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
