Sony CDX-M770 - Fm/am Compact Disc Player, Service Manual

Page: 39 / 82

39 39
CDX-M770
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/MW
J : CD
for printed wiring boards:
•
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 layer’s patterns are not indicated.)
Note: The components identified by mark 0 or dotted line
with mark
0
are critical for safety.
Replace only with part number specified.
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.
• Waveforms
— Servo Board —
(MODE: CD PLAY)
1
2
3
IC1 qh (RFO)
4
22.7nsec
IC501 uj
(LRCK)
0V
5
474nsec
IC501 ul
(PCMO)
5Vp-p
Approx. 200mVp-p
IC1 qd
(TE)
5Vp-p
0V
Approx. 620mVp-p
IC1 qf
(FE)
1.2Vp-p
6
474nsec
IC501 ia
(BCK)
5.7Vp-p
7
16.89MHz
IC501 ih
(XTAI)
3.8Vp-p
8
10MHz
IC5 ea (X IN)
2Vp-p
• Waveforms
—
Main Board
—
(MODE: FM)
1
2
4.332MHz
IC202 4
(OSCD)
3.8Vp-p
1.1Vp-p
3
16.9MHz
IC901 r;
(MCKO)
4
32.768kHz
IC501 uf
(XOA)
3.68MHz
IC501 os (XO)
5.4Vp-p
2.6Vp-p
5
18.432MHz
IC702 ih (EXTAL)
3.8Vp-p
6
4MHz
IC801 4 (XOUT)
3.5Vp-p