IBM 3590 - Manual (Page 113)

Leader Block Inspection
See Figure 23 to inspect the tape in the leader block.
The following lists the components required for installation of the leader
block:
1 Incorrectly Installed Tape on a Leader Block
2 Correctly Installed Tape on a Leader Block
3 Incorrectly Installed Tape on a Leader Block
4 Leader Block
5 Insert Pin
6 Tape
Figure 23 shows a correctly installed leader block in item
2 . The tape and
insert alignment in the leader block are critical for correctly loading the tape
into the tape drive subsystem. The tape is centered over the leader block.
There will be a 1.9 millimeters (0.075 inch) gap on both sides of the leader
block with proper tape and insert pin installation. Center both the tape (see
item
6 ) and the insert pin (see item 5 ) over the leader block (see item
4 ). Incorrectly installed leader blocks (see items 1 and 3 ) will cause
damage to the tape drive and to the tape.
Using Non-IBM Cartridges
For maximum performance, use IBM tape cartridges with IBM tape
subsystems.
IBM will charge the customer for time and material of certain required service
and parts. Those are, the use of non-IBM cartridges which cause machine
damage, machine service calls, or parts replacement (other than that which is
caused from normal wear).
A
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Figure 23. Leader Block Installment Procedure
Chapter 8. Cartridge Care and Handling 93