Sony SAWP-780 Service manual
SA-WP780
SERVICE MANUAL
Ver. 1.4 2007.05
• SA-WP780 is the sub woofer section in
HT-7000DH/7100DH/DDW780/DDW880/
DDW885/DDW900/DDW990/DDW995/
HTP-36DW.
AUDIO POWER SPECIFICATIONS
POWER OUTPUT AND TOTAL HARMONIC
DISTORTION:
(Models of area code US o nly)
With 6 ohm loads, from 28 – 200 Hz; rated 120
watts, minimum RMS power, with no more than
0.7% total harmonic distortion f rom 250
milliwatts to rated output.
Speaker system Active subwoofer,
Speaker unit 200 mm (7 7/8 inches)
Enclosure type Acoustically loaded bass
RMS output
Models of area code US, CND
Mod
els of other area code 120 W (6 ohms, 100 Hz,
Music power
Models of area code US, CND
Models of other area code
Input LINE IN (input pin jacks)
magnetically shielded
cone type
reflex
150 W (6 ohms, 100 Hz,
THD 10%)
THD 10%
200 W
190 W
)
Photo: SILVER
SPECIFICATIONS
US Model
Canadian Model
AEP Model
UK Model
E Model
Australian Model
Power requirements
Area code Power requirements
US, CND 120 V AC, 60 Hz
AEP, UK, RU 230 V AC, 50/60 Hz
AUS 240 V AC, 50 Hz
SP, SP6, AR 230 – 240 V AC,
50/60 Hz
E51 120/220/240 V AC,
50/60 Hz
Dimensions (w/h/d) (Approx. )
270 × 331 × 380 mm
(10 5/8 × 13 × 15 inches)
Mass (Approx.) 8.3. kg (18 lb 5 oz)
Design and specifications are subject to change
without notice.
•Abbreviation
AR : Argentine model
AUS:Australian model
CND : Canadian model
E51 : Chilean and Peruvian models
RU : Russian model
SP : Singapore model
SP6 : Singapore and Malaysia models
9-887-104-05
2007E16-1
© 2007.05
ACTIVE SUBWOOFER
Sony Corporation
Home Audio Division
Published by Sony Techno Create Corporation
SA-WP780
r
SAFETY CHECK-OUT
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 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 manuf acturers’ 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 v oltmeter. The “limit” indication
is 0.75 V, so analog meters must hav e an accurate low-v oltage
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 2 V A C range are suitable. (See
Fig. A)
To Exposed Metal
Parts on Set
AC
0.15 µF
1.5 k
Ω
Earth Ground
voltmete
(0.75 V)
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 IDENTIFIÉS PAR UNE MARQUE 0 SUR
LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES
PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ DE
FONCTIONNEMENT. NE REMPLACER CES COM- POSANTS
QUE PAR DES PIÈCES SONY DONT LES NUMÉROS SONT
DONNÉS DANS CE MANUEL OU D ANS LES SUPPLÉMENTS
PUBLIÉS PAR SONY.
SECTION 1
DIAGRAMS
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.
• a : Through hole.
• : Pattern from the side which enables seeing.
• Indication of transistor.
C
B
B
Q
B
E
CE
Q
CE
These are omitted.
These are omitted.
These are omitted.
• Circuit Boards Location
Note on Schematic Diagrams:
• All capacitors are in µF unless otherwise noted. (p: pF) 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/
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.
• A : B+ Line.
• B : B– Line.
•Voltages and 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
AR : Argentine model
AUS: Australian model
CND : Canadian model
E51 : Chilean and Peruvian models
RU : Russian model
SP : Singapore model
SP6 : Singapore and Malaysia models
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.
SA-WP780
Ver. 1.3
LED board
INPUT CONTROL board
SWITCH board
MAIN board
POWER TRANS board
3
SA-WP780
• IC Block Diagrams
– MAIN Board –
IC202, IC203 NJM4565D
V+
8
A OUTPUT
A -INPUT
A +INPUT
V-
1
A B
2
3
4
IC500 uPC1237C-A
OFF AC
4
SWITCH FOR
LATCH/AUTOMATIC
AC-OFF
DETECTOR
RESET
RESET
3
FLIP-FLOP
B OUTPUT
7
B -INPUT
6
B +INPUT
5
DETECT DC
2
OUTPUT
OFFSET
DETECTOR
LOADOVER
1
OVERLOAD
DETECTOR
5
GND
OUTPUT
OFFSET
DETECTOR
6
DRIVER
RELAY
OUTPUT
OFFSET
DETECTOR
7
OFF AC
8
VCC
4
1-1. BLOCK DIAGRAM
SA-WP780
J101
(AUDIO IN)
RV801
(VOL)
IC202 (1/2)
BUFFER
IC203 (1/2)
AMP
IC203 (2/2)
AMP
+V
-V
Q102
+V REG
Q103
-V REG
IC202 (2/2)
AMP
Q301, Q311
CURRENT REGULATOR
Q302, Q304
PRE DRIVE
Q303, Q305
CURRENT MIRROR
IC500
PROTECTION
DRIVER
RELAY
LOAD
OVER
OFF
RY301
Q307 - Q310
AMP
Q731
SWITCH
D505
1
6
4
AC
D504
Q505
SWITCH
RELAY
D901
(POWER)
SP1
(SPEAKER)
D402
RECT
+B
-B
+V
D801 - D804
RECT
T1
POWER
TRANSFORMER
F901
F900
F902
S2
VOLTAGE
SELECTOR
E51
AC
IN
Signal Path
: AUDIO
SA-WP780
55
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