Specifications

10-2
10.1.2 If One Channel Fails or is Distorted
1. Open the front door of the CP500 and switch to Bypass using the pushbutton
switch in the lower right corner. A mono signal is then fed to all three screen
channels. If the problem in one channel persists, the power amplifier or speaker
for that channel is probably at fault. If the problem is not in the Center channel,
switch the faulty amplifier off, being sure that it is not shared with the Center
channel, and finish the show in that condition. If the Right or Left channel has
failed, it may be preferable to switch off both Right and Left power amplifiers.
2. If you are showing a mono film and the Center channel has failed or is distorted,
switch the CP500 to Bypass so that the mono signal is fed to the still-
functioning Left and Right channels. Turn off the power amplifier for the Center
channel.
10.1.3 If Switching to Bypass Does Not Restore Sound
1. First, check the exciter lamps, the fader setting and the mute button. Make
certain that all components including power amplifiers are receiving AC mains
power.
2. With the unit switched to Bypass, verify that the red LED near the front panel
fader knob is illuminated. If it is not, bypass power may be the problem. Check
that a bypass power transformer is connected to the CP500 and plugged in to an
operating AC mains power outlet.
3. If the bypass power appears to be working properly, check if the signal present
lights on the Cat. No. 661 optical preamp card (third slot from the left side of
the unit) are flashing. If they are and sound is still not available, check that AC
power to the power amplifiers has not been lost.
4. If the signal present lights on the Cat. No .661 are not flashing, the circuit card
may be defective, or the bypass power section of the Cat. No 682 (second slot
from the left side of the unit) may have failed. Substitute other known good
cards as a temporary measure. If you substitute another Cat. No. 682, both the
bypass level potentiometer located on the edge of the card and jumper J902 may
need to be adjusted.
10.1.4 If You Hear Extraneous Noises When Playing
a Digital Film
1. Switch the Format to analog (Format 05). If the noises persist, open the front
door of the CP500 and switch to Bypass using the pushbutton switch in the
lower right corner. If the noises still persist, check the power amplifiers as it is
unlikely that both the digital and analog parts of the system have failed.