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SECTION VII.
TYPES 204B-II. 204B-12 MAGNETIC TAPE UNITS
POWER MAIN ON
BOT
PERMIT (Indicator)
PROTECT (Indicator)
VACUUM OFF
VACUUM ON
Tape Status Switch
TAPE CHANGE
PROTECT
PERMIT
-.../
OPERATING PROCEDURES
Pressing this alternate-action push-button switch
applies power to the tape unit and causes the MAIN
ON indicator to illuminate.
Pressing this push-
button when the indicator is illuminated removes
power from the tape unit.
This indicator is illuminated when the BOT / EOT
photoelectric sensor detects the beginning-of-tape
reflective marker which establishes the beginning
of the usable portion of the tape.
Pressing this
push- button switch initiates a rewind to the beginning-
of-tape reflective marker.
When the PERMIT indicator is illuminated. it signals
that the tape unit is ready to execute a write instruc-
tion.
For this indicator to be illuminated, the tape
status switch must be in the PERMIT position, both
reels must be mounted, the write-enable ring must
be installed in the supply reel, the tape drive must
be cycled up, the read/write head must be in po-
sition to write, and no rewind operation may be in
progress.
When the PROTECT indicator is illuminated, the
tape drive is unable to write (i. e., one of the con-
ditions outlined above in the description of the
PERMIT indicator is absent).
Pressing this push-button indicator switch remOves
power from the vacuum and pressure supplies and
from all components of the tape unit.
Pressing this push-button indicator switch turns on
the vacuum-pressure pump.
The indicator is not
illuminated until the vacuum level reaches at least
80% of normal.
Pressing the VACUUM ON button
also applies power to the loop chamber vacuum blower
motor for the easy loading (tape mounting) feature of
the tape units.
Setting the tape status switch to the TAPE CHANGE
position starts the rewind sequence to the beginning-
of-tape reflective spot, thus permitting removal of
the tape· reels after the VAC UUM OFF switch has·
been pressed.
Setting the tape status switch to the PROTECT po-
sition prevents writing on tape.
Placing the tape status switch in the PERMIT position
allows tape to be written upon, provided that the
necessary conditions outlined above in the description
of the PERMIT indicator are met.
Mounting and demounting tapes are the basic functions which the operator performs on a
7-3
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