Specifications

3-3
3.3.1 Connect Motor Start Relays
(Models CP500-D, and -70)
For two-projector installations, motor start relays are required for projector
changeover. Digital data on the soundtrack is read in advance of the picture,
therefore an advanced changeover signal is required (see Appendix C). Projector
motor start contact closures provide this signal to the CP500. Isolated contact
closures from mechanical or opto-isolated relays wired across projector motors
must be used. Refer to the Installation Wiring Power and Control diagram at the
end of this section.
Signal levels:
Motor Start Less than 1 Vdc with respect to signal ground.
Motor Off: Greater than 3.5Vdc, less than 18Vdc.
Refer to the unit connections fold-out diagram for details (located at the end of this
manual). For single projector installations, a prewire connector is supplied.
3.3.2 Connect Remote Controls
The CP500 is equipped for use with three types of remote controls: the Cat. No.
689, and Cat. No. 734, which are offered by Dolby Laboratories, and an auditorium
fader, which can be made from parts purchased at an any electronics store.
The Cat. No. 689 CP500 Remote Control duplicates the front panel format
selection, fader, and mute controls of the CP500.
The Cat. No. 734 CP500 Remote Fader consists of a shaft encoder with LEDs to
indicate the fader setting.
The auditorium fader is a 100k linear pot wired as a variable resistor, with
minimum resistance corresponding to fader 10.
Details on how to connect any of these remotes to the CP500 are shown in the
Installation Wiring Power and Control drawing located at the end of this section.