Installation manual

Dolby

Model CP650 Installation Manual A-Chain Alignment

5-7

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OSCILLOSCOPE TRACES

The adjustment is correct when there is no

signal output while the film is running.

It may

not be possible to adjust for a null with some

older slits; in such instances, adjust for a

minimum and equal signal on L and R.

Some projectors use a lens with an adjustable

slit width.

The adjustment is correct at the

point when the left and right signals both

disappear equally.

5.6 Cell Alignment Check

Remove the SMPTE Buzz Track test film and

thread and play the Cat. No. 97 Stereo Cell

Alignment Film.

If a large amount of crosstalk is present on the

scope display, loosen the stereo solar cell head

and move it from side to side until the crosstalk

is minimum and equal.

Note: The Right channel is the track toward the outside of

the projector. On some projectors, it may be necessary to

stop the film to adjust the position of the cell.

Lock the cell bracket into position after

completing this adjustment. Check that the

crosstalk does not change as the bracket is

tightened.