Oki OKIPAGE 14i Service Manual page 56

The printing operation is carried out in the following sequence. First, the printing data DATAI3 through DATAI0 are stored, sequentially shifted, in the shift
registers of the LED drivers, by the printing data synchronous clock, CLOCKI. Then the printing data stored in shift registers are latched by the high level pulse of
LOADI. The latched printing data turns the LEDs on by STRB1I-N through STRB4I-N and actuates printing.
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