STR-DB840, STR-DB940 - Sony Audio Service Manual (repair manual). Page 14

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14
14
• Circuit Boards Location
4-4.
NOTE  FOR  PRINTED  WIRING  BOARDS  AND  SCHEMATIC  DIAGRAMS

Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted.  pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
•
f
: internal component.
•
2
: nonflammable resistor.
•
C
: panel designation.
•
U
: B+ Line.
•
V
: B– Line.
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : FM
∗
: 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
J
: CD
I
: PHONO
• Abbreviation
AUS
: Australian model
CH
: Chinese 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.
C
B
These are omitted.
E
Q
B
These are omitted.
C
E
Q
B
These are omitted.
C
E
Q

Note on Printed Wiring Board:
•
X
: parts extracted from the component side.
•
Y
: parts extracted from the conductor side.
•
a
: Through hole.
•
b
: 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.
• Indication of transistor
SP board
DC (2) board
AC board
DIGITAL board
5.1 IN board
AU SW board
MUTING board
SW board
DISPLAY board
POWER board
DC (1) board
VIDEO 3 board
BIAS (C) board
BIAS (R) board
BIAS (RS) board
BIAS (LS) board
BIAS (L) board
S-VIDEO board
VIDEO board (DB840)/
OSD board (DB940)
JOINT (1) (Q) board (DB840)/
JOINT (2) (Q) board (DB940)
MAIN board
VOL board
H.P board
• Abbreviation
AUS
: Australian model
CH
: Chinese model
CND : Canadian model
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