Sony SAVA-27 Service manual

SAVA-27

SERVICE MANUAL

(Rear) (R-ch) (L-ch)

SPECIFICATIONS

US Model

Canadian Model

AEP Model

UK Model

E Model

Australian Model

Chinese Model

MICROFILM

— Continued on next page —

HOME THEATER ACTIVE SPEAKER SYSTEM

TABLE OF CONTENTS

TEST MODE ·································································· 3

1. GENERAL ······································································ 4

2. DISASSEMBLY

2-1. Removal Amplifier Block ·················································· 5

3. DIAGRAMS

3-1. Circuit Boards Location ····················································· 6 3-2. Schematic Diagram —Main Section — ·····························7 3-3. Printed Wiring Board —Main Section — ························ 11 3-4. Schematic Diagram —Display Section — ·······················14 3-5. Printed Wiring Board —Display Section — ···················· 17 3-6. IC Pin Function ································································ 20 3-7. IC Block Diagrams ··························································· 21

4. EXPLODED VIEWS

4-1. System (L) Assy ······························································· 23 4-2. System (R) Assy ······························································· 24 4-3. Amplifier Section ····························································· 25 4-4. Rear Speaker Section························································ 26

5. ELECTRICAL PARTS LIST ··································· 27

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 A C 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 microampers). 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. Follo w 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 v oltmeter . The “limit” indication is 0.75 V, so analog meters must have an accurate low-v oltage scale. The Simpson 250 and Sanwa SH-63Trd are e xamples 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

0.15

F 1.5k

Ω

voltmeter (0.75V)

Earth Ground

Fig. A. Using an AC voltmeter to check AC leakage .

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK ! OR DOTTED LINE WITH MARK ! 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

— 2 —

À LA SÉCURITÉ! LES COMPOSANTS IDENTIFÉS P AR UNE MARQUE ! 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.

SAVA-27

TEST MODE

MODE ALL FLUORESCENT INDICATOR TUBES LIGHT

When the A C plug is inserted to the po wer outlet with pressing the MASTER VOL + button, the all fluorescent indicator tubes light.

KEY CHECK, LED LIGHTING MODE

1. Pull out the AC plug from the power outlet and turn the power OFF.

2. Connect the lead wire to TP3 on the KEY board.

3. Insert the AC plug to the power outlet and set to STANDBY mode.

4. Let the lead wire connected in step 1 contact to the ground.

5. All fluorescent indicator tubes light, and enter the key check mode.

6. Pressing any buttons, the number of button will be displayed on the fluorescent indicator tube.

7. After all buttons are pressed, it will be in the STANDBY mode.

Button

POWER MASTER VOL– MASTER VOL + INPUT SURROUND CTR MODE S.WOOFER

Button Number

2 3 4 5 6 7 8

LED Color

Red

Green

Red

Green

Red

Green

Red

SECTION 1

GENERAL

This section is extracted from instruction manual.

1 LEFT CHANNEL SPEAKER/CENTER CHANNEL WOOFER 2 CENTER CHANNEL TWEETERS 3 RIGHT CHANNEL SPEAKER/CENTER CHANNEL WOOFER 4 SUPER WOOFER 5 REAR SPEAKER

2-1. REMOVAL AMPLIFIER BLOCK

Display panel assembly

Four tapping screws

(4×20)

Flat type wire

(27core)

Grill frame assembly

SECTION 2

DISASSEMBLY

!§

One connector

PS Board

SDN651

!∞

!¶

Amplifier

Back panel

!¡

6P connector

5th tapping screws (4×16)

8th tapping screws

(4×16)

!º

Three tapping screws (4×16)

3-1. CIRCUIT BOARDS LOCATION

MAIN board

DISPLAY board

KEY board

SECTION 3

DIAGRAMS

INPUT board

POW-SW board

POWER board

POW-SR board

POW-CN board POW-L board

POW-R board

DOLBY board

PS board

T1 board

T2 board

Note:

1. The LED (D505)lights while pressing each button. The LED lights in red when ever number of buttons are pressed, and it lights in green when odd number of buttons are pressed.

2. The LED lights even when the pressed button is pressed again.

• Parts Location

[KEY BOARD] — Conductor side —

IC503

S506

TP3

CN552

R557

7 8

!º !¡

!™

!•

!¶

!§

!∞

!¢

!£

!ª @º @¡

6 THEATER 7 PRO LOGIC 8 STADIUM 9 GAME !º INPUT1 !¡ INPUT2 !™ MUTING !£ MASTER VOL !¢ SUPER WOOFER MODE (1, 2, OFF) !∞ SUR OFF !§ HALL !¶ POWER

!• POWER !ª STANDBY indicator @º ON/READY indicator @¡ VOLUME @™ S.WOOFER @£ Remote Sensorg @¢ SURROUND @∞ INPUT

Ornament frame

Front frame assembly

Three tapping screws

(4×20)

!™

5th screws

(BVTP 3×8)

!£

Four screws

(BVTP 3×8)

!¢

T wo screws

(BVTP 3×8)

– 3 –

@™@£@¢@∞

– 4 – – 5 –

– 6 –

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