5-2. BLOCK DIAGRAM
– 11 –
– 12 –
WM-FX271/FX275
D2
D303
L OUT
R OUT
VCC2
QUAD
LPF1
FM/AM RF, IF, MPX
IC1
14
13
6
12
CF2
10.7MHz
X2
RADIO
+B
R CH
R-CH
L
HP901
PLAYBACK
HEAD
L.P.F
Q701,702
TAPE
SPEED
RV601
SYSTEM CONTROL/
LCD DRIVE
IC701
RADIO
+B
CF1
450kHz
L2
FM RF
T1
AM IFT
BATT+B
DC/DC
CONV.
Q307, T301
RADIO+B
SWITCH
Q53
BAND
SWITCH
Q703
NF LEVEL
SWITCH
Q101
MIX
IN(L)
H.PIN(L)
FM/AM MIX
FM IN
1
4
MOTOR SERVO
IC301(2/2)
IN+ 35
M-V REF 34
UOUT
VOUT
WOUT
FM IF
8
AUDIO POWER AMP
IC301(1/2)
REV IN(L)
FWD IN(L)
NF
SYSTEM
6
15
AM IF
7
FM RF
23
FM OSC
21
AM OSC
20
AM IN
24
LPF2
15
TUN LED
10
KEY OUT1
KEY OUT3
HOLD
17
BTT-REF1
12
X OUT
X IN
SYS CONT
HOLD
S701
FUNCTION
KEY
S701, 702, 704-708,
713, 715
VDD
ON
OFF
B.P.F
CP1
DC IN
3V
J302
DRY BATTERY
SIZE "AA"
(IEC DESIGNATION R6)
2PCS, 3V
D3
L3
FM OSC
L4
AM OSC
D1
CT1
D731
BATT+B
L1
AM
FERRITE-ROD
ANTENNA
R
FWD
+
–
9
5
POWER MUTE
21
19
REG
IC702
1
30
28
L.B-SW
32
MIX
OUT(L)
RV301-1
24
POWER
IN(L)
PWR
R-CH
COM
L CH
R CH
22
POWER
OUT(L)
16
POWER
OUT(COM) 18
J301
6
8
35
49
LCD1
LCD14
X701
75kHz
BATT+B
M901
CAPSTAN/
REEL
MOTOR
31
34
COM1
04
LCD701
LIQUID CRYSTAL
DISPLAY PANEL
COM4
KEY IN1
KEY IN4
10,11,54,56
BEEP
52
MEGA BASS
4
MUTE OUT
14
RADIO-ON
5
BAND
16
EO
19
SD
15
3
24
25
39
41
40
R-CH
DX
LOCAL
EXCEPT
US,CND,C&SA
ST
FM MONO
EXCEPT US,CND,C&SA
S303-2
VCO
BUFFER
Q2, 703
20
21
18
17
DET OUT
MPX IN
MUTE
Q306
TAPE +B
RADIO
+B
NORM
CrO
2
/
METAL
AMP
+B
BATT
+B
DOLBY B+
SWITCH
Q331
TAPE +B
TAPE +B
S303-1
NORM
LIMIT
S305-1
AVLS
26
L. P2
BTT-REF2
13
S301
TAPE
POWER
VDD
INIT
1
S303-2
US,CND,C&SA
(COM)
TAPE +B
D701
AEP,2AEP,FR,CEV,CH
EE,E,9E
JR701
JR702
10
RADIO
+B
Q308
VCO(FM/TV)
VCO(AM)
VOLUME
∑
( )
• R-CH: same as L-CH
• Signal path
: FM
: AM
: PB
T1
AM IF
L2
FM
TRACKING
L3
FM
TUNING
VOLTAGE
L4
AM
TRACKING
CT1,L1
AM
TRACKING
• Abbreviation
CND : Canadian model
C&SA : Central and South America model
AEP : Headphone (MDR-E805LP) model
2AEP : Earphone (MDR-023) model
FR : French model
CEV : Poland, Czech, Greece and Turkey model
CH : Chinese model
EE : East European model
E : Indication of country of origin
9E : No indication of country of origin
