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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: 640 x 480 cross-hatch.
b.
Set up external brightness and contrast VR to central position.
c.
Adjusted VR501 have 95Vdc ± 0.5Vdc use digital multimeter
positive leader test J9 positive point, negative leader to ground.
4-2
Vertical linearity adjustment:
a.
Test pattern: 640 x 480 cross-hatch.
b.
Set up external brightness and contrast VR to central position.
c.
Adjust VR302 to make equal distance between top-center and
bottom-center.
4-3
Horizontal-hold adjustment:
a.
Test pattern: 640 x 480 cross-hatch.
b.
Set up external brightness and contrast VR to central position.
c.
Turn off horizontal-sync (pin to ground)
d.
Adjust VR602 to make pattern upright.
4-4
Pin-cushion adjustment:
a.
Test pattern: 640 x 480 cross-hatch.
b.
Set up external brightness and contrast VR to central position.
Adjust VR304 make picture to top and bottom ≤ 2mm, left and right
c.
≤ 2mm.
4-5
Brightness adjustment:
a.
Test pattern: 640 x 480 full-white.
b.
Set up external brightness and contrast VR to maximum.
c.
Test R251, then adjust VR701 to –20Vdc ± 0.1Vdc.
4-6
X-ray protection adjustment:
a.
Test pattern: 640 x 480 cross-hatch.
b.
Test TP2, then adjust VR603 to 5.2 Vdc ± 0.1Vdc.
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