dCS 900E / 902E User Manual Manual for Software Versions 1.3x to 1.5x
dCS Ltd 12
th
June 2000
Manual part no: DOC0029021E1 Page 60 Document No: OS-MA-D0002-902.1E1
Contact dCS on + 44 1799 531 999 email to: more@dcsltd.co.uk
(inside the UK replace + 44 with 0) web site: www.dcsltd.co.uk
The Left and Right channels are swapped
• Check that the audio input cables are not reversed.
• Check that the channels are not swapped elsewhere in the system.
• If using SDIF-2, check that CH1 and CH2 outputs are connected correctly.
• dCS 902 only: In Dual AES mode, ensure that the AES 1 output is connected
to the input on the destination equipment for the Left channel data (probably
labelled AES 1, AES A or Left) and AES 2 output is connected to the input
on the destination equipment for the Right channel data (probably labelled
AES 2, AES B or Right). See the manual of the destination equipment for
information.
One output channel is low or absent -
• Check that all cables are connected correctly and not damaged. Damaged
cables are a VERY common source of malfunctions!
• Check that the balance is not offset elsewhere in the system.
• If the level trimmers on the rear panel have been adjusted, check that one
has not been set much lower than the other.
Clicks or crackles occur on the outputs -
• Check that all cables are connected correctly and not damaged.
• Check that the overload LED does not light on signal peaks.
Periodic clicks occur in the recording -
• If you are using a Master Clock, check that the ADC AND the recorder are
sync’ed to it.
The unit fails to slave to a Master Clock -
• Press the Master/Slave button to select Slave mode. If a suitable reference
is connected, the LED should light and the unit should lock after a few
seconds.
• Check that the Reference In or Clk In cable is connected correctly and not
damaged.
• Check that the Master Clock is switched on, set to the right sample rate and
does not require re-calibration.
• Connect a different piece of digital equipment to test the locking capability of
the unit. If the condition persists, contact your Distributor or dCS.
The Overload indicator will not go out -
• Remove any input and reference input. If the condition persists, contact your
dealer or dCS - the unit may be faulty.
External meter does not show overload, dCS 900 / 902 does.
• The dCS 900 / 902 monitors a number of internal points and data word
values in its calculation of overload. This may cause it to indicate an
overload while the final external data word may not show it - for example
with a very narrow but large spike, that the low pass decimation filter may
broaden out sufficiently that the output data does not saturate. It is likely that
if the dCS 900 / 902 says it is in overload, it is. You can choose to ignore it!
• Some digital meters are quite insensitive to overloads. Such equipment may
include a sensitivity setting, where an overload is only flagged when a
number of consecutive digital words saturate - typically 1, 2, 4 or 8
consecutive samples. There is some justification for this - single saturation
events are not always audible. The dCS 900 / 902 flags their presence - it is
up to the recording engineer to decide what to do about it.
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