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When the CP Type switch is set to the Auto Digital Enabled position (3), the DA20 will
automatically assert a Format 10 command to the cinema processor, if the DA20 detects that the
cinema processor is in a film format and if there is valid Dolby Digital audio available. The DA20
will not automatically assert Format 10 unless a film format has been asserted first (01, 04, or 05).
See the DA20 Users' manual, issue 4 and above, for specific information on the operation of the
Auto Digital feature.
If you do not wish the DA20 to automatically assert Format 10, then the Auto Digital Disabled
mode (7) should be used. This will disable any format assertions by the DA20.
The Digital Always mode (B) is to be used for testing and theatre alignment only. This selection
disables the reversion system and forces the DA20 to remain in Format 10 always. This mode is
typically used for theatre test and alignment when running film loops to keep the DA20 from
reverting at splices.
NOTE
:
Remember to restore the CP Type switch to 3 or 7 after running test loops. Failure to do so will result in loss of sound if a
faulty or non existent digital soundtrack is encountered.
Operation
Since Format 10 can be set on any of the four format switches on the CP200 front panel, the
operation of the DA20 with this Cinema Processor is different than operation with a CP45, 55 or 65.
When power is first applied to the DA20, with the CP Type switch set to position 3, the DA20 will
sequentially select format switches A through D, looking for Format 10. The DA20 will remember
which format switch is set to Format 10 and will select this format whenever valid digital data is
detected. The DA20 will scan the four format selectors up to 10 times. If no Format 10 setting is
detected, the DA20 will disable the auto-digital feature as it will not know which format selector to
assert. Auto-digital will then remain disabled until one of the CP200 format selectors is set to
Format 10 and the DA20 is power cycled.
If the DA20 detects Format 10 on one of the format selectors, it will stop scanning and begin normal
operation. In either case, the CP200 will be left in whatever format is selected by selector switch D,
regardless of the wakeup format chosen on the CP200.
(2 pages)
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