15
WM-FX277
Note on Schematic Diagram: MAIN SECTION
• 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.
•
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 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.
• 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
µ
sec
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
