are the necessary instructions to be observed
before servicing.
1. An isolation transformer should be
connected in the power line between the
receiver and the AC line when a service is
performed on the primary of the converter
transformer of the set.
2. Comply wi th all caution and safety related
provided on the back of the cabinet, inside the
cabinet, on the chassis or picture tube.
3. To avoid a shock hazard, always discharge
the picture tube's anode to the chassis ground
before removing the anode cap.
4. Completely discharge the high potential
voltage of the picture tube before handling.
The picture tube is a vacuum and if broken,
the glass will explode.
5. When replacing a MAIN PCB in the cabinet,
always be certain that all protective are
installed properly such as control knobs,
adjustment covers or shields,barriers, isolation
resistor networks etc.
6. When servicing is required, observe the
original lead dressing. Extra precaution should
be given to assure correct lead dressing in the
high voltage area.
7. Keep wires away from high voltage or high
tempera ture components.
8. Before returning the set to the customer,
always perform an AC leakage current check
on the exposed metallic parts of the cabinet,
such as antennas,terminals, screwheads,
metal overlay, control shafts,etc., to be sure
the set is safe to operate without danger of
electrical shock. Plug the AC line cord directly
to the AC outlet (do not use a line isolation
transformer during this check). Use an AC
voltmeter having 5K ohms volt sensitivity or
more in the following manner.Connect a 1.5K
ohm 10 watt resistor paralleled by a 0.15µF
AC type capacitor, between a good earth
ground (water pipe, conductor etc.,) and the
exposed metallic parts, one at a time.Measure
the AC vol tage across the combination of the
1.5K ohm resistor and 0.15 uF capacitor.
Reverse the AC plug at the AC outlet and
repeat the AC voltage measurements for each
exposed metallic part. The measured voltage
must not exceed 0.3V RMS.This corresponds
to 0.5mA AC. Any value exceeding this limit
constitutes a potential shock hazard and must
be corrected immediately.The resistance
measurement should be done between
accessible exposed metal parts and power
cord plug prongs with the power switch "ON".
The resistance should be more than 6M ohms.
PRODUCT SAFETY NOTICE
Many electrical and mechanical parts in this
TV receiver have special safety-relate
characteristics.These characteristics are offe
assed unnoticed by visual spection and the
rotection afforded by them cannot necessari l
e obtained by using replacement components
rates for a higher voltage, wattage, etc.The
replacement parts which have these special
safety characteristics are identified by marks o
the schematic diagram and on the parts l
ist.Before replacing any of these components,
read the parts list in this manual carefully. The
use of substitute replacement parts which do
not have the same safety characteristics as
speci fied in the parts list may create shock,
fire, X-RAY RADIATION or other hazards.
