Oki OKIFAX 5750 Service Manual page 492

Board of Part
a NCU board
b LED printhead
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Adjustment
DIP switches to be placed in the same position as on the removed
board. Refer to Chapter 8.
When the rank marking of the replaced LED print head (new part) is the
same as that of the used LED print head (old part), you do not always
have to set the LED print head strobe time by the technical function
(Refer to chapter 5).