Precautions
11. High voltage is maintained within specified limits18. Picture Tube Implosion Warning :
by close-tolerance, safety-related components andThe picture tube in this receiver employs
adjustments. If the high voltage exceeds the ?integral implosion? protection. To ensure
specified limits, check each of the special continued implosion protection, make sure that
components.the replacement picture tube is the same as the
original.
12. Design Alteration Warning :
Never alter or add to the mechanical or electrical 19. Do not remove, install or handle the picture tube
design of this unit. Example : Do not add without first putting on shatterproof goggles
auxiliary audio or video connectors. equipped with side shields. Never handle the
Such alterations might create a safety hazard. picture tube by its neck. Some ?in-line? picture
Also, any design changes or additions will void tubes are equipped with a permanently attached
the manufacturer?s warranty.deflection yoke; do not try to remove such
?permanently attached? yokes from the picture
13. Hot Chassis Warning : tube.
Some TV receiver chassis are electrically
connected directly to one conductor of the AC 20. Product Safety Notice :
power cord. If an isolation transformer is not Some electrical and mechanical parts have special
used, these units may be safely serviced only if safety-related characteristics which might not be
the AC power plug is inserted so that the chassis obvious from visual inspection. These safety
is connected to the ground side of the AC source.features and the protection they give might be
lost if the replacement component differs from the
To confirm that the AC power plug is inserted original--even if the replacement is rated for
correctly, do the following : Using an AC higher voltage, wattage, etc.
voltmeter, measure the voltage between the
chassis and a known earth ground. If the readingComponents that are critical for safety are
is greater than 1.0V, remove the AC power plug, indicated in the circuit diagram by shading,
reverse its polarity and reinsert. Re-measure the ( or ).
voltage between the chassis and ground.Use replacement components that have the same
ratings, especially for flame resistance and
14. Some TV chassis are designed to operate with 85 dielectric strength specifications. A replacement
volts AC between chassis and ground, regardless part that does not have the same safety
of the AC plug polarity. These units can be safelycharacteristics as the original might create shock,
serviced only if an isolation transformer inserted fire or other hazards.
between the receiver and the power source.
15. Never defeat any of the B+ voltage interlocks.
Do not apply AC power to the unit (or any of its
assemblies) unless all solid-state heat sinks are
correctly installed.
16. Always connect a test instrument?s ground lead to
the instrument chassis ground before connecting
the positive lead; always remove the instrument?s
ground lead last.
17. Observe the original lead dress, especially near
the following areas : Antenna wiring, sharp
edges, and especially the AC and high voltage
power supplies. Always inspect for pinched, out-
of-place, or frayed wiring. Do not change the
spacing between components and the printed
circuit board. Check the AC power cord for
damage. Make sure that leads and components
do not touch thermally hot parts.
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