Icom IC-A24 Service Manual page 33

SECTION 11 VOLTAGE DIAGRAM
DS1 A0280
C138
0.47
C139
0.47
C140
0.47
2.2M
R2
SEG11
S10 P13/ANI3
30
SEG12 61
S11 P12/ANI2
SEG13 62 29
S12 P11/ANI1
SEG14 63 28
S13 P10/ANI0
64 27
SEG15
S14 AVREF0
SEG16 65 26
S15 RESET
SEG17 66 25 R586
S16 X1
SEG18 67 24 3.3K
S17 X2
SEG19 68 23
S18 VDD1
SEG20 69 22 C2
S19 VSS1
SEG21 70 21 0.1
S20 XT1
71 20
SEG22
S21 XT2 C618
SEG23 72 19
S22 VPP 0.001
SEG24 73 18
S23 P05/INTP5/BUZ/PCL
SEG25 74 17
P90/S24 P04/INTP4
SEG26 75 16
P91/S25 P03/INTP3/ADTRG
SEG27 76 15
P92/S26 P02/INTP2
SEG28 77 14
P93/S27 P01/INTP1
78 13
SEG29
P94/S28 P00/INTP0
SEG30 79 12
P95/S29 P25/SCK1
SEG31 80 11
P96/S30 P24/SO1
81 10
SEG32
P97/S31 P23/SI1
SEG33 82 9
P80/S32 P22/SCK3
SEG34 83 8
P81/S33 P21/TXD0/SO3
SEG35 84 7
P82/S34 P20/RXD0/SI3
85 6
SEG36
P83/S35 P34/TO51/TI51
86 5
P84/S26 P33/TO50/TI50
87 4
P85/S37 P32/TI01
88 3
P86/S38 P31/TI00
89 2
P87/S39 P30/TO0
90 1
1k
R594
+5V
S1
UP
E
DN
TP70N00E2015F
R130
TP76N00
MC1 470P
C614
MA8051
INTMIC
EM-140
Q16
UNR9213J
S2 S3 S4 S5
KEY KEY KEY KEY
S6 S7 S8 S9
KEY KEY KEY KEY
S10 S11 S12 S13
KEY KEY KEY KEY
S14 S15 S16 S17
KEY KEY KEY KEY
S18 S19 S20 S21
KEY KEY KEY KEY
D1
MA2S111
• LOGIC UNIT
LVIN
DETO
VIN
1k R135
VOL_IN
1k R136
100K R137 SBATT T:5.0 XC6202P502PR
1k R138 THERM C R:5.0
CPU5V
O
1k R139 RFDETV
1k R140
1k R141 VORD
100K R133 DCIN
C143 0.1
C144 0.001
C145
0.1
0.001
C146 0.1
C620
IC2
1 5
VOUT CT
R143 0 C8 R563 2
VDD
12K 3 4
33P
MA2S077 GND NC
BD5245G
D18
X1
CR-747
DCC
SDATA
SCK
UNLK
PTT R565
100K
ECK
EDATA
D A1STB IC7
D A2STB 1 8
A0 VCC
2 7
A1 WP
3 6
A2 SCL
5
CSHIFT 4
VSS SDA
BPCPI
VORC S-24CS64A0 I
VORS
PCON
UNR9210J
Q5
CLOUT
D11
CLIN
MA2S111
CPU5V
T:4.9
R:4.9
R5
2SC4617
100K
Q3
R17 D7 D8
10K
MA8082 MA2S111
LIGHT C
4
V+
GND
11
*C111
*R85
KR0
KR1 *IC12
KR2
KR3
KR4
2
1
3
*IC12
*R74
6
*C107
*R79 *C108
7
5
*IC12
*C109
IN I
KS3
KS2
VCC: 7.2 V
KS1
Freq.: 127.050 MHz
*D 5
RSSI: 60 dBu
KS0
Measured by: Tester (Zin=more than 50 kΩ/V)
*D6
11 - 1
IC3 T:6.7
R:7.2
R595
I
0
G
IC16
1 5
GND ON/OFF
2 2SB1182
BEEP
VIN
3 4 Q4
VOUT NC
T:5.0
R:5.0 S-812C50BM C Q7
XP1501
R154
T:5.0
R:5.0
0
D10
+5V
M A2S111
R20
10K
Q6
UNR9110J
2SB1132
Q1
Q2
2SC4211
R14
UNR9213J
3.3K
Q9
Q8
UNR9213J
ALC5V
*IC12
12
*R86 *C112
14 *IC14
13
3
1
*R87 2
*C113
*R60 *R66 *R65
*IC12
*IC11 2
10 3 6
*R63 *C115
8 1 3
7
9 2 5
*IC11
*D17
*R93
*R91 *C121
*Q13
VIN
RFDETV
RSSI
VORD
SBATT
DCIN
R151
NTCG16
CLONE
HV
VORDET
*Q15
+5V
4 3
5 2
6 1
VOR CH:4. 9
*R89
8
V+
*IC14 GND
4
*C125 *R69
*C118
1
6
*IC13 7 6
5 7
5
*IC13
*IC14
8 8
V+ V+
GND GND
4 4
*IC13 *IC11
• LOGIC UNIT
J1
PDATA 1 40 R SSI
RFSTB 2 39
VORDET
+5V 3 38 VORON
PC K 4 37 RFDETV
VCC 5 36 LIGHT
6 35
INTPTT
R592 1k
PSTB R578 1k 7 34 DA1ST B
BEEP 8 33 TXC
9 32
DCIN VIN
HV 10 31 CLONE
CHGC 11 30 SCK R571 1k
CHGIH 12 29 R591 1k
SDAT A
13 28
CHGV H JACKDET
EXTREG C 14 27 SBATT
INTMIC 15 26 R590 1k
PTT
OE 16 25
D ETO R570 1k
17 24
R588 1k 18 23
19 22
20 21
R572 1k
AXK6S40545P
VORON
Explanatory notes
VOLTAGE LINE
TX LINE
*; Refer to "PARTS LIST."