Sony HCD-EP707 - Note for Printed Wiring Boards and Schematic Diagrams

2020
HCD-EP707
5-5. NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS
• Waveforms
– MAIN Board –
1 IC201 ws XOUT (TUNER mode)
2 Q228 (Collector) (REC mode)
– DISPLAY Board –
qa IC101 qa X2
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.
• All resistors are in Ω and
1
/
4
W or less unless otherwise
specified.
• 2 : nonflammable resistor.
• C : panel designation.
• 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
Note:
The components identi-
fied by mark 0 or dotted
line with mark 0 are criti-
cal for safety.
Replace only with part
number specified.
Note:
Les composants identifiés par
une marque 0 sont critiques
pour la sécurité.
Ne les remplacer que par une
pièce portant le numéro
spécifié.
3.1 Vp-p
138 ns
7.9 Vp-p
10.5 µs
4.5 Vp-p
238 ns
• Circuit Boards Location
main board
display board
headphone board
VOL key board
switch board
regulator board
power AMP board
speaker jack board
3 IC203 qf XO
2.4 Vp-p
230 ns