6OSXl OBNl 1 KA
50UX22BA/23KA
46UX20BN21 KA
50SX7PA
2. Read and comply with all caution and safety-related 6. Observe original lead dress. Take extra care to assure
notes on or inside the receiver cabinet, on the receiver correct lead dress in the following areas: a. near sharp
chassis, or on the picture tube. edges, b. near thermally hot parts -be sure that leads
and components do not touch thermally hot parts, c. the
AC supply, d. high voltage and e. antenna wiring. Always
3. Design Alteration Warning -Do not alter or add to the inspect in all areas for pinched, out-of-plate, or frayed
mechanical or electrical design of this TV receiver. wiring. Do not change spacing between components, and
Design alterations and additions, including but not between componentsand the printedcircuit board. Check
limited to, circuit modifications and the addition of items AC power cord for damage.
such as auxiliary audio and/or video output connectors,
might alter the safety characteristics of this receiver and
create a hazard to the user. Any design alterations or 7. Components, parts, and/or wiring that appear to have
additions may void the manufacturer?s warranty and may overheated or are otherwise damaged should be re-
make you, the servicer, responsible for personal injury placed with components, parts, or wiring that meet origi-
or property damage resulting therefrom. nal specifications. Additionally, determine the cause of
overheating and/or damage and, if necessary, take cor-
rective action to remove any potential safety hazard.
4. Picture Tube Implosion Protection Warning - The
picture tube in this receiver employs integral implosion
protection. For continued implosion protection, replace 8. PRODUCT SAFETY NOTICE -Many TV electrical and
the picture tube only with one of the same type number. mechanical parts have special safety-related character-
Do not remove, install, or otherwise handle the picture istics some of which are often not evident from visual
tube in any manner without first putting on shatterproof inspection, nor can the protection they give necessarily
goggles equipped with side shields. People not so be obtained by replacing them with components rated for
equipped must be kept safely away while picture tubes higher voltage, wattage, etc. Parts that have special
are handled. Keep the picture tube away from your body. safety characteristics are identified Hitachi service data
Do not handle the picture tube by its neck. by shading on schematics and by a (A) in the parts
list. Use of a substitute replacement that does not have
the same safety characteristics as the recommended
5. Hot Chassis Warning - a. Some TV receiver chassis replacement part in Hitachi service data parts list might
are electrically connected directly to one conductor of create shock, fire, and/or other hazards. Product safety
the AC power cord and may be safety serviced without is under review continuously and new instructions are
an isolation transformer only if the AC power plug is issued whenever appropriate. For the latest information,
inserted so that the chassis is connected to the ground always consult the appropriate current Hitachi service
side of the AC power source. To confirm that the AC literature. A subscription to, or additional copies of
power plug is inserted correctly, with an AC voltmeter Service literature may be obtained at a nominal charge
measure between the chassis and a known earth from Hitachi.
ground. If a voltage reading in excess of 1 .OV 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 regardless of the AC plug
polarity. These chassis can be safely 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 isolated from the AC power line.
The two ground systems are electrically separated by
insulating material that must not be defeated or altered.
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ACEC
