WM-FX141
SECTION 2
DIAGRAMS
2-1. BLOCK DIAGRAM 2-2. IC BLOCK DIAGRAM
— 3 — — 4 — — 5 — — 6 —
Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in Ω and
1
/
4
W or less unless otherwise
specified.
•
¢
: internal component.
• U : B+ Line.
• H : adjustment for repair.
• Power voltage is dc 3V and fed with regulated dc power
supply from external power voltage jack (J301) .
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : FM
( ) : PB
• Voltages are taken with a VOM (Input impedance 10 MΩ).
Voltage variations may be noted due to normal produc-
tion tolerances.
• Waveforms are taken with a oscilloscope.
• Signal path.
F : FM
f : AM
E : PB
FM IN
RF GND
AGC
GND2
TU-IND
ST-IND
QUAD
1
2
AM L/CUT
AM/FM MIX
3
4
5
VCC2
AM IF
FM IF
6
7
8
9
10
11
12
LPF1 M/XST
L-OUT
R-OUT
13
14
15
AM OSC
FM OSC
RF VCC
FM RF
AM IN
20
21
22
23
24
DET OUT
AFC
18
19
LPF2 AM/XFM
MPX IN
16
17
FM
IF
FM
RF
FM
IF
AM
IF
AF
FM DET
LEVEL
DET
ST/MO
FM/AM
TUNE
LED
FM
MUTE
ST
LED
AM DET
FM OSC
AM OSC
FM MIX
AM MIX
AGC
VCO
DIVIDE
DECODE
IC1 TA2111F-EL
IC301
28
L
R
M
2
1
23
8
18
17
12 6
T1
AM IF
CF1
CF2
4
25
RV301
VOLUME
HP901
PLAYBACK
HEAD
M901
REEL/CAPSTAN
MOTOR
5
24
6
18
9
2
↓
↓
1
OFF
14L OUT
13R OUT
FM/AM MIX
AM OSC
FM OSC
FM RF OUT
AM RF IN
FM RF IN
AUDIO AMP
MOTOR DRIVE
IC1
FM/AM,RF/AF AMP
J302
J301
• Signal path
DC IN 3V
Q301
PHONES
SWITCH
Q302
AM/FM SELECT
SWITCH
S305
AVLS
S302
POWER
S303(2/2)
BPF
CP1
DX → LOCAL
16
13
23 22
20
8
19
17
RV601
TAPE SPEED
+
–
S303(1/2)
(TAPE SEL)
CrO2/METAL ← NORM
S304
(FUNCTION)
FM → AM → TAPE
AM IF IN
FM IF IN
VCC2
16
LP2
10.7MHz
7
L2
FM
TRACKING
CT2
CV2
X2
QUAD
DET OUT MPX IN
L3
FM
FREQ.
COVER
CT3
CV3
20
L4
AM
FREQ.
COVER
CT4
CV4
24
L1
AM
TRACKING
CT1
CV1
22
VCC1
21
: FM
: AM
E : PB
DX/LOCAL
SWITCH
Q1
Note on Printed Wiring Board:
• X : parts extracted from the component side.
• Y : parts extracted from the conductor side.
•
®
: Through hole.
• b : Pattern from the side which enables seeing.
w
w
w
.
x
i
a
o
y
u
1
6
3
.
c
o
m
Q
Q
3
7
6
3
1
5
1
5
0
9
9
2
8
9
4
2
9
8
T
E
L
1
3
9
4
2
2
9
6
5
1
3
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
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