Roland Advanced Jet AJ-1000 Service Notes page 186

Tighten up the 2 screws shown in the figure.
8
Measure the belt tension again and make sure the tension
9
is between 0.97kgf and 1.18kgf.
Carry out the procedure 6 - 9 again if the tension is not in
the range between 0.97kgf and 1.18kgf.
When this adjustment is finished, carry out [4-10 BELT
POSITION ADJUSTMENT].
<Front View>
<Top View>
4-39
70mm