Argox X Series - Manual (Page 88)

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4. If the test print appears as Figure A, remain the screw at the right
of Ribbon Bracket fixed, then loose the screw at the left, and
gradually fine-tune upward, until the print quality gets improved.
If the test print appears as Figure B, remain the screw at the left of
Ribbon Bracket fixed, and then loose the screw at the right, and
gradually fine-tune upward, until the print quality gets improved.