Icom IC-F70DT, Service Manual

Page: 37 / 42

SECTION 11 VOLTAGE DIAGRAMS
11-1 FRONT UNIT
11 - 1
VOLTAGE LINE
Explanatory notes
TX LINE
RX LINE
+5V
+5V
VCC
+5V
AFO
0.001 C239
W2
I_MIC
+A5V
+5V
5
4 3
2
1
+5V
+A5V
E_MIC
2.2k R224
+A5V
+A5V +5V
E_MIC
+5V
VCC
+A5V
AFO
VCC
+5V
680p C19
VCC +5V
MCON
+5V
+5V
VCC +5V
+5V
VR BOARD
0.01 C2
LED
LED
R115 100k
FSCL
FSDA
RESB
C263 0.001 C275 100p
CP2
ERJ3GE-JPW
R261
ERJ2GE-JPW
R263-R278
R264
R265
R266
R267
R268
R269
R270
R263
R278
R277
R276
R275
R274
R273
R272
R271
KS3
KS2
KS1
KS0
FSDA
FSCL
FSDA
FSCL
TEST
SW1_B
SW2_B
SW2_A
SW3_A
GND
LED
GND
POWER_SW
5V
AFVI
XRXD
RESET
MICE
AFO
DETECT
VCC
XTXD
MIC
PTT
to LCD
unit J3
to MAIN
3 2 1
4 5
NNCD6.2G
D1
NJM12902V
IC203
TC4S66F
IC204
SPCON
VOXOUT
MIC
MCON
PTTSW
PTTI
EXPTT
KS0
KS1
KS2
KS3
KR3 KR2 KR1 KR0
KR
AFON
SP+
AFON
R8
R4
R2
R1
PWRSW
AFVI
XRXD
RES
AFO
OPTV
VCC
XTXD
E_MIC
EXPTT
EM
KR0
KR1
KR2
KR3
R106 22 R105 22
C106 22
C109 0.1
C107 0.001
C110 0.1 C105 1 C112 0.1 C111 1
V_LCD
VSS
VSS
SCL
SDA
RES
VDD2.3
VDD1
J101
GND
MIC
SP+
VCC
VCC
OPTV
AFVI
VOXOUT
PWRSW
KR
EM
PTTI
PTTSW
NC
SPCON
AFON
FSDA
FSCL
GND
RES
XTXD
XRXD
RESB
R8
R4
R2
R1
+5V
+5V
EXPTT
J1
TP
R8
R4
R2
R1
GND
LED
GND
PWRSW
+5V
AFVI
XRXD
RESET
MICE
AFO
DETECT
VCC
XTXD
MIC
EXPTT
J2
CON(4)
CON(5)
CON(6)
CON(9)
CON(7)
CON(8)
CON(3)
CON(2)
CON(1)
9
7
6
4
3
1
8
5
2
TP76N937N
R1
UW3804X
DS1
TP70TF5164S
S1
C2
C3
B3
A3
B2
A2
B1
A1 C1
NJM12902V
IC203
-
+
6
5
7
ERJ3GE-JPW R251
GND
V+
11
4
R212 3.3k
R223 27k
100k R229
0.01 C242
0.1 C241
MC201
SP1
-
+
J201
TC4S66F
IC205
1 2 3
5 4
2SB1132
Q202
XP6501 Q203
3 2 1
4 5 6
6
7
8
9
10
5
4
3
2
1
TA7368F
IC201
DTC144EU
Q207
RSR025N03
Q210
RSR025N03
Q209
2SC4116
Q208
33k R238
0.001 C244
22k R237
0.001 C235
1 C221 10 C220
100k
R221
3 2 1
4 5
0.1 C243
100k R232
NJM12902V
IC203
2
3
1
9
10
8
13
12
14
-
+
NJM12902V
IC203
-
+
NJM12902V
IC203
DTA144EE
Q206
470p C207 4.7 C204
100k R231
R228 270k
C230 68p
0.001 C234
0.001 C231 0.001 C229
ERJ3GE-JPW
R219
0.1
C216
15k
R217
330k R209 470p C203 47k R211
680k R208
1.8M R203 0.001 C201
ERJ3GE-JPW R250
MA2S111
D202
C205 0.018
15k R210
C206 0.018
R207 27k
C202 680p
0.001 C240
100k R227
