Sony WM-FX673, Service Manual

Page: 14 / 25

WM-FX673/FX877
– 15 – – 16 – – 17 – – 18 –
6-1. BLOCK DIAGRAM – TUNER Section –
SECTION 6
DIAGRAMS
3
22
24
2
FM
IF AMP
FM
DET AF
AMP PRE
AMP
AM
IF AMP
RF
AMP
MIX
AMP
OSC
DECODER
AMP
BUFFER
Q18
MUTING
Q19
SWITCH
1/2
COUNTER
1/2
COUNTER
AM
DET
STOP
PULSE
AGC
PD1
VCO
PD2
20
21
MIX
AMP
OSC
6
FM IF
IN
DET
OUT
10
IF OUT
X1
10.7MHz
SYSTEM CONTROLLER
IC3 (1/2)
CF2
450kHz
7
QUAD
14
15
LOUT
ROUT
17 16 19 18
AM
IF IN
LPF 2A
PILOT
LPF 2B LPF1 VCO
OSC
AM
RF IN MIX
OUT
FM/AM IF AMP,FM/AM DET, MPX
IC2 (1/2)
AM MIX AMP, OSC
IC2 (2/2)
FM RF AMP, MIX AMP, OSC
IC1
CF1
10.7MHz
RV1
FM VCO
L2
FM VCO VOLTAGE
T1
AM
VCO VOLTAGE
T2
AM IF
L5
AM
TRACKING
B.P.F.
FM VCO
BUFFER
Q1, 4
STEREO/MONO
SWITCHING
Q12
LOW-PASS
FILTER
Q5, 6
IF BUFFER
Q2
• SIGNAL PATH
: FM
: AM
05
D3 (1/2)
L5
AM
FERRITE-ROD
ANTENNA
DO
66
64
AM IN
71
LOCAL/DX
SWITCHING
Q3
FM IF AMP
Q7, 14
LOCAL/DX
65
FM IN
70
D2
T1
AM OSC
L2
FM OSC
A
(Page 18)
C
(Page 18)
D
(Page 18)
B
(Page 17)
AM RF AMP
Q10
TUNER L-CH
DDC2 CTL
MUTE
R-CH
FM B+
RF B+
Q11
SWITCHING
AM
FM MPX IN
PILOT IN
Q13
IF IN
68
MONO/ST
MIX
OUT RF
IN
ANT
IF REQ
RF OUT OSC
11
4
6
8 5
1
D3 (2/2)
D1
R-CH: Same as L-CH
W V
U
+
–
PREAMP
AMS
AGC
DET
BEEP
V/I
EQ
METAL
CONTROL
SPEED
CONTROL
DIRECTION CONTROL
PHOTO REFLECTOR
SWITCH & BUFFER
Q15
PLUNGER
DRIVE
Q16, 17
AVLS CONTROL
SWITCH
Q305
MEGA BASS/
GROOVE
SWITCHING
Q302
RIPPLE FILTER
Q301
RIPPLE FILTER
+1.6V
REGULATOR
IC6
B+ SWITCH
Q804, 805
ROTATION DETECT
SENSOR
PH1
CAPSTAN/REEL
MOTOR DRIVE
IC601
SYSTEM CONTROLLER,
LIQUID CRYSTAL DISPLAY DRIVER
IC3 (2/2)
S3 – 10
M601
(CAPSTAN/REEL)
DOLBY NR
AMP
IC302
HP901
(PLAYBACK)
AUDIO MASTER AMP
(FWD/REV SELECT, PLAYBACK EQ AMP)
IC301 (1/3)
AUDIO MASTER AMP
(BASS BOOST AMP, AMS, POWER AMP)
IC301 (2/3)
AUDIO MASTER AMP
(RIPPLE FILTER)
IC301 (3/3)
•
SIGNAL PATH
: PLAYBACK
: TUNER (FM/AM)
R-CH: Same as L-CH
MOTOR
DRIVE
