3
STR-K880/K900
TABLE OF CONTENTS
1.
GENERAL
...................................................................
4
2.
TEST MODE
............................................................... 12
3.
DIAGRAMS
................................................................. 14
3-1.
Block Diagram – MAIN Section – .................................. 16
3-2.
Block Diagram – DISPLAY/POWER Section – ............. 17
3-3.
Printed Wiring Board – DIGITAL Board (Side A) – ....... 18
3-4.
Printed Wiring Board – DIGITAL Board (Side B) – ....... 19
3-5.
Schematic Diagram – DIGITAL Board (1/5) – ............... 20
3-6.
Schematic Diagram – DIGITAL Board (2/5) – ............... 21
3-7.
Schematic Diagram – DIGITAL Board (3/5) – ............... 22
3-8.
Schematic Diagram – DIGITAL Board (4/5) – ............... 23
3-9.
Schematic Diagram – DIGITAL Board (5/5) – ............... 24
3-10. Printed Wiring Board – MAIN Board – .......................... 25
3-11. Schematic Diagram – MAIN Board (1/3) – .................... 26
3-12. Schematic Diagram – MAIN Board (2/3) – .................... 27
3-13. Schematic Diagram – MAIN Board (3/3) – .................... 28
3-14. Printed Wiring Boards
– DISPLAY Board, POWER Board – ............................. 29
3-15. Schematic Diagrams
– DISPLAY Board, POWER Board – ............................. 30
3-16. Printed Wiring Boards
– STANDBY Board, AC SELECT Board – .................... 31
3-17. Printed Wiring Board – SPEAKER Board – ................... 32
3-18. Schematic Diagram – SPEAKER Board,
STANDBY Board, AC SELECT Board – ....................... 33
3-19. Printed Wiring Board – SPEAKER B Board – ............... 34
3-20. Printed Wiring Boards
– ADCC Board, VIDEO 3 Board – ................................. 35
3-21. Schematic Diagrams – SPEAKER B Board,
ADCC Board, VIDEO 3 Board – .................................... 36
3-22. Printed Wiring Boards
– VIDEO Board, HEADPHONE Board – ....................... 37
3-23. Schematic Diagram
– VIDEO Board, HEADPHONE Board – ....................... 38
3-24. Printed Wiring Board – HDMI Board – .......................... 39
3-25. Schematic Diagram – HDMI Board – ............................. 40
4.
EXPLODED VIEWS
4-1.
Front Panel Section ......................................................... 49
4-2.
Chassis Section-1 ............................................................ 50
4-3.
Chassis Section-2 ............................................................ 51
5.
ELECTRICAL PARTS LIST
.................................. 52
SAFETY CHECK-OUT
After correcting the original service problem, perform the following
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 passive VOM that is suitable. Nearly all battery operated
digital multimeters that have a 2 V AC range are suitable. (See
Fig. A)
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
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.
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.
About area codes
The area code of the receiver you purchased is
shown on the lower right portion of the rear panel
(see the illustration below).
Any differences in operation, according to the area
code, are clearly indicated in the text, for example,
“Models of area code AA only”.
SPEAKERS
FRONT B
L
R
L
R
CENTER
SURROUND BACK
SURROUND
FRONT A
R
R
L
L
+
–
+
–
SPEAKERS
+
–
Area code
Summary of Contents for STR-K880
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