Sony CDX-L450V - Fm/am Compact Disc Player, Service Manual

Page: 22 / 62

22 22
CDX-L450V
4-6. PRINTED WIRING BOARDS — CD MECHANISM SECTION — • Refer to page 21 for Circuit Boards Location.
• Waveforms
— Servo Board —
(MODE: CD PLAY)
1
2
3
IC1
ts (PACK)
IC1 uj (RFO)
1.2Vp-p
4
Approx. 1Vp-p
IC1 oa
(FEO)
0V
5
Approx. 400mVp-p
IC1 od
(TEO)
4.4Vp-p
16.9344MHz
IC1 wd
(XTAL)
3Vp-p
0V
22.7µsec
— Main Board —
1
2
32.768kHz
IC801 ej (XT2)
3.8Vp-p
5Vp-p
8.38MHz
IC801
r; (X2)
THIS NOTE IS COMMON FOR PRINTED WIRING
BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is
printed in each block.)
for schematic diagram:
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in
Ω
and 1 /
4
W or less unless otherwise
specified.
• % : indicates tolerance.
•
f
: internal component.
• C : panel designation.
• A : B+ Line.
• Power voltage is dc 14.4V and fed with regulated dc power
supply from ACC and BATT cords.
• Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal produc-
tion tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
• Circled numbers refer to waveforms.
• Signal path.
F
: FM
f
: AM
J
: CD
for printed wiring boards:
• X : parts extracted from the component side.
•
Y
: parts extracted from the conductor side.
•
x
: parts mounted on the conductor side.
•
a
: Through hole.
• : Pattern from the side which enables seeing.
(The other layer’s patterns are not indicated.)
Caution:
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)
parts face are indicated.
Note: The components identified by mark
0
or dotted line
with mark 0 are critical for safety.
Replace only with part number specified.