Sony WM-FX277 - SCHEMATIC NOTES AND WAVEFORMS

15
WM-FX277
Note on Schematic Diagram: MAIN SECTION
• 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.
•
f
: internal component.
• C : panel designation.
• : 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
< > : PLAY(TAPE)
• 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.
• Signal path.
F : FM
f : AM
E : PB
• Abbreviation
MX : Mexican
CH : Chinese
E : Indication of country of origin (ST/FM MONO)
9E : No Indication of country of origin
5E, 6E : Indication of country of origin (DX/LOCAL)
TW : Taiwan
z
Waveforms
1
IC702 1
2
VOLT/DIV : 500 mV AC
TIME/DIV : 5 µsec
Q401 C
XOUT
1.5 Vp-p
13.3 µ sec
VOLT/DIV : 500 mV AC
TIME/DIV : 200 nsec
1.6 Vp-p
310 nsec