Sony dvpcx 860 service manual

Page 2

SAFETY CHECK-OUT

After correcting the original service problem, perform the following

safety checks before releasing the set to the customer.

1. Check the area of your repair for unsoldered or poorlyAsoldered
connections. Check the entire board surface for solder splashes
and bridges.

2. Check the interboard wiring to ensure that no wires are
"pinched" or contact highAwattage resistors.

3. Look for unauthorized replacement parts, particularly
transistors, that were installed during a previous repair. Point
them out to the customer and recommend their replacement.

4. Look for parts which, though functioning, show obvious signs
of deterioration. Point them out to the customer and
recommend their replacement.

5. Check the line cord for cracks and abrasion.

Recommend the replacement of any such line cord to the

customer.

Check the B+ voltage to see it is at the values specified.

7. Check the antenna terminals, metal trim, "metallized" knobs,
screws, and all other exposed metal parts for AC leakage.
Check leakage as described below.

53

To Exposed Metal
Parts on Set
AC
0.15 F = E Voltmeter
Ii 1.5 kg (0. 75 W
E Ea/Th Ground

Fig. A. Using an AC voltmeter to cheek AC leakage.

WARNINGI!

WHEN SERVICING, DO NOT APPROACHTHE LASER EXITWITH
THE EYE TOO CLOSELY. IN CASE IT IS NECESSARY TO
CONFIRM LASER BEAM EMISSION, BE SURE TO OBSERVE
FROM A DISTANCE OF MORETHAN 25 cm FROM THE SURFACE
OFTHE OBJECTIVE LENS ON THE OPTICAL PICK-UP BLOCK.

CAUTION:
The use of optical instrument with this product will increase eye
hazard.

CAUTION

Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous radiation
CXPOSUYC.

SAFETY-RELATED COMPONENT WARNING !!

COMPONENTS IDENTIFIED BY MARK A OR DOTTED LINEWITH
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

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 0.5mA (500 nticroampers).
Leakage cunent can be measured by any one of three methods.

1. A commercial leakage tester, such as the Simpson 229 or RCA
TWA540A. 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" indication
is 0.75V, so analog meters must have an accurate low voltage
scale. The Simpson 250 and Sanwa SHA63Trd are examples
ofa passive VOM that is suitable. Nearly all battery operated
digital multimeters that have a 2V AC range are suitable. (See
Fig. A)

CLASS] LASER PRODUCT
LASER KLASSE 1
LUOKAN 1 LASERLAiTE

KLASS r LASERAPPARAT

ATTENTION AU COMPOSANT AYANT RAPPORT
A LA SECURITE!

LES COMPOSANTS IDENTIFES PAR UNE MARQUE A SUR LES
DIAGRAMMES SCHEMATIQUES ET LA LISTE DES PIECES SONT
CRITIQUES POUR LA SECURITE DE FONCTIONNEMENT. NE
REMPLACER CES COMPOSANTS QUE PAR DES PIESES SONY
DONT LES NUMERos SONT DONNES DANS CE MANUEL ou
DANS LES SUPPEMENTS PUBLIEs PAR SONY.

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PUBLISHED BY SONY.