WM-GX400
99
4-3. BLOCK DIAGRAMS – TUNER SECTION –
25
24
19
27
22
26
20
16
18
FM IN
FM/TV LPF
FM DET.
AM BPF
AGC
TV IN
REGV
MREF
FMRO
TVRO
ARFI
AMLO
FTLO
MPX
35 36
3 7
8 6 3
1
2
4
13
37
12
11
29 2 1
LEVEL
DETECT
MPRG
VCO
RV1
FM VCO
RV2
AM IF
IFCT
ATT
Q1
BUFFER
Q3
DC-DC
CONVERTER
Q401
TUNER B+
SWITCH
Q307, 308
MIC
PB
IC302
(1/2)
B
TUNER
INPUT (L)
LINE
OUT (L)
RV301
AVLS
Q405
MUTE
Q101
Q301, 302
EXCEPT CND, 5E
EXCEPT CND, 5E
CND, 5E
R-CH
R-CH
R-CH
+
-
+
-
S702-1
S702-2
S702
SPEAKER
OFF
ON
S704
AVLS
NORM
LIMIT
REC
SG
MAIN BOARD
(2/2)
A
S705
MONO
ST
LOCAL
DX
SWITCH
Q2
R22
JC2
+
-
+
-
+
-
56 57 61 16 15 14 25 2071 64
BEEP
MUTE
BAND
SD
COMP
RADIO ON
XIN
XOUT
AOUT
AM IN
FM IN
X701
75kHz
MAIN BOARD
(1/2)
SYSTEM CONTROL
IC701
(2/2)
RADIO ON
MUTE
C
IC101(L-CH)
IC201(R-CH)
IC302 (2/2)
PRE AMP
IC1
FM/AM/TV
FRONT-END,
IF, DET, FM MPX
L4
D2
L3
AM FERRITE BAR
ANTENNA
CT1
D1
L7
L6
D4
L4
FM TRACKING
L7, CT1
AM TRACKING
DISPLAY BOARD (3/3)
MAIN BOARD (2/2)
T401
L401
D402
TUNER VCC
VCC
J301
i
SP101
SPEAKER
(L-CH)
SP201
SPEAKER
(R-CH)
DFTO
MPXI
LOUT
ROUT
PLT2
COMP
TUNE
BAND
RADIO ON
LPF OUT
MUTE
R-CH
AM
OSC
FM/TV
OSC
AMP B+
SWITCH
Q371-374
VCC
VCC
MIC VCC
R–CH IS OMITTED: SAME AS L–CH
BTL
POWER AMP
VOLUME
EXCEPT
CND, 5E
CND, 5E
• Signal path.
F : FM
f : AM
a : REC
E : PB
• Abbreviation
CND : Canadian
5E : Indication of country of origin (DX, LOCAL)
w
w
w
.
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i
a
o
y
u
1
6
3
.
c
o
m
Q
Q
3
7
6
3
1
5
1
5
0
9
9
2
8
9
4
2
9
8
T
E
L
1
3
9
4
2
2
9
6
5
1
3
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
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