Dolby Laboratories CP650 Installation Manual download pdf (Page 83)

Dolby

Model CP650 Installation Manual A-Chain Alignment

5-3

Remove the existing exciter lamp and replace

with a new lamp.

Adjust the exciter lamp DC voltage to between

70 and 85 percent of the rated voltage. Using

an AC millivolt meter or oscilloscope, verify

that there is no more than 3 percent ripple

present with the lamp on.

LAMP VOLTAGE DC ADJUSTMENT

6 V 4–5 Volts

9 V 6.5–8 Volts

If the projector uses a plastic light pipe or tube,

verify that the light output is not appreciably

affected by dirt, cracks or flaws, yellowing, or

foreign matter. Replace if necessary.

Place a white card at the front of the lens close

to the position of the film sound track. Adjust

the position of the exciter lamp until the image

of the filament is centered both vertically and

horizontally as shown.

If you have difficulty obtaining an image of the

filament, place a piece of tissue paper over the

lens to assist in seeing the image. Some

projectors do not use adjusting screws to

change the position of the lamp; shims are

sometimes used for positioning.

Loosely install the stereo solar cell bracket on

the projector. Position the bracket carefully

until the surface of the cell is 1 mm from the

film plane surface. If this distance is exceeded,

there will be crosstalk between the two optical

stereo tracks. Check the image of the slit on the

cell: It should be a thin sharp line. The slit

image should be the width of the cell, and

positioned three-quarters of the way up the

cell. Try to get the best compromise among all

of these conditions and then tighten the cell

bracket mounting screws.

Confirm that the cell wiring and connections

are correct. Shielded cables must be used. The

inner conductors must be wired to the CP650

OPTICAL input connectors exactly as shown

on the wiring diagram foldout.

Note: The solar cell associated with the right channel is

closest to the edge of the film.

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Dolby Laboratories CP650 Installation Manual Page 83

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