Sony HCD-GX255 Service Manual page 25

• Note For Printed Wiring Boards and Schematic Diagrams
Note on Printed Wiring Board:
• X : parts extracted from the component side.
• Y : parts extracted from the conductor side.
•
f : internal component.
•
: Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
Caution:
Pattern face side: Parts on the pattern face side seen from
(Conductor Side) the pattern face are indicated.
Parts face side: Parts on the parts face side seen from
(Component Side) the parts face are indicated.
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.
HCD-GX255/RG170/RG470
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 / W or less unless otherwise
4
specified.
•
f : internal component.
• 2 : nonflammable resistor.
• 5 : fusible resistor.
• C : panel designation.
Note: Note:
The components identi- Les composants identifiés par
fied by mark 0 or dotted une marque 0 sont critiques
line with mark 0 are criti-
pour la sécurité.
cal for safety. Ne les remplacer que par une
Replace only with part pièce por tant le numéro
number specified. spécifié.
• A : B+ Line.
• B : B– Line.
• Voltages and waveforms are dc with respect to ground
under no-signal conditions.
– CD/BD Section –
no mark :CD PLAY
– CD-G Section –
no mark : CD-G PLAY
– Other Sections –
no mark : FM
( ) : CD PLAY
〈〈 〉〉 : TAPE PLAY
[ ] : TAPE REC
∗
: Impossible to measure
• Voltages are taken with a VOM (Input impedance 10 MΩ).
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
: TUNER (FM/AM)
E
: TAPE PLAY (DECK A)
d
: TAPE PLAY (DECK B)
G : REC
J : CD PLAY
f : AUX IN
N : MIC
L : VIDEO
• Abbreviation
AR : Argentina 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
EA : Saudi Arabia model
EE : East European model
MX : Mexican model
RU : Russian model
• Circuit Boards Location
CD-G board (MX)
SW board
MOTOR (LD) board
MIC board
(E2, E51, AR, MX)
AC1 board
(GX255/RG170/RG470: AEP, EE, RU)
TRANSFORMER board
PANEL board
VOL board
AUDIO IN board
HEADPHONE board
25 25
HCD-GX255/RG170/RG470
BD board (MX)/
CD board (EXCEPT MX)
SENSOR board
DRIVER board
MOTOR (TB) board
SUB TRANS board
VIDEO OUT board (MX)
MAIN board
POWER board
MAIN board