Voltage Diagram; Logic Unit - Icom IC-M502 Service Manual

SECTION 11

VOLTAGE DIAGRAM

11-1 LOGIC UNIT

SEG18 103
SEG18
SEG19 104
SEG19
SEG20 105
SEG20
SEG21 106
SEG21
SEG22 107
SEG22
SEG23 108
SEG23
SEG24 109
SEG24
110
SEG25
SEG25
111
SEG26
SEG26
SEG27 112
SEG27
SEG28 113
SEG28
SEG29 114
SEG29
SEG30 115
SEG30 IC2
SEG31 116
SEG30 HD66712SA03FS
SEG32 117
SEG32
SEG33 118
SEG33
119
SEG34
SEG34
120
SEG35
SEG35
121
SEG36
SEG36
SEG37 122
SEG37
SEG38 123
SEG38
SEG39 124
SEG39
SEG40 125
SEG40
SEG41 126
SEG41
SEG42 127
SEG42
SEG43 128
SEG43
J1
KEYM
1
to HM-126
2 C25
R52
J2
0.01
10k
DS16 DS11 DS9 DS7
DS15 DS12 DS10 DS8
DS1
TSD0393
DS14 DS13
DS6
R53 R43 R42
220 220 220
S1
SPPH22014A
+5V
R44
10k
R45 R46 R47 R48
10k 27k 10k 10k
-1.89V 1.94V
C21 C19 C20
1 0.01 0.1
V5 64
V5OUT3 63
V5OUT2 62 21
C22
GND 61 22
1
C1 60 23
C2 59 24
VCI 58 25
DB7 57 26
DB7
DB6 56 27
DB6
DB5 55 DB5 E 28
DB4 54 DB4 RW 29
DB3 53 DB3 RS 30
DB2 52 DB2 DB7 31
DB1 51 DB1 DB6 32
DB0/SOD 50 DB0 DB5 33
E/SCLK 49 E DB4 34
RW/SID 48 35
RW DB3
RS/CS 47 36
RS DB2
GND 46 37
DB1
TEST 45 DB0 38
EXT 44 39
+5V
IM 43 40
RESET 42
M 41
D 40
CL2 39
C17 C18
R49
C23
10 0.01
100k
0.01
5.06V
R50
C24
390k
0.1
R51
120k
289kHz
R33 R34 R35
4.9Vp-p
100k 100k 100k
DISTRESS
DS3–DS17
SML-311YT
DSC SCAN CH/WX 16
DS17 DS5
DS3 DS4
POWER SW
R41
H/L IC
220
R30 R29 R28 R27
10k 10k 10k 10k
P40/KR0 80
S10
P41/KR1 79
S11
P42/KR2 78
S12
P43/KR3 77
S13
P44/KR4 76
S14
P45/KR5 75
S15
IC 74
P93/S16
XT1 73
P92/S17
XT2 72
C16 0.01
P91/S18 IC1
VDD0 71
µPD789405AGK-A30-9EU
P90/S19
VSS0 70
P87/S20
X1 69
P86/S21
X2 68
P85/S22 R65 1M
67
P84/S23 RESET
P46 66
P83/S24
P47 65
P82/S25
P00 64
P81/S26
P01 63
P80/S27
P02 62
AVDD
P03 61
AVREF
CONTSEG1
CONTSEG2
CONTSEG3
R66
100k
R36 R37
100k 100k
Q5
R32 DTA144EU R31
10k
10k
Q6
DTC144EU
DTRS
DS2
SML-311YT
DSC
SCAN
J3
CHWX W1
+5V SQL5V
1
1
CH16 SQLV SQLV
2
2
SQLG SQLG
3 3
DIALA DIALA
4 4
GND GND
5 5
R38 DIALB DIALB
6 6
220
D1
MA8043
IC
HL
HV
HVS
+5V
Q1
2SK1069
R1
R2
47k R7
10k
1.5k
R3 R64
R4
47k 33k
10k
R8
10k
C9
R5
R6 R10
0.1
47k
10k
12k
C15
R9
0.01
DIM4 NTCCM16084BH
R67
R68
18k
10k
Q3
R11
2SB1132
R12
20k
CONTDOT1 10k R69
CONTDOT2 39k
CONTDOT3
R13
DIM1
R14
18k
DIM2
10k
Q2
DIM3
2SC4116
+5V Q8
R15
2SC4116
20k
R16 R70
10k 47k R17
1k
X1
CSTCC4.91MG
DIM4
HL
R22 10k
DSC
IC
3.73V
C4
Q4
DTRS
0.1
2SK1069
R18
R23
100k
1.5k
4.93MHz
5.1Vp-p
R19
R24
47k
10k
R20
22k
C14
R26
0.1
R25 10k
NTCCM16084BH
SQLV
DIALA
DIALB
+5V
VPP
SRESET
LMDA
HVS
HV
11 - 1
SQL UNIT
J1 R1
SQLG
1
SQLV
2
SQL5V
3
DIAL UNIT
J2
S1
DIALB
1
GND
2
3
DIALA
4
LOGIC UNIT
7.95V
C11 C12
10 0.001
8.02V
8V
R55
10k
C13
0.01
R56
3.3k
C3
0.1
C5 C6
to Internal
0.001 0.001 Speaker
SP+
SP–
C1 C2
0.001 0.001
J4
SP–
1
SP+
2
SP–
3
SP+
4
GND
5
+5V
6
GND
to MAIN
7
SRESET unit J4
8
8V
9
VPP
10
MLDA
11
LMDA
12
HVS
13
HV
14
C7 C8
0.01 0.01