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ATTENTION AU COMPOSANT AYANT RAPPORT
Ë LA SƒCURITƒ!
LES COMPOSANTS IDENTIFIƒS PAR UNE MARQUE !
SUR LES DIAGRAMMES SCHƒMATIQUES ET LA LISTE
DES PIéCES SONT CRITIQUES POUR LA SƒCURITƒ
DE FONCTIONNEMENT. NE REMPLACER CES COM-
POSANTS QUE PAR DES PIéCES SONY DONT LES
NUMƒROS SONT DONNƒS DANS CE MANUEL OU
DANS LES SUPPLƒMENTS PUBLIƒS PAR SONY. SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK ! OR DOTTED
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 PUB-
LISHED BY SONY.
TABLE OF CONTENTS
1. SERVICING NOTES
............................................... 3
2. GENERAL ................................................................... 7
3. DISASSEMBLY ......................................................... 9
4. TEST MODE .............................................................. 12
5. ELECTRICAL ADJUSTMENTS ......................... 15
6. DIAGRAMS
6-1. Block Diagram Ð SERVO Section Ð .............................. 21
6-2. Block Diagram Ð MAIN Section (1/2) Ð ....................... 23
6-3. Block Diagram Ð MAIN Section (2/2) Ð ....................... 25
6-4. Block Diagram
Ð DISPLAY/KEY/POWER SUPPLY Section Ð ............. 27
6-5. Notes for Printed Wiring Board
and Schematic Diagram .................................................. 30
6-6. Printed Wiring Board Ð BD Board (SIDE A) Ð ............. 31
6-7. Printed Wiring Board Ð BD Board (SIDE B) Ð ............. 33
6-8. Schematic Diagram Ð BD Section (1/2) Ð ..................... 35
6-9. Schematic Diagram Ð BD Section (2/2)Ð ...................... 37
6-10. Printed Wiring Boards
Ð DETECTION SW Board, MOTOR Board Ð ............... 39
6-11. Schematic Diagram
Ð DETECTION SW/MOTOR Section Ð ........................ 41
6-12. Printed Wiring Board Ð DIGITAL Board (SIDE A) Ð ... 43
6-13. Printed Wiring Board Ð DIGITAL Board (SIDE B) Ð ... 45
6-14. Schematic Diagram Ð DIGITAL Section (1/4) Ð .......... 47
6-15. Schematic Diagram Ð DIGITAL Section (2/4) Ð .......... 49
6-16. Schematic Diagram Ð DIGITAL Section (3/4) Ð .......... 51
6-17. Schematic Diagram Ð DIGITAL Section (4/4) Ð .......... 53
6-18. Printed Wiring Board Ð PANEL Section (1) Ð .............. 56
6-19. Schematic Diagram Ð PANEL Section (1) Ð ................. 57
6-20. Printed Wiring Boards Ð PANEL Section (2) Ð ............. 59
6-21. Schematic Diagram Ð PANEL Section (2) Ð ................. 61
6-22. Printed Wiring Boards Ð POWER Section Ð ................. 63
6-23. Schematic Diagram Ð POWER Section Ð ..................... 65
6-24. IC Pin Function Description ........................................... 77
7. EXPLODED VIEWS ................................................ 88
8. ELECTRICAL PARTS LIST ............................... 93
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SECTION 1
SERVICING NOTES
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, ÒmetallizedÓ 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 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 manufacturersÕ 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 ÒlimitÓ indica-
tion is 0.75 V, so analog meters must have an accurate low-
voltage scale. The Simpson 250 and Sanwa SH-63Trd are ex-
amples of a passive VOM that is suitable. Nearly all battery
operated digital multimeters that have a 2 V AC range are suit-
able. (See Fig. A)
Fig. A. Using an AC voltmeter to check AC leakage.
1.5 k W 0.15 µF AC
voltmeter
(0.75 V) To Exposed Metal
Parts on Set
Earth Ground
MODEL IDENTIFICATION
Ñ LOWER SIDE CABINET (BOTTOM VIEW) Ñ
Part No. Front Side
4-210-100-1
¹: AEP and UK models
4-210-100-2 ¹: US and
Canadian models
ADVARSEL
Eksplosjonsfare ved feilaktig skifte av batteri.
Benytt samme batteritype eller en tilsvarende type
anbefalt av apparatfabrikanten.
Brukte batterier kasseres i henhold til fabrikantens
instruksjoner.
VARNING
Explosionsfara vid felaktigt batteribyte.
AnvŠnd samma batterityp eller en likvŠrdig typ som
rekommenderas av apparattillverkaren.
Kassera anvŠnt batteri enligt gŠllande fšreskrifter.
VAROITUS
Paristo voi rŠjŠhtŠŠ, jos se on virheellisesti asennettu.
Vaihda paristo ainoastaan laitevalmistajan suosittelemaan tyyppiin.
HŠvitŠ kŠytetty paristo valmistajan ohjeiden mukaisesti.ADVARSEL!
Lithiumbatteri-Eksplosionsfare ved fejlagtig hŒndtering.
Udskiftning mΠkun ske med batteri
af samme fabrikat og type.
LevŽr det brugte batteri tilbage til leverand¿ren.
CAUTION
Danger of explosion if battery is incorrectly replaced.
Replace only with the same or equivalent type recommended by
the manufacturer.
Discard used batteries according to the manufacturerÕs instruc-
tions.
The laser diode in the optical pick-up block may suffer electro-
static break-down because of the potential difference generated
by the charged electrostatic load, etc. on clothing and the human
body.
During repair, pay attention to electrostatic break-down and also
use the procedure in the printed matter which is included in the
repair parts.
The flexible board is easily damaged and should be handled with
care.
NOTES ON LASER DIODE EMISSION CHECK
The laser beam on this model is concentrated so as to be focused
on the disc reflective surface by the objective lens in the optical
pick-up block. Therefore, when checking the laser diode emis-
sion, observe from more than 30 cm away from the objective lens.NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT
