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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 purity magnet
tabs (widen or narrow the
mutual
angle made by the 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:
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.
7
.-. .
8.
L
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) preadjust
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.
Tighten
the mounting
screw of the deflection
yoke and
mount 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
Convergence
four- pole
P-
\"
'agnet
'abs \
I'li
/~
Deflection Yoke
mounting screw
~
>
purity
correct magne
(
(Part No.
,
610078599)
Convergence
six- pole
Purity magnet
tabs
White mark
lip,
(North ~ole )
v
DeflectIon
Yoke ~
,,,
G
o
Fig.A
Locking ring
(Some models)
1
e
Purity
Magnet tabs
[Purity and convergence
magnets]
—4—
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