IBM 727 Manual Of Instruction page 106

Magnetic tape unit and tester, electronic data-processing machines
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Turn O ff Erase Head
Information
Already on
Tape
1
Correct Polari+y
FIG U RE 17a
Incorrect Polarity
FIG U RE 17b
FIG U RE 17.
ERASE HEAD PO LA RITY
Reset R/W Status T g r ., Turning
O ff W rite Heads
-Stopping Distance
- Record W ritten; A ll
Bits
Tape Motion
?
Tape Motion

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