Schematic Diagram - Sony WM-FX277 Service Manual

4-4. SCHEMATIC DIAGRAM

Refer to page 20 for IC Block Diagrams.
z
– 17 – – 18 –
WM-FX277/FX467/FX467ST
Waveforms
r
1
425 mVp-p
75 kHz
IC702 1
VOLT/DIV : 0.1 V AC
XOUT TIME/DIV : 5 µsec
2
1.8 Vp-p
319 nsec
VOLT/DIV : 0.5 V AC
Q401 C
TIME/DIV : 0.1 µsec
3
55 mVp-p
319 nsec
VOLT/DIV : 10mV AC
Q401 B
TIME/DIV : 0.1 µsec
Note:
• 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 / W or less unless otherwise
4
specified.
• : internal component.
f
• U : B+ Line.
• H : adjustment for repair.
• Power voltage is dc 3V and fed with regulated dc power
supply from battery terminal.
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : FM
( ) : AM (RADIO SECTION),
PLAY (TAPE SECTION)
< > : TV
• 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.
Voltage variations may be noted due to normal produc-
tion tolerances.
• Circled numbers refer to waveforms.
• Signal path.
F
: FM, TV
E : PB
– 19 –