CMT-EP303, HCD-EP303 - Sony Audio Service Manual (repair manual). Page 17

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17
17
HCD-EP303

Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted.  p: pF.
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.
Note on Printed Wiring Board:
•
W
: indicates side identified with part number.
•
: Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
• Indication of transistor
•
A
: B+ Line.
•
H
: adjustment for repair.
• 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.
no mark : FM
<
> : CD (STOP)
• Circled numbers refer to waveforms.
• Signal path.
F
: FM
f
: AM
E
: PB (TAPE)
a
: REC (TAPE)
J
: CD PLAY
• Abbreviation
E51
: Chilean and Peruvian model.
MY
: Malaysia model.
SP
: Singapore model.
AR
: Argentine model.
MX
: Mexican model.
AUS
: Australian 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
piéce por tant le numéro
spécifié.
• WAVEFORMS
– MAIN Board –
– CASSETTE Board –
– DISPLAY Board –
1
 IC102 
ws
 (XOUT)
3.4 Vp-p
139 ns
1 V/DIV, 40 ns/DIV
2
 Q705 (Collector)
(RECORD mode)
2 V/DIV, 4 
µ
s/DIV
3
 IC601 
tl
 (X2)
1 V/DIV, 100 ns/DIV
6.0 Vp-p
12.4 
µ
s
5.2 Vp-p
167 ns
B
These are omitted.
C
E

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