Projection Devices, Continued
Projector racks
Make sure slide projectors and programmers or dissolve units are securely
mounted to a stable projector rack. Keep all electrical and connector cords
from being pinched between devices. Position the projector rack so that the
projectors are at a 90-degree angle to the screen and deck to prevent
keystoning. Also consider ventilation, cooling, and access to the projection
devices when you position the projector rack.
Video cassette
recorders
players (VCR)
Video cassette recorders/players (VCR) combine a synchronized audio and
video presentation. The operation of a VCR is easy, as many individuals are
already familiar with the operation of their home VCR. VCR presentations
are excellent for small audiences. When you give a presentation to a large
group, hook up several monitors and strategically place them throughout the
briefing theater. VCRs require the addition of a television monitor and
occasional jams will badly damage a tape.
Nomenclature
Most adjustment points of a VCR are self-explanatory. There is a cassette
port, an on/off switch, a forward/fast forward button, a rewind/reverse
button, a record button, a playback button, a pause button, a stop/eject
button, a speed control switch, and a tracking dial. The two adjustments you
may not be familiar with are the speed control switch and the tracking dial.
SPEED CONTROL SWITCH: This switch allows the operator to switch
from standard tape advance speed (SP) to long standard advance speed (LSP).
Switching from SP to LSP increases the amount of recording time on a tape.
TRACK DIAL: An incorrectly tracking tape will chatter, appear out of
synchronization, or show distinct horizontal frame lines on the monitor.
Adjust the track of the tape by moving the dial until the projected image is
steady.
Use
When you use a VCR, make sure the tape is correctly inserted into the
cassette port. Take care not to re-record inadvertently over a recorded tape.
To make sure a tape is not able to record, break the small plastic tab on the
tape cartridge and discard the tab. Occasionally, clean the tape heads with a
tape head cleaning tape.
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