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US/CA
|
"PURITY, CONVERGENCE AND WHITE BALANCE
*
The locations of SERVICE SWITCH, SCREEN VR, CUT-OFF VR and DRIVE VR are described in the ALIGNMENT
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LOCATION of SERVICE ADJUSTMENT or the SCHEMATIC DIAGRAM.
;
PICTURE TUBE
The picture tube is a precision in-line gun type. For this
(EXAMPLE)
Picture
tube,
dynamic
convergence
is carried
out by a
precision deflection yoke which eliminated the use of con-
vergence yoke and convergence circuit. The adjustment of
picture
tube
is therefore
made easier as only the adjust-
ment of static convergence by using a magnetic is enough.
The
deflection
yoke
and
purity/convergency
magnets
\\S
OU eOLES
assembly
has been set at the factory and requires no field
fh
mA
/
[CONN ERISENDE
adjustments.
fee!
yn
(mark "4")
However,
should
the assembly
be accidentally
jarred or
:
,
tampered with, some or all adjustments may be necessary.
DEF. YOKE
SIX POLES
CONVERGENCE
MAGNET
{mark "6"")
COLOR
PURITY
& VERTICAL
CENTER
Loosen yoke retaining screw (Fig. B-1). With a sharp knife
fee
cut between
the picture tube and the wedge. Remove
MAGNETS (mark "P")
wedges completely and clean off dried adhesive from the
picture tube. PAINT is used to lock the tabs of the purity/
convergence magnet assembly in place (Fig. B-1). The paint
must be removed with the end of a screwdriver before any
adjustments are attempted.
1, Select
no
signal
UHF
channel.
(or Display
a mono-
chrome pattern)
2. Let the purity tabs come in line horizontally as is shown
in Fig. B-2. A long tab should be in the same direction as
the other short tab.
Let the protrusions come
in line
3. Move the yoke slowly backward.
4, Turn the GREEN
CUT-OFF
VR to maximum
and the
RED
and
BLUE
CUT-OFF
VRs
to minimum.
Then
adjust the SCREEN
VR so that the green band can be
seen best. (Fig. B-3.)
(FRONT VIEW)
6. Check the vertical center position by displaying a hori-
zontal
line. (Select the CUT-OFF
SERVICE
SWITCH
from N to S and
a HORIZONTAL
LINE will appear.)
Unless correct, bring it to the nearest center by rotating
the two tabs, kept at an angle, together in either direc-
CENTER
tion. (Fig. B-4)
Bring the green band to the center.
8. Move the yoke slowly towards the bell of the tube 'so
that the whole surface of the picture tube is filled with a
(FRONT VIEW)
green pure raster.
9. Turning
RED
or
BLUE
CUT-OFF
VR
to maximum
and GREEN
CUT-OFF
VR to minimum, make sure of
(REAR VIEW)
Fig. B-3
notches shown in the dotted circles.
Fig. B-4
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