Icom iC-m34 Service Manual page 26

SECTION 11 VOLTAGE DIAGRAM
11-1 MAIN UNIT (Left side)
DAST
SCK
SDATA
R192
390
IC200
LM2902PW R
S5V
EXPTT
270
ON :4.91V
4
OFF:0.00V
V+
R251
GND
11
Q251
EXPTT
KRA302E
Q250
PTTIN
1.90V
KRA302E
PTTIN
ON :4.86V
OFF:0.00V
R270 C382
1
10K
MC250
EM6027P
470K
R388
[PTT]
IC260
1 14
I/O1 VDD
2 13
O/I 1 CONT1
3 12
O/I 2 CONT4
4 11 DETIN
I/O2 I/O4
VOXM 5 10 DETO
CONT2 O/I 4
MICMS 6 9 MICO
CONT3 O/I 3
7 8
VSS I/O3
CD4066BPWR
DETMS
PTTM
R423
1.89V
0
R255
C383
470K
1
6
7
5
IC200
LM2902PWR
MMZ1608Y102BT
HSJ1594-010150
CLONE EP4
MMZ1608Y102BT
AFOUT
MIC
EP5
GNDE
J250
J251
BM02B-ASRS-TF
SPO
2
GND
1
[16/9] [SCAN]
[H/L]
S323 S326
S320
16/ 9 SCAN H/L
[Y] [FAV]
S321 [CH/WX] S324 S327
UP CH/WX FAV
[Z]
S322 [VOL]
[SQL] S325 S328
DOW N SQL VOL
IC190
1 24
VIN1 VIN8
2 23
FCON
VOUT1 VOUT8
PCON 3 22
VOUT2 VOUT7
4 21
VIN2 VIN7
5 20
VDD GND
DAST 6 19
LD RESET
7 18
CLK VDAREF
8 17
DI DO
9 16 SQLI
VIN3 VIN6
10 15
MCON SQLO
VOUT3 VOUT6
11 14
VOLOUT
VOUT4 VOUT5
12 13
VIN4 VIN5
M62364FP
R276
C263
0.01 180K
1.91V
LM2902PWR
9
R279
8
100K
10
1.5K
IC200
R277
R271 R272
*C265
33K 120K
*C261 R273
22K
R206
C202
18K 0.1
1.90V
R203 R207 R377 R378 R379
R212 R213
220K 27K 82K 82K 82K
1.5K 68K
C378
2 13
1 14
0.0047
3 12
IC200 IC20 0
LM2902PW R LM2902PWR
KTC2875
R346
100K
D350
EXDE T
Q350
KDS122
KRC414E
R353
1K
R351
1K R422
11- 1
AFVS
7.49V
KTA1664
Q230
AFV
WDECV
KRC404E
Q240
LEDS TXMS
DETMS
ATTS
VOXM
ATIS PTTM
EXPTT
LED ON
PTTIN
4.95V
BTYPE
BPCTRL
AFV WE T
PON
16/ 9
CH/WX
IC280 UP
1 10
DOW N
NC POUT
2 9 FAV
VCC PWGND
3 8 VOL
R286 NC PREGND
4 7 SCAN
VIN PHASE
5 6 SQL
10K RIPPLE NF
H/L
10
TA7368FG KEYM1
R284
KEYM2
KEYM3
BEEP
KEYM1
R289
KEYM2
100K
Q280
KEYM3
Q358
KRC404E
CPU5V CPU5V
VPP
IC341
IC340 1
OUT
1 8 2
A0 VCC VDD
2 7 3
A1 WP VSS
3 6
A2 SCL
4 5
S-80942CNM C
VSS SDA
ETXDO
S-24CS64A0I
0
ERXDI
S11000
DS246
4.97V
91
VSS0
92
VDD0
93
P6 0
94
P6 1
95
P6 2
96
P6 3
97
P6 4
98
P6 5
99
P6 6
10 0
P6 7
10 1
P4 0 SCOM0
10 2
P4 1 COM3
10 3
P4 2 COM2
10 4
P4 3 IC360 COM1
10 5
P4 4 UPD78F0338G C COM0
10 6
P4 5
10 7
P4 6
10 8
P4 7
10 9
P5 0 VLCDC
11 0
P5 1 CAPL
11 1
P5 2 CAPH
11 2
P5 3 AVREF1
11 3
P5 4 P120/AO0
11 4
P5 5 AVSS0
11 5
P5 6 ANI9
11 6
P5 7 ANI8
11 7
P70/TO4 P17/ANI7
11 8
P71/TI 4 P16/ANI6
11 9
P72/TO52 P15/ANI5
12 0
R345 P73/TI52 P14/ANI4
470K
CP360
CP10S TDEC
7.9872 MHz
PS
450mVP-P
DASTB
SDATAO
SCLK
X360
CR-834
5
CD
4
NC
A
B
C
60 SEG9
S9
59 SEG8
S8 R373
58 SEG7
S7
57 SEG6
S6 1M
56 SEG5
S5
55 SEG4
S4
54 SEG3
S3
53 SEG2
S2
52
SEG1
S1
51
SEG0
S0
50
49
48 COM2
47 COM1
46 COM0
45
VLC2
44
VLC1
43
VLC0
42
41
40
39
38 ATIS
37
36
35
34
33
32
31 Q352
KRC404E
LCDS
EXDET
WDECV
D
E
F
PWSW
NOISV
RSSIV
BATTV
TDETV
LOINV
VOXT
TEMPV
G
H
I
*; Refer to "PARTS LIST."