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For best results, it is recommended that the purity adjust-
ment be made in final receiver location. If the receiver will
be moved, perform this. adjustment with it facing east, The
receiver must have been operating 15 minutes prior to this
procedure and the faceplate of the CRT must be at room
temperature. The receiver is equipped with an automatic
degaussing circuit. However, if the CRT shadow mask has
degauss it with manual coil. Do not switch the coil OFF
while the raster shows any effect from the coil.
The following procedure is recommended while using a Dot
Generator.
1.. Check for correct location of all neck components.
(See Figure 1.)
2. Rough-in the static convergence at the centre of the
CRT, as explained in the static convergence procedure.
3. Rotate the picture control to centre of its rotation range
and rotate Brightness control to maximum CW position.
4. To obtain a blank raster, connect a short clip lead be-
tween pin @) of 1401
and earth. Then, rotate screen
control CW until normal raster is obtained.
5. Rotate the Red Bias and Blue Bias controls to maximum
CCW position. Rotate the Green bias control sufficiently
in a CW direction to produce a green raster.
TAPE
YOKE
DEFLECTION YOKE
CLAMP
SCREW
10.
11.
DEFLECTION
. Leosen
the deflection
yoke
tilt adjustment
wedges
(three), loosen the deflection yoke clamp screw and
push the deflection yoke as close as possible to the CRT
screen.
. Begin the following adjustment with the tabs on the
round purity magnet rings set together, initially move
the tabs on the round purity magnet rings to the side of
the CRT neck. Then, slowly separate the two tabs while
at the same time rotating them to adjust for a uniform
green vertical band at the centre of the CRT screen.
. Carefully slide the deflection yoke backward to achieve ©
green purity (uniform green screen).
NOTE:
Centre purity was obtained by adjusting the
tabs on the round purity magnet rings, outer
edge purity was obtained by sliding the de-
flection yoke forward. Tighten the deflection
yoke clamp screw.
. Check for red and blue field purity by reducing the
output of the Green Bias control and alternately in-
creasing output of Red and Blue Bias controls and touch
up adjustments, if required.
Disconnect between pin () of 1401 and earth, if connect
ed in step 4.
Perform BLACK AND WHITE
TRACKING procedure.
PURITY
MAGNETS
FOUR-POLE
CONV.
MAGNETS
SIX
POLE
CONV.
MAGNETS
DEFLECTION
YOKE
TILT
ADJUSTMENT
WEDGE
Figure 1. Picture Tube Neck Components Location
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