Dolby Laboratories CP650 User Manual download pdf (Page 29)

Dolby

CP650 Digital Cinema Processor User’s Manual

4-1

Chapter 4

Troubleshooting

Your theatre sound system consists of a number of critical audio components in

addition to the Dolby

CP650. Thus, the first step when something goes wrong with

the sound is to determine which component is causing the problem. If you are unable

to solve the problem using the information that follows, call your local authorized

service engineer. Appendix C.4 contains a list of circuit boards available. The

troubleshooting Table 4–1, located at the end of this chapter, may also be helpful.

If Film Sound Is Lost

If film sound is lost, take the following steps:

1. Check that the correct format button is glowing on the CP650 front panel, and that

the correct projector (P1 or P2) is selected.

2. Verify that the lamp or LED is on in both the analog and digital (if present) film

readers.

3. Confirm that the mute button is not flashing, and that the fader display is 4.0 or

above. If your installation uses a remote auditorium fader, check its setting.

4. Switch the CP650 to Bypass mode by pressing the front-panel bypass power

button. If sound is restored it will play in mono, but you can continue the show

while you try to find the source of the trouble.

5. If these steps do not restore film sound, press the front-panel bypass power button

again. When the CP650 self-test is finished, press the NS front-panel button and

play your source of intermission music. If the system operates properly in this

format, there is no problem with the equipment following the CP650 (such as

power amplifiers and loudspeakers). The problem may be in the projectors.

Double-check both projectors, and if possible, continue the show using the other

projector.

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Dolby Laboratories CP650 User Manual Page 29