Read Sony CDX-A251C Service Manual online
20
20
CDX-A251C
CDX-A251C
For schematic diagrams.
Note:
• All capacitors are in µF unless otherwise noted. (p: pF)
• All capacitors are in µF 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.
For printed wiring boards.
Note:
• X
: parts extracted from the component side.
• Y
: parts extracted from the conductor side.
•
a
: Through hole.
•
: Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
•
A
: B+ Line.
•
B
: B– Line.
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
• CD mechanism (1/2) and (2/2) sections
no mark : CD
• Main (1/4), (2/4), (3/4), (4/4) and Key sections
no mark : FM
no mark : CD
• Main (1/4), (2/4), (3/4), (4/4) and Key sections
no mark : FM
(
) : AM or MW
<
> : 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.
• Signal path.
J
: CD
F
: FM
f
: AM or MW
L
: AUX
• Abbreviation
CND : Canadian model
MX
MX
: Mexican model
Caution:
Pattern face side: Parts on the pattern face side seen from the
(Side B)
Pattern face side: Parts on the pattern face side seen from the
(Side B)
pattern face are indicated.
Parts face side: Parts on the parts face side seen from the
(Side A)
(Side A)
parts face are indicated.
Q
C
These are omitted.
E
B
E
These are omitted.
C
B
C
These are omitted.
B
E
• Waveforms
— SERVO BOARD (CD PLAY) —
— MAIN BOARD —
Note: The components identified by mark
0
or dotted line
with mark
0
are critical for safety.
Replace only with part number specified.
THIS NOTE IS COMMON FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is printed in each block.)
(In addition to this, the necessary note is printed in each block.)
• Abbreviation
CND : Canadian model
MX
MX
: Mexican model
1
IC2
5
(FEI)
Approx.
1Vp-p
1Vp-p
0 V
0.6 Vp-p
16.9344 MHz
Approx. 100 mVp-p
50 mV/DIV, 5 msec/DIV
0.5 V/DIV, 0.5
µ
sec/DIV
2
IC2
6
(TEI)
200 mV/DIV, 5 msec/DIV
6
IC2
oh
(FPI2),
0.5 V/DIV, 0.5
µ
sec/DIV
Approx. 400 mVp-p
3
IC2
wd
(XI)
0.2 V/DIV, 0.2
µ
sec/DIV
7
IC3
ia
(X1)
0.5 V/DIV, 0.2
µ
sec/DIV
1.1 Vp-p
12 MHz
4
IC2
ia
(RFI)
0.5 V/DIV, 0.5
µ
sec/DIV
5
IC2
of
(FNI2),
og
(FNI1)
1.5 Vp-p
oj
(FPI1)
1.5 Vp-p
0 V
1 Vp-p
32.768 kHz
1
IC501
i;
(XIN)
1.3 Vp-p
18.432 MHz
2
IC501
is
(OSCIN)
1 V/DIV, 0.1
µ
sec/DIV
1.2 Vp-p
8.664 MHz
3
IC51
9
(XTI) (AEP,UK)
0.5 V/DIV, 0.1
µ
sec/DIV
0.2 V/DIV, 0.1
µ
sec/DIV
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