Icom IC-M412 Service Manual page 45

Oct. 2010
SECTION 10 VOLTAGE DIAGRAM
MAIN-A UNIT (Left side)
IC10
KIA7805API-U/PF
5V VCC
O I
COM
IC9
C351 R353 C353 EP403
LA4425A
0.1 470K 1 MMZ1608Y301C 5
1
4
2
3
R354
R357
15K
1
R358
1
11.7V
Q65
3.05V
KTC4075
R571 R573 R574 R575 R577
C581
18K 10K 10K 10K 10K
0.01
C571 C574
0.1 0.022
R294
10
AF5V
R252
1M
IC4
CD4053B
1 16
Y1 VDD
2 15
Y0 Y
3 14
Z1 X
4 13
Z X1
5 12
Z0 X0
6 10
INH A
11
7
VEE B
8 9
VSS
VBIAS
AF5V
R315
68K
C313
0.0039
R323
47K
CP18
HV
To DC POWER
CP19
VCC
C356 EP341
SP+
470 MPZ1608S221A CP16
SP+
to EXT SP
EP342 SP-
MPZ1608S221A CP17
R583
47
C586
0.033
IC15
NJM2211M
1 14
V+ CAP
2 13
IN CAP
3 12
LOCK
4 11
LOOP
GND
5 10
REF
6 9
NC
7 DATA 8
FSK
R584
100K
R250
2.8V 1M
RX:4.6V
R238 R239
33K 33K
C233 C234 C236
Q31
0.022 0.022 0.0022
KTC4075
C238
R232
15K 1
R307 EP402
68K MMZ1608Y301C
R312
22K
R309 R308
RMUTE
47K 47K
C306 SEND
120P RCV
MICM
IC8
H/L
NJM4558M
TXDET
1 8
TMUTE
2 7
3 6
RVSIF
4 5
MPS
SPS
PSTB
PCK
HV
Q1
KTC4075
R21
1K
5V
R23
47K
R26 R28
1 33K 33K
2
3
4
R651
5
ERJ3GE-JPW
6
R652
7
47
8
MOD
VCC
R401
J4
100
1
2
3
5V
EP401 4
5
MMZ1608Y301C
UNLK
SPS
4.97V
IC5
TC7S66FU
R433
1 5 MPS
10K
2
3 4 PSTB
PDATA
PCK
5V
VCC
SP+
J6
1 2
SP-
3 4
BEEP
5 6
BPCON
7 8
9 10
11 12
13 14
15 16
17 18
DSCDEC
19 20
SQLV
21 22
DSCENC
23 24
BPFV
25 26
SQL
27 28
KEYM
29 30
PTT
31 32
33 34
35 36
PDATA
37 38
UNLK
39 40
5V
VCO5V
L4
L3
0.25-1.9-8TL
NLV32T
2.3V
D2 C45
MA2S077G0 1.5P
C51
R24
0.75P
1K
Q4
2SC4226
Q2
D1
KRC404
MA2S077G0
C46
Q5 0.8V
1.5P
2SC4226
R25
470
IC16
S-812C36AMC-C2Q-G
1 5
GND NC
2
VIN
3 4
VOUT NC
R6
1K
Q86
3.6V
KRC404
R431
10K
IC1
MB15F72ULPFT
DORF LD/FOUT
11 10
VPRF DOIF
12 9
PSRF VPIF
13 8
VCCRF PSIF
14 7
GNDRF VCCIF
R1
15 6
XFINRF GNDIF
10K 16 5
FINRF XFINIF
R3
17 4
LE FINIF
10K 18 3
DATA GND
R2 19 2
CLOCK OSCIN
10K 20 1
R602
680
CP2
5V
VCC
C626 L75
0.001 MLG1608B
RX:4.65V
Q71
KTC4075
D53
MA2S077G0
Q70
KRC404
RX:4.1V
RX:4.0V
RX: 5.0V <159.97 5MHz
0V >160 MHz
L70 D52
NLV32T HVC358B-E
C616
Q74
0.75P
2SC4215
9
HV
3.9V
2.35V
C58
33P
LO
C56
12P
Q7
2SC4215
3.14V
C33
22P
Q6
2SC4215
C32
Q3
5P
2SC4215
R34
18
C37 L2
MLG1608B
0.001
R14 L5
3.9K NLV25T
4.98V
R13
47
X1
CR-804A
Q85
KTC4080
4.1V
R624
150
RX:5.6V
RX:6.0V
C623
C634
22P
C621 15P
5P
Q75
2SC4215
Q76
2SC4215
C633
12P
R635
680
*; Refer to "PARTS LIST."