Operating instructions

3-1
SECTION 3
TROUBLESHOOTING
Your theatre sound system consists of a number of critical audio
components in addition to the Dolby CP45. Thus, the first step when
something goes wrong with the sound is to find the source of the
problem. The troubleshooting chart starting on page 3-6 can be helpful.
If the troubleshooting chart is not sufficient for finding and solving the
problem right away, the procedures in the following paragraphs should
be helpful. Each paragraph is gauged to the time available for
troubleshooting; during a show, between shows, and after closing. In
addition, Appendix C contains brief descriptions of each circuit module,
which will further help you to track down any problems with the CP45.
If you are unable to solve the problem using the information which
follows, call your local authorized service engineer.
A. DURING THE SHOW
1. If Film Sound Is Lost
• Check that the correct projector is selected.
• Check to see if the exiter lamp on the active projector is on.
• Check to make sure that the power amps are on.
• Immediately switch the CP45 to bypass. (Push up the small slide
switch on the right hand side of the front panel under the green
signal present indicators). If sound is restored, troubleshooting
can be performed later.
• Check to see if any of the LED’s on the front panel are on. If no
front panel LED's are on, the processor has lost all power. Find
out why immediately. Check if anything else has lost power.
• Disconnect mains transformer blocks from the wall socket/outlet.
Re-connect to a different socket/outlet powered by a different
mains circuit.
• If there are now at least two LEDs on, (a projector indicator and
bypass flashing) and sound does come back on, it will be mono
but you can continue the show while you try to find the source of
the trouble.