Oki C5400 Reference page 49

Initialise Disk
This utility will erase the hard disk of the printer and cause it to
rebuild the directories.
Select the Disk to erase and click the button to execute. This
1.
action, once executed cannot be undone.
Substitute Fonts
This function is not supported for a non-kanji printer.
PS Gamma Adjuster
To open PS Gamma Adjuster, open SDM, then select PS Gamma
Adjuster form the Utilities drop-down menu.
This option allows adjusting the gamma output, or toner density,
when printing from the printer. The Gamma Curve profile is sent to
the printer with the print job.
Macintosh OS 9x: Utilities • 49