3
STR-DE1075
Fig. A.
Using an AC voltmeter to check AC leakage.
1.5 k
Ω
0.15
µ
F
AC
voltmeter
(0.75 V)
To Exposed Metal
Parts on Set
Earth Ground
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
DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.
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 PUB-
LISHED BY SONY.
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
SAFETY CHECK-OUT
After correcting the original service problem, perform the follow-
ing 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 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 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 pas-
sive VOM that is suitable. Nearly all battery operated digital
multimeters that have a 2 V AC range are suitable. (See Fig. A)
TABLE OF CONTENTS
1.
SERVICING NOTES
...............................................
4
2.
GENERAL
...................................................................
5
3.
DISASSEMBLY
3-1. Disassembly Flow ...........................................................
6
3-2. Case .................................................................................
7
3-3. S-VIDEO board, VIDEO Board, Tuner .........................
7
3-4. VIDEO AU Board ...........................................................
8
3-5. DIGITAL Board ..............................................................
8
3-6. MAIN Board ...................................................................
9
4.
TEST MODE
.............................................................. 10
5.
DIAGRAMS
5-1. Block Diagram – TUNER/VIDEO INPUT Section – ... 11
5-2. Block Diagram – AUDIO DSP Section – ...................... 12
5-3. Block Diagram – AUDIO CONTROL Section – .......... 13
5-4. Block Diagram – POWER AMP Section – ................... 14
5-5. Block Diagram
– DISPLAY/KEY CONTROL Section – ........................ 15
5-6. Block Diagram – POWER SUPPLY Section – ............. 16
5-7. Note for Printed Wiring Boards
and Schematic Diagrams ................................................ 17
5-8. Schematic Diagram – DIGITAL Board (1/5) – ............. 19
5-9. Schematic Diagram – DIGITAL Board (2/5) – ............. 20
5-10. Schematic Diagram – DIGITAL Board (3/5) – ............. 21
5-11. Schematic Diagram – DIGITAL Board (4/5) – ............. 22
5-12. Schematic Diagram – DIGITAL Board (5/5) – ............. 23
5-13. Printed Wiring Board
– DIGITAL Board (Component Side) – ......................... 24
5-14. Printed Wiring Board
– DIGITAL Board (Conductor Side) – ........................... 25
5-15. Printed Wiring Board – VIDEO Board – ....................... 26
5-16. Schematic Diagram – VIDEO Board – ......................... 27
5-17. Printed Wiring Boards
– S-VIDEO/VIDEO AU Boards – .................................. 28
5-18. Schematic Diagram
– S-VIDEO/VIDEO AU Boards – .................................. 29
5-19. Printed Wiring Board – MAIN Board – ........................ 30
5-20. Schematic Diagram – MAIN Board (1/3) – .................. 31
5-21. Schematic Diagram – MAIN Board (2/3) – .................. 32
5-22. Schematic Diagram – MAIN Board (3/3) – .................. 33
5-23. Printed Wiring Board – BIAS Board – .......................... 34
5-24. Schematic Diagram – BIAS Board – ............................. 35
5-25. Printed Wiring Board – DISP Board – .......................... 36
5-26. Schematic Diagram – DISP Board – ............................. 37
5-27. Printed Wiring Boards
– H.P/JOG/POWER/SP/VIDEO 3/VOL Boards – ......... 38
5-28. Schematic Diagram
– H.P/JOG/POWER/SP/VIDEO 3/VOL Boards – ......... 39
5-29. Printed Wiring Boards
– POWER SUPPLY Section – ........................................ 40
5-30. Schematic Diagram – POWER SUPPLY Section – ...... 41
5-31. IC Pin Function Description ........................................... 47
6.
EXPLODED VIEWS
6-1. Case Section .................................................................... 59
6-2. Front Panel Section ......................................................... 60
6-3. Chassis Section-1 ............................................................ 61
6-4. Chassis Section-2 ............................................................ 62
7.
ELECTRICAL PARTS LIST
............................... 63
Ver 1.1 2001.7
