SA SA WX900 Service Manual

SA-WX900
SERVICE MANUAL
Ver 1.1 2004.05
SPECIFICATIONS
AUDIO POWER SPECIFICATIONS For the U.S.A. model
POWER OUTPUT AND TOTAL HARMONIC DISTORTION: With 4 ohm loads, from 20 – 200 Hz; rated 800 watts, minimum RMS power, with no more than 0.8 % total harmonic distortion from 250 milliwatts to rated output.
US Model
Canadian Model
AEP Model
UK Model
Inputs
Input jacks
LINE IN: input pin jack SPEAKER IN: input terminals
Output jacks
LINE OUT: output pin jack SPEAKER OUT: output terminals
System
Type
Active Subwoofer, magnetically shielded (closed cabinet)
Speaker units
Woofer : 30 cm dia. (12 in.), cone type x 2
Continuous RMS output
North American model (4 ohms/100Hz, 0.8%) : 1,000 W European model (DIN 4 ohms/100Hz, 0.8%) : 1,000 W
Reproduction frequency range
20 Hz – 200 Hz
High frequency cut-off frequency
50 Hz – 200 Hz
Phase selector
NORMAL, REVERSE
Mode selector
MOVIE, MUSIC BASS-BOOST OFF, 1, 2
General
Power requirements
North American model : 120 V AC, 60 Hz European model : 220 – 240 V AC, 50 Hz Other models : 220 – 240 V AC, 50 Hz
Power consumption
220 W less than 0.5 W (Standby mode)
Dimensions
Approx. 440 x 550 x 620 mm (17 3/8 x 21 7/8 x 24 1/2 in.) (w/h/d)
Mass
48 kg (105lb 14oz)
Supplied accessories
Audio connecting cord (1 phono plug – 1 phono plug) (1) Speaker cords (2) Spike Design and specifications are subject to change without notice.
9-961-097-02
2004E02-1
ACTIVE SUBWOOFER
Sony Corporation
Home Audio Company
Published by Sony Engineering Corporation
SA-WX900
SAFETY CHECK-OUT
After correcting the original service problem, perform the following safety checks 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
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. Follow the manufacturers’ instructions to use these instruments.
2. A battery-operated AC 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 low-voltage scale. The Simpson 250 and Sanwa SH-63Trd are examples of a passive VOM that is suitable. Nearly all battery operated digital multimeters that have a 2V AC range are suitable. (See Fig. A)
TABLE OF CONTENTS
Specifications ........................................................................... 1
1. GENERAL ...................................................................... 3
2. DIAGRAMS
2-1. Circuit Boards Location ............................................. 4
2-2. Schematic Diagram – Filter Section – ........................ 5
2-3. Printed Wiring Board – Filter Section – ..................... 6
2-4. Schematic Diagram – Power Section – ...................... 7
2-5. Printed Wiring Board – Power Section –.................... 8
3. EXPLODED VIEWS
3-1. Amp Section ............................................................... 9
3-2. Cabinet Section ......................................................... 10
4. ELECTRICAL PARTS LIST....................................11
To Exposed Metal Parts on Set
0.15µF
1.5k
Earth Ground
AC voltmeter (0.75V)
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 MANUAL OR IN SUPPLEMENTS PUB­LISHED BY SONY.
ATTENTION AU COMPOSANT AYANT RAPPORT
À LA SÉCURITÉ!!
LES COMPOSANTS IDENTIFIÉS PAR 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
PHASE MODECUT OFF FREQUENCYLEVEL
POWER SAVE
NORM
OFF
REVERSE200Hz50HzMAXMIN AUTO
MUSIC
MOVIE
SECTION 1

GENERAL

BOOST
2 1 OFF
SA-WX900
This section is extracted from instruction manual.
ON/STANDBY
POWER
LEVEL
CUT OFF FREQUENCY
PHASE
POWER SAVE
MODE
BOOST
POWER indicator
POWER
3
SA-WX900
d
SECTION 2

