Icom IC-400PRO Service Manual page 32

SECTION 11 VOLTAGE DIAGRAMS
11-1 FRONT UNIT
DS11
FRONT UNIT
L2-0607TAY
C79 0.1
COM3
COM4
CPU5V
R74 10k CPU5V
R73 10k
EXOE
LCS
LSCK
LSO
R82 100k
R84 100k
R83 100k
CPU5V
DS1-DS9
SML-311YT
Q5
R7
DTC114TU
180
DS3 DS2 DS1
R8
180
DS6 DS5 DS4
LIGHT ON: 5V
R9
470
DS9 DS8 DS7
Dim ON: 6.2V
OFF: 7.2V
Q2
Q1
R12
DTC114TU
2SC4116 2.7k
TX: 0V
RX: 4.9V 7.9V
J1
8V
CLO R15 1k
AFO
PTT R76 1k
to
mic MICE
Jack
MIC L1 10µ
GND
CLI R16 1k
5.0V
5V
37 24 SEG22
COM3 S24
38 23 SEG21
S23 IC2
COM4
39 22 SEG20
S-80942CNMC-G9C
VDD S22
40 21 SEG19
5
VLCD S21
CD
41 20 SEG18
S20
VLCD1 IC6
42 19 SEG17
LC75834W 4
VLCD2 S19
NC
43 18 SEG16
VSS S18
44 17
SEG15
OSC S17
45 16 SEG14
INH S16
46 15 SEG13
CE S15
47 14 SEG12 R45
CL S14
10
48 13
SEG11
S13
DI
X1 C33
CR-520 68p
R46
1M
CPU5V
5V
LIGT2
Dim OFF: 0V
AFVI
ON : 5V
OFF: 0V
CPU5V
C2 47p
S1
POSW
R85 100k CPU5V
KS0
5V
R86 100k
S2
LIGT1 S7 KS1
CENC0
R87 100k
CENC1
KR0
REM
S3 S6
CENC2
R88 100k
KR1
S4 S5
SENC0
R89 100k
KR2
SENC1
SENC2
BEEP
SENC3
PTTI
D2 R18
MA8056 100k
5V
8V
CLO
AFO
CLI
R19
100k
AFO
R51 100k
5.0V TEMP 1
P86/AN6
1 RES BATV 2
OUT P87/AN7
CPU5V
2 3
VDD AVCC
3 4
VSS C35 0.1 X2
5
X1
6
VCL
7
RES
19.7 MHz 8
TEST IC1
2.1Vp-p
9
VSS HD64F3687
10
OSC2
11
OSC1
CPU5V 12
VCC
R48
SENC0 13
12k P50/WKP0
SENC1 14
P51/WKP1
15
P34
16
P35
R49
12k
R20 180k
R21 56k
R23
47k
R65 1k
IC5
R24 R26 R27
NJM12902V
R28
R22 22k 47k 47k 47k
12 4.7k
+ 14
13
-
R30 220k
R31 100k
R32 47k
IC5
R35 R36 R37
NJM12902V
R38
R33 22k 68k 68k 68k
3 68k
+ 1
2
-
5V
8V
R44 150k
C27 270p
C26 R41
0.1 10k
9
- 8
10
+
IC5
NJM12902V
AFO
HANG
D5
MA2S111
48 SI
P70/SCK3_2
47
P23
46 OPT2
P22/TXD
45 OPT1
P21/RXD
44 OPT3
P20/SCK3
43
P87
42
P86
41 PWON
P85
40 LCS
P67/FTI0D1
39 NMI
P66/FTI0C1
38
P65/FTI0B1
37
P64/FTI0A1
36
P60/FTI0A0 R54
35
1k
NMI
34
EXOE
P61/FTI0B0
33
P62/FTI0C0 EXST
DAST
PLST
R79
1k LSO
LSCK
IC3
HN58X2464TI
8 1
VCC A0
7 2
WP A1
6 3
SCL A2
5 4
SDA VSS
CPU5V
CTCSS : 0V
DTCS : 5V
MEASUREMENT CONDITIONS
Q3 VOLTMETER
DTC144EU
Amplitude(Oscilloscope) : 100 MHz
TENC
C23
0.0082
IC5
R39 NJM12902V
68k
5
+ 7 TONE
6
-
R90
390k
BEEP MIC
5V
8V
4 AFO
V+
IC5
GND NJM12902V
11
MIC
AFO
11 - 1
Explanatory notes
VOLTAGE LINE
TX LINE
RX LINE
J3
CPU5V CPU5V
NC
P86
OPT2 OPT2
P87
RES
OPT1 OPT1
NMI NMI
PWON PWON
RES GND
GND
GND
GND
GND
J2
GND
DIM DIM
TONE TONE
DAST DAST
TENC TENC
OPT3 OPT3
NOIS NOIS
OPT2 OPT2
EXOE EXOE
OPT1 OPT1
EXST EXST
PTT PTTO
UNLK UNLK
PTTI PTTI
PLST PLST
REM REM
CDEC CDEC
SCK SCK
SDEC R77 1.5k SDEC
to
SI SI
MAIN
OV12 OV12
unit J2
SO SO
RSSI RSSI
CIRQ CIRQ
LVIN LVIN
CCS CCS
TEMP TEMP
MIC MIC
BATV BATV
EPTT EPTT
NC
NC
NC
BEEP BEEP
5V
PWON PWON
CPU5V L2 1.0µ CPU5
8V
AFO
GND