– 19 –
– 21 –
– 20 –
4-4. SCHEMATIC DIAGRAM
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.
•
f
: internal component.
•
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 (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
f
: AM
E
: PB
• Abbreviation
CND : Canadian
FR
: French
EA
: Saudi Arabia
CH
: Chinese
E
: Indication of country of origin
9E
: No Indication of country of origin
5E, 6E: South America
CEV
: Ukraine, Hungary, Czech
z
Waveforms
1
IC701
uf
XOUT
2
VOLT/DIV : 50 mV AC
TIME/DIV : 5
µ
sec
Q401
C
VOLT/DIV : 1 V AC
TIME/DIV : 0.1 msec
290 mVp-p
75 kHz
3.2 Vp-p
369 nsec
z
Refer to page 22 for IC Block Diagram.
WM-FX491/FX491ST/FX493/FX493ST
