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Enter service mode, select DAC adjustment
V-RAS and adjust crosshatch pattern to center vertical position to the CRT center.
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Adjust linearity data V-C so that interval of a is same as b (a=b).

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If the v-position is not at the CRT center, adjust
V position V RAS DATA again.
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Adjust H-TRAPEZOID data HTRAP so that the upper and lower lines becomes horizontal.