Icom IC-M424 Service Manual page 31

SECTION 10. VOLTAGE DIAGRAM
• LOGIC UNIT
JTMS
JTCK
JTDI
CLOTXD
CLORXD
R8
DTEST
3.3M
R12
C21
L3V PONO
22
C22
GND T5VSO
21 0.33
VLCD TXMSO
2.2 ESVA
20
VB1+ RVSO
19
VB1-
18
VB0- 100
17
C23
VB0+
16
GND
2.2 ESVA
15
VDD
14
DB7
13
DB6 RINTM
12
DB5
11
DB4 CD
10
DB3 CS
9
DB2 RESETB
8
DB1
7
DB0 JTDO
6
VDD NJRST
5
WR0
4 R16
CD UNLKI
3
RESETB
1K
2
CS
1
J5
R9
100K
L3V
BACKLIGHT
MAX(7):7.10V
MIN(1):3.44V
OFF(0):0V
2SB1201
Q1
CP27 R41
LEDV VCC
27
BACKLIGHT
MAX(7):0.852V
MIN(1):0.448V
OFF(0):0V
L2SC4081
Q2
CP28 R42
220K
L3V
IC9
1 8
A0 VCC
2 7
A1 WP
3 6
A2 SCL
4 5
VSS SDA
BR24T256FJ
CP19
CP11 CP12 CP13 CP14
S9
S1 S2 S3 S4
CP20
LS8J2M
CP21 CP22
LS8J2M LS8J2M LS8J2M LS8J2M
S10 S11
CP15 CP16 CP17 CP18
LS8J2M LS8J2M
CP23
S5 S6 S7 S8 S13
LS8J2M LS8J2M LS8J2M LS8J2M LS8J2M
• CONNECT UNIT
EP2
MPZ1608S101A
VCC-C
1
VCC
J2 COMRXD 7
AF/MIC 7
MICG AF/MIC 2
1 2
GND GND ICF3 8
3 4
COMRXD ICF3 COMTXD 6
5 6 6
3
COMTXD PTTC MICG
7 8
VCC-C VCC-C GND 4
9 10
PTTC 5
5
L3V
109
PA14
110
PA15
111
PC10
112
PC11
R11 100K
113
PC12
114
PD0
115
PD1
116
PD2
117
PON
PD3
118
T5VS
PD4
TXMS 119
PD5
120
VSS_10
121
VDD_10
RVS 122
PD6
123
PD7
124
PG9 IC1
125
PG10
126 STM32F100ZET6B
PG11
127
PG12
128
PG13
129
PG14
130
VSS_11
131
VDD_11
132
PG15
133
PB3
134
PB4
135
PB5
CF20 DIMM 136
PB6
CP1 BE 137
PB7
138
BOOT0
139
PB8
BOOT 140
PB9
141
PE0
142
PE1
143
VSS_3
144
VDD_3
C44
24P
VCC
7.93MHz
344mVP-P IC10
NRST
VOUT
4
VDD
5
NJU7704F3
UP
L3V
ENT
RIGHT IC11
C64
S12 DSCDECO 1 14
V+ CAP
2 13
0.01 IN CAP
3 12
LOCK R
4 11
J3 GND LOOP
5 10
Q REF
LS8J2M GND 6 9
1 Q NC
DOWN DIALA 7 8
2 DATA FSK
DIALB
3
POW NJM2211M
4
DSCIN
• DIAL UNIT
W1
S1 GND
1
DIALA
A 2
DIALB
J1
B 3
POW
COM 4
1
8 2
3
4
10 - 1
L3V
R3
1K
NC_BUSY
72
VDD_1
71
VSS_1
70 COM1RXD
PB11
69
COM1TXD
PB10
68
PE15 R21 R22
67 IOSTBO
PE14
66 1K
PE13 100K
65 IOSTB R23
PE12
64
PLSTB PLSTBO
PE11
63
DASTB DASTBO
PE10
62 SCKO
VDD_7
61 SDATAO
VSS_7
60
PE9
59
SCK 1K
PE8
58
SDATA
PE7
57 DB1
PG1
56 DB0
PG0
55
PF15
54
PF14
53
PTTIN R24
PF13
52 100K
VDD_6
51
VSS_6
50 S4
PF12
49 S3
PF11
48
PB2
R25
47
PTTINI
PB1
46
PB0 1K
45
PC5
44 NOISEV
PC4
43
KEYV
PA7
42
VER
PA6
41 BEEP
PA5
40 DSCOUT
PA4
39
VDD_4
38
VSS_4
37
PA3
CP25
R26
R29
VCC
27K
220K
11.99V
CP26
CLORXD
L3V L3V
R112
KEYV
MR
3
VSS 10
C71
2
12.00V
CD
1
0.068
R114
PTTINI
R66 J2
HV
10
KEYM
1
47K
PTT
2
GND
3 R115
MICG MIC-G
4
MIC 0 EP12 MIC-IN
5
GND
6
MMZ1005S601CT
SP+ SP+
C69 7
SP-
8
0.033
SP-
R57
100K
GND
CP4
L5V
CP5
VCC
SP+ SP+
SP- SP-
HV
VCC
L5V
TEMPV
MIC-G
TDETV
WDECV
DSCDEC
BEEPO
HORNO
TXMSO
RVSO
PONO
DASTBO
IOSTBO
ICF3
COMTXD
COMRXD
L3V
R75
CP6
100
IC2
CP7
1 8
IC3
2 7 1
COM
3 6 2
INH
4 5 3
VEE
4
GND
LMV358IPW
TC7W53FK
CP8
3.31V
HV
L3V
IC4
1 5
HV
CTRL VIN
Q3
2
GND DTA114EU
3 4
NC VOUT
IC5
NJM2830U1 1 8
2 7
3 6
4 5
CLOTXD
CLORXD TC7WH14FK
L5V
COM1TXD IC6
1 5
2
R91
3 4
4.7K
TC7SET04FU
L2SA1576AS
IC7
1 8
COM1RXD 2 7
3 6 Q7
4 5 2SK880
IC12 TC7WH14FK
5 1
2
RX
NM1RXD 4 3
TC7SET08FU
IC8
R101
1K R103
/NMEAI
820
PC357N6J000F
R107
L5V
12
Q8
L2SC4081
Q9
NM1TXD
DTC124EU
*: Refer to the PARTS LIST for the value and name of component.
CP3
SP-
CP2
SP+
C155
0.01
SP+
SP-
MIC-IN
LOINV
NOISEV
UNLKI
DSCENC
NC_BUSYO
T5VSO
PLSTBO
SCKO
SDATAO
RXSPMO
REXTMO
RINTMO
8
VCC
7
CH0
6
CH1
5
A
D3 R83
ICF3
L1SS400 10
CP9
R84
47K
Q4
L2SC4081
Q5
L2SC4081
R92
COMTXD
47
Q6
R95
COMRXD
1K
EP11
MMZ1005S601CT
to REAR CABLE
J4
NMEAI+
1
NMEAI-
2
NMEAO
3
GND
4