DVP-NS15/NS51P/NS43P/NS53P/K56P
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-solderedLEAKAGE TEST
connections. Check the entire board surface for solder splashesThe AC leakage from any exposed metal part to earth ground and from
and bridges.all exposed metal parts to any exposed metal part having a return to
2. Check the interboard wiring to ensure that no wires are ?pinched?chassis, must not exceed 0.5mA (500 microampers). Leakage current
can be measured by any one of three methods.
or contact high-wattage resistors.
3. Look for unauthorized replacement parts, particularly transistors,1. A commercial leakage tester, such as the Simpson 229 or RCA
that were installed during a previous repair. Point them out to the
customer and recommend their replacement.TW-540A. Follow the manufacturers? instructions to use these
instruments.
4. Look for parts which, though functioning, show obvious signs of
2. A battery-operated AC milliammeter. The Data Precision 245 digital
deterioration. Point them out to the customer and recommend theirmultimeter is suitable for this job.
replacement.
3. Measuring the voltage drop across a resistor by means of a VOM
5. Check the line cord for cracks and abrasion.or battery-operated AC volmeter. The ?limit? indication is 0.75V,
Recommend the replacement of any such line cord to the
customer.so analog meters must have an accurate low voltage scale. The
Simpson 250 and Sanwa SH-63Trd are examples of a passive
6. Check the B+ voltage to see it is at the values specified.VOM that is suitable. Nearly all battery operated digital multimeters
7. Check the antenna terminals, metal trim, ?metallized? knobs,that have a 2V AC range are suitable. (See Fig. A)
screws, and all other exposed metal parts for AC leakage. CheckUnleaded solder
leakage as described below.Boards requiring use of unleaded solder are printed with the lead-free
mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with the
To Exposed Metallead free mark due to their particular size.)
Parts on Set
: LEAD FREE MARK
Unleaded solder has the following characteristics.
Unleaded solder melts at a temperature about 40°C highter than
ordinary solder.AC
0.15 F 1.5k Voltmeter
(0.75 V)Ordinary soldering irons can be used but the iron tip has to be
applied to the solder joint for a slightly longer time.
Soldering irons using a temperature regulator should be set to about
350°C
Caution: The printed pattern (copper foil) may peel away if the
heated tip is applied for too long, so be careful!Earth Ground
Strong viscosityFig.A. Using an Acvoltmeter to check AC leakage.
Unleaded solder is more viscous (sticky, less prone to flow) than
ordinary solder so use caution not to let solder bridges occur such
as on IC pins, etc.
WARNING!! Usable with ordinary solder
WHEN SERVICING, DO NOT APPROACH THE LASER EXIT WITHIt is best to use only unleaded solder but unleaded solder may also
THE EYE TOO CLOSELY. IN CASE IT IS NECESSARY TObe added to ordinary solder.
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.
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
exposure.
SAFETY-RELATED COMPONENT WARNING!!ATTENTION AU COMPOSANT AYANT RAPPORT
COMPONENTS IDENTIFIED BY MARK OR DOTTED LINEA LA S�CURIT�!
WITH MARK ON THE SCHEMATIC DIAGRAMS AND IN THELES COMPOSANTS IDENTIF�S PAR UNE MARQUE SUR LES
PARTS LIST ARE CRITICAL TO SAFE OPERATION. REPLACEDIAGRAMMES SCH�MATIQUES ET LA LISTE DES PIECES SONT
THESE COMPONENTS WITH SONY PARTS WHOSE PARTCRITIQUES POUR LA S�CURIT� DE FONCTIONNEMENT. NE
NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR INREMPLACER CES COMPOSANTS QUE PAR DES PIESES SONY
SUPPLEMENTS PUBLISHED BY SONY.DONT LES NUM�ROS SONT DONN�S DANS CE MANUEL OU
DANS LES SUPP�MENTS PUBLI�S PAR SONY.
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ACEC
