Sony SAWP-785 Service manual

SA-WP785

SERVICE MANUAL

Ver. 1.0 2007.04

• SA-WP785 is the sub woofer section in HT-DDW785.

SPECIFICATIONS

Speaker system Active subwoofer,

magnetically shielded Speaker unit 200 mm cone type Enclosure type Acoustically loaded bass

reflex RMS output 190 W Input

LINE IN (input pin jacks)

E Model

Australian Model

Power requirements

Area code Power requirements

AUS 240 V AC, 50Hz SP 230 – 240 V AC, 50/60 Hz

Power consumption 80 W Dimensions (w/h/d) (Approx.)

270 × 330 × 373 mm

including front panel Mass (Approx.) 8.3 kg

Design and specifications are subject to change without notice.

•Abbreviation

AUS : Australian model SP : Singapore model

ACTIVE SUBWOOFER

9-887-652-01

Sony Corporation

Home Audio Division Published by Sony Techno Create Corporation

SA-WP785

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 viscou-s (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.

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.

SECTION 1

POWER TRANS board

MAIN board

INPUT CONTROL board

SWITCH board

LED board

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.

These are omitted.

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 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 AUS: Australian model SP : Singapore model

W or less unless otherwise

SA-WP785

• Circuit Boards Location

SA-WP785

• IC Block Diagrams

– MAIN Board –

IC202, IC203 NJM4565D

V+

A OUTPUT

A -INPUT

A +INPUT

V-

A B

IC500 uPC1237C-A

OFF AC 4

SWITCH FOR

LATCH/AUTOMATIC

AC-OFF

DETECTOR

RESET

RESET 3

FLIP-FLOP

B OUTPUT

B -INPUT

B +INPUT

DETECT DC 2

OUTPUT

OFFSET

DETECTOR

LOADOVER 1

OVERLOAD DETECTOR

GND

OUTPUT

OFFSET

DETECTOR

DRIVER

RELAY

OUTPUT

OFFSET

DETECTOR

OFF AC

VCC

1-1. BLOCK DIAGRAM

SA-WP785

J101

(AUDIO IN)

RV801

(VOL)

IC202 (1/2)

BUFFER

IC203 (1/2)

AMP

IC203 (2/2)

AMP

-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

D504

Q505

SWITCH

RELAY

D901

(POWER)

SP1

(SPEAKER)

D402 RECT

-B

D801 - D804

RECT

POWER

TRANSFORMER

F901

S901

(POWER)

AC IN

Signal Path

: AUDIO

SA-WP785

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