Dolby Laboratories CP500 Specifications download pdf (Page 104)

10-6

If this does not correct the problem, you can reset the entire CP500 by pressing the

button located on the left hand end of the horizontal Cat. No. 684 board on the

bottom of card rack (J8,9).

WARNING:

Resetting the system will cause the CP500 to switch to Bypass until the system reset

process is complete. This will produce a considerable change in sound quality and you may not wish

to do this during a show.

The Cat. No. 673 contains a one-character alphanumeric display. This display

normally operates as an error rate indicator. Good Dolby Digital films should play

with error rates of "5" or below. If the error rate exceeds "8", then the display will

indicate "F" and the system will revert to analog playback until the data quality

improves. This card also contains two LEDs. The lower one flashes whenever an

uncorrectable block of digital data is processed; the upper one indicates a fault

condition on the Cat. No. 673 card. In normal operation, the lower LED should

rarely if ever flash, and the upper one will remain off.

The next LEDs in the digital sound path are on the Cat. No. 675A AC-3 Decoder

card, located two2 slots from the right hand side of the unit (J19). This card has

three columns of eight LEDs. The top four LEDs in each column indicate signals

present in the L, Ls, and C channels respectively. The bottom four LEDs in each

row indicate signals present in the R, Rs, and SW channels. In each group, the

bottom one is illuminated for signals of 40 dB below Dolby level or louder, the

middle two for signals very close to Dolby level, and the top one for signals 10 dB

above Dolby level and louder.

The next LEDs in the digital sound path are on the Cat. No. 675A Equalizer card,

located seven slots from the right hand side of the unit (J14). This card has eight

LEDs. The top six LEDs indicate signals present in the L, C, R, Ls, Rs, SW

channels (from the top LED). If the Cat. No. 671 discussed above shows lights but

this card does not, then the Cat. Nos. 673, 675, or 680 may be faulty, or this Cat.

No. 675A card is defective. These LEDs are also illuminated when playing

analog formats

The last card containing LEDs in the signal processing chain for all formats is the

Cat. No. 682 Output card located in the second slot from the left hand side of the

unit (J2). If all other LEDs mentioned above are flashing but LEDs on the card are

not, then the fader is turned down too far, or the system is muted, or the Cat. No.

662 Digital-to-Analog Converter card or this card is faulty. These LEDs are also

illuminated when playing analog formats.

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Dolby Laboratories CP500 Specifications Page 104