Sony CFD-S28 Service Manual ▷ View online
CFD-S28
– 35 –
– 36 –
6-8.
SCHEMATIC DIAGRAM – MAIN Section (2/3) –
•
See page 39 for Waveforms.
•
See page 46 for IC Block Diagrams.
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.
•
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 : CD PLAY
no mark : CD PLAY
∗
: 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.
• 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.
J
: CD
The components identified by mark
!
or dotted
line with mark
!
are critical for safety.
Replace only with part number specified.
(Page 33)
(Page 37)
CFD-S28
– 37 –
– 38 –
6-9.
SCHEMATIC DIAGRAM – MAIN Section (3/3) –
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.
•
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 (detuned) conditions.
no mark : TUNER
(
no mark : TUNER
(
) : TAPE PLAY
<
> : CD PLAY
• 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.
(Page 33)
(Page 36)
(Page 28)
– 39 –
• Waveforms
– MAIN Board (2/3) –
– MAIN Board (2/3) –
1
IC701
$∞
TEO (CD PLAY mode)
100 mV/DIV, 1 ms/DIV
2
IC701
#£
RF O, IC703
#∞
RF
(CD PLAY mode)
200 mV/DIV, 500 ns/DIV
200 mV/DIV, 500 ns/DIV
3
IC701
1
FEO (CD PLAY mode)
50 mV/DIV, 100 ns/DIV
4
IC703
@¡
MDP (CD PLAY mode)
1 V/DIV, 5 µs/DIV
5
IC703
&º
XTAI (CD PLAY mode)
2 V/DIV, 20 ns/DIV
6
IC703
$£
BCK (CD PLAY mode)
2 V/DIV, 200 ns/DIV
7
IC703
#ª
LRCK (CD PLAY mode)
5 V/DIV, 20 µs/DIV
Approx.
100 mVp-p
100 mVp-p
1.2
±
0.1 Vp-p
Approx.
200 mVp-p
200 mVp-p
2.8 Vp-p
7.6
µ
s
4.3 Vp-p
59 ns
6.4 Vp-p
472 ns
6.6 Vp-p
22.8
µ
s
– MAIN Board (3/3) –
1
IC501
#¡
EXTAL
2 V/DIV, 100 ns/DIV
4 Vp-p
239 ns
2
IC501
&¢
TEX
1 V/DIV, 20 µs/DIV
2.9 Vp-p
30.5
µ
s
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