IBM 5155 - Vertical Hold Adjustment; MM Color Display

Vertical Hold Adjustment
This adjustment is required only if your mM Color
Display has a vertical-hold problem (screen
is rolling
from top
to bottom or from bottom to top.)
Vertical Hold
Control
1 Set the Power switch on the system unit, and the
Power control
on the display, to On.
2 Wait for the POST to finish.
3 Tum the Vertical Hold control clockwise as far
as it
will go, then tum it counterclockwise until
the screen stops rolling and
is steady.
3-34 Color Display