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Tape Maintenance
Tape must be maintained to ensure the proper operation of the tape unit. When
maintaining tape, keep in mind the physical layout of 112-inch magnetic tape, as
illustrated in Figure 4-4. A full reel of tape has a nominal recording length of
2400 ft (732 m). The entire length of the tape is oxide-coated. Beginning- and end.
of-tape sensing is controlled by reflective markers affixed to the Mylar-base side
of the tape. The beginning-of-tape (BOT) marker is attached approximately
16.0 ft (4.9 m) from the physical beginning of the tape, and the end-of-tape (EOT)
marker is attached approximately 25.0 ft (7.6 m) from the physical end of the
tape.
i'+---RECORDING AREA
--~
o 03 IN 0.07 CM
HUB END
0.00
·0.00
g
+
'EOTi
305 M
10 FT
25.0
:g
FT
7.6:6
52 M
PHOTO REFLECTIVE MARKERS -,-_ _ _ _ _.
SHINY
\
b
BACK SIDE
_t_
O-N-E-IN-C-H-=-2-.5-4 C-E-N-n-ME-T-RE.t::S======'---tI/
MAGNETIC SID50.0048 CM :!: .0007
T
ONE FOOT = 0.3048 METRES
0.0019 IN.:!: .0003
Figure
4-4.
Magnetic Tape Layout
Missing or Defective BOT Marker
A missing or defective beginning-of-tape (BOT) marker prevents the completion of
the load operation. Not sensing BOT, the unit rewinds the tape onto the supply
reel. 'lb check the BOT marker, do the following:
1. Open the dust cover door.
2. Remove the supply reel to inspect the condition and location of the patch.
3. Add or replace the BOT patch if necessary, and remount the reel (see
Figure 4-4 for physical specifications).
4. Close the dust cover door and press the RESET button.
5. Resume normal operations to load the tape (see Section 3).
Operator Maintenance
4-11
HD52-00
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