CIRCUIT
SWITCH &
LOGIC
CIRCUIT
BIAS
REFERENCE
VOLTAGE
OSC
CIRCUIT
REVIVE/GROOVE
SWITCHING
Q303
COMPARATOR
IC5
DC/DC
CONVERTER
T801, Q801
DC/DC
CONVERTER
IC801
POWER
CONTROL
Q802, 803
DRY BATTERY
SIZE “AA”
(IEC DESIGNATION R6)
1PC. 1.5V
(BATTERY CASE)
RECHARGEABLE
BATTERY
(NI-CD)
(NC-6WM 1.2V)
BATT B+
(1.5V)
DDC B+
(2.5V)
A/D REF B+
2 5
3
A/D REF B+
X2
75kHz
Q601
SPEED
CONTROL
SWITCH
THP601
TAPE SPEED
RV601
START
VREF
IN+
COMPARATOR
VSP
OUT
05
VCC
DATA
REMO
GND
BATT B+
BASE
PW OUT-L
PW OUT-R
PW OUT-C
POWER AMP
POWER AMP
POWER AMP
PW
NF-L
BASS BOOST
AMP
PW
IN-L
PW
IN-C
BST
OUT
VOL
RV301
HOLD
S2
2
REMOTE
J701
IN-L OUT-L
S901-2
(ATS)
PRE
OUT-L
MTL
DRV-L
FWD
IN-L
REV
IN-L
L-CH
R-CH
FWD
L-CH
R-CH
REV
R-CH
R-CH
R-CH
R-CH
R-CH
R-CH
R-CH
R-CH
S1
(DIRECTION)
OSC
OSC CTL MOTOR DIR
AMS OUT
SW
F/R SW M/N SW
61
8
7
5
DR
6
10
9
11
W
3
V
1
U
19
36
XOUT
74
XIN
75 51
18
VCC
19
RF
OUT
17
DDC B+
20
22
21
29
EQ-L
30
40
BST SW
43
AGC IN
35
BEEP
39
28
32
33
AMS
IN
12
4 5 7
8
46 44
F/R CTL (PLA
Y)
29
TAPE
52
F/R SW
44
DOLBY CTL
59
DOLBY VCC CTL
23
A
VLS CTL
54
MB/GRV CTL
57
AMS IN
37
BOOST CTL
55
REVIVE CTL
SPEED CTL
56
24
MOTOR CTL
50
BEEP
49
MT SW
41
MUTE CTL
28
PRE SW
45
PRE CTL
27
PW SW
42
AMP CTL
58
R DA
TA
OUT
31
R DA
TA
IN
34
KEY IN 43
HOLD SENS 35
HOLD SW 41
W
AKE UP
67
1
5
S901-1
(TAPE DETECT)
14
VCC
13
+
+
+
+
B+ SWITCH
Q304
FWD
STOP
REV
OFF
HOLD
PHOTO IN 39
PHOTO CTL 38
PM CTL
PM901
(PLUNGER)
60
DDC B+
DDC2 CTL
40
DDC1 CTL
62
RADIO CTL
B
(Page 16)
TUNER L-CH
A
(Page 15)
ANT
D
(Page 16)
MUTE
C
(Page 16)
DDC2 CTL
EEPROM
IC4
LIQUID CRYSTAL DISPLAY
ND1
M DA
TA
I/O
47
M CLOCK
48
2 1
CS
SK
3
DI
4
DO CS
46
COM1 – COM4
5 – 22
S1 – S18
1 – 4
30
BAND FM/AM
B+ SWITCH
Q8
Q20
D804
D803
D802
DC IN 1.5V
VT B+
PLL LOW-PASS FILTER
CIRCUIT B+
RADIO B+
FM/AM TUNER
CIRCUIT B+
RF B+
FM/AM TUNER
CIRCUIT B+
B+ SWITCH
Q9
FM B+
(FM TUNER CIRCUIT B+)
6-2. BLOCK DIAGRAM – MAIN Section –