My 3575 L12 had to have the barcode reader replaced for this problem after
about 6 months.  It seemed to pick on certain slots. IBM adjusted
twice, then replaced.  I have also had some cartridges that the bar code
reader could not read,  and in one case misread the barcode.  This was a
tape
-barcode problem.  Barcode looked fine, but barcode reader could not
read it.  I have had about five of these out of about 1000 tapes.
read it.  I have had about five of these out of about 1000 tapes.
Try tapes in different slots.
Denny P.