Kurzweil DMT interface, User Manual, Page: 33 / 44

33 User’s Guide
Troubleshooting
The great majority of errors in any digital audio system are caused by prob-
lems with digital synchronization, or clocks. The
DMTi
is designed to solve
these problems, but as in any complex system, a thorough understanding of
how these problems occur is necessary for you to get the
DMTi
to perform
correctly.
No sound at all
Besides the obvious problem of missing or defective cables, this may be caused
by a lack of proper clock signal to the
DMTi
. Make sure the Clock Select
switch is set to an input at which there is an actual signal: for example, if it is
set to
WDCLK and there is no signal present at the Word Clock In put, there
may be no audio output. Similarly, there must be signal present at the AES,
MDM, or KDS inputs if any of those are to be the sync master. To determine
whether this is the problem, set
Clock Select to one of the Int settings and
make sure that clock is getting to the device connected to the
DMTi
’s output.
If there is no sound coming from the
AES1
input, make sure the
Input Select
switch is set correctly.
Intermittent audio
This can be caused by clock problems (as above) or by a weak digital signal.
Cables that are too long or are of poor quality can cause the signal to
deteriorate or suffer interference. Keep cables as short as possible, especially if
you are using single-conductor coaxial S/PDIF cable. Coaxial cables designed
for analog audio are not very good for carrying digital signals—instead, use
cables designed for video.
If you are using an AES output to feed an AES/EBU device, make sure its
format switch is set to Pro , to ensure that the correct signal format is being
transmitted. Similarly, if you are feeding an S/PDIF device, make sure the
switch is set to
Cnsmr
. You may also need to use an attenuating adapter to
bring the signal level down (see Page 10).
Can’t record output
Some recording devices, such as certain DAT decks, may have trouble
receiving or locking to the
DMTi
’s output. They may not recognize the digital
audio signal, or not go into record at all.