Sony STRD-760-Z Service manual

STR-D760Z/DE815G

SERVICE MANUAL

Photo : STR-DE815G

US Model

STR-D760Z/DE815G

Canadian Model

E Model

Australian Model

PX Model

STR-DE815G

SPECIFICATIONS

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MICROFILM

FM STEREO FM-AM RECEIVER

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TABLE OF CONTENTS

SAFETY CHECK-OUT

1. SERVICING NOTE

.......................................................... 4

2. GENERAL .......................................................................... 5

3. DISASSEMBLY

3-1. Front Panel .......................................................................... 24

3-2. Balance Board, Display Board and Volume Board.............24

4. ELECTRICAL ADJUSTMENTS ............................... 25

5. DIAGRAMS

5-1. Circuit Boards Location ...................................................... 27

5-2. Block Diagrams

• Dolby Surround Section .................................................. 29

• OSD Section .................................................................... 31

• Power Amp Section .........................................................33

• Panel Section ................................................................... 35

• Power Section .................................................................. 37

5-3. Printed Wiring Board — Dolby Surround Section — ........ 40

5-4. Schematic Diagram — Dolby Surround Section — ........... 43

5-5. Schematic Diagram — OSD Section — ............................. 47

5-6. Printed Wiring Board — OSD Section —..........................51

5-7. Printed Wiring Board — Power Amp Section — ............... 55

5-8. Schematic Diagram — Power Amp Section —.................. 59

5-9. Printed Wiring Board — Panel Section — ......................... 63

5-10. Schematic Diagram — Panel Section — ......................... 67

5-11. IC Block Diagrams ........................................................... 70

5-12. IC Pin Functions ............................................................... 75

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. 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 v oltage drop across a resistor by means of a V OM or battery-operated A C v oltmeter. 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

6. EXPLODED VIEWS

6-1. Case Section........................................................................ 82

6-2. Front panel Section ............................................................. 83

6-3. OSD Board Section............................................................. 84

6-4. Chassis Section ................................................................... 85

7. ELECTRICAL PARTS LIST ........................................ 86

Notes on chip component replacement

• Never reuse a disconnected chip component.

• Notice that the minus side of a tantalum capacitor may be damaged by heat.

SAFETY-RELATED COMPONENT WARNING !!

COMPONENTS IDENTIFIED BY MARK ! OR DO TTED 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

À LA SÉCURITÉ!! LES COMPOSANTS IDENTIFIÉS P AR UNE MARQUE ! SUR LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE REMPLA CER CES COMPOSANTS QUE PAR DES PIÈCES SONY DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.

0.15

Ω

1.5k

Earth Ground

AC voltmeter (0.75V)

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

MODEL IDENTIFICATION — BACK PANEL —

Parts No.

4-989-884-6 4-989-884-0 4-989-884-1 4-989-884-2 4-989-884-3 4-989-884-4

D760Z : US model DE815G : US model DE815G : Canadian model DE815G : E, PX model DE815G : Singapore, Malaysia model DE815G : Australian model

Model

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SECTION 1

SERVICING NOTE

ALL CLEAR

Mode which erases all the user memories registered in this unit and sets to setting at shipment.

Procedure:

1. With the power turned OFF, press the POWER button while pressing the MODE button, AUDIO FUNCTION > and VIDEO FUNCTION > button simultaneously to turn ON the power.

2. ALL CLEAR ! will be displayed on the fluorescent indicator tube, and ALL CLEAR will be executed.

FACTORY SET

Mode which sets the memory of the unit to the setting of adjustment and check at factory. (Not used for servicing.)

Procedure:

1. With the power turned OFF, press the POWER button while pressing the MODE button and AUDIO FUNCTION > button simultaneously to turn ON the power.

2. FACTORY SET will be displayed on the fluorescent indicator tube, and FACTORY SET will be executed.

Note: In case you return the unit to the customer, do not perform FACTRY SET. If you do it, perform ALL CLEAR.

Fluorescent indicator tube, LED all lit mode

Adjustment of OSD Screen Position

The position of the screen can be adjusted freely to correct the deviation of the OSD screen caused by the monitor type that users are using.

1. Move the cursor of the remote commander supplied as an accessory, and display the OSD screen.

2. Click the SET UP of the OSD screen.

3. Next click TV SET.

4. Next click GRAPHIC POSITION SET.

5. The screen for adjusting the OSD screen position will be displayed. Adjust the position with the remote commander supplied as an accessory.

6. Click EXIT to end.

AM Tuning Step 9 kHz/10 kHz Selection

Method:

1. Tur n ON the power, set the AUDIO FUNCTION to AM, and turn OFF the power.

2. While pressing the TUNING + button or PRESET TUNING + button, press the POWER button.

3. “AM 9K STEP” or “AM 10k STEP” will be displayed on the FL display tube.

Key Check Mode

Procedure:

1. With the power turned OFF, press the POWER button while pressing the MODE button and VIDEO FUNCTION > b utton simultaneously to turn ON the power.

2. The fluorescent display tubes and LEDs will all light up. Release the buttons in the order of VIDEO FUNCTION > , and MODE .

3. The Fluorescent indicator tube display changes as follows by pressing the A UDIO FUNCTION < , AUDIO FUNCTION > . (Pressing the other buttons will exit this mode.)

Fluorescent indicator tubes, LEDs are all lit

ENHANCED PRO LOGIC MONO MOVIE MUSIC 12 SPORTS GAME STEREO MONO

SML THEATER SML HALL ACOUSTIC KARAOKE ARENA STADIUM HIGH MEMORY

• Press AUDIO FUNCTION < button or AUDIO FUNCTION > button.

Partial lighting of fluorescent indicator tube 1, LEDs are OFF *1

• Press AUDIO FUNCTION < button or AUDIO FUNCTION > button.

Partial lighting of fluorescent indicator tube 2, LEDs are OFF *1

Method:

1. With the power OFF, while pressing the MODE button and AUDIO FUNCTION < b utton together, press the PO WER button.

2. “KEY TEST [24]” will be displayed on the FL display tube.

3. The [XX] number is counted down each time a button other than POWER is pressed until it becomes [00]. (Buttons pressed once will not be counted again when pressed another time.)

4. When the number becomes [00], press the POWER button and exit the mode.

• Press AUDIO FUNCTION < button or AUDIO FUNCTION > button.

Fluorescent indicator tube and all LEDs are OFF

*1 Those other than the POWER LED go OFF.

4. T o exit the mode, press the PO WER button to turn OFF the power .

• Press AUDIO FUNCTION < button or AUDIO FUNCTION > button.

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