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2-1
SECTION 2
INITIAL SET-UP AND INSTALLATION
Before you remove or replace the Cat. No. 240A Optical Pre-Amp or the Cat.
No. 249 Power Supply Card, first disconnect AC power from the CP65 to protect the
speakers and the CP65 from damage. For all other modules in the CP65, first switch
to BYPASS; you can then safely remove or replace the desired card without
disconnecting power from the CP65.
Do NOT connect the CP65 to mains power until all connections have been made and all
jumpers have been installed (see STEP 9 later in this section).
STEP 1 If air-conditioning noise is audible in the theatre, arrange for lubrication of
the motor, fan bearings, adjustment of belts and drives, and cleaning of
filters to reduce the ambient noise to a minimum.
If the CP65 replaces an existing cinema sound system, play a typical film
before you remove the old system so you will have a benchmark for
comparison to the new system and as a check of the positioning of the
exciter lamp, the focusing of the sound track lens, and the condition of the
solar cell.
Before you run the film:
• Verify that the existing power amplifiers are in good working order.
• Verify that the existing speakers are in good working order, and that there
is no loose or missing hardware or structural members in the enclosures.
• Verify that all wiring is present and properly connected and that crossovers
are operating and are correctly adjusted.
• Check the phasing of the speaker connections (see Appendix A).
• Verify that there are adequate earth (ground) connections.
• Verify that radio interference problems are adequately resolved.
STEP 2 While you are running the film, listen carefully in various parts of the theatre
for audio system problems:
•Hum.
• Noise, clicks, pops.
• Distortion.
• Poor tonal balance (lack of high-frequency or bass content).
These problems must be resolved before you can proceed to the next step
in the installation.
STEP 3 To avoid heat problems, do not locate the CP65 immediately above or
below the power amplifiers.
Always leave a 1U (43 mm, 1.75") space above and below the CP65 to
provide adequate ventilation. Install an air guide or baffle to deflect hot
air from equipment below the CP65.