Rice Lake Okidata 320-390-420 Turbo - Service Guide - Manual (Page 33)

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Service Guide ML320/321Turbo
Chapter 2 Operation Description
2.2.3 Head Gap Adjusting (See Figure 2-5 below).
The head gap adjusting lever moves back and forth to tilt the carriage frame, altering the gap between the
printhead and the platen.
The adjusting screw, which is connected to the adjusting gear rotates when the adjusting lever is moved
creating a fine gap adjustment. If the adjusting gear is pushed down, the adjusting screw can be turned
with a screw driver to change the coarse gap adjustment.
When the adjusting lever is set to range 2 - 3, the contact attached to the under side of the carriage cover
will connect with the contact of the space motor PC board. The printer will reduce the printing speed
automatically to ensure that adequate printing pressure is maintained for multipart paper.
Moving the adjusting cam toward the left or right adjusts the guide rail up or down.