Oki 390 User Manual page 58

9 Replace the printhead, making sure that the circuit board
at the bottom of the printhead firmly engages the slot (1)
in the carriage.
!
CAUTION! Be sure the printhead is fully inserted before
proceeding.
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58 Microline 390/391 Turbo
32T-hg06.eps
1
10 Reinstall the printhead clamp and swing it back over to
lock the printhead in place.
32T-hg07.eps
!
Important! The clamp must be between the black
projection on the printhead and the metal plate on the
carriage, on both sides.