When a cassette is inserted, the Model CA2000S automatically lowers the
cassette onto the tape deck and flangeless roller guides extract the tape from
the cassette's shell. The CA2000S will then run a complete cleaning/inspecting
cycle, which is from BOT to EOT and then back. Optical inspection takes place in
the 'reverse' mode. When the cycle is completed the tape is retracted into the
cassette shell and automatically ejected. The units are also capable of fully
In one cycle the tape is automatically extracted from the cassette, wrapped
around four automatically advancing tissue stations, scrapped by a sapphire
cleaning blade, optically inspected and then ejected. The automatically
advancing cleaning tissues are made of non-shedding nylon material that are
placed such that both the oxide and back sides of the tape are cleaned, both
upstream and downstream of the sapphire cleaning blade. The cleaning blade,
which burnishes the tape, is a precise bi-directional double-edged sapphire
blade designed to remove debris adhered to the tape. The CA2000S also has
operator selectable cleaning cycles, allowing the CA2000S to be run unattended.
These selections are: "one pass with tissue and blade", "two
passes with tissue only", "four passes with tissue and blade",
and "four passes with blade and two with tissue only".
The CA2000S incorporates the most advanced tape path in the digital cassette
industry. It is comprised of a completely "flangeless guiding" tape
path and a breakthrough "active guide" design that provides totally
safe and gentle handling of high-density digital tape. This breakthrough design
will not damage the tape in any manner, further it will handle previously
damaged tape as well.
Active guiding has been the subject of many discussions and experiments
throughout the tape industry. It has long been recognized that flanged guides if
not properly aligned will cause significant edge damage. Further, poor tape
stack quality has been traditionally solved by the use of a pack wheel or pack
roller that removes air between layers of tape to provide a precision stack, but
use of a pack wheel is not possible with digital cassettes. BOW Industries’
"active guiding" system provides a uniform tape stack by simply
sensing where the tape is coming out of the cassette shell and making minor
corrections to guide the tape through the tape path and onto the other reel.
FRONT PANEL AND ACCESS PANEL
The front control panel provides the operator with clear at a glance
information. Displayed are; tape in motion, blade remaining, blade in/out,
replace tissue, clean cycles, cassette size and tape footage. A System Monitor
is provided and is always operational. If a failure should occur, a number is
displayed to tell the technician which board or assembly has failed and should
be repaired or replaced.
The tissue spools and sapphire cleaning blade are easily accessible through a
top access door that is located directly over the cleaning station.
In 1978, BOW Industries pioneered the idea of optically scanning the tape for
physical damage. Over the years this technology has been improved to its current
level, which is now available in the Model CA2000S. The optical inspector is a
reflective device that looks for physical damage such as folds, creases,
scratches, and oxide 'nicks' along the helical or transverse scan line. By
placing the sensors along the helical or transverse scan line, we can simulate
the potential loss of data under recording conditions. User adjustable
sensitivity controls allow you to change the length of the 'lost' scan line and
the number of scan lines from 1 to 64. Defects are registered as Center Defect
and Upper/Lower Edge Defects. After the tape has been cleaned and inspected, an
UP/DOWN scan feature, which works in conjunction with a footage counter, locates
the footage at which the defects occurred. This information can be displayed or
printed out for review.
An alternative to optical inspection is magnetic testing. The
Magnetic Testing (MT) option when enabled, records a 1 MHz sine wave across the
full width of the tape. The tape is then read by an in-line multiple track
longitudinal head to detect signal loss, indicating defects. These defects are
stored in RAM for post test examination on the front control displays or sent to
the printer. Those units with Magnetic Testing have an additional control panel
containing separate Threshold and Duration selections for tape edge and center
A Stop on Defect (SD) option, which works in conjunction with the optical
inspector, can also be added that will allow the operator to stop the tape at a
defect location and view the physical defect in the cassette window.
With a fast operating speed of 100 ips (inches per second), gentle tape
handling, precise cleaning and optical inspection, the Model CA2000S is the
choice for maintaining your AMPEX DCRsi digital cassette tape library.