HCD-EC55, HCD-EC77, HCD-GX99 - Sony Audio Service Manual (repair manual). Page 2

2

Note on Schematic Diagram:
• All capacitors are in 

µ

F 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.

•         

f

: internal component.

•

2

: nonflammable resistor.

•

5

: fusible resistor.

•

C

: panel designation.

•

H

: adjustment for repair.

•

A

: B+ Line.

•

B

: B– Line.

• Voltages are taken with a VOM (Input impedance 10 M

Ω

).

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

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.

• Indication of transistor.

The components identi-
fied by mark 

0

  or dot-

ted line with mark 

0

 are

critical for safety.
Replace only with part
number specified.

Les composants identifiés
par une marque 

0

  sont cri-

tiques pour la sécurité.
Ne les remplacer que par une
piéce portant le numéro
spécifié.

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.

C

B

These are omitted.

E

Q

B

These are omitted.

C

E

Q