CPD-4401
SAFETY CHECK-OUT
After correcting the original service problem, performLEAKAGE TEST
the following safety checks before releasing the set toThe AC eakage from any exposed metlal part to earth ground
the customer:and from all exposed metal parts to any exposed metal part
having a return to chassis, must not exceed 0.5 mA (500
1. Check the area of your repair for unsoldered or poorly-
soldered connections. Check the entire board surfacemicroampere). Leakage current can be measured by any one
for solder splashes and bridges.of three methods.
2. Check the interboard wiring to ensure that no wires1. A commercial leakage tester, such as the Simpson 229
are ?pinched? or contact high-wattage resistors.or RCA WT-540A. Follow the manufacturers' instructions
to use these instructions.
3. Check that all control knobs, shields, covers, ground
straps, and mounting hardware have been replaced.2. A battery-operated AC milliammeter. The Data Precision
Be absolutely certain that you have replaced all the245 digital multimeter is suitable for this job.
insulators.
3. Measuring the voltage drop across a resistor by means
4. Look for unauthorized replacement parts, particularlyof a VOM or battery-operated AC voltmeter. The "limit"
transistors, that were installed during a previousindication is 0.75 Valog meters , so anmust have an
repair. Point them out to the customer andaccurate low voltage scale. The Simpson's 250 and
recommend their replacement.Sanwa SH-63TRD are examples of passive VOMs that
5. Look for parts which, though functioning, showare suitable. Nearly all battery operateddigital
multimeters that have a range are suitable. (See2V AC
obvious signs of deterioration. Point them out to the
customer and recommend their replacement.Figure A)
6. Check the line cords for cracks and abrasion.
To Exposed Metal
Parts on SetRecommend the replacement of any such line cord
to the customer.
7. Check the B+ and HV to see if they are specified
values. Make sure your instruments are accurate; be
suspicious of your HV meter if sets always have low
HV.AC
0.15 ?F1.5 kWVoltmeter
8. Check the antenna terminals, metal trim, ?metallized"(0.75 V)
knobs, screws, and all other exposed metal parts for
AC Leakage. Check leakage as follows.
Earth Ground
Figure A
WARNING!!AVERTISSEMENT!!
NEVER TURN ON THE POWER IN A CONDITION IN WHICH THE
NE JAMAIS METTRE SOUS TENSION QUAND LA BOBINE DE
DEGAUSS COIL HAS BEEN REMOVED.
DEMAGNETISATION EST ENLEVEE.
SAFETY-RELATED COMPONENT WARNING!!ATTENTION AUX COMPOSANTS RELATIFS A LA SECURITE!!
COMPONENTS IDENTIFIED BY SHADING AND MARK ON THE
SCHEMATIC DIAGRAMS, EXPLODED VIEWS AND IN THE PARTSLES COMPOSANTS IDENTIFIES PAR UNE TRAME ET PAR UNE
MARQUE SUR LES SCHEMAS DE PRINCIPE, LES VUES
LIST ARE CRITICAL FOR SAFE OPERATION. REPLACE THESE
EXPLOSEES ET LES LISTES DE PIECES SONT D'UNE IMPORTANCE
COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS APPEAR
CRITIQUE POUR LA SECURITE DU FONCTIONNEMENT. NE LES
AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUBLISHED BY
REMPLACER QUE PAR DES COMPOSANTS SONY DONT LE
SONY. CIRCUIT ADJUSTMENTS THAT ARE CRITICAL FOR SAFE
OPERATION ARE IDENTIFIED IN THIS MANUAL. FOLLOW THESENUMERO DE PIECE EST INDIQUE DANS LE PRESENT MANUEL OU
PROCEDURES WHENEVER CRITICAL COMPONENTS ARE REPLACEDDANS DES SUPPLEMENTS PUBLIES PAR SONY. LES REGLAGES
DE CIRCUIT DONT L'IMPORTANCE EST CRITIQUE POUR LA
OR IMPROPER OPERATION IS SUSPECTED.
SECURITE DU FONCTIONNEMENT SONT IDENTIFIES DANS LE
PRESENT MANUEL. SUIVRE CES PROCEDURES LORS DE CHAQUE
REMPLACEMENT DE COMPOSANTS CRITIQUES, OU LORSQU'UN
MAUVAIS FONTIONNEMENT SUSPECTE.
? 3 ? |
ACEC
