CMT-EP707, HCD-EP707 - Sony Audio Service Manual (repair manual). Page 20

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20
20
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 
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.
•
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 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
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 por tant le numéro
spécifié.
3.1 Vp-p
138 ns
7.9 Vp-p
10.5 
µ
s
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

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