Voltage Diagram - Icom IC-A25N Service Manual

SECTION 9

VOLTAGE DIAGRAM

• LOGIC UNIT (1/2)
*R1085
C713 82P
3699
MP6
R943
100k
FWD R998 L3
10
P16
BTMICSW R993 L4
10
P24
LCDSDA 100 R901 L5
P13
BATTX 10k R999 L6
P56
L7
P52
KS3 10 R1000 L8
P83
VOLCLK 10 R996 L9
PC5
L10
KR4 10 R1001
PC4
L11
KR2 10 R1002
PC2
INI L12
10 R1003
P73
L13
PL0
BT_DEMP 10 R1004 M1
P22
SDATA 10 R973 M2
P17
M3
P86
BWD 10 R1005 M4
P12
M5
PH3
M6
BATRX 10k R1006
PH0
M7
R5F52108BDLK
P50
VOLDATA 10 M8
R997
PC6
KS1 10 R975 M9
P81
PDATA 10 R982 M10
P77
KR0 10 R1007 M11
PC0
KR1 10 R1008 M12
PC1
M13
PL1
CLIN 10 R1009 N1
P21
N2
CLOUT 10 R967
P20
H_PTT N3
10 R1010
P87
BT_SW N4
10 R987
P14
HOPC 10 R989 N5
PH2
DCC 10 R1011 N6
PH1
AFC 10 R1076 N7
P55
N8
VSS
N9
PC7
KS2 10 R976 N10
P82
N11
KR3 10 R977
PC3
N12
PCK 10 R983
P75
N13
PSTB 10 R981
P74
LIGHT
SQLUP
SQLDN
R1062
0
R1061
DICK
A
C
DIUD
B
VOL_IN
R1083
TP76D1190E20
J2 1 KR0
R1064 0
2 KR1
R1065 0
3
KR2
R1066 0
4
R1067 0
5
R1068 0 KR3
6
KR4
7
8
9
10
11
12
13
14
15
INI
KS0
L1SS400
KS1
KS2
KS3
PWRBTN
*R1086
3.3 V
C671 R911
R908
100P 22k
1M
CR-981
X1
R912
12k
G3 R1045 10 FINED
MD
G2 R1044 10 RESET
RES#
G1
XTAL
F13 LCDA0
PA2
F12 R1043 10 VORB
PA1
F11
VSS
F10
PA3
F4
PJ1
F3
R966 10
PJ3
F2
XCOUT
F1 R935 4.7k
XCIN
E13 R1042 10 LIGHT
P67
E12 R1041 10 AGCOFF
P65
E11
P66
E10
PA0
E5 R1040 10 VIN
P44
E4
IC27
NC
E3
PJ5
C684
E2
VCL
E1 0.1
VSS
D13 R1039 1k UNLK
PE6
D12 R1038 10 PWSW
PE5
D11 R970 10
PK5
D10 R1037 1k PATMP
PE7
D9 R1036 10 CHGIH
P64
D8
R1035 10 CHGDC
P60
D7
PD5
D6
P93
D5
VCC
D4 R1034 10 JACKDET
P01
D3 R1033 10 BEEP
P03
D2 R1032 10 NOISE
PF5
D1 R1031 10 PTT
P00
C13 R971 10
PK4
C12
R984 10 VORON IC37
P70
C11 VOL_IN 1
R1030 10
PE0 A0
2
A1
3
A2
4
VSS
GT24C128B
ECK
C682
0.068
4
V+
GND
*IC12
11
47k
*IC12
2
1
R1084 3
47k
LCD Backlight
ON: 4.9 V
*R74
OFF: 0 V
Q31
2SA1832
KEYLIGHT
*IC12
6
7
5
LDTC144EE
R1055
Q33
10k
Q32
2SA1832
LCD Backlight
ON: 3.3 V
LDTC144EE
OFF: 0 V
R1056
Q34
10k
LCD Backlight Brightness
Bright: 4.3 V
Dark: 5.0 V
LCD Backlight Brightness
Bright: 3.3 V
Dark: 0 V
J4
33 32
BLM15BD102SN1
EP11
C708
0.001
BLM15BD102SN1
EP10
R920 100k
R917 100k
R952 100k
R949 100k
2SA1832
IC41
1 5
CTRL VIN
2
GND
3 4
NC VOUT
NJM2831F05
8
VCC
7
WP
3.4 V
6
SCL
5
SDA
EDATA
IC38
1 5
CD VDD
2
VSS
3 4
MR VOUT
3.3 V
NJU7704F3
VOR3.3V
Displayed frequency
108.000~117.975 MHz:
12 14
118.000~136.99166 MHz: 0 V
*C111 *C112
*R85 *R86
*IC-A25N only
13
*IC12
*C113
*R60
10 3
*C107 *R79
*C108
8 1
9 2
*IC12
*IC11
*C109
*R93
*R91 *C121
9-1
D35
L1SS400
Ambient temperature 25°C: 2.5 V
R151
DCC
NTCG16
3.3 V 3.3 V
R886 D48 R883
Q24
18k 18k
L1SS400
2SA1832
Q23
IC36 IC35
1 6 1 6
1A 1Y 1A 1Y
2 5 2 5
GND VCC GND VCC
R887
3 4 3 4
2A 2Y 2A 2Y
0
SN74LVC2GU04DCKR Q25 SN74LVC2GU04DCKR
RUE002N02
Displayed frequency
1M
108.000~117.975 MHz:
118.000~136.99166 MHz: 0 V
R1081
*IC-A25N only
Displayed frequency
108.000~117.975 MHz: 3.4 V
118.000~136.99166 MHz: 0 V
*IC-A25N only
3.2 V
Explanatory notes
*Refer to the PARTS LIST for the value and name of component.
*R66 *R65 *R69
*C125
*IC11 2
*IC13
6 1
*C115
*R63 *R1091
7 3
5
6
7
5
*IC13
8 8
V+
*IC13 V+
*D17
GND GND
4 4
*Q13
*IC11
VCC
R1057
VCC
10
R5
Q3
100k L2SC4617S
R17 D7
10k DZ2J082M
HV
D47
L1SS400
Q22
2SC4738
R884
12k
5VL
3.3 V
+3V
*Q15
VOR3.3V
4 3
5 2
6 1
TX Line
RX Line
Voltage Line
*R929
*R930