Panasonic C1381 - Page 2

IMPORTANT SAFETY NOTICE
There
are
special
components
used
in
Panasonic
Computer
Display
which
are
important
for
safety.
These
parts
are
shaded
on
the
schematic
diagram
and
on
the
replacement
parts
list.
It is
essential
that
these
critical
parts
Be
be
replaced
with
manufacturer's
specified
parts
only
to
prevent
X-RADIATION,
shock,
fire,
or
other
hazards.
Do
not
modify
the
original
design.
ABBREVIATIONS
USED
IN
THIS
MANUAL
ITC
Integral
Tube
Component
AVR
Automatic
Voltage
Regulator
FET
Field
Effect
Transistor
CRT
Cathode
Ray
Tube
DY
Deflection
Yoke
FBT
Flyback
Transformer
CY
Convergence
Yoke
AFC
Automatic
Frequency
Control
MOS
Metal
Oxide
Semiconductor
VR
Variable
Resistor
SAFETY
PRECAUTIONS
GENERAL
GUIDELINES
1.
Use
an
isolation
transformer
in
the
power
line
and
AC
supply
to
troubleshoot.
_
When
servicing,
observe
the
original
lead
dress,
especially
the
lead
dress
in
the
high
voltage
circuits.
If
a
short
circuit
is
found,
replace
ail
parts
which
have
been
overheated
or
damaged
by
the
short
circuit.
-
_
After
servicing,
ensure
that
all
the
protective
devices
such
as
insulation
barriers,
insulation
papers,
shields,
and
isolation
R-C
combinations,
are
properly
installed.
Before
turning
the
display
on,
measure
the
resistance
between
B+
line
and
chassis
ground.
Connect
©
side
of
an
ohmmeter
to
the
B+
lines,
and
©
side
to
chassis
ground,
Each
line
should
have
more
resistance
than
the following specifications:
B+
Line
Minimum
Resistance
5V
370k
Q
12V
164
15V
330k
22
20V
680
Q
25V
14k
2
100V
Ak
Q
5.
Potentials,
as
high
as
24.5kV
are
present
when
this
display
is
in
operation.
Operation
of
the
display
without
the
rear
cover
involves
the
danger
of
a
shock
hazard
from
the
display
power
supply.
Servicing
should
not
be
attempted
by
anyone
who
is
not
thoroughly
familiar
with
the
precautions
necessary
when
working
on
high
voltage
equipment.
Always
discharge
the
anode
of
the
picture
tube
to
the
display
chassis
before
handling
the
tube.
_
After
servicing,
perform
the
leakage
current
checks
to
prevent
the
customer
from
being
exposed
to
shock
hazards.
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