IBM 5155 - Page 186

26 Is the screen white?
YES - Have the unit that the display was
attached
to serviced.
NO - Have the display serviced.
27 Tum the Brightness control fully
counterclockwise.
Brightness Control
28 Does the intensity of the characters decrease?
YES -
Go to the next step.
NO - Have the display serviced.
9000-10 Test January 1984