Sony SAWMSP-76 Service manual
SA-WMSP76
SERVICE MANUAL
Ver 1.1 2004.07
• SA-WMSP76 is the sub woofer section in
HT-DDW755/760 and HT-4800DP.
SPECIFICATIONS
Speaker system Active subwoofer,
magnetically shielded
Speaker unit 200 mm cone type
Enclosure type Acoustically loaded bass
reflex
RMS output: 100 W (6 ohms, 100 Hz,
THD 10%)
Input LINE IN (input pin jacks)
US Model
Canadian Model
AEP Model
UK Model
E Model
Australian Model
Power requirements
Area code Power requirements
US, CA 120 V AC, 60 Hz
CEL, CEK, MY, SP, AU 230 V AC, 50/60 Hz
Power consumption 75 W
Dimensions (w/h/d) (Approx.)
Mass (Approx.) 9.0 kg (19 lb 14oz)
270 × 325 × 398 mm
(10 3/4 × 12 7/8 × 15 3/4
inches) including front
panel
•Abbreviation
AU : Australian model
CA : Canadian model
CEK : UK model
CEL : AEP model
MY : Malaysia model
SP : Singapore model
9-877-667-02
2004G16-1
© 2004.07
ACTIVE SUBWOOFER
Sony Corporation
Home Audio Company
Published by Sony Engineering Corporation
SA-WMSP76
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 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)
To Exposed Metal
Parts on Set
Unleaded solder
Boards requiring use of unleaded solder are printed with the leadfree mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with
the lead free mark due to their particular size.)
: LEAD FREE MARK
Unleaded solder has the following characteristics.
• Unleaded solder melts at a temperature about 40°C higher than
ordinary solder.
Ordinary soldering irons can be used but the iron tip has to be
applied to the solder joint for a slightly longer time.
Soldering irons using a temperature regulator should be set to
about 350°C.
Caution: The printed pattern (copper foil) may peel away if the
heated tip is applied for too long, so be careful!
• Strong viscosity
Unleaded solder is more viscous (sticky, less prone to flow)
than ordinary solder so use caution not to let solder bridges
occur such as on IC pins, etc.
• Usable with ordinary solder
It is best to use only unleaded solder but unleaded solder may
also be added to ordinary solder.
0.15µF
Ω
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 .
2
ATTENTION AU COMPOSANT AYANT RAPPORT
À LA SÉCURITÉ!
LES COMPOSANTS IDENTIFÉS P AR UNE MARQUE 0 SUR LES
DIAGRAMMES SCHÉMA TIQUES 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.
SECTION 1
D
DIAGRAMS
SA-WMSP76
THIS NOTE IS COMMON FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is printed in each block.)
Note on Printed Wiring Boards:
• X : parts extracted from the component side.
• Y : parts extracted from the conductor side.
• a : Through hole
• : Pattern from the side which enables seeing.
Caution:
Pattern face side: Parts on the pattern face side seen from
(Side B) the pattern face are indicated.
Parts face side: Par ts on the parts face side seen from
(Side A) the parts face are indicated.
• Indication of transistor
B
CE
These are omitted.
Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted. p: µµF 50 WV
or less are not indicated except for electrolytics and tantalums.
• 2 : nonflammable resistor.
• 5 : fusible resistor.
• All resistors are in Ω and 1/4 W or less unless otherwise specified.
• C : panel designation.
The components identified by
mark 0 or dotted line with mark
0 are critical 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 10MΩ).
Voltage variations may be noted due to normal preduction tolerances.
• Signal path.
F : AUDIO
• Abbreviation
CND : Canadian model.
Les composants identifiés par
une marque 0 sont critiques
pour la sécurité.
Ne les remplacer que par une
pièce portant le numéro spécifié.
• IC BLOCK DIAGRAMS
IC301-STK404-100S (MAIN Board)
1 2 3 4 5 6 7 8 9 10 11 12
SUB
1-1. CIRCUIT BOARD LOCATION
SWITCH BOARD
INPUT(CONTROL) BOARD
MAIN BOARD
POWER TRANS BOAR
CONTROL BOARD
33
SA-WMSP76
1-2. PRINTED WIRING BOARD – MAIN SECTION –
12
A
B
(Page 5)
C
• See page 3 for Circuit Board Location • : Uses unleaded solder.
345678
4
1
4
1
5
IC203
8
5
IC202
8
(US,CND)
()
D
E
F
(Page 5)
SP1
POWER TRANS
(Page 5)
INPUT
IC301
• Semiconductor
Location
Ref. No. Location
D205 C-3
D206 C-3
D301 E-4
D302 E-4
D304 D-2
D401 F-2
D501 E-2
D502 E-4
D602 C-2
IC202 C-3
IC203 B-3
3
1-686-985-
IC301 D-4
Q501 D-2
Q502 D-2
Q503 D-2
Q504 D-2
Q505 E-4
G
11
(11)
44
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