Icom IC-F4261DT Service Manual page 38

• MAIN-A/B/C UNIT (4/4)
+3.3V
+5V
BLM18RK102SN1
EP10
1.35V
IC32
L32
5 1
SW VI
2
VLCF4028T GND
4 3
FB EN
3.30V TPS62200DBVR
5.00V
CPU5V
GPS
1
2
G_TXD
3
4
5
6
7
8
9
10
1 6 OPT1
2 5
*J3
3 4
CP06S
CP129
CP06S CLI
CP130
CP06S CLO
CP131
CP06S RES
CP132
CP06S NMI
CP133
CP06S MD2
CP134
CP06S
CP135
+5V R341 1M OPT3
R342 1M OPT2
R343 47k OPT1
TX 5.00V
RX 0V
L34
2.2U
C432 0.1
R367
10k
IC33
1 8
AO1 VCC
2 7
AO2 SCL
3 6
AO3 SDA
4 5
AO4 GND
M62334FP
R351 MDIO
R368
PLST R4 FSDA NWC2
10k
R369
R5C P5 FSCL
EMPH P6
10k
1k EEMR
R352 EEMR
MMUT N7 ESDA
T5C N5 CLI
PTTO M6 FSCL
PMFM M5
1k
CLI
R353 47P CENC2
C421
CBI0 K3 MSCK DDAC
CBI3 L3 MDIR MSCK
CBI2 K2 MDIR
C423
CBI1 K1 CSFT
47P
1k
R366 10k
R354 5.00V
OPT3 M13
OPT2 P15 RES
OPT1 N14 IC34
5 1
CD OUT
2
1k
VDD
R355 4 3
NC VSS
CSO A6
CSI B6
S-80942CNMC
CCK B5
CCS A4
1k
EXTAL
15k XTAL
R360 PMFM
R370
15k
R361 DASW 12k
X6
CR-936
C420
R348 15P
PTTO
R371
100k
1M
R349
PTTI
100k
19.66MHz
TX 5.00V
3.60Vp-p
RX 0V
LDTC144EE
DZ2J051M D37
CPU5V
+5V
32
Q49
R379
100k
CPU5V
+5V
POSW R384 100k
SIDE3 R385 100k IC36
SIDE2 R386 100k 8
VCC A0
MTCK R387 100k 1k 7
WP A1
MMUT R388 100k R406 ESCL 6
SCL A2
CSI R389 100k R1 TMUT ESDA 5
SDA VSS
DASW R392 100k P2 SSO
TMUT R393 100k P1 SCK 24LC1025T
T5C R390 100k M4 S5C
R407
P4 DASW
R3 MTDT EMER
P3 DAST CCS
R2 DSDA CIRQM
CSI
1k CSO
CCK
OPT3
EMPH 15k R412
TLED
RLED
MDET
CDEC
TX 5.00V TX 0V
R398
100k MDET
RX 0V RX 5.00V
C442 47P CLO
PTTI RES
PLST R4 FSCL
MTDT R3 FSDA
DSDA R2 IEPTT
TMUT R1 PTTI
OPT2 P15 KR
CLI
C440 0.1
LVIN LRES
VOXV EPTT
C443 TEMP AF
0.1 MCIN
R401
100k
EMPH P6
R5C P5
DASW P4
DAST P3
SSO P2 DDAC
47P
C445
SCK P1 DDSD
C446 47P
R396 100k TMUT
C449 0.001
OPT1 N14 DASW
47P
C450
C441 DAST
47P
C459
0.1 RSSI PWON
C453 47P
AFVI
SDEC
R399
100k BEEP
MMUT N7
BDET PWRSW
T5C N5 AFVI
R400 PWON CBI0
1k IEPTT CBI1
UNLK CBI2
CBI3
R403
B9
B13 DDST
D12 DDAC
C14 DDSD
1k IPTT
C437
R404
0.1
D8 FSCL SIDE1
C8 FSDA
C438
D14 MDIR SIDE2
C15 MDIO
0.1
1k SIDE3
R405
A8 KR
C6 ESCL
D6 ESDA
R391 B4 CIRQ
100k 1k
*: Refer to the PARTS LIST for the value and name of component.
+3.3V
+5V
CPU5V
VCC
CPU5V
DASW
DASW
RSSI
RSSI
SSO
SSO
1 SCK
SCK
2
3 R5C
R5C
4
+5V T5C
T5C
VCC
S5C
S5C
PWON
PWON
BEEP
1 J5 BEEP
2
SDEC
3 SDEC
4
VOXV
5
VOXV
6
CENC0
7 CENC0
OPV3
8
CENC1
9 CENC1
10
CENC2
11 CENC2
12
RLVA
13 RLVA
14
ISENS
15
ISENS
16
MCIN
17 MCIN
18
TLVA
19 TLVA
20
NWC2
21 NWC2
22
BATV
23 BATV
24
T1
25
T1
26
T2
27 T2
28
CDEC
29 CDEC
30
PWRSW
PWRSW
DTPD
DTPD
NWC1
NWC1
FRONT
TEMP
TEMP
+5V
SDEC2
SDEC2
VR
LVIN
LVIN
DUSE
DUSE
R413
10
100k UNLK
9
UNLK
8
AF
7 AF
6
RMUTO
5 RMUTO
4
DDST
3 DDST
2
NOIS
1 J4
NOIS
SENC
SENC
DAFO
DAFO
DIF
DIF
DMO
R411 DMO
DMI
100k
DMI
VREF
VREF
DISC
DISC
PLST
PLST
MTCK
MTCK
MTDT
MTDT
MDIO
MDIO
MRDF
MRDF
EMPH
EMPH
PMFM
PMFM
+5V DAST
DAST
DDSD
DDSD
DDAC
DDAC
MDIR
MDIR
MSCK
MSCK
TMUT
TMUT
POSW
POSW