803 Service Manual page 69

• MAIN UNIT (1/9)
Explanatory notes
TX Line
RX Line
Voltage Line
R4024
33K
2
IC4021
R4025
1 R4028
3
330
R4029
NJM2904CRB1
R4038 R4041
33K
IC4021
6
R4039
7 R4042
5
330
R4043
NJM2904CRB1
TO FILTER UNIT
J4001
GND 16
FOR 15
GND 14
REF 13
GND 12
R4001
FL1M 11
R4002 10
FL2M 10
R4003 10
FL3M 9
R4004 10
FL4M 8
R4005 10
FL5M 7
R4006 10
FL6M 6
R4007 10
FL7M 5
R4008 10
FL8M 4
R4009 10
FL9M 3
R4010 10
FL10M 2
R4011 10
S13V 1
10
TO CONNECT UNIT
J4051
14V EP4051 14V
30
NC
29 MPZ1608S101A
GND GND
28
DSEN DSEN
27
DSAF DSAF
26 DSAF
DSAFE DSAFE
DSAFE
25
MAIN UNIT(8/9)
DSMD DSMD
24 DSMD
DSMDE DSMDE
23 DSMDE
GND GND
22
GND GND
21
GND GND
20 DSEN
GRX GRX
19 GRX
MAIN UNIT(5/9)
GTX GTX
18 GTX
GRESL GRESL
17
GRESL
GND GND
16
H3R3V EP4052 H3R3V
15
EP4053 MPZ1608S101A A5V
A5V
14
MPZ1608S601A
GND GND
13
GND GND
12
GND GND
11
GND GND
10
RPC RPC R4051
9
R4052
DTR DTR 220
8
NMR NMR R4053 220
7
RNMEO RNMEO R4054 220
6
R4055
RSS RSS 220
5
DNMEI DNMEI R4056 220
4
RNMEI RNMEI R4057 220
3
GND GND 220 C4051
2
GND GND 0.1
1
IC4051
1 8
2 7
3 6
4 5
TO PA UNIT
TC7WH14FK
J4071
PON L4071 100U
30
PHV EP4074 MPZ2012S101A
29
PHV
28
P14V
27
P14V
26
P14V
25
EP4073
P14V
24 MPZ2012S101A
P14V
23
P14V
22
P14V
21
KEYS KEYS R4074 1K
20
STAT STAT R4071 4.7
19
ANTC
18
GND
17
GND
16
GND
15
GND
14
GND
13
P8V L4076 100U
12
8V
PDICL EP4072 R4082 1K
11
PFANV MMZ1608Y102BT L4072 100U
10
PPID1V R4075 220
9
PDID1V R4076 220
8
PDID2V R4077 220
7
PFID1V R4078 220
6
PFID2V R4079 220
5
PFID3V R4080 220
4
PFID4V R4081 220
3
THRM THRM L4075 100U
2
PFICL EP4071 R4072 1K
1
MMZ1608Y102BT
REFLP
MAIN UNIT(9/9)
D4023
FORLP
LRB706F
D4024 8
IC4022
2 V+
D4021 R4031
1 GND
3 4
L1SS400 47
10K
LRB706F
NJM2904CRB1
18K
R4044
47K 33k
6 IC4022
D4035 R4046
7
5
L1SS400 100
4.7K
NJM2904CRB1
15K
IC4001
EP4001 MPZ1608S601A
GND VCC
10 9
O8 I8
11 8
O7 I7
12 7
O6 I6
13 6
O5 I5
14 5
O4 I4
15 4
O3 I3
16 3
O2 I2
17 2
O1 I1
18 1
62783G
C4012
0.1
IC4002
EP4002 MPZ1608S601A
GND VCC
10 9
O8 I8
11 8
O7 I7
12 7
O6 I6
13 6
O5 I5
14 5
O4 I4
15 4
O3 I3
16 3
O2 I2
17 2
O1 I1
18 1
62783G
Q4022
C4013
0.1 LDTC143ZE
Q4021
LDTA114YE
IC4061
5 Q4023
1 OUT
CD
2 VDD LDTC143ZE
3 VSS 4
NC
S-80845CNMC
Q4062
R4064
Q4063
LDTA114YE