0.001 C215
MA2S111
D205
UMG2N
Q201
10k R201
10k R202
10k R262
0.001 C214
MA2S111
D204
1k
R216
0.001 C213
R205 10k
1k
R204
MA2S111
D201
R241 100k
R240 470k
R239 470k
10k R242
C246 33
C245 33
0.001 C222
0.01
C247
180k
R222
C248 0.001
100k R213
MA2S111
D203
68k
R214
0.1 C211
0.001 C210
C209 0.001 C208 0.001
47p C237
10 R236
0.047 C238
10 C236
33 R235
NF
PHASE
PREGND
PWGND
POUT
RIPPLE
VIN
NC
VCC
NC
C226 10 C225 0.1
R225 2.7k
C224 0.001
3.3k R226
0.001 C212
1k R215
R116 100k C108 680p
C104 47p
[F70DT/T]only LN1371G DS112
[F70DT/T]only LN1371G DS113
[F70DS/S]only LN1371G DS110
[F70DS/S]only LN1371G DS111
[F70DT/T]only LN1371G DS108
[F70DT/T]only LN1371G DS109
0.1 C103
[F70DT/T]only LN1371G DS107
[F70DT/T]only LN1371G DS106
[F70DT/T]only LN1371G DS102
[F70DT/T]only LN1371G DS101
100k R109 100k R108 100k R107 100k R104
DAP222
D102
DAP222
D101
100k
R113
100k
R112
100k
R111
100k
R110
P3 S116 # S114 0 S108 * S106
P2 S115 9 S113 8 S107 7 S105
P1 S112 6 S110 5 S104 4 S102
P0 S111 3 S109 2 S103 S101 1
SW-167 S117
100k
R3
R33 100k R32 100k R31 100k R30 100k R40 100k R38 10k
C259 100p
R12 47
C8 100p C9 100p C10 100p C15 100p C16 0.01 C3 0.001 C13 100p C12 0.001 C11 0.001
C256 100p C255 100p
EP5
EP4
EP6
EP3
EP2
R34 1k
R35 1k
R36 1k
R37 1k
R11 1k
R259 47
R260 47
R15 47
R14 1k
R13 1k
R16 47
DTB123EK
Q104
DTC144EE
Q102
DTB123EK
Q103
C5 0.1
C7 0.001
150
R101
0.001 C264
100
R103
680p C18
680p C17
560 R102
0.1 C113
SML-A12MT DS203
SML-A12MT DS202
SML-A12MT DS201
C6 0.001
C4 0.1
C102 0.1 C101 4.7
S-812C30AMC-C2K
IC101
4
5
3
2
1
VIN
VOUT
NC
NC
GND
C271 0.1 C270 100p C261 0.001 C260 0.001
FRDG1211C DS1
G R
DTB123EK
Q2
DTB123EK
Q1
330
R2
470
R1
100k[F70DS/S] R51
100k[F70DT/T] R50
R7 100
R6 100
M62320FP
IC2
9
10
11
12
13
14
15
16
8
7
6
5
4
3
2
1
D4
D5
D6
SCL
SDA
D0
D1
D2
D3
GND
CS0
CS1
CS2
VDD SO
D7
R5 100
R4 100
C274 0.01 C272 100p C273 100p
CP1
M62320FP
IC1
9
10
11
12
13
14
15
16
8
7
6
5
4
3
2
1
D4
D5
D6
D7
VDD
CS2
CS1
CS0
GND
D3
D2
D1
D0
SDA
SCL
SO
FRONT UNIT
OFF: 4.9V
PTT ON: 1.0V
OFF: 0V
VOX ON: 3.3V
2.1V
5.0V
OFF: 0V
AF ON: 4.0V
7.2V
5.0V
TX: 0V
RX(BUSY): 5.0V
TX: 5.0V
RX(BUSY): 0V
LED ON: 7.2V
3.0V