IBM Personal Computer

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