Specifications

10-5
three LEDs function as a signal meter. If the Cat. No. 681 LEDs are flashing but
these are not, then the Cat. No. 681 is defective, or the Cat. No. 222 SR/A is
defective.
EXCEPTION:
If you have a Cat. No. 668 Studio NR daughter board, the Lt and Rt signals are routed
through the Cat. No. 300 modules rather than the Cat. No. 222 SR/A module. The Cat. No. 300s have no
level meters so no signal presence indicators are available in this configuration.
Next in the signal path are the LEDs on the Cat. No. 675A card located nine slots
from the right hand side of the unit (J12). This card functions as the surround
decoder. The top two LEDs indicate level in the Lt and Rt channels; the bottom
two indicate analog-to-digital converter overload in the same two channels. If
LEDs are flashing on the Cat. No. 222 SR/A but not here, then the Cat. No. 681
card, or this Cat. No. 675 is faulty.
Next in the signal path for all formats are the LEDs on the Cat. No. 675A card,
located seven slots from the right hand side of the unit (J14). The top six LEDs
indicate signals are present in the respective channels. This card functions as the
equalizer card. The Cat. No. 675A, as mentioned earlier shows lights, but if this
card does not, one of the two Cat. No. 675A cards discussed is defective.
The last point 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
main fader is turned down too far, the system is muted, or the Cat. No. 662
Digital-to-analog converter card or this card is faulty.
10.2.2 Digital Film Sound Signal Path LEDs
All the LEDs in the analog section described above should be on as described
above, since the print also contains an analog soundtrack.
The first LEDs in the digital signal path are the 16 green LEDs on each of the two
Cat. No. 671 cards located in the 4th and 5th slots from the right hand side of the
unit (J16,17). These should all be on nearly all the time when playing a good quality
film print with digital sound track.
Note that a steady red light showing on either of these cards indicates that the card
is not working. Pushing the digital sub-system reset button located at the bottom of
the Cat. No. 673 card (third slot from the right hand side of the unit, J18) will
frequently cure this problem.
WARNING:
Pushing digital reset will cause the CP500 to revert to analog sound until the reset
process is complete. This will produce a sound change depending on the actual program. For the least
disturbance to the audience, digital reset can be performed once or twice during a show