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SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK ! OR DOTTED LINE WITH
MARK ! 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
PUBLISHED BY SONY.ATTENTION AU COMPOSANT AYANT RAPPORT
Ë LA SƒCURITƒ!
LES COMPOSANTS IDENTIFƒS PAR UNE MARQUE ! SUR LES
DIAGRAMMES SCHƒMATIQUES ET LA LISTE DES PIéCES SONT
CRITIQUES POUR LA SƒCURITƒ DE FONCTIONNEMENT. NE
REMPLACER CES COMPOSANTS QUE PAR DES PIéSES SONY
DONT LES NUMƒROS SONT DONNƒS DANS CE MANUEL OU
DANS LES SUPPƒMENTS PUBLIƒS PAR SONY.
DIFFERENT SPECIFICATIONS
MODEL
SPECIFICATIONS
AUDIO SYSTEM
TUNER AUDIO
(STEREO) SYSTEM
VCR+ SYSTEM
LINE 2 INPUT
BODY COLOR
DUAL MODE SHUTTLE
REMOTE COMMANDER
SLV-478
MONAURAL
Ñ
Ñ
Ñ
BLACK
Ñ
RMT-V231A
SLV-L67HF SLV-L68HF
HiFi-STEREO
SAP
Ñ
Ñ
BLACK TITAN
Ñ
RMT-V231
SLV-688HF
HiFi-STEREO
SAP
BUILT-IN
BUILT-IN
BLACK
Ñ
RMT-V231B
SLV-L47 SLV-L48
MONAURAL
Ñ
Ñ
Ñ
BLACK
Ñ
RMT-V230
SLV-L57 SLV-L58
MONAURAL
Ñ
Ñ
BUILT-IN
BLACK
BUILT-IN
RMT-V232
MODEL
SPECIFICATIONS
AUDIO SYSTEM
TUNER AUDIO
(STEREO) SYSTEM
VCR+ SYSTEM
LINE 2 INPUT
BODY COLOR
DUAL MODE SHUTTLE
REMOTE COMMANDER
SLV-677HF SLV-678HF
HiFi-STEREO
SAP
Ñ
Ñ
TITAN BLACK
Ñ
RMT-V231A
SLV-L77HF SLV-L78HF
HiFi-STEREO
SAP
Ñ
BUILT-IN
BLACK TITAN
BUILT-IN
RMT-V232
SLV-X50
MONAURAL
Ñ
Ñ
Ñ
TITAN
BUILT-IN
RMT-V232
SLV-X60HF
HiFi-STEREO
SAP
Ñ
Ñ
TITAN
Ñ
RMT-V231
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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-soldered
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 high-wattage resistors.
3. Look for unauthorized replacement parts, particularly
transistors, 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
recommend their replacement.
5. Check the line cord for cracks and abrasion.
Recommend the replacement of any such line cord to the
customer.
6. Check the B+ voltage to see it is at the values specified.
7. Check the antenna terminals, metal trim, "metallized" knobs,
screws, and all other exposed metal parts for AC leakage.
Check leakage as described below.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 chassis, must not exceed 0.5mA (500 microampers).
Leakage current can be measured by any one of three methods.
1. A commercial leakage tester, such as the Simpson 229 or RCA
TW-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 battery-operated AC voltmeter. The "limit" indication
is 0.75V, so analog meters must have an accurate low voltage
scale. The Simpson 250 and Sanwa SH-63Trd are examples
of a passive VOM that is suitable. Nearly all battery operated
digital multimeters that have a 2V AC range are suitable. (See
Fig. A)
To Exposed Metal
Parts on Set
0.15
µF
1.5 k ½
AC
Voltmeter
(0.75 V)
Earth Ground
Fig. A. Using an AC voltmeter to check AC leakage.
