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dCS 974 User Manual Manual for Software Version 1.0x
dCS Ltd May 2001
Manual part no: DOC1241121A1
Page 120
Document No: OS-MA-A0124-112.1A1
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
T
ROUBLESHOOTING
FAQs
The unit fails to lock to a source signal.
• Check that Audio Input Select is set to the correct input.
• Check that Input Sample Rate is either set to Auto or set to suit the
source device.
• Check that Sync Source is set correctly - try setting it to Audio Input.
• Check for damaged cables.
The unit locks but no signal is received.
• Display the Bit Activity Monitor to see if a signal is available at the unit. If
there is no signal into the unit, and Detect Silence is on, there will be no
signal out – even with Dither and Noise Shaping on.
• If the unit is locked to an external clock, check that Audio Input Select is
set to the correct input.
• If SDIF-2 is used, check that CH1 IN and CH2 IN (upper block) are both
connected.
The destination device fails to lock to the unit.
• Check that the unit is locked to a source.
• Check that Output Sample Rate and Output Mode suit the settings on
the destination device.
• Ensure the destination device is set to sync to the dCS 974 and not to a
Master Clock.
• Ensure the destination device is capable of locking to the selected Output
Sample Rate.
• Check for damaged cables.
The destination device locks but no signal or just noise is received.
• Display the Level Meters to ensure signal is present on the outputs.
• Check that the Test Generator is off by pressing the Status button.
• Ensure the destination device is set to sync to the dCS 974 and not to a
Master Clock.
The destination device connected to the AES or SPDIF outputs reports an error.
• Check that AES and SPDIF Messages are correctly set up.
• Check for damaged cables.
• Check that the destination device can receive the sample rate the dCS 974
is putting out, in the appropriate (1 wire, 2 wire, 4 wire) format.
Output audio quality is poor.
• Check that Output Wordlength is set correctly.
• If truncating from 24 bits, use Noise Shaping and/or Dither.
• Ensure the unit is locked to the source device or an external clock driving
the source device.
• Converting from a very low sampling rate to a high sampling rate cannot
give sparkling hi-fi performance, although it can improve things a bit (the
“upsampling” phenomenon). The dCS 974 can convert a 12 kS/s, 8 bit signal
up to 192 kS/s, 24 bit in real time but the linearity will be poor due to lack of
source information, the noise floor will be high and the audio bandwidth will
still be 5kHz (i.e. not much better than a telephone line).