Sony SAWEX-200 Service manual
SA-WEX200
SERVICE MANUAL
Ver 1.0 2001.09
SA-WEX200 is sub woofer in CMT-EX200.
SPECIFICATION
Amplifier section
For the U.S.model
AUDIO POWER SPECIFICATIONS
POWER OUTPUT AND TOTAL HARMONIC
DISTORTION:
With 4 ohms loads,from 50 – 150 Hz;rated 30 watts
per channel minimum RMS power,with no more than
10%total harmonic distortion from 250 milli watts to
rated output.
Canadian model:
Continuous RMS power output (reference):
30 watts
(4 ohms at 55 Hz,10%
THD)
Speaker system Active sub woofer
(magnetically shielded
design)
US Model
Canadian Model
Speaker unit 10 cm dia,cone type
woofer (x2)
Practical maximum output 30 watts
Reproduction frequency range
45 – 150 Hz
High frequency cut-off range
70 – 150 Hz
Phase selector Normal,reverse
Input SPEAKER INPUT:
Input terminal
Output SPEAKER OUTPUT:
Output terminal
Power requirements 120 V AC,60 Hz
Power consumption 40 watts
Dimensions Approx.150 x 220 x
345 mm (w/h/d,incl.
projecting parts and
controls)
Mass Approx.6.2 kg
Design and specifications are subject to change
without notice.
9-873-267-01
2001I0200-1
© 2001.9
ACTIVE SUBWOOFER
Sony Corporation
Home Audio Company
Shinagawa Tec Service Manual Production Group
1
SA-WEX200
SAFETY CHECK-OUT
(US model)
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 microamperes).
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
1. GENERAL .......................................................................... 3
2. DIAGRAMS
2-1. Circuit Boards Location ........................................................ 3
2-2. Printed Wiring Board ............................................................ 4
2-3. Schematic Diagram ............................................................... 5
3. EXPLODED VIEW
3-1. Front Section ......................................................................... 6
4. ELECTRICAL PARTS LIST ......................................... 6
To Exposed Metal
Parts on Set
0.15µF
1.5kΩ
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.
2
ATTENTION AU COMPOSANT AYANT RAPPORT
À LA SÉCURITÉ!
LES COMPOSANTS IDENTIFÉS 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 PIÈSES SONY
DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU
DANS LES SUPPÉMENTS PUBLIÉS PAR SONY.
• Location of controls
d
SECTION 1
GENERAL
This section is extracted from
instruction manual.
SA-WEX200
SECTION 2
DIAGRAMS
THIS NOTE IS COMMON FOR PRINTED WIRING BOARDS AND
SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is printed in each block.)
Sub Woofer
For printed wiring boards.
Note:
• X : parts extracted from the component side.
• b : Pattern from the side which enables seeing.
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 Ω and 1/
specified.
• 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.
• : B+ Line.
• : 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 10MΩ).
Voltage variations may be noted due to normal preduction
tolerances.
• Signal path.
K : AUDIO
4
W or less unless otherwise
Note:
Les composants identifiés par
une marque 0 sont critiques
pour la sécurité.
Ne les remplacer que par une
piéce portant le numéro
spécifié.
CUT OFF FREQ 3 (15)
LEVEL 1 (15)
PHASE 4 (15)
Power indicator 2
2-1. Circuit Boards Location
POWER AMP board
FRONT board
AC board
MAIN boar
33
INPUT board
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