Icom IC-M91D Service Manual Addendum page 9

August 2012
SECTION 10. VOLTAGE DIAGRAM
• RF UNIT
IC1
1 16
Fin1 Fin2
2 15
Vcc Vcc
D3
3 14
UNLK
CP1 CP2
4 13
GND GND
L1SS400
5 12
LD SW
SCKO 6 11
OSCI
CLK
SDATAO 7 10
DATA OSCO
PLSTBO 8 9
EN BO
GP214D
X1
220P
CR-921
R3 R4
C3 C19
FCON
120P
10K 47K
LOW
0.001
C133 5.6k
R47
L1 0.001 R173
2SK880
C12
Q3 6.8U 1.5K
R12
10K
LOINV
IC170
CP10S 1
OSCIN
2
CP1 OSCOUT
C462
3
MIXOUT NOISEREC
FI170 4
0.1 V+ NOISEDET
LTM450FW 5
IFIN
C463
6
I O DEC
7
0.1 FILOUT
8
FILIN
NJM2591V
C181
0.1
R176
C179
1K 270P
C180
2.25V
270P
J280
37
S251
DIST
SKRPACE010
PTTIN
R6 1
R7
2
3
1K 47K
4
L21 L22 C32
L20
2.7U 82N 1.5P
C37
82N
LDTC144EE
0.3P
Q21
Q20
KTC3770U
R22
4.7k
MOD
C34
Q22
100K
KTC3770U
R25 1.5P
D22
HVB350BYPTL
R170
390
TX:0.00V
RX:1.83V
C171
16
47P
MIXIN
15
GND
14
13
12
RSSI
11
IFOUT
10
QUAD
9
AFOUT
C159
0.01
FI151 FI150
FL-399A FL-368
R153
C156
Q151
R172
KTC3880S
0.001 1K
470
R93
10K
M5V
S3V
38
8
TX:2.83V TX:2.70V TX:4.75V
RX:2.83V RX:2.75V RX:0.00V
T5V
TX:0.79V
RX:1.32V
C40
15P
C39
Q24
2SC4215
12P
Q23
2SC4215
HVD144A
C51
Q50
D50 22P
KTC3770U
C43
22P
C42
Q25
2SC4215
5P TX:1.52V
RX:0.00V
IC50
R65
5
1 NJM2125F
4
150K
3
2
Q357
LDTC144EE
5W:1.68V
1W:1.12V
TX:0.00V
R109 R121
RX:2.69V
10 270k
TX:0.00V
RX:1.13V
0.75P
Q150
C116 C113
3SK293
R152 3P
820
4.96V
5.09V
4.89V
Q221
L2SA1576AS
3.30V
R222
IC2
47K
1 5
VIN VOUT
2
GND
3 4
CTRL NC
NJU7772F33
LDTC144EE
Q365
C54 L51 L56 L57 C72 L80
RD07MUS2B
100P Q54
15P 82N 6.8N 20N 0.001 45.3N
C65
RD01MUS2
C79
Q53
6P
Q392
LDTA144EE
C58
0.1
R67
R68 1K
100K
100 R73
R382
R83
LDTC144EE
6.8k
Q366
100K
R381
10K
TX:0.00V
RX:4.35V
TX:0.00V
RX:2.58V
C109 C101 C117 C98
0.001 47P 2.5P 2P
Q90
3SK294
R5V
T5V
KTA1664
Q225 RSQ035P03TR
Q222
L2SA1576AS Q353
R227
10K
R224
Q224
KTC811U
47K
22K
R228
LDTC144EE
Q364
Q363
LDTC144EE
*: Refer to the PARTS LIST for the value and name of component.
C74 D52 C80 L81 L82
0.001 0.001 24N 27.2N
1SV307
C84 7P
C89
11P
R547
0
TDETV
5W:0.85V
1W:0.17V
TXMS
L90
C94
5P 45.3N
R545
CP10S
0 CP300
EP6
MPZ1608S221A
R546
CP10S
CP240
0
EP7
MPZ1608S221A
MMZ1005Y102CT
R541 EP5
CP10S
Q390 10k CP301
SSM3J35FS
CP10S
CP302
4 3
5 2
OG-503040
6 1
Q391
MP24
LMUN5213DW1