CPD-2403
SAFETY CHECK-OUT
After correcting the original service problem, perfLeakaorgm te Theste
following safety checks before releasiset to theng the
The AC eakage from any elxposed 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
1. Check the area of your repair for unsoldered or poorly-
microampere). Leakage current can be measured bone ofy any
soldered connections. Check the entire board surface
three methods.
for solder splashes and bridges.
2. Check the interboard wiring to ensure that no wires are1. A commercial leakage tester, such as the Simpson 229 or
?pinched? or contact high-wattage resistors.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 batter Bey-operated AC milliammeter. The Data Precision 245
absolutely certain that you have replaced all thedigital multimeter is suitable for this job.
insulators.
3. Measuring the voltage drop across a resistor by means of
4. Look for unauthorized replacement parts, paraticular VOM or batterlyy-operated AC voltmeter. The "limit"
transistors, that were installed during a previous repairindication is 0.75 .alog meters V, so anust hamve an accurate
Point them out to the customer and recommend theirlow voltage scale. The Simpson's 250 and SanwSH-63Trda
replacement.are examples of passive VOMs that are suitable. Nearly
all battery operateddigital m ultimeters that have a 2V AC
5. Look for parts which, though functioning, show obvious
range are suitable. (See Figure A)
signs of deterioration. Point them out to the customer
and recommend their replacement.
WARNING!!
6. Check the line cords for cracks and abrasion.
Recommend the replacement of any such line cord to
NEVER TURN ON THE POWER IN A CONDITION IN WHICH THE
the customer.
DEGAUSS COIL HAS BEEN REMOVED.
7. Check the B+ and HV to see if they are specified values.
Make sure your instruments are accurate; be suspiciousSAFETY-RELATED COMPONENT WARNING!!
of your HV meter if sets always have low HV.
COMPONENTS IDENTIFIED BY SHADING AND MARK ON THE
8. Check the antenna terminals, metal trim, ?metallized"
SCHEMATIC DIAGRAMS, EXPLODED VIEWS AND IN THE PARTS
knobs, screws, and all other exposed metal parts for
LIST ARE CRITICAL FOR SAFE OPERATION. REPLACE THESE
AC Leakage. Check leakage as described below.
COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS
APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS
PUBLISHED BY SONY. CIRCUIT ADJUSTMENTS 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!!
NE JAMAIS METTRE SOUS TENSION QUAND LA BOBINE DE
To Exposed Metal
Parts on SetDEMAGNETISATION EST ENLEVEE.
ATTENTION AUX COMPOSANTS RELATIFS A LA SECURITE!!
LES COMPOSANTS IDENTIFIES PAR UNE TRAME ET PAR UNE
MARQUE SUR LES SCHEMAS DE PRINCIPE, LES VUES
AC
EXPLOSEES ET LES LISTES DE PIECES SONT D'UNE
0.15 ?F1.5 kWVoltmeter
(0.75 V)IMPORTANCE CRITIQUE POUR LA SECURITE DU
FONCTIONNEMENT. NE LES REMPLACER QUE PAR DES
COMPOSANTS SONY DONT LE NUMERO DE PIECE EST
INDIQUE DANS LE PRESENT MANUEL OU DANS DES
SUPPLEMENTS PUBLIES PAR SONY. LES REGLAGES DE
Earth Ground
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
Figure ALORSQU'UN MAUVAIS FONTIONNEMENT SUSPECTE.
? 4 ? |
ACEC