DIAGRAMS

THIS NOTE IS COMMON FOR SCHEMATIC DIAGRAMS. (In addition to this, the necessary note is printed in each block.)
For Schematic Diagrams. Note:
• 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/
C : panel designation.
Note:
The components identi­fied by mark 0 or dotted line with mark 0 are criti- cal for safety. Replace only with part number specified.
A : B+ Line.
B : B– Line.
•Voltages are dc with respect to ground under no-signal conditions.
• no mark : Power on
•Voltages are taken with a VOM (Input impedance 10 MΩ). Voltage variations may be noted due to normal production tolerances.
• Signal path. F : AUDIO
• Abbreviation CND : Canadian model
4
W or less unless otherwise 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.
For printed wiring boards.
Note:
X : parts extracted from the component side.
• Abbreviation
: Pattern from the side which enables seeing.
CND : Canadian model

2-1. CIRCUIT BOARDS LOCATION

FILTER board
SWITCHING REGULATOR
CONTROL board
SWITCH board
INPUT board
PROTECT board
ICE250-SW
AUTO POWER boar
LINE FILTER board
POWER SW board
4

2-2. SCHEMATIC DIAGRAM –FILTER SECTION –

C103
R109
2.2k
C106 47p
IC101(2/2)
BA4558
C101 220p
D104
1SS133
D103
1SS133
220p
IC101(1/2)
BA4558
C110
C111
R110
2.2k
0.1
0.1
SPEAKER
LINE
D102
1SS133
D101
R106
R102
4.7k 1/2W
R104
C105
D106
1SS133
R105
22k
22k
R107
22k
R108
22k
C102 220p
47k
D105
1SS133
10
50V
R114 100k
R111
R101
4.7k
1/2W
R103
47k
R112
1k
L101
1k
1SS133
C104 220p
TM101
+
R
-
IN
+
L
-
+
R
-
OUT
+
L
-
J101
IN
OUT
C108
C109
SA-WX900
Ver 1.1
RV402
R403
20kB
R404
IC204(1/2)
KIA4558P
C243
0.1
R226
5.6k
R256
C214
0.15
12k
47k
R402
2.2k
C215
0.68
IC205(2/2)
KIA4558P
R230
IC205(1/2)
KIA4558P
C216
0.022
R233
15k
R234
2.2k
C241
0.1
47k
C242
R229
1k
C218
0.001
0.1
C230
10
C232
0.1
50V
C234
C231
0.1
10
50V
CN203
4P
7
47k
2.2k
R401
C213
0.33
R302
22k
SW304
IC203(1/2)
KIA4558P
C206
0.47
KTC3199
C207
0.47
R216
1k
R217
68k
D204
1SS133
R231
RV401
20kB
CN401
7P
CN205
7P
R211
R218
R219
10k
10k
C205
1
C204
R209
1
10k
1k
R214
3.3k
R213
4.7k
C208
0.001
Q201
R232
47k
47k
IC204(2/2)
KIA4558P
IC207
BU4066
R225
4.7k
R215
C212
0.18
10
KTC3199
R224
10k
Q202
R301
22k
CN302
CN206
SW303
4P
4P
SW302
CN301
5P
CN204
5P
IC201(1/2)
R204
10k
IC206(1/2)
BA4558
BPF
KIA4558P
R253
4.7k
R205
IC201(2/2)
R250
15k
R251
KIA4558P
R201
10k
R202
10k
R203
6.8k
C201 100p
C222
0.01
R252
33k
C221
0.01
22k
CN201
CN101
10 50V
10 50V
5P
SW301
C203
10
50V
IC202(1/2)
KIA4558P
IC203(2/2)
R208
10k
R207
47k
R255
BUFFER
KIA4558P
R220
6.8k
C211
0.001 R210
10
R223
C209
C210
R221
680
47k
IC206(2/2)
BA4558
1k
1
1
R222 100k
C202
10
50V
10k
R206
47k
R254
47k
C223
10
50V
R240
10k
C219
0.0015
IC202(2/2)
KIA4558P
R242
150
D201
1SS133
C220
10
50V
R244 100k
R245
R241
10k
D202
1SS133
R246
10k
D203
1SS133
Q203
R247
47k
KTA1267
R248
47k
10k
R249
D205
1SS133
22k
Q204
KTC3199
C240
C239
0.1
0.1
C236
C235
C237
C238
10
10
50V
0.1
50V
0.1
CN202
XH5P
7
55
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