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4
ADJUSTMENT PROCEDURE
This alignment procedure is for adjusting/testing picture performance. In
order to obtain the optimum result, the following adjustment sequence
must be followed step by step:
4-1
Check B+ voltage
(a)
Test pattern: cross hatch
(b)
Set up external brightness and contrast VR to central position
(c)
Make sure 30Vdc = 0.1 Vdc use digital multimeter positive lead
test D913 negative point, negative lead to ground.
4-2
Vertical linearity adjustment:
(a)
Test pattern: cross hatch
(b)
Set up external brightness and contrast VR to central position
(c)
Adjust VR300 to make equal distance between top-centre and
bottom-centre.
4-3
Horizontal-hold adjustment:
(a)
Test pattern: cross hatch
(b)
Set up external brightness and contrast VR to central position
(c)
Turn off horizontal-sync (pin to ground)
(d)
Adjust VR400 to make pattern upright.
4-4
Geometric distortion pattern adjustment:
(a)
Test pattern: cross hatch
(b)
Set up external brightness and control VR to central position
(c)
Adjust eight magnets on the deflection yoke make picture to the
best condition.
4-5
Video Centering adjustment
(a)
Test pattern: cross hatch
(b)
The video is centered by rotating the two small magnetic rings at
the rear of the yoke.
4-6
Horizontal-width adjustment
(a)
Test pattern: cross hatch
(b)
Set up external brightness and contrast VR to central position
(c)
Adjust L401 to make picture width within 228 + 4 mm.
4-7
Vertical height adjustment:
(a)
Test pattern: cross hatch
(b)
Set up external brightness and contrast VT to central position
(c)
Adjust VR301 to make height to 170 = 4 mm.
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