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MODEL IDENTIFICATION
- BACK PANEL -
Part No.
MODEL PART No.
STR-DE497P: AEP 4-252-088-0s
STR-DE497P: UK 4-252-088-1s
STR-K4800P: US 4-252-088-2s
STR-K4800P: CND 4-252-088-3s
STR-K5800P: US 4-252-088-6s
- Abbreviation
CND : Canadian model STR-DE497P/K4800P/K5800P
1.5 k 0.15
µF AC
voltmeter
(0.75 V)
To Exposed Metal
Parts on Set
Earth Ground
SAFETY CHECK-OUT
After correcting the original service problem, perf
orm the follow-
ing safety check before releasing the set to the customer:
Check the antenna terminals, metal trim, metallize d 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 g round and
from all exposed metal parts to any exposed metal p art having a
return to chassis, must not exceed 0.5 mA (500 micr oampers.).
Leakage current can be measured by any one of three methods.
1. A commercial leakage tester, such as the Simpson 2 29 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 m eans of a
VOM or battery-operated AC voltmeter. The limit i ndica-
tion is 0.75 V, so analog meters must have an accurate low-
voltage scale. The Simpson 250 and Sanwa SH-63Trd ar e 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.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE
WITH MARK 0ON THE SCHEMATIC DIAGRAMS AND IN
THE PARTS LIST ARE CRITICAL TO SAFE OPERATION.
REPLACE THESE COMPONENTS WITH SONY PARTS WHOS E
PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR
IN SUPPLEMENTS PUBLISHED BY SONY. ATTENTION AU COMPOSANT AYANT RAPPORT
Ã- LA SÉCURITÉ!!
LES COMPOSANTS IDENTIFIÉS PAR UNE MARQUE 0SUR LES
DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES PIÈCES
SONT CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT.
NE REMPLACER CES COMPOSANTS QUE PAR DES PIÈCES
SONY DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL
OU DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.
