Sony HCD-EC55 Service Manual page 78

HCD-EC55/EC77/GX99
THIS NOTE IS COMMON FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is printed in each block.)
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.
1
• All resistors are in Ω and
specified.
• f : internal component.
• 2 : nonflammable resistor.
• 5 : fusible resistor.
• C : panel designation.
Note:
The components identi-
fied by mark 0 or dot-
ted line with mark 0 are
critical for safety.
Replace only with part
number specified.
• H : adjustment for repair.
• A : B+ Line.
• B : B– Line.
• Voltages are taken with a VOM (Input impedance 10 MΩ).
Voltage variations may be noted due to normal production
tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal production
tolerances.
– HI-AMP/LOW-AMP Section –
No mark: CD STOP
– DECK Section –
No mark: TAPE PLAY or TAPE REC
– Other Section –
No mark: CD PLAY
• Circled numbers refer to waveforms.
• Signal path.
F
: TUNER (FM)
J
: TUNER (AM)
f
: CD
d
: AUDIO
E
: PB (TAPE)
a
: REC (TAPE)
• Abbreviation
AR : Argentine model
AUS : Australian model
CND : Canadian model
E2 : 120 V AC area in E model
E3 : 240 V AC area in E model
E51 : Chilean and Peruvian models
KR : Korean model
MX : Mexican model
RU : Russian model
SP : Singapore model
• Waveforms
– MAIN Board –
1
IC801 w; (XOUT)
13.3 µ s
500 mV/DIV, 4 µ s/DIV
2
DIAGRAMS
/ W or less unless otherwise
4
Note:
Les composants identifiés
par une marque 0 sont cri-
tiques pour la sécurité.
Ne les remplacer que par une
piéce portant le numéro
spécifié.
– PANEL Board –
1
IC301 qd (X0A)
1.5 Vp-p
500 mV/DIV, 10 µ s/DIV
Note on Printed Wiring Boards:
• X : parts extracted from the component side.
• Y : parts extracted from the conductor side.
• f : internal component.
• : Pattern from the side which enables seeing.
Caution:
Pattern face side: Parts on the pattern face side seen from
(Side B) the pattern face are indicated.
Parts face side: Parts on the parts face side seen from
(Side A) the parts face are indicated.
• Indication of transistor.
C
Q
These are omitted.
B E
Q
B C E
These are omitted.
2
2.1 Vp-p
30.5 µ s
1 V/DIV, 100 ns/DIV
IC301 od (X0)
2.5 Vp-p
198 ns