Sony STR-DB840 Service Manual

1414
• 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 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 : 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 portant le numéro
spécifié.
C
B
These are omitted.
E
Q
B
These are omitted.
CE
Q
B
These are omitted.
CE
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

Sony STR-DB840 Specifications

General

Digital inputs	2 Optical, 1 Coaxial
Power output	100 watts per channel into 8Ω (stereo)
Frequency response	10Hz to 100kHz
Total harmonic distortion	0.09%
Input sensitivity	2.5mV (MM), 200mV (line)
Speaker load impedance	8 ohms
Dimensions	430 x 157mm
Tuning range	FM, MW
Video Connections	composite