Sharp SL-550 Guia de Resolução de Problemas descarregar pdf (Página 22)

Set-up/Operation • A-22 •

useful for measuring star angles in celestial navigation and for calculating the position

of the sun along the ecliptic during different months of the year.

Setting the Position on the Meridian Projector

The position of the Meridan Projector will be set at the factory, however, it may shift

when changing the bulbs (see page 23) or when in transit. To check alignment, put

the Stareld Cylinder (SL-321) on the projector in the STARLAB dome. Turn on the pro-

jection lamp, the Cardinal Points lamp and the Meridian lamp. If properly aligned,

the 90 degree mark at the top of the dome should be directly over the pole star. The

meridian coordinates at the horizon (0) should be vertically aligned 5 inches above

the cardinal points of N and S.

The thumbscrew towards the front of the projector controls the alignment along the

lines of longitude. When loosened, this screw slides left and right. Slowly slide the

thumbscrew as needed until the meridian scale is aligned directly over the pole star.

Once adjusted, turn the thumbscrew counterclockwise to tighten it.

The thumbscrew nearest the center of the projector (see bottom photo at right) controls

the vertical position of the declination marks (it moves the marks up and down).

Loosen or tighten this thumbscrew as needed to align the declination marks so that the

0 is 5 inches above the cardinal points of N and S. When the scale is balanced, you

are nished setting the Meridian Projector.

Note

The above procedure works with either the Standard or Giant Dome.

Maintaining the STARLAB FiberArc Projector

Note

Before changing any bulb on the STARLAB FiberArc Projector, make certain

you disconnect the projector from the power supply and allow the bulb at

least 5 minutes to cool off.

Changing the Gooseneck Side Lamp Bulbs

Before changing a side lamp bulb, make certain that the gooseneck assembly is

securely attached to the main body of the projector. The side lamps are attached to

the projector by means of a three-pronged connector, which can become disengaged

if the projector is handled roughly. If the gooseneck seems loose, press the small tab

below the connector and pull gently on the assembly so that it disengages completely.

Then insert the end of the gooseneck assembly back into the connector until it “clicks”

rmly into place. If the side lamp still doesn’t light, change the bulb.

The rst step is to remove the plastic cowling that covers the bulb at the end of

the gooseneck. The cowling simply slides on and off. Once the cowling has been

removed, gently press in on the bulb so that it moves deeper into the socket and give

it a slight turn in a counterclockwise direction. The bulb has a bayonet mount, which

means that it has two little tabs holding it in the socket. As you twist it, the bulb should

pop right out of the socket. Take a replacement bulb from the accessory box and

insert it into the socket. Press down slightly and twist in a clockwise direction to lock

the bulb in place. After you have changed the bulb, plug the projector back in and

test it. If the new bulb lights, discard the old bulb and order a replacement as soon as

possible.

Gooseneck neck side lamp with cowling

removed.

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