Sony str d 915 service manual

Page 2

TABLE OF CONTENTS

519115111 ILUE 939$
1. SERVICING NOTE ............................................... 3
2. GENERAL .............................................................. 4
3. DIAGRAMS

3-1. Circuit Boards Location
3-2. Semiconductor Lead Layouts.
343. Printed Wiring Boards - SURROUND Section -
3-4. Schematic Diagram - SURROUND Section -
3»5. Schematic Diagram - MAIN Section - .......
3»6. Printed Wiring Boards - MAIN Section -
3-7. Printed Wiring Boards - DISPLAY Section
3-8. Schematic Diagram - DISPLAY Section -.
3-9. IC Pin Functions

- |C106 (TC9174P) LED Driver ..........................

' I0202 ((uPD7551BGF-195«3B9) Main Controller...

4. EXPLODED VIEWS
4-1. Cabinet Section .
4-2. Chassis Section.

5. ELECTRICAL PARTS LIST ................................... 39

MODEL IDENTIFICATION
- Specification Label - STR-D915

SONY® MODEL No. m

FM STEREO FM-AM RECEIVER

STR- D7 1 5

us model :120v Ac, 60H: 195w (D715)
120V AC, 60Hz 21 OW (0915)

Canadian model : 120V AC, 60Hz 28OVA (D715)
120V AC, 60Hz 305VA (D915)

Australian model :240V AC, 50Hz 220W

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 microampers). Leakage current
can be measured by any one of three methods.

. Avcommercial leakage tester, such as the Simpson 229

or RCA WT-54OA. 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.

. 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)

To Exposed Metal
Parts on Set

AC
/ voltmeter
(0.75V)

0.15M: E15)
'._|

1? Earth Ground

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

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 II

COMPONENTS IDENTIFIED BV MARK A OR DOTTED LINE

WITH MARK A 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
A LA sEcunrrEii

LES COMPOSANTS IDENTIFIES PAR uNE MARQUE A
sun LES DIAGRAMMES SCHEMATIQUES ET LA LISTE
DES PIECES SONT CRITIQUES POUR LA SECURITE DE
FONCTIONNEMENT. NE REMPLACER CES
COMPOSANTS OUE PAR DES PIECES SONY DONT LES
NUMEROS SONT DONNES DANS CE MANUEL ou DANS
LES SUPPLEMENTS PUBLIES PAR SONY.