FujiFilm FN-PS551 Service Manual page 257

Maintenance 8. Software Installation
(31) Select the "16777216 Colors" option from the [Color Palette] drop-down list,
the "75 Hertz" option from the [Refresh Frequency] drop-down list, and set
the "640 by 480 pixels" for the [Desktop Area] setting.
(32) Click [Test].
→ The [Testing Mode] information appears.
006-251-05
05.30.2001 FM3069
Maintenance-228
FN-PS551 Service Manual Maintenance-228