IBM 5155 - Page 183

17 Is your screen blank?
NO - Go to the next step.
YES - Have the unit that the display was
attached to serviced.
18 Is your screen steady?
YES - Go to Step 21.
NO - Go to the next step.
19 Turn the Vertical Hold control clockwise as far
as it
will go, then turn it counterclockwise until
the screen stops rolling and
is steady.
Vertical Hold
Control
January 1984
Test 9000-7