Sony XA-V7W, Руководство по обслуживанию

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XAV-7W
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6-5. NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS
Note on Printed Wiring Board:
•
X : parts extracted from the component side.
• Y : parts extracted from the conductor side.
• : Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
Note on Schematic Diagram:
• All capacitors are in
µ F unless otherwise noted. pF: µµ F
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.
•
f
: internal component.
•
C
: panel designation.
•
A
: B+ Line.
• B : B– Line.
• H : adjustment for repair.
• Power voltage is dc 14.4V and fed with regulated dc power
supply from ACC and BATT cords.
– MAIN/FRONT Boards –
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions or color bar signal
input conditions.
no mark : FM (Monitor is opened)
〈〈 〉〉 : AM (MW/LW) (Monitor is opened)
( ) : Color Bar Signal Input (Monitor is opened)
[ ] : FM (Monitor is closed)
∗ : Impossible to measure
– Other Boards –
• Voltages and waveforms are dc with respect to ground
under color bar signal input conditions.
no mark : Color Bar Signal Input (Monitor is opened)
• 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/LW)
E
: AUDIO
L
: VIDEO
Caution:
Pattern face side:
Parts on the pattern face side seen from
(Conductor Side) the pattern face are indicated.
Parts face side: Parts on the parts face side seen from
(Component Side) the parts face are indicated.
• Circuit Boards Location
main board
key board
FM board
monitor board
switch board
pulse board
angle board
motor board
front board