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CKP-110
SAFETY
PRECAUTIONS
WARNING : Since the chassis of this receiver is connected
to one side of the Mains Supply during operation, service
should
not be attempted
by anyone
unfamiliar
with the
precautions
necessary
when
working
on
this
type
of
equipment. The following precautions should be observed.
1.
. When
service
Do
not
install, remove,
or handle the picture tube in
any
manner
unless
shatter-proof
goggles
are
worn.
People
not
so equipped
should
be kept
away
while
picture
tubes
are
handled.
Keep
picutre
tube
away
from
the
body
while
handling.
is required,
an
isolation § transformer
should be inserted between power line and the receiver
before
any
service is performed
on a "HOT"
chassis
receiver.
. When
replacing chassis in the cabinet, all the protective
devices are put back
in place, such
as; barriers, non-
metallic
knobs, adjustment and compartment
cover or
shields, isolation resistor-capacitor,
etc.
. When
service is required, observe the origian! lead dress.
Extra precaution should be taken to assure correct lead
dress in the high voltage circuitry area.
. Always use the manufacturer's replacement component.
Especially critical components as indicated on the circuit
diagram should not be replaced by other makes.
Furthermore where a short-circuit has occurred, replace
those components that indicate evidence of overheating.
. Before
returning a serviced
receiver to the customer,
the service technician must throughtly test the unit to
be certain that it is completely
safe to operate without
danger of electrical shock, and be sure that no protective
device built into the instrument by the manufacturer has
become defective, or inadvertenly defeated during servic-
'Ing.
Therefore,
the following checks are recommended
for
the continued
protection of the customers
and service
technicians.
INSULATION
Insulation
resistance
should
not be less than
7M{2 at
5O0V
DC between the mains poles and any accessible
metal parts.
Also, No flashover or breakdown
should occur during
the dielectric
strength test, to apply 4KV
AC for one
minute between the mains poles and any accessible metal
parts.
HIGH
VOLTAGE
High voltage should
always be kept at rated value of
the chassis -no-higher. Operating at higher voltage may
cause a failure of the picture tube or high voltage supply
and, also, under certain circumstances could produce X-
radiation
moderately
in excess of design
levels.
The
high voltage must not, under any circumstances, exceed
26KV on the chassis.
X- RADIATION
TUBES:
The
primary
source
of X radiation
in this
receiver is the picture tube.
The tube utilized for the
above
mentioned
function
in this chassis
is specially
constructed to limit X radiation.
For continued X radiation protection,
the replacement
tube must be the same type as the original,
HITACHI
approved type.
PRODUCT
SAFETY
NOTICE
Many
electrical
and
mechanical
parts
in
HITACHI
television receiver have special safety related character-
istics. These charactristics are often not evident
from
visual
inspection
nor
can
the protection
afforded
by
them
necessarily
be obtained
by
using
replacement
components
rated
for
higher
voltage,
wattage,
etc.
Replacement
parts
which
have
these
special
safety
characteristics are identified in this Service Manual.
Electrical components
having such
features
are identi-
fied by marking with a A on the schematics
and on
the replacement parts list in this Service Manual.
The use of a substitute repalcement
component which
does
not have the same
safety characteirstics as the
HITACHI
recommended
repalcement
one,
shown
in
the parts list in this Service Manual, may create electrical
shock, fire, X radiation, or other hazards.
Product
Safety
is continuously
under
review
and new
instructions are issued from time to time. For the latest
information,
always
consult
the
current
HITACHI
service Manual.
A subscription to, or additional copies
of, HITACHI
Service
Manual
may
be obtained
at a
nominal
charge from your HITACHI
SALES CORPO-
RATION.
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