Dolby Laboratories CP500-300 Operations Instructions download pdf (Page 36)

4-8

Symptom Probable Cause Recommended Action

NO SOUND IN SOME

FORMATS

No analog film sound (Formats 01,04,

05). Front panel normal, but Dolby

Digital sound OK and non-sync OK.

The analog exciter lamp or power supply may have failed

or the wrong projector may be selected. Solar cell

connections may be loose or damaged. The Cat. No. 661

optical preamp may have failed.

If signal present LEDs on the Cat. No. 661 (J3) are not

flashing, verify exciter operation and solar cell connections

as described above. Substitute known good Cat. No. 661.

No Dolby Digital sound (Format 10).

Front panel normal, analog sound OK.

Digital exciter lamp/LED not working,

Digital subsystem, non-Dolby Digital print being played,

film not threaded correctly in reader, reader failure

Verify that the exciter lamp or LED in the digital reader is

on and that the print you are playing has Dolby Digital

information on it and is correctly threaded through the

digital reader. If the CP500 will still accept a Format 10

command, the DA20 subsystem is probably still working.

No sound on external six track input

(Format 11, 70mm, external DA20, or

other multi-channel sound sources)

Front panel normal.

Cat No. 685 card defective. Wrong format, external

device not receiving good data.

Check external device for audio output. Substitute known

good Cat. No. 685.

No sound in non-sync

Non-sync source not working, non-sync level pots too far

down (on Cat. No. 681 card), faulty Cat. No. 681. If non-

sync is a user format, is the input from Non-sync 1 or

Non-sync 2? Which channels are the signals being sent

to? Are those power amplifiers working?

Verify output of non-sync source. Determine from front

panel meters which channels the output is directed to and

verify that power amplifiers and speakers for those

channels are working. After checking the above, adjust

non-sync level pots on Cat. No. 681, turning both left and

right channels by equal amounts.

Red Bypass LED lit. Front panel dark.

There is sound.

System is in Bypass operation. Turn on the CP500 with the push switch at the lower right

hand corner behind the front door. Check that the power

cord to CP500 is securely plugged in to a working power

source. Check fuse behind plastic door on AC mains power

inlet module of CP500. Call service engineer if none of

these steps fixes the problem.

1 2 ... 31 32 33 34 35 36 37 38 39 40 41 ... 53 54

Comments to this Manuals

No comments

Dolby Laboratories CP500-300 Operations Instructions Page 36

Comments to this Manuals

Related products and manuals for Recording Equipment Dolby Laboratories CP500-300