Read Sony ICF-C253 Service Manual online
ICF-C253
— 9 —
— 10 —
4-2.
SCHEMATIC DIAGRAM
C116
0.1
TO ALARM DIAL
TUNING
TUNING
Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted. pF: µµF
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
and tantalums.
• All resistors are in
Ω
and
1
/
4
W or less unless otherwise
specified.
•
f
: internal component.
•
C
: panel designation.
•
U
: B+ Line.
•
H
: adjustment for repair.
• Voltages are dc with respect to ground under no-signal
(detuned) conditions.
no mark : FM
(
no mark : FM
(
) : AM
∗
: Impossible to measure
• Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Signal path.
F
: FM
f
: AM
The components identified by mark
0
or dotted
line with mark
0
are critical for safety.
Replace only with part number specified.
• Waveform
2Vp-p
1
IC100
wf
(XOUT)
1V/div
14
µ
sec
10
µ
sec/div
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