Operating instructions

3-2
• If you know why power was lost and is now back, (there is one or
more LEDs alight in the pushbuttons) check that the format is
appropriate and switch the CP45 out of bypass. The unit will stay
in bypass for about 5 seconds then revert to the format on the
front panel.
• If you don’t know why power was lost keep the unit in bypass
until you can find the reason.
• Be sure that the correct projector and format are selected.
• Check to see if both mains transformer blocks are plugged in
securely to a live outlet.
• If these checks do not restore the sound, and there is at least one
front panel LED on, put up the theatre lights and play your source
of music. If you are not in bypass, switch to format 60 non-sync
first. If the system operates properly in this format, there is no
problem with the equipment following the CP45 in the system
(such as amplifiers and speakers) and the problem may well be in
the projectors. Double-check both projectors and continue the
show on a working projector if you find that one projector is at
fault.
2. If One Channel Fails or is Distorted
Switch the CP45 to bypass; a mono signal is then fed to all three screen
channels. If the distortion persists in one channel, the power amplifier
or speaker for that channel is probably at fault and the amplifier for that
channel should be switched off for the remainder of the show. If the left
channel has failed, also switch off the amplifier for the right channel, so
that only the center channel is in operation. (If the right channel has
failed, also switch off the amplifier to the left channel.)
If you are showing a mono film and the center channel fails or is
distorted, switch the CP45 to bypass so that the mono signal is fed to the
undistorted left and right channels. In this case, turn off the power
amplifier for the center channel.
3. If Switching to Bypass Does Not Restore Sound
• First, check the exciter lamps, the position of all faders and the
remote mute button. Make certain that all components including
power amps are receiving AC power.
• Turn the fader down.
• Check the bypass LED on the CP45; it should be flashing, indicating
that the CP45 switched to the bypass mode. If it is not flashing
and you are absolutely certain that AC power is reaching both the