Aiwa TV-AS216, Service Manual

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(1) Receive the green raster signal from the pattern generator.
(2) Loosen the magnet lock screw, and shift the magnet assembly
backward (toward the neck).
(3) Loosen the DY lock screw, and shift the DY deflecting yoke
backward (toward the neck).
(4) After opening the two purity magnets to the same angle, adjust
the color width of the bands on both sides of the screen so that
they are equal. (refer to Fig. 1-5 (a)).
R G B
Fig 1-5 (a)
As shown in Fig. 1-5 (b), the purity magnet functions in
relation to the electron beam.
(5) Gradually shift the deflecting yoke toward the front (toward
the CRT funnel). Stop movement at the point when the screen
has become completely green.
S N N S NS SN
NN
SS
S S
N N
Fig 1-5 (b)
(6) Also, verify the respective monochromatics of red and blue.
(7) While looking at the screen, adjust the tilt of the deflecting
yoke and tighten the DY lock screw.
(8) Shift the magnet assembly to the front (toward the CRT funnel),
stop movement before the adjustment position and then tighten
the magnet lock screw.
At this time, be careful not to shift the position of the purity
magnet.
R=B
As there is occurrence of convergence distortion after
completing the landing adjustments, be sure to carry out
convergence adjustments.
If the color irregularities in the screen’s corner section are
not improved, correct them with the landing magnet. After
using the landing magnet, be sure to demagnetize the CRT
with degausser and verify that there is no occurrence of color
irregularity. (refer to Fig. 1-6)
Landing magnet: 81-JTI-710-010
(two-sided adhesive tape) : 80-XVI-218-010 Cushion
Cushion
Landing magnet
Since the landing magnet is polarized,
check the screen’s improvement through
rotation, not only by position.
Fig 1-6
1-3. Beam Landing Adjustment