Sony STR-DE495 Service Manual page 3

Fm stereo/fm-am receiver
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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, "metallized" 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 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 means of a
VOM or battery-operated AC voltmeter. The "limit" 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)
To Exposed Metal
Parts on Set
TE
L 13942296513
0.15 µF
www
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE
WITH MARK 0 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 PUBLISHED BY SONY.
http://www.xiaoyu163.com
AC
1.5 kΩ
voltmeter
(0.75 V)
Earth Ground
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http://www.xiaoyu163.com
2 9
8
MODEL IDENTIFICATION
— BACK PANEL —
MODEL
DE595: Korean
DE595: Taiwan
DE595: Argentine
DE595: US
DE595: Canadian
DE595: Australian
DE595: Singapore, Malaysia
DE595: E2
DE595: Mexican
DE595: AEP
DE595: UK
DE495: AEP
DE595: UK
Q Q
DE495: Singapore, Malaysia
3
6 7
1 3
1 5
DE495: Taiwan
DE495: Korean
DE495: Australian
ATTENTION AU COMPOSANT AYANT RAPPORT
co
LES COMPOSANTS IDENTIFIÉS PAR UNE MARQUE 0 SUR 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.
STR-DE495/DE595
9 4
2 8
Part No.
PART No.
4-244-149-0s
4-244-149-1s
4-244-149-4s
4-246-023-0s
4-246-023-1s
4-246-023-2s
4-246-023-3s
4-246-023-4s
4-246-023-5s
4-246-023-6s
4-246-023-7s
4-246-034-1s
4-246-034-2s
4-246-034-3s
0 5
8
2 9
9 4
2 8
4-246-034-4s
4-246-034-5s
4-246-034-7s
m
À LA SÉCURITÉ!!
Ver 1.1
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