Sony SAW-303 Service manual
SA-W11/W303/W305
SERVICE MANUAL
Ver 1.1 2001.11
Photo: SA-W305
SPECIFICATIONS
US Model
SA-W303/W305
Canadian Model
AEP Model
UK Model
E Model
SA-W11/W305
Australian Model
Chinese Model
Power requirements
Where purchased Power requirements
US, Canadian model 120 V AC, 60 Hz
AEP, UK, German,
East European model
E, Australian, Chinese, 110 – 120/220 – 240 V AC,
Malaysia, Singapore model adjustable, 50/60 Hz
220 – 230 V AC, 50/60 Hz
SA-W305
SA-W305
SA-W11
9-922-813-12 Sony Corporation
2001K0500-1 Home Audio Company
C 2001.11 Published by Sony Engineering Corporation
ACTIVE SUPER WOOFER
SAFETY CHECK-OUT
r
After correcting the original service problem, perform the following safety check before releasing the set to the customer:
Check the antenna terminals, metal trim, “metallized” knobs,
screws, and all other exposed metal parts for AC leakage.
Check leakage as described below.
LEAKAGE TEST
The AC leakage from any exposed metal part to earth ground and
from all exposed metal parts to any exposed metal part having a
return to chassis, must not exceed 0.5 mA (500 microampers.).
Leakage current can be measured by any one of three methods.
1. A commercial leakage tester, such as the Simpson 229 or RCA
WT -540A. Follo w the manufacturers’ instructions to use these
instruments.
2. A battery-operated A C milliammeter. The Data Precision 245
digital multimeter is suitable for this job.
3. Measuring the voltage drop across a resistor by means of a
VOM or battery-operated AC voltmeter. The “limit” indication is 0.75 V, so analog meters must have an accurate lowvoltage scale. The Simpson 250 and Sanwa SH-63T rd are examples of a passive VOM that is suitable. Nearly all battery
operated digital multimeters that have a 2 V A C range are suitable. (See Fig. A)
To Exposed Metal
Parts on Set
1.5 k
0.15 µF
Fig. A. Using an AC voltmeter to check AC leakage.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED
LINE WITH MARK 0 ON THE SCHEMATIC DIAGRAMS
AND IN THE PARTS LIST ARE CRITICAL TO SAFE
OPERATION. REPLACE THESE COMPONENTS WITH
SONY PARTS WHOSE PART NUMBERS APPEAR AS
SHOWN IN THIS MANU AL OR IN SUPPLEMENTS PUBLISHED BY SONY.
Ω
Earth Ground
AC
voltmete
(0.75 V)
ATTENTION AU COMPOSANT AYANT RAPPORT
À LA SÉCURITÉ!
LES COMPOSANTS IDENTIFIÉS P AR UNE MARQUE 0
SUR LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE
DES PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ
DE FONCTIONNEMENT. NE REMPLACER CES COMPOSANTS QUE PAR DES PIÈCES SONY DONT LES
NUMÉROS SONT DONNÉS DANS CE MANUEL OU
DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.
– 2 –
• Location of Controls
FRONT
SECTION 1
GENERAL
SECTION 2
DIAGRAMS
THIS NOTE IS COMMON FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is each block.)
REAR
POWER
switch
LEVEL
knob
CUT OFF FREQ
knob
PHASE
button
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 Ω and 1/
specified.
4
W or less unless otherwise
• 2 : nonflammable resistor.
• C : panel designation.
Note:
The components identified by mark 0 or dotted
line with mark 0 are critical 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
piéce portant le numéro
spécifié.
• U : B+ Line.
• V : B– Line.
• Voltages are dc with respect to ground under no-signal
conditions.
• Voltages are tak en with a V OM (Input impedance 10 MΩ).
Voltage variations may be noted due to normal production tolerances.
• Signal path.
F
Note on Printed Wiring Boards:
• X : parts extracted from the component side.
Abbreviation:
AUS : Australian
CH : Chinese
CND : Canadian
EE : East European
G : German
MY : Malaysia
SP : Singapore
IN
IN
+
L
–
–
R
+
SPEAKER
LINE
OUT
OUT
• IC Block Diagram
IC302 µPC1237HA
LINE
IN/OUT jack
+
L
–
–
R
+
SPEAKER IN/OUT
terminal
OVER LOAD DET
OFFSET DET
LATCH/
AUTORESET
1 2 3
CC ON
V
F/F
MUTE
AC OFF
DET
4 5 6 7 8
CC
V
VOLTAGE SELECTOR switch
(E, Australian, Singapore,
Chinese, Malaysia)
– 3 –
– 4 –
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