Block Diagrams -Tuner Section - Sony WM-GX400 Service Manual

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