Sony Walkman WM-FX473, Service Manual

Page: 13 / 40

– 9 – – 11 – – 10 –
r
SCHEMATIC DIAGRAM (WM-FX453 : US model only)
Note:
• All capacitors are in
µ
F unless otherwise noted. pF:
µµ
F
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 (J302).
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : FM (RADIO SECTION),
PLAY (TAPE SECTION)
( ) : AM
• Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal produc-
tion tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
• Circled numbers refer to waveforms.
• Signal path.
F
: FM
E
: PB
WM-FX453/FX455
r
Waveforms
1
IC701
@¢
VOLT/DIV : 0.5 V AC
TIME/DIV : 5
µ
sec
1.9 Vp-p
75 kHz
2
Q401
C
VOLT/DIV : 0.5 V AC
TIME/DIV : 0.1
µ
sec
2.6 Vp-p
3 MHz