Block Diagram - Sony WM-FX477 Service Manual

Pin No. Pin Name I/O Pin Description
76 VXT — Stabilized capacitor connection of crystal oscillation power supply.
77 VLCD — LCD driver power rising pressure pin
78, 79 C1, 2 — LCD driver power rising pressure pin
80 VEE — 1.5 V constant voltage power supply for LCD driver.
– 13 –

5-2. BLOCK DIAGRAM

FM/AM RF, IF, MPX
HP901
IC1
PB HEAD
FL1
L
B.P.F 2 FM RF IN L OUT 12
4 MIX OUT
FWD
CF2
R
10.7MHz
US,CND,C&SA 7 FM IF IN R OUT 11 R CH
MODEL
T1
SWITCH L
AM IFT
CF1
Q2
REV
450kHz
6 AM IF IN
R
T1
AM IF
24 FM RF
D1
D401
DC/DC
TUNER
CONV.
VCC
Q401,T401
L1
FM RF
L1
FM
21 FM OSC
D2
TRACKING
L3
FM
TUNER
L3
TUNING
VCC
FM OSC
VOLTAGE
RIPPLE
L4 VCC 5 FILTER
D3
Q51,52
AM
TUNING
20 AM OSC QUAD 10 X1
VOLTAGE
L4
AM OSC
CT1,L2
AM RADIO+B
CT1
22 AM RF
TRACKING SWITCH
Q53
L2
AM
US,CND,C&SA
FERRITE-ROD
MODEL
ANTENNA
OSC OUT 19
14 LPF1 DOLBY B+
SWITCH
13 LPF2 +B
17 IF REQ
L.P.F
Q701,702
VCO
BUFFER
Q703
31 59 65 61 64 70 71 60
04
1 4 5 22 75 74 26
Q607
X701
ND701 75kHz
LIQUID CRYSTAL BRAKE
DISPLAY PANEL SWITCH
Q604-606
• RCH: same as L-CH M901
CAPSTAN/
• Signal path
REEL
MOTOR
: FM
: AM
BATT+B
: PB
• Abbreviation
CND : Canadian model
C&SA : Central and South America model
– 14 –
AUDIO
POWER AMP
IC301(1/2)
FWD IN(L)
9
REV IN(L) +
10 5
–
FX479
R CH NF
6
FX477
DOLBY NR
IC331
4 5
R CH
ON/OFF
SYSTEM 13
15 SYS CONT
REF
21
MUTE
Q306
NF LEVEL
SWITCH
BATT+B Q101
FWD/REV
SWITCH
Q301
R-CH
DOLBY
+B
Q331
29 32 62 28 47
SYSTEM CONTROL/
LCD DRIVE
IC701
24 25 23 33
MOTOR SERVO
IC301(2/2)
AMP
Q751
39 UOUT S/S 3
MOTOR
SPEED SW
40 VOUT IN+ 35
Q603
RV601
M-V REF 34
41 WOUT TAPE
SPEED
MOTOR
DR 43 DIRECTION
Q602
WM-FX477/FX479
RV301
MIX
VOL
IN(L) R CH
MIX POWER POWER J301
30
OUT(L) IN(L) OUT(L)
L CH
24 22 16
H.PIN(L) COM
28 PWR
POWER
OUT(COM)
18
32 L.B-SW
R-CH
AVLS
CONTROL
Q303
(1/2)
S702-715
FUNCTION
KEY
B+
OFF
S701
HOLD
ON
S301
(OPEN DET)
30 49 38 41 34 37 43 48
FWD
FWD 58
FF 57
FF
S601
(MD CONT)
REW
REW 56
REV
55 RVS
27 46 45 73 72 42 38
L701
B+
BATT+B
PHOTO
DRY BATTERY
REFLECTOR
POWER
SIZE "AA"
Q752
SWITCH
(IEC DESIGNATION R6)
Q753
D731
2PCS, 3V
REG
3 1
IC702
PH751
POWER
+B AMP SW
DC IN
Q304
AMP
CONT
Q305
– 15 –
J302
3V