Icom IC-M304 Service Manual page 27

R56
Q5
KTC4075
10K
R58
10K
C84
0.022
IC3
C99
1 14
C97 V+ CAP
2 13 0.033
IN CAP R76
3 12
LOCK R
0.01
4 11 C100
GND LOOP 15K
5 10
Q REF
6 9
0.1
Q NC
C102
7 8
DATA FSK
R74 100K
0.01
NJM2211M
KTC4075
Q7
R69 R68
R73
33K 33K
47K
C93
0.0022
Q11 KTC4075
MP 1
4.29V 1922
C112
0.001
L21 L22
R83
2.7U
560 72.0N
R85
1K
KRC404
R86 D1 1
Q12
100 MA2S077
R87
33K
R212 R211
10 2.2K
1
2
3
4
5
6
7
8
9
J1
SP+ SP- 10
1 2
BEEP BPLVL
3 4
SQLV HVS
5 6
7 8
DSCENC
9 10
WXDE C RMUTE
11 12
DSCDEC PTTC
13 14
RCV PTT
15 16
SEND KEYM
17
18
TMUTE SQ L
19 20
TXDET SQLC
21 22
H/ L BPF
23 24
PSTB PCK
25 26
PDATA UNLK
27 28
R8
29 30
30FLT-SM2-TB
R:7.72V
To LOGIC UNIT
R8
R5
RSSI
R41
R42
68K
R55 R54
C82 470
10K 10K
0.1
JTB450C24
R44 C67
390
X1 100P
R43
1.5K
IC1
R:4.26V
R:3.62V
C73
R48
Q6
C90
C91 47K 220P R51
1.5K
0.022 0.022 C74
FI3
R62
220P O I
15K
LT450EW
R96
680
R102
C125
100
C128
Q15
1.5P
0.75P
2SC4215
Q13
2SC4226
C135
6P
C127
Q14
2SC4226
1.5P
5V
R204
C246
0.001 18
4.73V
L36
C243
68N
18P
Q26
C241
IC8
5P
20
VCC1 GND1 KTC4080
19
IN1 IN2
18
ENB VCC2
17
CLK XB
16
DATA XI
15
T1 XO
14
LOK GND2
13
CP1 CP2
12
X2
FI1 FI2
11
FO1 FO2
UPD3140GS
R184
47k
CR-804A
5V
HVS
KTA2015 KTA2015
KTA1664
Q35 Q33 Q31
R5 T5
Q36
Q32
Q34
R222
R224
KTC4075
1K 2.2K
KRC404
KRC404
R8
R:2.14V R:7.55V
C60
0.01
Q2
3SK13 1
Q4 FL-399A FL-368
FI 2 FI 1
KTC4080
R:2.37V
R38 C44 L13 L12
2.2K 0.001
0.1U 0.1U
T:4.78V
R:1.91V
3.84V
C149 L29
R:2.04V
47N
C138 10P
D17
22P
C140
MA2S077
Q16 Q17
150P
2SC4226
2SC4215
R188
47
IC10
8
V+
R:2.78V GND NJM4558M
4
IC10
R179 R178 R177 R174
NJM4558M
R180
5
82K 82K 68K 22K
7
27K C225
6
C233
120P
0.0039 R172
100K
IC9
O I
COM
KIA7805API
R21
100
MP 3
2685
LS-440
L8
C34 C30 C29 C24
2P 0.5P
4P
R:0.23V
R:0.42V
R:3.93V
R130
68
IC4
Hi :2.87V
Low:1.43V
KTA2015
R128
Q23
270
Q21
Q19
KRC404
R135
FMW1
R138
R140 KRC402
10K
Q20 R145 Q22 R137
10K
22 82
KRC404
D26
KRC404
Q25
R154
R153
1.2K 15K
DS12 2 K
LA4425A
C216
IC7
1
1 8
2 7
C220
3 6
4 5
0.22
TC7W66FU
R165
2.7K
11 - 2
• MAIN UNIT
L7
LS-440
R:3.48V
3P
C23
7P
LS-440
C16 L6
Q1 C1 3
3SK131
10P
5P
R9
100K R4
100K
RX LINE
TX LINE
COMMON LINE
DATA BUS
L32
L3
LW-25 LA-243
LA-253
ANT
L1
L31 D1 C6 L2
CP3
L308CCB 0.001 LA-243 LA-243 CP10S
C4
4P
CP10S
CP4
HV
CP10S
CP5
GND
SP+
CP6
CP10S
IC6
SP-
CP7
5
1
C213 CP10S
4
2
470
3
J2
R158 R151
PTT 1
1
2
M ICG
100
1 2
MIC 3
R159
3
GND 4
4
5
KEYM
1 5
S5B-PH-K- S
KEYM
W1
GND
1
SQL V SQLV
2
SQLI SQLI
3
HV
4
GND
5
VOL2
6
VOL1
7
HVS
8
OPC-1264A