Block Diagram -Tuner Section - Sony D-F20 Service Manual

D-F20
Q Q
3 7 6 3 1 5 1 5 0
5-3. BLOCK DIAGRAM — TUNER SECTION —
MAIN BOARD ( 2/3 )
L4
TU VCC
20
AM OSC
D3
AM
L3
OSC
AM
FERRITE-ROD
AM
ANTENNA
RF-IN
AM
22
MIX
CT3
FM
RF-IN
2
CT3,L4
FM
AM
RF-OUT
TRACKING
24
Q3
L1 CT1
D1
TU VCC
T E
L 1 3 9 4 2 2 9 6 5 1 3
TRACKING
LPF
Q84,85
VCPU+2V
BUFFER XDCDT
E (Page 15)
Q61
55 65 53
TUNER PLL,
LCD DRIVER
IC61
1 – 4 5 – 20
22 23 24 74
75kHz
LIQUID CRYSTAL
DISPLAY PANEL
LCD1
Signal path
w w w
: FM
: AM
: CD PLAY
T81
DC/DC
D80
CONVERTER
Q86
FM/AM FRONT-END,
IF DET,MPX
IC1
AM
MIX-OUT
T1
IF-IN
4 6
CF1
FM
MIX
FM
TU VCC
IF-IN
FM 7
OSC
CF3
IF
FM OSC
BUFFER
21 19 TU VCC
T1
AM IF
L2
D2
17
TU VCC
CT1,L2
IF OSC
FM
AMP
Q60
Q6
71 70 60 61 64
75 45 32 31 30 25 21
X61
1 2 3
S813 S812
(LOCAL/DX)
STEP
EEPROM
IC62
LOCAL DX 9k
+1.6V REG.
B+ +3V
IC81
x a o
y
B+ SWITCH
TU VCC
Q4,5
. i
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A MUTE
TU VCC
(Page 13) D
CD-L
CD-R R-CH
AM
DET
L-OUT
MPX-IN
AF DET-OUT FM
16 15
MUTE R-OUT
BUFFER MPX
FM
DET IF CUT
IF CUT
10 13 14
X1
Q Q
10.7MHz
3 7 6
TU VCC
TU VCC
Q2
OPEN
59 62 49 29
RESET 73
TU ON-O 54
33
XL/O-I
CD ACK-I 38
CDON-IWP-CDU 39
VCPU+2V
SDI-I-CDU 46
SDO-O-CDU 47
48
SCK-I-CDU
XHOLD-I-SW 51
52
XAVLS-I-SW
10k
HIGH/BATT
(Page 15) F 44 AD3_BATT_HIDC
AD1_KEY 42
u 1 6 3
14 14
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2 4
8 9 9
TUNER/CD
SIGNAL SELECT
IC303
8
9
RV301
VOLUME
LIN
12 11
10 14
11 R-CH
MUTE
19
PWRSW
20
12 6
BEEP
17
VDD+2V
3 1 5 1 5 0 8 9 2
D601
6 7 2 28
29 XCDRESET_TU-O
WP_OPEN
74
CDWP_I
37 L/O_I
ACK_CD_I
34
CDON_O
5
SYSTEM CONTROL
IC801 (2/3)
32 (CD)SDO_O
31 (CD)SDI_I
30
TUSCK_I
39 HOLD_I
38 AVLS_I
ESP
18 AD_CDKEY m
c o
KEY MATRIX
S805 - 811
.
2
8 9 9
HEADPHONE AMP
IC302
R-CH
J302
LOUT
8 i
MT SW
R-CH
PW SW
BEEP
12
4 9 8 2 9 9
OPEN
S801
(CD DOOR OPEN)
21
S802
AVLS
AVLS
NORM
LIMIT
S803
HOLD
HOLD
OFF
ON
S804
ESP
36
OFF
ON
VCPU+2V