DCS 992 User Manual page 67

dCS 992 User Manual
dCS Ltd
The main display blanks out a few seconds after pressing a button
The Remote Control program freezes up periodically
The sample rate is more than 1ppm out
The Test Generator produces the wrong tone frequencies
I hear periodic clicks from the monitoring DAC
The system locks but the DAC outputs full scale noise
Manual part no: DOC063992 iss 2A1
Contact on + 44 1799 531 999
dCS
(inside the UK replace + 44 with 0)
•
Access the Menu and set the
• Access the Menu and ensure the
•
If the Calibration
months, it is in need of re-calibration. There is no real-time clock inside the
dCS 992, so it can log how long it has been powered for but does not know
how old it is. Crystals age slowly with time, as well as use.
•
If you have just changed the sample rate or switched the unit on, wait at
least 30 minutes for the crystal oscillator to stabilise and check again.
•
Access the Menu and, if necessary, set the
again.
•
Check that the Master
External Sync connector.
•
If the sample rate is more than 10ppm out of calibration after running
undisturbed for 30 minutes, the unit may be faulty – contact dCS. Crystals
may be damaged if the unit is subjected to a heavy blow or dropped on a
hard surface.
•
Please ensure you are checking the accuracy against a reliable source,
such as a GPS receiver.
•
If the unit is very hot or very cold, the calibration will not be effective. Access
the Menu and check the
•
•
If the Output Format
AES and use the AES/EBU outputs only.
•
This may be caused by slaving the DAC to the Master Clock but not the
equipment feeding the DAC.
• The use of damaged or unscreened cables can cause this fault.
•
This may be caused by having one item in the system set to a different
sample rate, rather than slaved to the Master Clock.
•
If there is a Sample Rate Converter in the system which is set to change the
sample rate, you cannot directly synchronise equipment feeding the SRC,
the SRC itself and the DAC connected to the SRC by slaving everything to
the dCS 992. Slave the DAC to the SRC instead.
7-Seg option to On.
RS out option is Off.
x
indicator is lit or the unit has not been calibrated for 12
LED is lit. If not, disconnect any cables from the
Heat
option.
is set to 2, ensure your DAC is set to receive Dual
Page 67
Manual for Software Version 2.0x
January 2001
Offst
option to zero then check
file 063992ma2a1.pdf available from website
email to: more@dcsltd.co.uk
web site: www.dcsltd.co.uk