Note For Printed Wiring Boards And Schematic Diagrams - Sony HCD-EP707 Service Manual

HCD-EP707
5-5.

NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS

Note on Printed Wiring Boards:
• X : parts extracted from the component side.
• Y : parts extracted from the conductor side.
W : indicates side identified with part number.
•
• : Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
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.
• 2 : nonflammable resistor.
• C : panel designation.
Note:
Note:
Les composants identifiés par
The components identi-
fied by mark 0 or dotted une marque 0 sont critiques
line with mark 0 are criti-
pour la sécurité.
cal for safety. Ne les remplacer que par une
Replace only with part pièce por tant le numéro
number specified. spécifié.
• A : B+ Line.
• B : B– Line.
• H : adjustment for repair.
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : FM
( ) : AM
[ ] : CD PLAY
< > : TAPE PLAY
{ } : REC
∗ : 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
c : CD PLAY (DEGITAL OUT)
E
: TAPE PLAY
a : REC
j : AUX IN
• Abbreviation
AUS : Australian model
CND : Canadian model
• Waveforms
– MAIN Board –
1 IC201 ws XOUT (TUNER mode)
3.1 Vp-p
138 ns
2 Q228 (Collector) (REC mode)
7.9 Vp-p
10.5 µs
• Circuit Boards Location
display board
headphone board
VOL key board
20 20
– DISPLAY Board –
3 IC203 qf XO qa IC101 qa X2
2.4 Vp-p
230 ns
main board
speaker jack board
regulator board
switch board
4.5 Vp-p
238 ns
power AMP board