IBM Personal Computer AT Manual To Operations page 392

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18
Is the screen stable?
YES Go to Step 21.
NO Go to Step 19.
19
Turn the Vertical Hold control clockwise as far
as it will go, and then turn it counterclockwise
until the screen stops rolling and is stable.
,-~
o
Vertical Hold
Control
20
Were you able to make the screen stable?
YES Go to Step 21.
NO Have your display serviced. Be sure the
power cable is with your display.
9000-10 Test

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