CPD-EG300
SAFETY CHECK-OUT
(US Model only)
After correcting the original service problem, performLEAKAGE TEST
the following safety checks before releasing the set to the The AC leakage from any exposed metal part to earth ground
customer:and from all exposed metal parts to any exposed metal part having
a return to chassis, must not exceed 0.5 mA (500 microampere).
1. Check the area of your repair for unsoldered orLeakage current can be measured by any one of three methods.
poorly-soldered connections. Check the entire board
1. A commercial leakage tester, such as the Simpson 229 or
surface for solder splashes and bridges.
RCA WT-540A. Follow the manufacturers' instructions to
2. Check the interboard wiring to ensure that no wires
use these instructions.
are Opinched� or contact high-wattage resistors.
2. A battery-operated AC milliammeter. The Data Precision
3. Check that all control knobs, shields, covers, ground
245 digital multimeter is suitable for this job.
straps, and mounting hardware have been replaced.
3. Measuring the voltage drop across a resistor by means of
Be absolutely certain that you have replaced all the
a VOM or battery-operated AC voltmeter. The "limit"
insulators.
indication is 0.75 V, so analog meters must have an accurate
4. Look for unauthorized replacement parts,
low voltage scale. The Simpson's 250 and Sanwa
particularly transistors, that were installed during
SH-63Trd are examples of passive VOMs that are suitable.
a previous repair. Point them out to the customer
Nearly all battery operated digital multimeters that have a
and recommend their replacement.
2V AC range are suitable. (See Fig. A)
5. Look for parts which, though functioning, show
obvious signs of deterioration. Point them out to
the customer and recommend their replacement.WARNING!!
6. Check the line cords for cracks and abrasion.
NEVER TURN ON THE POWER IN A CONDITION IN WHICH THE
Recommend the replacement of any such line cord
DEGAUSS COIL HAS BEEN REMOVED.
to the customer.
7. Check the B+ and HV to see if they are specified
SAFETY-RELATED COMPONENT WARNING!!
values. Make sure your instruments are accurate;
be suspicious of your HV meter if sets always haveCOMPONENTS IDENTIFIED BY SHADING AND MARK � ON
low HV.THE SCHEMATIC DIAGRAMS, EXPLODED VIEWS AND IN THE
PARTS LIST ARE CRITICAL FOR SAFE OPERATION. REPLACE
8. Check the antenna terminals, metal trim,
THESE COMPONENTS WITH SONY PARTS WHOSE PART
Ometallized" knobs, screws, and all other exposed
NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN
metal parts for AC Leakage. Check leakage as
SUPPLEMENTS PUBLISHED BY SONY. CIRCUIT ADJUSTMENTS
described below.
THAT ARE CRITICAL FOR SAFE OPERATION ARE IDENTIFIED
IN THIS MANUAL. FOLLOW THESE PROCEDURES WHENEVER
CRITICAL COMPONENTS ARE REPLACED OR IMPROPER
OPERATION IS SUSPECTED.
AVERTISSEMENT!!
To Exposed Metal
Parts on SetNE JAMAIS METTRE SOUS TENSION QUAND LA BOBINE DE
DEMAGNETISATION EST ENLEVEE.
ATTENTION AUX COMPOSANTS RELATIFS A LA
SECURITE!!
AC
0.15 ?F1.5 kWVoltmeter
LES COMPOSANTS IDENTIFIES PAR UNE TRAME ET PAR UNE
(0.75 V)
MARQUE � SUR LES SCHEMAS DE PRINCIPE, LES VUES
EXPLOSEES ET LES LISTES DE PIECES SONT D'UNE
IMPORTANCE CRITIQUE POUR LA SECURITE DU
FONCTION NEMENT. NE LES REMPLACER QUE PAR DES
Earth Ground
COMPOSANTS SONY DONT LE NUMERO DE PIECE EST
INDIQUE DANS LE PRESENT MANUEL OU DANS DES SUPPLE-
MENTS PUBLIES PAR SONY. LES REGLAGES DE CIRCUIT
DONT L'IMPORTANCE EST CRITIQUE POUR LA
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.
N 3 N |
ACEC
SONY
