Dolby Laboratories CP650 User Manual download pdf (Page 31)

Dolby

CP650 Digital Cinema Processor User’s Manual Troubleshooting

4-3

Table 4-1 Troubleshooting Chart

Symptom Possible Cause Recommended Action

NO SOUND AT ALL

No sound, front-panel lights look

normal.

Verify that the selected format, mute status, and fader setting are

correct. If no formats produce sound, there may be a CP650 internal

problem. Call your local service engineer.

No sound, front panel is dark,

bypass power button is not glowing

red.

No power to CP650. See if the AC mains panel circuit breaker feeding the CP650 is tripped.

Verify that all power connectors are fully inserted into their sockets.

Press the front-panel

bypass power button. If the CP650 still does not

come on, call your service engineer.

No sound, and switching to Bypass

mode doesn’t restore sound.

No sound, front panel is dark,

bypass power button is illuminated,

and system is already in Bypass

mode.

Film sound reader on the projector.

Power amplifiers switched off.

Check that the film sound reader LED or exciter lamp is on. If not,

fade up background music and transfer the reel to the alternative

projector and continue the show until the LED/lamp or its power

supply can be replaced. Call your service engineer.

Check that the signal-present LEDs inside the setup control-panel

access door are flashing while the film is running. If not, call your

service engineer.

Check the power feed to the power amplifiers for a tripped circuit

breaker or fuse or an accidental disconnection.

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Dolby Laboratories CP650 User Manual Page 31