IBM 5155 Manual To Operations page 187

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29
Turn the Brightness control fully clockwise.
Turn the Contrast control fully
counterclockwise.
~
-
­
- - - - " - - - - "
Brightness
Control
30
Does the intensity of the characters decrease?
YES ­
Go to the next step.
NO -
Have the display serviced.
January 1984
Test 9000-11

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