Dolby Laboratories DP524 - Manual (Page 25)

SECTION 5
OPERATION
Once the DP524 is installed and operational, no user-intervention is required. In
normal operation, one of the Green LEDs will indicate the incoming sample rate
(32kHz , 44.1 kHz or 48 kHz); the signal presence indicators will also illuminate if
appropriate.
5.1 Front Panel Status Indicators
Fault
The Fault LED indicates power supply or processor/memory failure. Upon power-
up of the DP524, the internal processor performs a diagnostic check of all memory
locations and verifies that processor clock signals are active. Failure of any of these
tests is indicated by the illumination of this LED. Memory or processor failure
during operation will result in a similar display.
Test
The yellow Test LED indicates that the Test Tone Generator has been activated
(position 1 of rear panel DIP Switch S101 is up).
Mute
The red Mute LED indicates that the unit is not currently able to recover valid
audio. This may because the incoming data rate is outside the lock range of the
internal phase lock loop or because no valid data is being fed into the unit.
48k
The green 48k LED indicates that the unit is currently locked to the incoming data
stream and is recovering valid audio at 48 kHz sample rate.
44.1k
The green 44.1k LED indicates that the unit is currently locked to the incoming
data stream and is recovering valid audio at 44.1 kHz sample rate.
32k
The green 32k LED indicates that the unit is currently locked to the incoming data
stream and is recovering valid audio at 32 kHz sample rate.
Signal Presence A & B
These two green LEDs indicate that audio is present on the analog outputs at a
level greater than approximately-60dB Full Scale.
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