SERVICE MANUAL
Sony Corporation
Home Audio Company
Published by Sony Engineering Corporation
US Model
Canadian Model
AEP Model
UK Model
E Model
Australian Model
ACTIVE SUBWOOFER
9-877-667-02
2004G16-1
© 2004.07
Ver 1.1 2004.07
SPECIFICATIONS
SA-WMSP76
· SA-WMSP76 is the sub woofer section in
HT-DDW755/760 and HT-4800DP.
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)
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.)
270
× 325 × 398 mm
(10 3/4
× 12 7/8 × 15 3/4
inches) including front
panel
Mass (Approx.)
9.0 kg (19 lb 14oz)
·Abbreviation
AU
: Australian model
CA
: Canadian model
CEK : UK model
CEL : AEP model
MY : Malaysia model
SP
: Singapore model
2
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)
Unleaded solder
Boards requiring use of unleaded solder are printed with the lead-
free 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.
Fig. A. Using an AC voltmeter to check AC leakage.
0.15µF
To Exposed Metal
Parts on Set
1.5k
AC
voltmeter
(0.75V)
Earth Ground
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 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.
3
3
SA-WMSP76
SECTION 1
DIAGRAMS
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.
·
Indication of transistor
Caution:
Pattern face side: Parts on the pattern face side seen from
(Side B)
the pattern face are indicated.
Parts face side:
Parts on the parts face side seen from
(Side A)
the parts face are indicated.
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 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 and 1/
4 W or less unless otherwise speci-
fied.
·
C : panel designation.
·
A : B+ Line.
·
B : B Line.
·Voltages are dc with respect to ground under no-signal condi-
tions.
no mark : Power on
·Voltages are taken with a VOM (Input impedance 10M).
Voltage variations may be noted due to normal preduction tol-
erances.
·
Signal path.
F
: AUDIO
· Abbreviation
CND
: Canadian model.
· IC BLOCK DIAGRAMS
IC301-STK404-100S (MAIN Board)
B
These are omitted.
CE
1-1. CIRCUIT BOARD LOCATION
SWITCH BOARD
CONTROL BOARD
POWER TRANS BOARD
INPUT(CONTROL) BOARD
MAIN BOARD
1
2
3
4
5
6
7
8
9
10
11
12
SUB
The components identified by
mark 0 or dotted line with mark
0 are critical for safety.
Replace only with part number
specified.
Les composants identifiés par
une marque 0 sont critiques
pour la sécurité.
Ne les remplacer que par une
pièce portant le numéro spécifié.
4
4
SA-WMSP76
1-2. PRINTED WIRING BOARD MAIN SECTION
IC202
IC301
IC203
INPUT
SP1
5
4
1
8
5
4
1
8
(11)
11
POWER TRANS
()
3
(Page 5)
(Page 5)
(Page 5)
12
A
B
C
D
E
F
G
345678
1-686-985-
(US,CND)
· See page 3 for Circuit Board Location
·
: Uses unleaded solder.
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
IC301
D-4
Q501
D-2
Q502
D-2
Q503
D-2
Q504
D-2
Q505
E-4
Ref. No.
Location
· Semiconductor
Location
5
5
SA-WMSP76
1-3. PRINTED WIRING BOARD POWER SECTION
·
: Uses unleaded solder.
· See page 3 for Circuit Board Location
AC
IN
3
(Page 4)
(Page 4)
(Page 4)
12
A
B
C
D
E
F
345678