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TABLE OF CONTENTS
1. SERVICING NOTES
............................................... 3
2. GENERAL ................................................................... 6
3. DISASSEMBLY ......................................................... 7
4. TEST MODE .............................................................. 10
5. MECHANICAL ADJUSTMENTS ....................... 13
6. ELECTRICAL ADJUSTMENTS ......................... 19
7. DIAGRAMS ................................................................. 22
7-1. Note for Printed Wiring Boards and Schematic Diagrams ....................................................... 23
7-2. Printed Wiring Board Ð BD Section Ð ........................... 25
7-3. Schematic Diagram Ð BD Section Ð ............................... 27
7-4. Printed Wiring Board Ð Main Section Ð ........................ 29
7-5. Schematic Diagram Ð Main Section Ð ........................... 31
7-6. Printed Wiring Boards Ð Jack Section Ð ........................ 33
7-7. Schematic Diagram Ð Jack Section Ð ............................ 35
7-8. Printed Wiring Boards Ð Panel Section Ð ...................... 37
7-9. Schematic Diagram Ð Panel Section Ð .......................... 39
7-10. Printed Wiring Board Ð Sensor/Motor Section Ð .......... 41
7-11. Schematic Diagram Ð Sensor/Motor Section Ð ............. 43
7-12. IC Pin Function Description ........................................... 47
8. EXPLODED VIEWS ................................................ 49
9. ELECTRICAL PARTS LIST ............................... 56
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous
radiation exposure.
The laser component in this product
is capable of emitting radiation
exceeding the limit for Class 1.
This appliance is classified as
a CLASS 1 LASER product.
The CLASS 1 LASER
PRODUCT MARKING is
located on the rear exterior.
4-998-525-0
4-998-525-1
4-998-525-2
4-998-525-4
4-998-525-5
4-998-525-6
US model
Canadian model
AEP, AED UK model
Singapore model
E model
Australian model
PART No. MODEL
MODEL IDENTIFICATION
Ñ BACK PANEL Ñ
¥ Abbreviation
AED: North European
CAUTION INVISIBLE LASER RADIATION WHEN OPEN AND
INTERLOCKS DEFEATED. AVOID EXPOSURE TO BEAM.
ADVARSEL USYNLIG LASERSTRÅLING VED ÅBNING NÅR
SIKKERHEDSAFBRYDERE ER UDE AF FUNKTION. UNDGÅ UDSAETTELSE
FOR STRÅLING.
VORSICHT UNSICHTBARE LASERSTRAHLUNG, WENN
ABDECKUNG GEÖFFNET UND SICHEREITSVERRIEGELUNG
ÜBERBRÜCKT. NICHT DEM STRAHL AUSSETZEN.
VA R O ! AVATTAESSA JA SUOJALUKITUS OHITETTAESSA OLET ALT
TIINA NÄKYMÄTTÖMÄLLE LASERSÄTEILYLLE. ÄLÄ KATSO SÄTEESEEN.
VARNING OSYNLING LASERSTRÅLING NÄR DENNA DEL ÄR ÖPPNAD
OCH SPÄRREN ÄR URKOPPLAD. BETRAKTA EJ STRÅLEN.
ADVERSEL USYNLIG LASERSTRÅLING NÅR DEKSEL ÅPNES OG
SIKKERHEDSLÅS BRYTES. UNNGÅ EKSPONERING FOR STRÅLEN.
VIGYAZAT !A BURKOLAT NYITÁSAKOR LÁTHATATLAN LÉZERSU
GÁRVESZÉLY KERÜLJE A BESUGÁRZÁST
(Except for the customers in the United States and
Canada)
The following caution label is located inside the unit.
PART No.
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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.
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
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
SECTION 1
SERVICING NOTES
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.
LASER DIODE AND FOCUS SEARCH OPERATION
CHECK
Carry out the ÒS curve checkÓ in ÓCD section adjustmentÓ and
check that the S curve waveform is output repeatedly.NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT
