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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.
This appliance is classified as a
CLASS 1 LASER product.
The CLASS 1 LASER PROD-
UCT MARKING is located on the
rear exterior.
CAUTION
Use of controls or adjustments or performance of
procedures other than those specified herein may
result in hazardous radiation exposure.
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.
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.
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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.). Leak-
age 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 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)
1.5 k W 0.15 µF AC
voltmeter
(0.75 V) To Exposed Metal
Parts on Set
Earth Ground
Fig. A. Using an AC voltmeter to check AC leakage.
TABLE OF CONTENTS
1. SERVICING NOTES
................................................... 4
2. GENERAL ..................................................................... 5
3. DISASSEMBLY ............................................................ 13
4. TEST MODE ................................................................. 15
5. ELECTRICAL ADJUSTMENTS ............................ 16
6. DIAGRAMS
6-1. Block Diagram ................................................................... 19
6-2. Printed Wiring Boards Ð CD Section Ð .............................. 23
6-3. Schematic Diagram Ð CD Section Ð .................................. 25
6-4. Printed Wiring Boards Ð Main Section Ð ........................... 28
6-5. Schematic Diagram Ð Main Section Ð ............................... 31
6-6. Schematic Diagram Ð Panel Section Ð ............................... 36
6-7. Printed Wiring Boards Ð Panel Section Ð .......................... 41
6-8. IC Pin Function Description .............................................. 46
7. EXPLODED VIEWS ................................................... 49
8. ELECTRICAL PARTS LIST .................................... 54
