Dolby Laboratories CP650 Installation Manual download pdf (Page 88)

Dolby

Model CP650 Installation Manual A-Chain Alignment

5-8

5.7 Cell Wiring Check

Verify that the outputs of the right and left

solar cells are properly connected by placing a

white card over the right sound track (nearer

the outside of the projector) and verifying that

the level of the Right channel drops, as

indicated by the Rt Signal Present LED on the

CP650 setup panel.

If the film path, optics, or LED / exciter lamp were adjusted, repeat the previous film-

path alignment and cell alignment steps.

The optimum setting is attained when no

further adjustments are required using the two test films.

5.8 Azimuth Check

Thread and play the Cat. No. 69 P pink-noise

test film.

✓

Out of phase

Incorrect azimuth

Correct

Switch the oscilloscope to the X/Y mode and

adjust the azimuth of the projector optics for

the narrowest diagonal trace.

x x

Not enough light

on one channel

Uneven light on cell

Also, if the ends of the trace display thicker than

the center area, then improper lighting of the

edges of the optical tracks should be corrected.

Note: If necessary, repeat the buzz track and cell alignment

steps or LED/exciter lamp position steps above to reduce

such blooming to a minimum.

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Dolby Laboratories CP650 Installation Manual Page 88