Sony Walkman WM-FX141 Service Manual page 10

WM-FX141
Q Q
3 7 6 3 1 5 1 5 0
4-2. SCHEMATIC DIAGRAM — MAIN SECTION —
AM FERRITE-ROD ANTENNA
LOCAL
DX
S303(2/2)
CV1-4
TUNING
US,5E,6E,8E
MODEL
AEP,E,MX,EE
MODEL
T E
L 1 3 9 4 2 2 9 6 5 1 3
*
w w w
C1
US,5E,6E,8E 1PF
E,MX,AEP 1PF
EE 3PF
E,MX,EE,AEP MODEL
L3,CT3 L4,CT4
FM FREQ. COVER AM FREQ. COVER
JC2
JC3
L1
*
L1,CT1
L2,CT2 R1
AM
FM TRACKING
TRACKING *
C5
1.5 0
0.8 1.5 2.8
LPF
*
CP1
AM IF
↑
C2 C3 C4 C5 C18,C19
R1 R101,R201
18PF 22PF 6PF 33PF 0.018uF 22 0
x a o
y
18PF 22PF 6PF 33PF 0.012uF
22 10
6PF . 8PF 9PF 0.0022uF/100v i 0.012uF 18 0
— 11 —
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JC6
*
C19
*
C18
2.8 2
2.8
10.7
MHz
Q Q
3 7 6
* *
R601 R602
*
R603
→ →
*
0 R201
0
*
0
R101
↓
↓
*
R202
R102,R202 R601 R602 R603
180k 3.9 5.6 750
u 1 6 3
39k 1.5 2.2 680
180k 1.5 2.2 680
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2 4
8 9 9
L5
0
3 1 5 1 5 0 8 9
• Waveform
1
IC1 !∞
M901
(REEL/CAPSTAN)
→ →
Note:
• All capacitors are in µF unless otherwise noted. pF: µµF
J302
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in Ω and
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.
m
F : FM
f : AM
c o
E : PB
• Abbreviation
. EE : East European model
5E : Chilean model
6E : Latin America model
8E : Central and South America model
MX : Mexican model
— 12 —
2
8 9 9
2 4 9 8 2 9 9
1µsec/div
0.5V/div
1.5 Vp-p
19kHz
1 / W or less unless otherwise
4