88
2-3. NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS
Note on 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.
•
¢
: internal component.
• C : panel designation.
Note on Printed Wiring Board:
• X : parts extracted from the component side.
• Y : parts extracted from the conductor side.
•
r
: Through hole.
•
¢
: internal component.
• b : Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
Caution:
Pattern face side: Parts on the pattern face side seen from
(Side B) the pattern face are indicated.
Parts face side: Parts on the parts face side seen from
(Side A) the parts face are indicated.
• U : B+ Line.
• Power voltage is dc 14.4V and fed with regulated dc power
supply from ACC and BATT cords.
• Voltages and waveforms are dc with respect to ground
under no-signal conditions.
no mark : CD PLAY
∗
: Impossible to measure
• Voltages are taken with a VOM (Input impedance 10 MΩ).
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.
J : CD PLAY
Note: The components identified by mark ! or dotted line
with mark ! are critical for safety.
Replace only with part number specified.
• Circuit Boards Location
KEY board
SIGNAL CONNECTOR board
POWER CONNECTOR board
MAIN board
MOTOR board
MD MAIN board
SENSOR board
Approx.
156 mVp-p
• Waveforms (MD MAIN BOARD)
1 IC501 $™ (TEO)
2 IC501 1 (FEO)
Approx.
132 mVp-p
3 IC501 #¡ (RF O)
4 IC502 @º (LRCK)
Approx.
1.1 Vp-p
5 Vp-p
22
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