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PURITY AND CONVERGENCE
ADJUSTMENT
CAUTION
; Convergence
and purity have been factory
aligned.
Do not attempt
to tamper
with these
alignments.
However,
the
effects
of adjacent
receiver
components,
or replacement
of picture
tube or deflection
yoke
may require
the need to readjust
purity and convergence.
If adjustment
is required,
the adjustments
should be made in the following
sequence.
PURITY
ADJUSTMENTS
1.
Use a colour (Red, Green
and Blue) pattern
signal. Receiver
2.
3.
4.
5
should be operated
for at least ten minutes.
Place
the picture
tube face
east or west
and demagnetize
the
picture tube and receiver
using an external
degaussing
coil,
Turn off red and blue rasters
and provide
only
green
raster
on CRT
screen.
Loosen
the screw
holding the deflection
yoke and remove
the three
D.Y. wedges,
and slide the deflection
yoke fully
frontward,
Rotate
the two
rmritv maanet
tabs
(widen
or narrow
the
mutual
angle
made
by th= two tabs)
to center
a vertical
green
stripe.
(If
the
vertical
green
stripe
doesn't
be
obtained,
slide the
deflection
yoke backward)
NOTE:
Do not move the vertical
center
position by adjusting
purity magnet.
6.
Slowly
slide
the deflection
yoke
backward
(or frontward)
until a uniform green raster is obtained.
Note:
7
8.
If some part of screen
is contaminated
with other colors (in
most cases
it will appear
at corner of screen),
put the
Purity
correction
magnet
chip
on back
of that
corner
near
the
deflection
yoke.
See Figure - A to position the purity correction
magnet
chip.
Slide and rotate the purity correction
magnet
chip until pure
green
screen
is obtained.
Use necessary
chips until uniform
green
is obtained
overall
the screen.
Use the tape (or adhesive)
to fix the magnet
on the picture tube.
Check
the
purity
of
the
red
and
blue
rasters
for
uniformity .(Turn
up red raster
and turn off green
and blue
rasters.Turn
up blue
raster
and
turn
off green
and
red
rasters). Readjust
the deflection
yoke
position
if necessary
until all rasters are pure.
If part of the screen
at each
direction
(east,
west,
north or
south)
is colored,
demagnetize
the receiver
and the picture
tube and adjust
the deflection
yoke
position
slightly front
-
ward or backward.
Tiahten
the
mountina
screw
of the
deflection
voke
and
.. =...-
...-
.
m~unt D. Y.wedges.
-
CONVERGENCE
ADJUSTMENTS
Before
any convergence
adjustments
are made,
purity must
be
adjusted
properly.
Connect
cross-
hatch
generator
to
aerial
socket.
Loosen
locking
ring provided
on purity
and
convergence
magnet.
Note: When
adjust the
convergence
magnets,
do not move
purity magnets.
D.Y. wedge
m
Convergence
#-
A
four-pole
\,'-
magnet
tabs ~
k
Deflection
Yoke
-
mounting
screw
x
Convergence
six- pole
magnet
tabs
Purity magnet
tabs
purity
White mark
correct mag
(Part No.
610076599)
Fig,A
Locking ring
(Some
models)
I
4
Purity
Magnet
tabs
[Purity and convergence
magnets]
—5—
d
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