Sony DXA-H2750 Service Manual page 2

DXA-H2750 |
SAFETY CHECK-OUT
After correcting the original service problem,
perform the following safety check before releasing
the set to the customer:
Check theantenna 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 ail exposed metal parts to any
exposed metal part having a return to chassis, must
not exceed 0.5mA (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 instru-
ments.
Ne
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 volt-
meter. The "limit" indication is 0.75V, so
analog meters must have an accurate low-
voltage scale. The Simpson 250 and Sanwa
SH-63Trd are examples of a passive VOM that
is suitable. Nearly all battery operated digital
multimeters that have a 2V AC range are
suitable. (See Fig. A)
To Exposed Metal
Parts on Set
AC
0.15 nF voltmeter
jo 3) (0.75 V)
= Earth Ground
Fig. A. Using an AC voltmeter to check AC leakage.
MODEL IDENTIFICATION
— Model Number Label —
SONY movetno. pxa-H2750
STEREO CASSETTE DECK AMPLIFIER
WML
US model: AC: 120V 60Hz 105W
CND model: AC: 120V 60Hz 115W
AEP model: AC: 220-—230V~50/60Hz
UK model: AC: 240V~50Hz
E, EA, TR model: AC: 120/220/230~-240V~50/60Hz 110W
G, 1T model: AC: 220—230V~50Hz
AUS model: AC: 240V~50Hz 110W
@CND: Canadian model
e@ AUS: Australian model
eG: Germany model
elT: italian model
@EA: Saudi Arabia model
e@TR: Tourist model
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK A OR DOTTED
LINE WITH MARK A 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
A LA SECURITE!
LES COMPOSANTS IDENTIFIES PAR UNE MARQUE /(\
SUR LES DIAGRAMMES SCHEMATIQUES ET LA LISTE
DES PIECES SONT CRITIQUES POUR LA SECURITE
DE FONCTIONNEMENT. NE REMPLACER CES CCM-
POSANTS QUE PAR DES PIECES SONY DONT LES
NUMEROS SONT DONNES DANS CE MANUEL 9U
DANS LES SUPPLEMENTS PUBLIES PAR SONY.