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6-2. CIRCUIT BOARDS LOCATION
KARAOKE MIC board
VOL board
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
/
specified.
• C : panel designation.
Note: The components identified by mark ! or dotted line
with mark ! are critical for safety.
Replace only with part number specified.
• U : B+ Line.
• V : B– Line.
• H : adjustment for repair.
• Voltages and waveforms are dc with respect to ground
under VIDEO CD play conditions.
no mark : STANDBY
(
) : 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.
L : CD PLAY (VIDEO)
J
: CD PLAY (AUDIO)
LOADING MOTOR board
SWI board
DISP board
W or less unless otherwise
4
SENSOR board
BD board
VIDEO board
Note on Printed Wiring Boards:
• X : parts extracted from the component side.
• Y : parts extracted from the conductor side.
• b : Pattern from the side which enables seeing.
Caution:
Pattern face side:
(Side B)
Parts face side:
(Side A)
• Indication of transistor.
These are omitted.
JUNCTION board
JACK board
MAIN board
Parts on the pattern face side seen from
the pattern face are indicated.
Parts on the parts face side seen from
the parts face are indicated.
C
Q
B
E
17
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