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2. Read and comply with all caution and safety-related
notes on or inside the receiver cabinet, on the receiver
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,
including,
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 may 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 protection, replace
the picture tube only with one of the same type number.
Do not remove, install, or otherwise 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.
5. Hot Chassis Warning - a. Some TV receiver chassis
are electrically connected directly to one conductor of
the AC power cord and may be safely 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 avoltage reading in excess of l.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.
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 thermally hot parts, c. the
AC supply, d. high voltage, and e. antenna wiring. Always
inspect in all areas for pinched, out-of-plate, or frayed
wiring. Do not change spacing between components,
and between components and the printed circuit board.
Check AC power cord for damage.
7. Components,
parts, and/or wiring that appear to have
overheated
or are otherwise damaged
should be re-
placed 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 - Many TV electrical and
mechanical
parts have special safety-related charac-
teristics some of which are often not evident from visual
inspection, nor can the protection they give necessarily
be obtained by replacing them with components
rated
for higher voltage, wattage, etc. Parts that have special
safety characteristics are identified Hitachi service data
by shading on schematics and by a (8)
in the parts
list. Use of a substitute replacement that does not have
the same safety characteristics as the recommended
replacement part in Hitachi service data parts list might
create shock, fire, and/or other hazards. Product safety
is under review continuously
and new instructions are
issued whenever appropriate. For the latest information,
always consult the appropriate current Hitachi service
literature. A subscription
to, or additional
copies of
Service literature may be obtained at a normal charge
from Hitachi.
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