Hitachi C 12LSH Technical Data And Service Manual page 73

Next, insert a 2.5-mm hex. bar wrench into the inlet and
3
adjust the two Seal Lock Hex. Socket Set Screws M5 x 6
[200] so that laser beam is applied to the entire cutting
surface. (Before adjustment of the Laser Marker [198A]
using a 2.5-mm hex. bar wrench, remove the Caution
Label (J) [203], Base Rubber [187A] and the tape
adhered to the inlet.)
If the laser line gets out of the cutting surface during the
laser line adjustment using the two Seal Lock Hex.
Socket Set Screws M5 x 6 [200], turn the Adjuster [191]
to shift the laser line onto the cutting surface, top edge or
rear edge of the cutting surface then adjust the accuracy
of the laser line. (Repeat this operation 3 or 4 times
depending on the adjusting conditions of the laser
marker.) Refer to the above "(1) Construction of laser
marker and functions of each component" for the relation
between the two Seal Lock Hex. Socket Set Screws
M5 x 6 [200] and the laser line.
To check the accuracy of the Laser Marker [198A], move
4
the Laser Marker [198A] horizontally using the Adjuster
[191] again and check that the laser beam is applied to
the entire cutting surface. If the laser beam is applied to
the cutting surface in parallel, the fine fuzz reflects the
laser beam and the entire cutting surface becomes bright.
5 Make a right-angle ink line on the workpieces of 20 mm
(13/16") in height and 150 mm (5-15/16") in width and
60 mm (2-3/8") in height and 150 mm (5-15/16") in width
respectively. Adjust the laser marker and perform cutting.
If the ink line matches the cutting position, the accuracy
adjustment is completed. (Visually check that the laser
marker accuracy is 0.35/100 or less for both the
squareness with the base surface and the squareness
with the fence surface.)
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Fig. 76-b
Fig. 76-c