Sony CFD-S28 Service Manual ▷ View online
– 27 –
– 28 –
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.
•
¢
: internal component.
•
U
: B+ Line.
•
H
: adjustment for repair.
• Power voltage is dc 9 V and fed with regulated dc power
supply from battery terminal.
• Voltages and waveform are dc with respect to ground
under no-signal (detuned) conditions.
no mark : FM
(
no mark : FM
(
) : AM
• 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.
tion tolerances.
• Circled numbers refer to waveform.
• Signal path.
• Signal path.
F
: FM
f
: AM
6-5.
SCHEMATIC DIAGRAM – TUNER Section –
•
See page 45 for IC Block Diagrams.
• Waveform
1
IC2
@º
XIN (FM mode)
500 mV/DIV, 5 µs/DIV
1.8 Vp-p
13.3
µ
s
(Page 37)
(Page 33π )
CFD-S28
– 32 –
– 33 –
– 34 –
6-7.
SCHEMATIC DIAGRAM – MAIN Section (1/3) –
•
See page 45 for IC Block Diagrams.
• Waveforms
– MAIN Board (1/3) –
– MAIN Board (1/3) –
1
Q323 Collector (REC mode)
20 V/DIV, 20 µs/DIV
20 V/DIV, 20 µs/DIV
2
Q322 Emitter, Base
Q323 Emitter, Base
Q324 Collector (REC mode)
5 V/DIV, 20 µs/DIV
Q323 Emitter, Base
Q324 Collector (REC mode)
5 V/DIV, 20 µs/DIV
3
Q324 Base, Q325 Collector (REC mode)
50 mV/DIV, 10 µs/DIV
50 mV/DIV, 10 µs/DIV
4
Q301 Base (REC mode)
500 mV/DIV, 10 µs/DIV
500 mV/DIV, 10 µs/DIV
5
Q301 Collector (REC mode)
1 V/DIV, 10 µs/DIV
1 V/DIV, 10 µs/DIV
34.4 Vp-p
20.8
µ
s
9.8 Vp-p
20.8
µ
s
128 mVp-p
20.8
µ
s
1 Vp-p
20.8
µ
s
20.8
µ
s
3.6 Vp-p
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.
•
2
: nonflammable resistor.
•
C
: panel designation.
•
U
: B+ Line.
• Power voltage is dc 9 V and fed with regulated dc power
supply from battery terminal.
• Voltages and waveforms are dc with respect to ground
under no-signal conditions.
no mark : TAPE PLAY
(
no mark : TAPE PLAY
(
) : TAPE REC
• Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Circled numbers refer to waveforms.
• Signal path.
• Signal path.
F
: TUNER (FM/AM)
E
: TAPE PLAY
a
: TAPE REC
J
: CD PLAY
Note: The components identified by mark
!
or dotted line
with mark
!
are critical for safety.
Replace only with part number specified.
(Page 28)
(Page 36)
(Page 37)
(Page 44)
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