Icom IC-RX7 Service Manual Addendum page 28

Feb. 2009
• MAIN UNIT (Right side)
R3V
IC1
R86
C158 L22 C173
3 4
GND OUT
2 5 1
GND GND 0.1 82 6.8N 0.1 GND
C141
1 6 2
IN VCC LO
3
0.1
UPC2746TB
1st MIXER
RF_AMP
1st_VCO_OUT
15 C174
3.5P
R97
R3V
1st VCO UNIT
J1
VP
1 2
3 4
PS
5 6
PSTB1
7 8
PDATA
9 1 0
PCK
11 12
13 14
15 16
2nd VCO UNIT
J2
1 2
3 4
+3V
5 6
7 8
9 1 0
OSC
11 12
13 14
15 16
Q43
2SA1577
MA2S728
R3V Q44
D55 2SC4738
R229 MA2S111
4.7K D54
1 st IF FI LTER
FI1
0.001
UPC2757TB UPC2757TB
EFCH429MKQP1
C203
C190 C405
RF I IFO I O RFI IF O
6 1 6
VCC 3P 10P GND VCC
5 2 5
PS LO PS
4 3 4
IC5 IC8
2nd MIX
2nd_VCO_OUT
AGC
R109
AGCC
100
Q23
UNR9115J
R129
C217
100K 150P
VCO3V
VCO1
Q25
VCO2
VCO3 XP6501
VCO4
OSC
+3V
R113
AM DET
R108 330K
C404 C191
0.033 0.033
15K
PCK
PDATA IC9
PSTB2 1 8
COM VCC
PS 2 7
INH CH0
3 6
VEE CH1
4 5
GND A
R3V TC7W53FK
VCC
OSC 19.200MHz
X1
6.8K
+3V 4 3
VCC OU T
R101 1 2
VCONT GND R110
FSET
VCO3V CR-869
270K
Ref
2nd IF FILTER
AM/NFM_CONT
FI2
DAN235E 1 4 D49
R167
C223 0 L41 L51
0.001 R149 3.3U 2.7U 0
3 2
D44 FL-293 DAN235 E
L65
3.3U
C456
27P
*R150
10K
R173
3rd IF FILTER
0.1
FI3
C261
DAN235 E
D47 ELFY450E
C247 C253
Q26
MA2S728 O I
XP6501
0.01 0.01
D45
DAN235E D48
C226
15P
L25 4.7K
120U
R169
AM
AM MODE :0.0V
BAR
FM MODE :3.1V
WFM MODE:3.1V
VP
PS
PSTB2
PSTB1
PDATA
PCK
VCO4
VCO3
VCO2
VCO1
R3V
ATTC
HFC
ANTSW
B2C
B1C
ATT
TRAC
VHFC
800MC
GC
UHFC
RX RF signals path while the earphone antenna is activated
Reference Frequency check point; CP6
CP6
C435
IF AMP
RX:0.9V
0.01
Q31
Reference frequency signal AMP
2SC5006
C269 C284 C285 C296
0.01
0.001 0.001 0.01
MA2S728
Q36
D50
2SC5006
Q37
4
R237
5
0
XP1114
MODE CONT
R189
FM DET
1.5K
IC13
1 16
OSCIN MIXIN
2 15
OSCOUT GND
3 14
M IXOUT N -RE C
4 13
VCC
N-DET
5
12 R214
IFIN R SSI
6 11
DEC IFOUT
7 10
FILOUT QUAD 680
8 9 CDBKB450KCAY24
100K FILIN AFOUT
XP1114
R184
TA31136FNG 5
X3
R190 R195 470 R215
C275 C278
4
0.01 0.01
47K 15K R204 220
Q38
C300
470P
C301
82P
L44
15U
J3
1 50
2 49
3 48
4 47
5 46
6 45
7 44
8 43
9 42
10 41
11 40
12 39
13 38
14 37
15 36
16 35
17 34
18 33
19 32
20 31
21 30 CLONE
22 29
23 28 SPO
24 27
AFE
25 26
AFO
AXK3S50335G
EP6
C183
0.01
MMZ1608D121B
11
C313 R218
OSC
0.01
1k
Q39
UNR9213J
3
2
WFM
1
Q46
UNR9213J
C434
0.22
NOISE
R SSI
1
2
Q40
3 WFM
UNR9213J
DET
HV
HVE
WFM
AGCC
DET
AM
R SSI
NOISE
+3V
VCC
FSET
SHIFT3V
TUNE
EAR
M PZ1608S221A
R227 04-730A3-02BKA
EP9
EXT DC
0
J5
EP10
M PZ1608S221A
MMZ1608Y121BT
HSJ1456-010320
EP13
EXT SP
EP14
MMZ1608Y121BT
EP12
J4
MMZ1608Y121BT
*; Refer to "PARTS LIST."