Service manual
Table Of Contents
SAFETY
PRECAUTIONS
1. This
product
contains special designed circuits and
components
that
were designed
for
safety
purposes.
For continued
protection,
changes should
not
be made
to
the
original design unless authorized
in
writing
by
the
manufacturer. Replacement parts
must
be identical
to
those used in
the
original
circuits. Service should
be
performed
by
qualified personnel only.
2. Alterations
to
the
design or
circuitry
of
this
receiver should
not
be made.
Any
design alterations
or
additions
will
void
the
manufactuer's
warranty
and
will
further
relieve the
manufacturer
of
responsibility
for
personal injury or
property
damage resulting
therefrom.
3.
Many
electrical and mechanical parts in MONITOR sets have special safety-related characteristics.
These characteristics 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,
watt-
age, etc. Replacement parts
which
have these special
safety
characteristics are identified in
the
parts list
of
this
service manual. Electrical
components
having such features are identified
by
shading on the schematics and by
(*)
on the parts list in this service manual. The use
of
a substitute
replacement
which
does
not
have
the
same
safety
characteristics
as
the
recommended
replacement part
shown
in
the
parts list
may
create shock, fire,
or
other
hazards.
4.
If
any repair has been made
to
the chassis,
it
is recommended the
the
B1
setting
be checked
or adjusted (See ADJUSTMENT
OF
B1
VOLTAGE).
5. The high voltage applied
to
the picture tube must conform
with
that
specified in this service manual.
Excessive high voltage can cause an increase in X-Ray emission, arcing and possible
component
damage, therefore operation under excessive high voltage conditions should
be
kept
to
a minimum,
or should
be
prevented.
If
severe arcing occurs, remove
the
AC
power
immediately and deter-
mine
the
cause by visual inspection (incorrect installation, cracked or melted high voltage harness,
poor soldering, etc.).
To
maintain
the
proper
minimum
level
of
soft
X-Ray emission,
components
in
the
high voltage
circuitry
including
the
picture
tube,
must
be
the
exact
replacements
or
alter-
natives approved
by
the
manufacturer
of
the
complete product.
6. Do
not
check high voltage by
drawing
an arc. Use a high voltage meter
or
a high voltage probe
with
a
VTVM.
Discharge
the
picture
tube
before
attempting
meter connection
by
connecting a
clip lead
to
the ground frame and connecting the other end
of
the lead through a 1
OkO
2W
resistor
to
the
anode
button.
7. When service is required, observe
the
original lead dress. Extra precaution should be given
to
assure
correct
lead dress in
the
high voltage
circuit
area. Where a
short
circuit
has occurred,
those components
that
indicate evidence
of
overheating should be replaced.
Always
use the
manufacturer's
replacement components.
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