Reichert LongLife Project-O-Chart 12084, Руководство пользователя

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12084-101 Rev. D Page 9
NOTE: To obtain longer refracting distances in small
rooms, a mirror system can be used. A high
quality front-surface mirror is required. See
Figure 5 as an example of an arrangement
for a short room with full 20 foot refracting
distance.
SLIDE SELECTION
The cross slide (3) contains three apertures which
index into position in front of any frame of characters
projected from the acuity slide. The large aperture
is centrally located on the slide. In this position,
an entire frame of characters is projected onto the
screen.
By moving the slide to the left or right of the central
position, either the vertical line aperture or the red
and green ilters (Duochrome Test) will be moved into
position for projection.
To attach the cross slide, unscrew one of the knobs
and insert the slide into the slot, through the projec
-
tor. When inserting the cross slide, be certain that the
frame holding the ilters faces towards the rear of the
instrument and that the index notches face upward.
The cross slide, as well as the horizontal line selector
(2), may be operated from either the left or the right
side of the instrument. When the horizontal line se-
lector is used with the vertical aperture of the selector
slide, projection of single characters is possible.
BULB LIFE
The LongLife P-O-C uses the 11143 Halogen Bulb
(20) to produce a superb combination of brightness
and long bulb life.
You can maximize the bulb’s useful life by following
these guidelines:
1. After turning the unit “ON”, use it for at least one
hour.
2. If you do not plan to use the projector for at least
an hour, turn the unit “OFF”.
3. Regardless of the bulb’s expected life, it is good
practice to always have a spare bulb available.
FILAMENT ALIGNMENT
There should be no need to align the ilament. Should
you want to align or check the alignment of the bulb’s
ilament proceed as follows:
1. Turn “OFF” the projector and disconnect power
cord from projector and wall.
2. Remove the rear cover.
3. Reconnect power cord to projector and wall
outlet.
4. Mark inner and outer objective tubes to identify
their positions.
5. Loosen locking screws and slide both tubes into
unit as far as possible.
WARNING: DO NOT REMOVE BULB REFLEC-
TOR HOUSING (19). LAMP IS VERY
BRIGHT AND MAY POSSIBLY
EXPLODE.
6. Turn on the projector and hold a card or piece of
paper 1" (25mm) in front of the objective tube.
7. Adjust the three adjustment screws located on
the bulb base so that the image of the ilament is
centered and in best focus.
8. Check for even ill of screen with no noticeable
darkening in any corner of the screen. If darken-
ing occurs, readjust the three adjustment screws
to correct any darkening.
9. Reposition the objective tubes to their previous
position and tighten lock screws.
INTERNAL FUSE
This instrument contains an internal fuse to assure
safe operation and continued high performance. If
you need to replace the fuse please follow these
procedures:
1. Turn the projector “OFF”
2. Unplug the power cord from the wall and the
instrument.
3. Remove the rear cover as described in the
section on Bulb Replacement (see page 8).
4. Locate fuse in lower portion of the electrical
assembly.
5. Remove the fuse cover and gently remove the
fuse from the holder.
6. Replace the fuse with a fuse of the same size
and rating. The size and rating is printed in a
triangular label underneath the fuse or on the
fuse itself.
CARE OF THE INSTRUMENT
This projector requires very little care. The exterior
housing is can be cleaned with any mild soap or
detergent. Occasionally wipe the slides and focusing
tube with a soft clean dry cloth.
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