Icom IC-F43GT Service Manual page 21

Jul. 2008
SECTION 11 VOLTAGE DIAGRAM
VCC
T5V
S5V
+5V +5V
R104 R103
REF
5
3 X2 REF
4 1 4
VCON VCC
R516 1
R108
2 3
IC25 IC24
2 GND OUT
1 5
C211
BAL 2
3 4
LVIN
EP6
+5V
IC21
24 1
OUT1 CUTO
23 2
VCCIF VCCRF
22 3
VPIF VPRF
21 4
CPOIF CPORF
20 5
GND GND
19 6
FINIF FINRF
18 7 C390
FINRF FINRF
17 8
GND GND
R345 16 9
PLST
LE OSCX
R346 15 10
SO
DATA OSCIN
SCK R347 14 11
CLOCK FO/LD
ULCK R348 13 12
I F_EN RF_EN
R359
S5V
+5V
R5V
C161
*3 MULTI
KR0
KR1
KR2
KR3
R291
KS4
S21 S22 S25 S26
P0
P1 P2 P3
S3
S23
UP S24 S7
1 2 3
R353 KS0
R354 KS1
S4 S9 S10 S11 R355 KS2
R356
KS3
4 56
DOWN
S13 S14 S15
9
7 8
S18 S19
S17
* 0 #
VSS SDA
4 5
A2 SCL
3 6
A1 WP
2 7
A0 VCC
1 8
IC10
R349
SO
SI
76
SCK
77
CLO
78
CLI 79
COM4 CIRQ 80
COM3 81
82
MUT E
83
84
S5C
85
T5C 86
R5C 87
S1 1 36 COM2 TMUT 88
P1/S1 COM2 ULCK
S2 2 35 COM1 89
P2/S2 COM1
S3 3 34 S34 90
P3/S3 S34
S4 4 33 S33 91
P4/S4 S33
S5 5 32 S32 92
P5/S5 S32
S6 6 31 S31 93
P6/S6 S31
7 30 94
S7 S30
P7/S7 S30
8 29 95
S8 S29 KRT0
P8/S8 S29
S9 9 28 S28 96
KRT1
S9 S28
S10 10 27 S27 KRT2 97
S10
S27
S11 11 26 S26 KRT3 98
S11 S26
S12 12 25 S25 KR0 99
S12 S25
100
DS3
R272
LCD
Q45
+5V
S5V
R5V
T5V
VCC
Q20
R98
Q21
R89
C156
CP1
L28
R95
L27
R90
R110
C150
C145
L32
R111
R39
C75
C166
IF IC
IC 9
FI2 1 16
OSCIN MIXIN
C61
2 15
OSCOUT GND
3 14
I O MIXOUT N-REC
4 13
C393
VCC N-DET C62
5 12
IFIN RSSI
6 11
DEC I FOUT
Q22 R44
7 10
C163 FILOUT QUAD
8 9
FILI N AFOUT
C394
R43
R45
C69 C188
R219 R218 R217 R216 R215
5 10
R520
7 8
6 9
DTMF Enc IC 6 IC6
D6 R262
CSFT
X6
C348
R259
R222
CENC0
R223
IC8 CENC1
1 5
OUT CD
R258 2
VDD R224
C352 CENC2
3 4
VSS NC
BATV
RSSI RSSI
LVIN
50
49
KEY KEY
48 KEY
47 CDEC
46 SDEC
45 BEEP
SENC
44
43
DAST
42
M RDF
41
40 MTDT
39 MTCK
IC22
38 M DIR
37 MSCK
36 MDIO
PMFM
35
OPT3
34
OPT1
33
32 OPT2
31 R352 PLST
30 R336 REF
29 R337 R323
28
R338
R325
27
26
R339
R327
R340 R329
R341
R331
R342
R333
R343 R335
R344
9
VCC
T5V
R85 RX VCO
R79
R304
C126
Q17
L42
C102
R83 TX VCO
R84 Q15 Q14
Q18
C123 R82
5 1
Q16
2
