Operating instructions

3-3
CP45 transformers, the bypass transformer wires must have come
unscrewed from the back panel connections or, (this is very
unlikely) the transformer has failed internally.
• If you have a spare Cat. No. 514 optical preamp module, switch
off the power amps and processor and replace the Cat. No.514 in
the CP45 with the spare. Switch the power amps back on and
check if sound is restored.
• If replacing the Cat. No.514 does not restore sound in the bypass
mode, the bypass circuitry within the Cat. No.510 circuit card
may have failed. If you have a spare, disconnect power from the
CP45, switch off the power amplifiers, and replace the Cat. No.510
in the CP45 with the spare. Apply power to the CP45 and turn on
the power amps to see if sound is restored.
4. Excessive or Inappropriate Sound from the Surround Speakers
As an emergency measure to continue the show, switch off the surround
channel amplifiers. At your next opportunity, find out if the problem is
related to the film print itself or the theatre sound system.
• If the film sound was mixed to include surround information, as
are the vast majority of Dolby encoded films, the problem may be
in;
a. The sound system (speakers, power amps), or
b. The alignment of the solar cell in the projector, or
c. The Cat. No.514 optical preamp, or
d. The Cat. No.511 main board decoder section.
Continue the show with the surround amplifiers off and have the
problem corrected later by your service engineer.
B. BETWEEN SHOWS
If the CP45 selected bypass itself and there are no LEDs alight in the
buttons on the front panel. The shows will have to continue in bypass
until the unit can be serviced; however, if manually selected bypass
operation was required to complete a show and your preliminary
checks suggest that the cause of a problem may be a fault within the
CP45, you can take some further steps when you have more time
between shows.