Main Unit - Icom PMR446 Service Manual

SECTION 11 VOLTAGE DIAGRAM

11-1 MAIN UNIT

C : COMMON
T : TX
R117 R59
R : RX
100 k 100 k
SO : SQL OPEN
SC : SQL CLOSE
LON : LIGHT ON
LOF : LIGHT OFF
W2 S1
SW-149
R89
1 k
C74
0.001
R90
1 k
C75
0.001
R96
100 k
C92 R97
470 P 100 k
C53
0.1
IC3
AT24C02N
C87
470 P
R68 R69
18 k 18 k
1 VCC 8
NC
2 NC 7
NC
3 SCL 6
NC
4 SDA 5
VSS
BATIN 61
AN3
C54
SENIN 62
0.1 AN4
63
AN5
64
AVSS
65
AVREF
66
C45 R63 VDD
67
24 P 5.6 k
XT1
68
XT2
69
X1 R72 IC
CR-627 1 M 70
X1
71
X2
RESET 72
C46 RESET
EEPCK 73
24 P
P60/KR0
EEPDA 74
P61/KR1
PSC 75
P62/KR2
RXV 76
P63/KR3
TXV 77
P70/KR4
LAMPC 78
P71/KR5
MICSW 79
LON: 0 P72/KR6
MMUTE 80
LOF: 3.02
P73/KR7
Q14
DTA114EU
DS1
LN1371G
LON: 0.76
R61
LOF: 0 47
R204
6.8 k
R98 R99 R100 R101 R102
100 k 100 k 100 k 100 k 100 k
PTT DOWN UP MODE POWER
R67 18 k
R71 33 k
R70 68 k
TEST
R103
100 k
R62
100 k
40
P02/SO/SB0
P01/SCK 39
P00/INT4 38
P53 37
36
P52
R105
P51 35
10 k
P50 34
VSS 33
IC1 P43 32
µPD753036GK-559-BE9
P42 31 PTT2
P41 30
P40 29 R64
18 k
VLC2 28
VLC1 27
VLC0 26
R65
25 18 k
BIAS
COM3 24
COM2 23
22
COM1
21 R66
COM0
18 k
R74 10 k
DS2
LD-BU10503J T: 3.05
R: 2.37
R76
100 k
1
+3 V 2
C60
3
0.1
C80
C: 3.11
100
J4
SHIFT PSC
1 2
CK BATT
3 4
DATA
5 6
T+3
STB
7 8
VOL
SQL
9 10
SENS R+3
11 12
AF
13 14
to RF unit J2
MOD
T: 1.50
R: 0
IC2a
NJM2100M
T: 1.53
C29
R: 0
150 P
T: 1.51
R39
R: 0
R30 82 k
3
8
R2 R203
15 k
82 k 8.2 k
2
1
C73
4 C1
0.0033
0.0027 R40 R108
100 k 33 k
C99
0.0033
T-ID
R45
R46 C36
2.2 M
0.001
100
C: 3.10
R36
R37
C: 1.95
10 k
22 k Q7
C40
2SC4081 S
0.1 R38
C34
22 k
0.0047
C31
C32
0.022 0.1
R41
R35
5.6 k
5.6 k
R106 C: 1.44
10 k
T: 0
C82
R57
R: 0.88
0.047 C51
15 k
0.1
C26
R32
C27
470 P R33
680 k
0.1
6.8 k
Q12
2SC4081 S R34
C28
6.8 k
0.047
RMUTE
AFON
REMIN
BEEP
R79 220 k
BATIN
C61 R94 C56
0.1
0.1 220 k
R80
Q18
100 k
2SA1586 GR
T: 0
R: 2.95
C67
2.2
R81
10 k
TXV
RXV
R+3
C: 3.02
IC5 C: 3.81
S-80928ANMP
5
OUT
NC C65
3 2 1
VDD 0.1
4
NC
Q25
VSS
C63 C94
IC6 S-81230SG
UMZ2N
0.1 330 P
C81 1
R78 5
GND
0.033 NC
4 5 6 10 k 2
VIN
+3 V 4
3
NC
VOUT
C: 2.46
W7
C64
R77
C88 C62
22
470
470 P 0.1
D4
1SS355
C: 3.02
C89
470 P
C: 3.12
T: 0
Q1
R: 3.02
DTA144EU
R202
100
C: 3.10 C: 0
PTT2
Q2 Q3
T: 3.05 UN9214 DTA123JUA
R: 0
C7 C91
0.1 470 P
C6
Q6
T: 1.58 R6
1
IC2b 180 k
R: 0 2SK1829
NJM2100M
R4
5
82 k C3
7
R7 0.1
6
C83 1.2 k
0.1
R9
R50
100 k 4.7 k
R51 R52
C93 R118
C85
470 k 330 k
0.1 330 P 4.7 k
R5
C24
1.2 M
0.033
T: 1.60
R31 C25
R53
R: 0
1 M 470 P
1.5 M
MMUTE
R110
C35
1 M
0.1
R43
56 k
R42
3.3 k
Q23
C21
2SJ144 Y
0.1
R86
C72
100 k
0.01
R87
1 M
T: 0
SC: 0
SO: 4.63
R24 1.5 M
Q5
T: 3.91 T,SC: 0
2SA1362 GR C49 C48 SO: 1.99
SO: 3.87
R25
SC: 3.93 0.1 22
12 k 1
8
R23 2 7 C17
Q10
150
15 k
3 6
T: 0 2SC4081 S
SO: 2.93 T,SC: 0
4 5
SC: 0 SO: 0.69
R55 R56
1
120
C55 IC9
C47
R54
3.3 470 P
NJM2070M
1.2 k
C50
C52
0.1
2.2
T: 0
Q11
SO: 2.30
2SC4213 B
SC: 0
R+3
BATT
R200 T: 0.80 T: 0.18
T: 3.02
C57 R201
2.2 M C: 3.64 R: 0 R: 0
0.1 R: 0
270
3 2 1
Q101
Q27
UMZ1N
2SC4081 S
R112
C86
10 k 4 5 6
0.1
T: 3.67
D5
R: 4.41
1SS355
R115
T: 2.64 R114
560
R: 0 3.3 k
T: 3.64
R: 0
11 - 1
C44
0.1
C90
470 P
R49
100
C8
10
C9 C42
470 P 0.01
C: 3.12
J1
R13
4.7 k W3
C95
R10
330 P
82
C4
0.1
MC1 KUC3523
C79
R14 C10
0.1
3.3 k 470 P
T: 0
R: 3.12
C5
470 P
C11
470 P
T: 2.79
R: 0
Q29
DTC114EU
T: 3.02
R: 0
T: 2.79
SO: 0
SC: 2.79
C15
0.1
R22 33 k
R58
R88
RV-244
100 k
10 k
C59
470 P R27
VOLUME
100
C20 D2
0.1 1SS355
J3
REMIN
C18
10
SP1
CHASSIS
R26
10 k C97 C96
330 P 330 P
W5
R119
100 k
C98
Q28
330 P
2SB798 DK
C71
0.1