Sony dvps 745 d 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 poorly»soIA
dered 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 transis-
tors, 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 recom-
mend 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.

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

To Exposed Metal

Paris on Set
AC
0.15uF g 1.5 k!) / voltmeter
(0.75 V)

_ Earth Ground
Fig. A. Using an AC voltmeter to check AC leakage.

WARNINGI!

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

SAFETY-RELATED COMPONENT WARNING !l

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.

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 cha , must not exceed 0.5 mA (500 microamperes).
Leakage current can be measured by any one of three methods.

l. 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 batteryeoperated AC voltmeter. The limit indica-
tion is 0.75V, 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 at 2V AC range are suit-
able. (See Fig.A)

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 ra-
diation exposure.

ATTENTION Au COMPOSANT AYANT RAPPORT
A LA SECURITE!

LES COMPOSANTS iDENTiFiES PAR UNE MAROUE A
SUR LES DIAGRAMMES SCHEMATIOUES ET LA LISTE
DES PIECES SONT CRITIQUES POUR LA SECURITE
DE FONCTIONNEMENT. NE REMPLAcER CES COM-
POSANTS QUE PAR DES PIECES SONY DONT LES
NUMEROS SONT DONNES DANS CE MANUEL OU
DANS LES SUPPLEMENTS PUBLiEs PAR SONY.