Sony STR-GX80ES Service Manual

TABLE OF CONTENTS
section Title Page
1. GENERAL
1-1. Parts Identification airecleseileirenevielie’ iwc6:10 “ela; eheocer8 elibo anise: wrens 4
2. ELECTRICAL ADJUSTMENTS -:---------errereeeres 5
3. DIAGRAMS
3-1. Frame Schematic Diagram::-:+++:++sesee ees 7
3-2. Circuit Boards Location ::+:++++rssteereeee 9
3~3. Block Diagram -:++++s+ere eee terete tee enes 10
3-4. IC Block Diagrams::++++ereetereete rere ees 12
3-5. Front-End Schematic Diagram ::::+++++++:: 13
3-6. Semiconductor Lead Layouts::+++-+:+++++:: 14
3-7. Printed Wiring Board
— Tuner Display “Muting Section — ----::: 17
3-8. Schematic Diagram .
= Tuner Section ani a We eseifer econ :e Wee 8. aceraene ceke.es eer saree 19
3-9. Printed Wiring Board
— Tuner Display “Muting Section — ---:::: 21
3-10. Schematic Diagram
~— Display /Muting Section — «+:+rrrrteeeees 23
3-11. Printed Wiring Board
— Tone/Volume/S.Direct/VR LED Section —
ce We deca’ Gite hb ws 6./e fee Ae cere Wie c8 6,“ala ce o8ifes ees. eye Were see Oey oes eral oleae 23
3-12. Schematic Diagram
— Tone/Volume/S.Direct/VR LED Section —
25
eae mmm nr errr ener eee reese eres eeaeresrese reserves
4.
5.
Section Title Page
3-13. Printed Wiring Board
—S Video/Video Section — «+++ stteeeeees 27
3-14. Schematic Diagram
—S Video/Video Section — -s+rrr ttre eeees 29
3-15. Printed Wiring Board
—A Class Section — «cette eter eee e etter eens 31
3-16. Schematic Diagram
—-A Class Section — BC baile: Wicereneriee aoe a: eCenete: oF 6 le sec 33
3-17. Printed Wiring Board
— Power “4-8 SW Section — srrrrrsrscreees 35
3-18. Schematic Diagram
— Power/4-8 SW Section — srrrrrrreseeess 37
3-19. Printed Wiring Board
—Input/REC Out Section — -srrrr rte seees 39
3-20. Schematic Diagram
—Input/REC Out Section — --++serreeres ss Al
EXPLODED VIEWS
4- 1. Cabinet Section SO a ee ee ee ee ee ee 44
4-2. Front Panel Section 026,008. bne. 8 \ 08. 08a O08 Wye ales 45
4-3. Back Panel Section ::::+:+++* S eeacewe anisole 4G
4-4, Chassis Section Cm ere c rene rere sever eeeveneans AT
ELECTRICAL PARTS LIST: -:ececec ere r tree renee 48
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
ea
The AC leakage from any exposed metal part to
rth ground and from all exposed metal parts to any
exposed metal part having a return to chassis, must
not exceed 0.5mA (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 instru-
ments.
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 volt-
meter. 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
(0.75 V)
= Earth Ground
Using an AC voltmeter to check AC leakage.

Sony STR-GX80ES Specifications

General

Brand	Sony
Model	STR-GX80ES
Category	Stereo Receiver
Language	English