22K TPCF8107
Q4061
L2SC4081
A5V
14V
H3R3V
RXPC
DTRM
NMRS
D4071
RNMEAO MAIN UNIT(5/9)
DNMEAI
RNMEAI
LRB706F
R4083
1K
IC4071
1 8
2 7
EKEY
D4072
3 6
A5V 4 5 TCON
TC7WH14FK
PWRSR MAIN UNIT(5/9)
C4091
LRB706F
R4086
0.1
1K
R4087
1M
Q4071
LDTC143ZE
ESTA
ESTA
MAIN UNIT(5/9)
Q4072
LDTA114YE
8V
R4093
82k
82k
R4092
13
R4091
14
DRIV
R4090
12
PDIDV 100
DID1V 47k
IC4072
DID2V
NJM3403AV
FID1V
FID2V
FID3V
FID4V
8
V+
GND
4
FORL
REFL
14V
KEYIN
MAIN UNIT(5/9)
ASENI
TRAS
L1S
L2S
CP4141
AMOD
L3S
AGND
SHORT1005
L4S MAIN UNIT(8/9)
AAF
CP4142
L5S
AAFE
SHORT1005
L6S
3.2
L7S
0
L8S
L9S
L10S
14V
Q4161
LDTA114YE
TXS
RPPS
LTXD
MAIN UNIT(5/9)
LRXD
HV
HV
MPZ2012S601A
A5V
EP4181 EP4182 EP4183
14V
MPZ2012S601A
MPZ2012S601A
H3R3V
AFE
3R3V
AFO
3R3V
MAIN UNIT(8/9)
FMODG
FMOD
EKEY
H3R3V
MAIN UNIT(5/9)
H3R3V
HV
TCON
HV
R4110
14V
100 100k
4
V+ IC4072
R4113
GND NJM3403AV
11
3R3V
3R3V
H3R3V
MAIN UNIT(5/9) FANV
8V
R4101
47K
Q4073
L2SC4081
R4102
PFIDL
47K
R4094
THML MAIN UNIT(5/9)
1K
MAIN UNIT(3/9)
DRIVE
11-3
HV
14V
8V
A5V
H3R3V
3R3V
Measuring condition:
• Frequency: 12.23 MHz
• Mode: J3E (USB)
• RX: No signal is received.
• TX: No modulation signal is applied.
• Waveforms are measured by
an oscilloscope.
Voltage notation:
RX
R4147
4.7K
L2SC4081
Q4142 D4142
R4148
47K
L1SS400
MPZ2012S101A
EP4141
14V
L4144
100U
L2SC4081
Q4141
R4143
D4141
33K L1SS400
2SCR553P5
Q4162
R4161
0
150
6.8
0.7
0
EP4185
MPZ2012S331A
EP4192
MPZ2012S331A
R4182 L4182
MPZ2012S601A
R4183 470 L4183 220U
EP4184
470 220U
HV
EP4188
MPZ2012S331A
EP4190 MMZ1005S601CT
EP4191 MMZ1005S601CT
R4114
390k
IC4072
9
R4116
8
10 D4102
220
NJM3403AV
D4101
LRB706F
IC4072
2 D4103
R4105
1
3
LRB706F
1K
NJM3403AV
LRB706F
R4109
VDL
IC4072
6 1K DIDL
R4106
7
FIDL
5
1K
NJM3403AV
HV
14V
8V
MAIN UNIT(2/9)
A5V
H3R3V
3R3V
(unless otherwise noted)
TX
Unit: Volt
RX
EALC MAIN UNIT(9/9)
J4141
6 NC
13.6V 7
7 6
CWK 1
8
EALC
[ACC]
SEND 3
3 8 1
AMOD 4
2
AGND
AAF 5
5 4
2
J4161
SPO
[EXT-SP]
SPE
J4181
GND
10
9 RXD
TXD
8
HV
7
6 HV
FAFG TO LOGIC UNIT
5
FAF
4
3 GND
FMODG
2
FMOD
1
FORL
FORL
REFL
REFL
L1S
L1S
L2S
L2S
L3S
L3S
L4S
L4S
L5S
MAIN UNIT(5/9)
L5S
L6S
L6S
L7S
L7S
L8S
L8S
L9S
L9S
L10S
L10S
TXS
TXS
RPPS
RPPS
VDL
DIDL
MAIN UNIT(5/9)
FIDL
PFIDL
MAIN UNIT(9/9)