– 4.17 –
4-2-6. Adjustment of the head unit
[The case that needs adjustment]
• Perform this adjustment after replacement of each head and inclination adjustment, if the
X dot position correction value exceeds ±8 dot (rough standard). The purpose of this
adjustment is to improve the 3/4 pass plotting quality.
• Make adjustment with the head lowered to the bottom position.
• Be sure to perform adjustment with the Head cover BKT attached.
[Adjusting procedure]
1) Replace each head lock screws with M4 screws.
2) Loosen four head unit base mounting screws. Do not loosen the supporting point screws.
3) Insert a 1.2mm spacer between the unit base and the Head BKT and then, while lightly
pressing it, fasten the mounting screws.
< If there is no spacer >
Use a unit adjuster instead of clamping the spacer. Since the unit adjuster is not used at
the time of shipment, when using it, lightly apply the unit base adjuster before step 2).
(If LM positions at the front, turn the adjustment screw counterclockwise; if LM positions
at the back, turn it clockwise.)
4) Select [#ADJUSTMENT - #HEAD ADJUST - #UNIT] and then print the adjustment pattern.
5) Check the dot position of light magenta for black dots and then determine the rotational
direction of the unit.
(If LM positions at the front, make the spacer thinner; if LM positions at the back, make it
thicker.)
6) Repeat steps 3) to 5) above so that the X dot position correction value is set to ±8 dot
(0.28mm from Cyan to Light Magenta in reference to Black) or less.
Adjust spacer
Mounting screw
Mounting screw
Unit adjuster
Adjusting screw
Mounting screw
Mounting screw
Supporting point screw
Head cover BKT
Head unit base
Head BKT
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