L43 L48 R88
4 3
Q19
C183
R124
+5V
R35
R5V
R31 L46
X1
C49
FI1
MIX
C58 R33 C41 C40
Q7 4 1
GND IN Q6
2 3
OUT GND
IF AMP
R22
+5V
SQLC
R514
IC13
R151
C170
1 8
2 7
3 6 R519
4 5
R154
C174
R152
C172 IC 6 IC12
TONE 2
R509
1 24
1
VIN1 VIN8
3 2 23
VOUT1 VOUT8
MO D 3 22
VOUT2 VOUT7
4 21
VIN2 VIN7
5 20
VDD GND
+5V 6 19
LD RESET
7 18
CLK VDAREF
8 17
DI DO
9 16
VIN3 VIN6
4 BA L 10 15
VOUT3 VOUT6
V+ DEVT 11 14
IC6
VOUT4 VOUT5
GND TONC 12 13
VIN4 VIN5
11
CTCSS/DTCS
IC6
13
R213
14
R209 R210 R211
12
IC19
R186
CDEC 3
R184
1
DUS E
2
Q40 R185
C225
R97
R288
R203
R204
R205
X Y Y
Cad 921 x6
FLASH WRITE
Q2
VCC
C100
Q29
D16
D5
Q3
C182
R172 Q4
AGC
R174
C186
From PA UNIT
Q5
RX
C22 C25
C29
R13 R302
RF AMP
D25
D24
+5V
R120
R510
R513
R93
R512
C35
R107 R119
C130
IC14
1 24
AGNDIN TEST
2 23
R114
R73 AGND RXI N
3 22
TXIN RXINO
4 21
C414
TXINO RXLPFO Q502
5 20
LIMLV RXAF
6 19
EXTLMI N RXAFIN R523
7 18
MOD EXPOU T
8 17 MUTE
R74 VSS VDD C128
9 16
TCLK XIN
10 15
TDATA XOU T R106
11 14 F MICOU T
DI/O DIR R118
12 13
CP4
RDF/FC SCLK
X5 G MICIN
C308
P TTIN
C360 R273
R301
PTT
C64
to DISCIN
C223
f rom AFOUT
R183 R182 R181
IC19
5
7
R240
6
BEEP
R242
C380
BEEPOUT
R289
TONE C371
R241
Vcc
AFONOP
J5
AFON
30 1
PTTIN Q42
GND C326
29 2 PTTOUT
+5V
28 3 MICOUT
VCC
27 4 MICIN
M ICMUTE
26 5 AUX
AFONOP
25 6 BUSY
BEEPOUT Q41
24 7 MDW N
RXMUTE CP46
23 8
SIGOUT
DISCIN
22 9
OPT1
AFOUT
21 10 OPT2
REM
20 11 OPT3
CCS
19 12 GND
CIRQ
18 13 OPV3
SO
17 14 OPV2
SI
16 15 OPV1
SCK
VCC
8
8
V+ IC19 Q24
V+ IC23
Q25
GND GND
4 4
+5V
S5V
R5V
T5V
VCC
NOTE: Refer to "PARTS LIST" for the value or component name.
To PA UNIT
T5V
T5V
APC
APC
GND
VCC TX
TX
J6
T5V
C79
R8
IC16
APC
5 R5
3
4
1
R9
CP53 2
CP58
Q46
S1
EMER MONI
C136
R121
C
R122 C142
CP45 6
MC1
7
5
IC23
Q38
AutoTX PTT SW
+5V
Q503
PTTOUT
J3
D
CP3
R237 R515
Q43
C336
R245
R244
C335
2
C337 R246
1
3
IC23
R315
A
R234
IC15
C324
1 10
J4
NC POUT 1
2 9
VCC PWGND 2
3 8
NC PREGND
4 7
VI N PHASE
5 6
RIPPLE NF
AFOUT
SP
CLONE
J2
R239 D28
CP70
Q44
8
6
4 C2
2
5
2 C1
1
4
1
3
S27
Q26
Q27
MP 1
Q28
J7