SA-WX90 - Sony Audio Service Manual (repair manual). Page 3

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3
3
SECTION 2
DIAGRAMS
• Location of controls
Note on Printed Wiring Board:
X
: parts extracted from the component side.
Y
: parts extracted from the conductor side.
b
: Pattern from the side which enables seeing.
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.
• All resistors are in 
 and 
1
/
4
 
W or less unless otherwise
specified.
C
: panel designation.
U
: B+ Line.
V
: B– Line.
• Voltages are dc with respect to ground under no-signal
conditions.
no mark : Power on
: Impossible to measure
• Voltages are taken with a VOM (Input impedance 10 M
).
Voltage variations may be noted due to normal produc-
tion tolerances.
• Signal path.
F
: AUDIO
• Abbreviation
G
: German model
MY
: Malaysia model
SP
: Singapore model
• Circuit Boards Location
Note: The components identified by mark 
0
 or dotted line
with mark 
0
 are critical for safety.
Replace only with part number specified.
2-1.  NOTE FOR PRINTED WIRING BOARD AND SCHEMATIC DIAGRAM
MAIN board
POWER SW CE board
(not supplied)
CONTROL board
(not supplied)
POWER SUPPLY board
(not supplied)
TRANS (SEC) board
(not supplied)
TRANS (PRI) board
(not supplied)
POWER (IC) board
(not supplied)
– Front View (a part) –
SECTION 1
GENERAL
– Upper View (a part) –
– Rear View (a part) –
POWER
POWER indicator
LEVEL
PHASE
CUT OFF FREQ
LEVEL
MIN
MAX
CUT OFF FREQ
50Hz
PHASE
120Hz
REVERSE
NORMAL
 LINE IN
SPEAKER OUT
LINE OUT
 SPEAKER IN
POWER SAVE
IN
OUT
IN
OUT
OFF
AUTO
LINE
L
SPEAKER
POWER SAVE
R
L
R
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