Roland Advanced Jet AJ-1000 Service Notes page 191

Loosen the screw shown in the figure to have a gap about
4
1.0mm between Drive Shaft Support and the head of the
screw.
There is another screw for fixing Drive Shaft
Support on the machine with the Servial Number
from ZU50190 to ZU50220. In this case, loosen
this another screw in the same way as loosening
other screws.
Screw
Move Head Carriage over several times in a whole width and
5
check the position of the belt on Drive Pulley.
The proper position is that Belt is located in the center of
Drive Pulley shown in the figure.
<Front View>
1.0mm
OK
4-44
Screw
Drive Shaft Support