38
38
DISC IN SW board
LOAD SW board
tuner unit
(TU101)
SUB board
LIMIT SW board
SERVO board
MAIN board
RELAY board
POWER board
DISPLAY board
4-5. CIRCUIT BOARDS LOCATION
For schematic diagrams
• 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.
•
¢
: internal component.
•
C
: panel designation.
THIS NOTE IS COMMON FOR PRINTED WIRING BOARDS
AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is
printed in each block.)
•
U
: 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.
•
®
: Through hole.
•
¢
: internal component.
•
b
: 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
!
or dotted line
with mark
!
are critical for safety.
Replace only with part number specified.
• Waveforms
(MODE:PLAY)
1
2
3
4
5
6
7
Approx. 620mVp-p
IC1
!§
(FE)
0V
IC1
!¶
(RFO)
1.2Vp-p
Approx. 200mVp-p
IC1
!¢
(TE)
0V
IC501
&ª
(MDP)
2.6Vp-p
7.6
µ
sec
IC501
*¶
(LRCK)
5.8Vp-p
22.7
µ
sec
IC501
(¡
(BCK)
5.7Vp-p
474nsec
16.89MHz
IC501
`⁄‚‹
(XTAI)
3.2Vp-p
Содержание CDX-C8850 - Fm/am Compact Disc Player
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