Note For Printed Wiring Boards And Schematic Diagrams - Sony WX-7700MDX Service Manual

5-6.

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.
1
• All resistors are in Ω and / W or less unless otherwise
4
specified.
• : internal component.
f
• C : panel designation.
Note: The components identified by mark 0 or dotted line
with mark 0 are critical for safety.
Replace only with part number specified.
• A : B+ Line.
• B : 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 (detuned) conditions.
– SERVO (CD)/MAIN/DISPLAY/SUB/POWER Boards –
no mark : FM
( ) : AM
[ ] : CD PLAY
〈〈 〉〉 : MD PLAY
} : Front panel open/close motor is operating
{
∗
: Impossible to measure
– SERVO (MD) Board –
no mark : MD 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.
F : FM
f : AM
J : CD PLAY
E : MD PLAY
L : BUS AUDIO IN
a
: AUX IN
Note on Printed Wiring Boards:
• X : parts extracted from the component side.
• Y : parts extracted from the conductor side.
• z : Through hole.
• f : internal component.
• : 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
(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
key board
display board
load board
29 29
sensor (MD) board
servo board
sub board
SL SW board
sensor (CD) board
servo (CD) board
main board
WX-7700MDX
power board