Essential Check And; Tools - LG LH-CX640 Series Service Manual

PROTECTION,
MAINTENANCE
AND
CHECK
OF
VIDEO
FUNCTION
4-20
2.
Essential
Check
and
Repair
Recording
density
of
the
video is
far
higher
than
the
audio.
Therefore
video
parts
are
very
precise
so
as to
allow
only
error of
1/1000mm
or
so
in
order
to
maintain
compatibility
with
other
videos.
If
one
of
these
parts is
polluted
or
old,
same
phenomena
will
appear
as
they
are
damaged.
To
maintain
clear screen, regular
check,
replacement of old
and
damaged
parts
and oil
supply,
etc
are
essential.
3.
Regular
Check
and Repair
Check
and
repair
schedule
is
not
constant
since
they
vary
depending
on
method that
the
consumer
uses
video
and
environment
where
the
video is
installed
at.
However,
for
the
video
used
by
common
household, good
screen
will
be
maintained
if
regular
check
and
repair
per
1,000
hour
is
performed.
The following
chart
shows
relation-
ship
between
using
time
and
checking
time:
4.
Tools
for
Check
and
Repair
(1)
Grease:
Floil
G-3114
(KANTO) or
equivalent
grease
(Green)
(2)
Grease:
Kanto
G-754,
PL-433
(Yellow)
(3)
Alcohol
(Isopropyl
Alcohol)
(4) Cleaning Patch
(cloth)
5.
Maintenance
Process
5-1)
Removal
of
Foreign
Material
(1)
Removal of
foreign
material
from
video
head
(Fig.
C-9-4)
Firstly
try
to
use
a cleaning
tape.
(1)
Usea
cleaning
patch
if
foreign
materials
are
not
removed
with
the
cleaning
tape
due to
severe
dirty
of
the
head.
Soak the cleaning
patch
in
alcohol
and put
it
to
the
head
tip. Smoothly
turn
the
drum
(turning
cylinder) to
the
right
or
left (In
this
case, the cleaning
patch
must
not
be
moved
vertically).
(1)
After
completely
drying
the
head,
test
the
traveling
status
of
the
tape.
(1)
If
alcohol
(Isopropyl
Alcohol)
remains
at
the
video
head,
the
tape
may
be
damaged
when
this
solution
touches
with
the
head
surface.
Never
use a
cloth
bar
(commercial
sale)
(2) Wipe the
tape
transport
system
and
the
drive
system
with
the
cleaning
patch
soaked
in
alcohol
(Isopropyl
Alcohol)
when
removing
foreign
materials
from
them.
1)
The
part
touched
with
the
traveling
tape is
called
as
tape
transport
system.
The
drive
system
consists
of
parts
to
travel
the
tape.
(2) 2)
Care
must
be
exercised
so that
unreasonable
force
to
change
the
pattern
will
be
applied to the
tape trans-
port
system
during
removal
of
foreign
materials.
About
1
year
One
hour
Table
1
Two
hours
Three
hours
Time
Requiring
Checking
Average
hours
used
per
day
About
18
months
About
3
years
Fig.
C-9-4
Drum
(Turning
Cylinder)
Head
Tip
Soak
alcohol
(Isopropyl
A lcohol).
Cleaning
Patch
(Cloth)
Smoothly
turn
the
drum
(turning
cylinder)
touching
the
soft
surface
to
the
head
tip
surface.