Read Sony ICF-C492 Service Manual online
ICF-C492
9
9
ICF-C492
SECTION 5
DIAGRAMS
•
Note for Printed Wiring Boards and Schematic Diagrams
Note on Printed Wiring Boards:
• X
: parts extracted from the component side.
• Y
: parts extracted from the conductor side.
• W
: indicates side identified with part number.
•
f
: internal component.
•
: Pattern from the side which enables seeing.
Note on Schematic Diagram:
•
All capacitors are in
µ
F unless otherwise noted. (p: pF)
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.
• A
: B+ Line.
• H
: adjustment for repair.
•
Power voltage is dc 9 V and fed with regulated dc power
supply from battery terminal or AC input.
supply from battery terminal or AC input.
•
Voltages and waveform are dc with respect to ground un-
der no-signal (detuned) conditions.
no mark : clock
(
der no-signal (detuned) conditions.
no mark : clock
(
) : FM
[
] : AM
〈〈
〉〉
: DC 9V input (AC off)
•
Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
•
Waveform is taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
Voltage variations may be noted due to normal produc-
tion tolerances.
•
Circled number refer to waveform.
•
Signal path.
F
: FM
f
: AM
•
Abbreviation
KR
KR
: Korean model
SP
: Singapore model
The components identified by mark 0 or dotted
line with mark 0 are critical for safety.
Replace only with part number specified.
line with mark 0 are critical for safety.
Replace only with part number specified.
•
Waveform
– MAIN Board –
1
IC101
qh
(CR OSC)
(DC 9V input (AC off))
2 V/DIV, 200
µ
s/DIV
420
µ
s
3.5 Vp-p
Ver. 1.2
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