Sylvania 6319CCB, Service Manual, Page: 7 / 108

is performed that involves B+, horizontal deflection
or high voltage. Correct operation of the X-radiation
protection circuits also must be reconfirmed each
time they are serviced. (X-radiation protection cir-
cuits also may be called "horizontal disable" or "hold
down.") Read and apply the high voltage limits and,
if the chassis is so equipped, the X-radiation protec-
tion circuit specifications given on instrument labels
and in the Product Safety & X-Radiation Warning
note on the service data chassis schematic. High
voltage is maintained within specified limits by close
tolerance safety-related components/adjustments
in the high-voltage circuit. If high voltage exceeds
specified limits, check each component specified on
the chassis schematic and take corrective action.
2. Read and comply with all caution and safety-related
notes on or inside the receiver cabinet, on the re-
ceiver chassis, or on the picture tube.
3. Design Alteration Warning -
Do not alter or add
to the mechanical or electrical design of this TV
receiver. Design alterations and additions, includ-
ing, but not limited to circuit modifications and the
addition of items such as auxiliary audio and/or
video output connections, might alter the safety
characteristics of this receiver and create a hazard
to the user. Any design alterations or additions will
void the manufacturer’s warranty and may make
you, the servicer, responsible for personal injury or
property damage resulting therefrom.
4. Picture Tube Implosion Protection Warning
-
The picture tube in this receiver employs integral
implosion protection. For continued implosion pro-
tection, replace the picture tube only with one of the
same type number. Do not remove, install, or other-
wise handle the picture tube in any manner without
first putting on shatterproof goggles equipped with
side shields. People not so equipped must be kept
safely away while picture tubes are handled. Keep
the picture tube away from your body. Do not handle
the picture tube by its neck. Some "in-line" picture
tubes are equipped with a permanently attached
deflection yoke; because of potential hazard, do not
try to remove such "permanently attached" yokes
from the picture tube.
5. Hot Chassis Warning -
a. Some TV receiver chassis are electrically con-
nected directly to one conductor of the AC power
cord and may be safety-serviced without an isolation
transformer only if the AC power plug is inserted so
that the chassis is connected to the ground side of
the AC power source. To confirm that the AC power
plug is inserted correctly, with an AC voltmeter,
measure between the chassis and a known earth
ground. If a voltage reading in excess of 1.0V is
obtained, remove and reinsert the AC power plug in
the opposite polarity and again measure the voltage
potential between the chassis and a known earth
ground.
b. Some TV receiver chassis normally have 85V
AC(RMS) between chassis and earth ground re-
gardless of the AC plug polarity. This chassis can be
safety-serviced only with an isolation transformer
inserted in the power line between the receiver and
the AC power source, for both personnel and test
equipment protection.
c. Some TV receiver chassis have a secondary ground
system in addition to the main chassis ground. This
secondary ground system is not is- olated from the
AC power line. The two ground systems are electri-
cally separated by insulation material that must not
be defeated or altered.
6. Observe original lead dress. Take extra care to
assure correct lead dress in the following areas: a.
near sharp edges, b. near thermally hot parts-be
sure that leads and components do not touch ther-
mally hot parts, c. the AC supply, d. high voltage,
and e. antenna wiring. Always inspect in all areas
for pinched, out of place, or frayed wiring. Check AC
power cord for damage.
7. Components, parts, and/or wiring that appear to
have overheated or are otherwise damaged should
be replaced with components, parts, or wiring that
meet original specifications. Additionally, determine
the cause of overheating and/or damage and, if
necessary, take corrective action to remove any
potential safety hazard.
8. Product Safety Notice -
Some electrical and
mechanical parts have special safety-related char-
acteristics which are often not evident from visual
inspection, nor can the protection they give neces-
sarily be obtained by replacing them with compo-
nents rated for higher voltage, wattage, etc.. Parts
that have special safety characteristics are identified
by a (
#
) on schematics and in parts lists. Use of
a substitute replacement that does not have the
same safety characteristics as the recommended
replacement part might create shock, fire, and/or
other hazards. The Product’s Safety is under review
continu- ously and new instructions are issued
whenever appropriate. Prior to shipment from the
factory, our products are strictly inspected to confirm
with the recognized product safety and electrical
codes of the countries in which they are to be sold.
However, in order to maintain such compliance, it is
equally important to implement the following precau-
tions when a set is being serviced.
FNI 1-2-2 SFTY_2