Icom IC-F4261DT Service Manual page 35

• MAIN-A/B/C UNIT (1/4)
CPU5V
+5V
CDEC
DASW DASW
SDEC2
RSSI RSSI
SDEC
SSO SSO
R2 120k
TONEA
SCK SCK
R3 180k
DMO
R5C R5C
R4
MICA
T5C T5C 68k
2.50V
S5C S5C
+5V
POSW POSW
TMUT TMUT
MSCK MSCK
MDIR MDIR
R5
+5V
33k
MODD
MTCK MTCK
MTDT MTDT
MDIO MDIO
MRDF MRDF
DDAC DDAC
DDSD DDSD
MSCK
DAST DAST MDIR
PMFM PMFM
EMPH EMPH
PLST PLST
DISC DISC
VREF VREF
DMI DMI
DMO DMO
DIF DIF
DAFO DAFO
R6
MCIN MCIN
100
SENC SENC
NOIS NOIS
DDST DDST
RMUTO RMUTO
AF AF
R1
+5V
10
UNLK UNLK
DUSE DUSE
LVIN LVIN
SDEC2 SDEC2
TEMP TEMP
NWC1 NWC1
DTPD DTPD
DA2S10100L
VOXV VOXV
PWRSW PWRSW
CDEC CDEC
T2 T2
T1 T1
BATV BATV
NFM18PC104R1C3
NWC2 NWC2
TLVA TLVA
C9
ISENS ISENS
RLVA RLVA
CENC2 CENC2
CENC1 CENC1
CENC0 CENC0
SDEC SDEC
BEEP BEEP
PWON PWON
+3.3V +3.3V
VCC
56k 100k
R26
R39
0.1
C47
3 4
R51 R59
2 5
R28 22k 22k
1 6
560
Q2 DMG504010
R35 R42
4.7k 10k
R24
R34
100k
6
7
10k
5
IC5
NJM2904V
R18
C5
1k
R29
0.1
100k
R8 C21
1 SVA
10k
IC4
R52
33k
1 24
AGNDIN TEST
2 23
R53
AGND RXIN
3 22
TXIN RXINO
4 21 C37
100k
1 SVA TXINO RXLPFO
5 20 180P
LIMLV RXAF
6 19
EXTLMIN RXAFIN
7 18
MOD EXPOUT
8 17
1M
VSS VDD
9 16 R47
TCLK XIN
10 15
TDATA XOUT
11 14 X1
DI/O DIR
12 13
RDF/FC SCLK
AK2346B CR-765
R20
C51
470k
IC6
1
R11 C14 R21 Y1 VDD
2
Y0
0.1 3
3.3k Z1
3.9k
4
Z
5
Z0
6
INH
7
VEE
8
VSS
CD4053B
22k C46 R57
C16
1 2.2k
R46 0.1
C49
C24
R58
0.1
IC3
Q3
R49
2SK3019 8
0
NJM12902V
2.05V
IC1
1 5 IC7
VCC OUTPUT
4 5 4
R40
GND C25 A GND
2 3 6 3
DET INPUT CH1 VEE
7 2
1 3.3k CH0 INH
AN6123MS 8 1
VCC COM
TC7W53FK
DASW
R17
220k
IC3
13
14
C26
12
D1
0.018
NJM12902V
NFM18PC104R1C3
MMZ1005A152ET MMZ1005A152ET
EP1 EP2 C48
3.3V DC-DC
5 11
SW GND
4 12
SW ADJ
3 13
SW ITH
2 14
SW VREG
1 15
SW NC
R61
22k
IC9
1 24
VIN1 VIN8
2 23
VOUT1 VOUT8
3 22
VOUT2 VOUT7
4 21
VIN2 VIN7
5 20
VDD GND
6 19
LD RESET
7 18
CLK VDAREF
8 17
DI DO
9 16
VIN3 VIN6
10 15
VOUT3 VOUT6
11 14
VOUT4 VOUT5
AGND 12 13
VIN4 VIN5
+5V
M62364FP
82k
R73
C64
180P
6 2
7 1
R64
5 3
IC3 IC3
0
NJM12902V
NJM12902V
VREF
+5V
AGND
C78
0.1
Mute ON
C69
C57
Mute OFF 4.98V
0.1 0.001 0.1
IC8
16 1 16
Y1 VDD
15 2 15
Y Y0 Y
14 3 14
X Z1 X
13 4 13
X1 R63 Z X1
12 5 12
X0 Z0 X0
11 6 11
33k
A INH A
10 7 10
B VEE B
9 8 9
C VSS C
CD4053B
0.1
C79
1
470P
2
27k
3
4
N 0V
9 5
6
W 0V
10 7
D 4.65V
8
Analog TX 0V
RX 0V
Digital TX 4.70V
RX 5.00V
2SA1577
2SA1577 2SA1577
Q4 Q6 Q7
Q5
LDTC144EE
LDTC144EE
CPU5V
+5V
R5V
NJM12902V
IC3
4
V+
GND
11
47k
R86 LDTC144EE
C100 Q12
0.1
R87
R98
270k
47k
R103 R104 R107
R99
47k 47k
4.7k
TX 1.68V
RX 3.71V
C110
C99
0.0022
0.0015
R100 R102
68k 68k
0V
LDTA144EE
Q10
IC10
16
INPUT VDD 47k R108
15
NC NC R95
14 100k
OSC0 EST
13 IC12
NC NC
12 13
NC NC R96
11 100k 14
OSCI ACK
10 12
NC NC R97
9 100k
GND SD
NJM12902V
BU8872FS
R5V
T5V
S5V
CPU5V
+5V
2SB1132
Q11
IC11
1 5
CTRL VIN
2
GND
3 4
NB VOUT
VCC
NJM2870
Q9
R92
100
Q8
CPU5V
*: Refer to the PARTS LIST for the value and name of component.
29
HV
T5V
S5V
+5V
IC12
4
V+
GND NJM12902V
11
R113
CENC0
180k
R114
CENC1
+5V
56k
R115
CENC2
22k
47k
R109 R121 R124
SENC
68k 68k 68k
S5V
TOUT
R5V
R118
C117
MODD
0.1
100k
R122 T5V
100k
R5V
Q16
TPC6103
Q14
TPC6103
LDTC144EE
D2
Q17
DAN202U
LDTC144EE
Q15