Service Bulletin
Title:
Bulletin #:
DSP-3 Product Troubleshooting Guide
DSP0002
Issue Date:
July 18, 2001
Models Affected: DSP-3
Production Range: all
Bulletin Revision:
A
Description:
This bulletin is designed to solve problems that may be encountered while setting up the DSP-3 for the first time or creating a
configuration for the first time. It can also be used to determine whether or not the DSP-3 needs to be serviced. This bulletin is
separated into a Hardware Troubleshooting Guide and a Software Troubleshooting Guide. Hardware consists of the DSP-3 unit and
DSP-3 accessories. DSP-3 accessories include the DPX-1 external power supply, the DPX-2 DataPort cable and the DPX-4 mounting
bracket. The software is Signal Manager.
This troubleshooting guide does not address all possible problems that can arise when using the DSP-3 but does include most
common problems.
Units Affected:
This bulletin applies to all DSP-3s. The Signal Manager software is subject to change without notice and changes may affect the
Software Troubleshooting Guide.
Symptoms:
Symptoms are described on the following pages in the form of questions on a flow chart.
Instructions:
Determine whether the problem is hardware related or software related. Select the appropriate troubleshooting guide from the
following pages. If the problem cannot be classified, start with the Hardware Troubleshooting Guide. Begin at the block labeled
START and answer the yes or no questions outlined by diamonds. Follow the arrows according to the yes or no answer until a
solution is found.
Tools and materials required:
• Multimeter (optional)
DSP0002
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DSP-3 Signal Manager Software Support Troubleshooting Guide
Note: See the QSC Audio web site for DSP-3 software/firmware releases and
documentation of known issues:
START
See DSP-3
Does DSP-3
have power?
Hardware Support
Troubleshooting
Guide.
No
Are the input
phoenix connectors
oriented correctly (+,
- and gnd)
Is there a problem
with a specific
configuration?
Does DSP-3
pass audio?
No
No
Yes
Yes
Yes
Does DSP-3 go
online?
No
Yes
No
Is there a
’disconnected
wires’ error?
Yes
Plug in
phoenix
connectors
correctly or
rewire
according
to front
label.
Yes
Is there a problem
updating firmware?
No
Does DSP-3 go off-
line periodically?
Yes
Is there a harsh
(distortion) sound
coming from the
speakers?
Try deleting all
wires and redrawing
or select the objects
one channel at a
time and use auto
wire. Also look for
stray objects on
other areas of the
workspace.
Yes
No
No
Yes
The default
location for the
firmware file is C:\
Program Files\
QSC Audio\Signal
Manager\ and it
should be a .efd
file. The naming
convention is
Is this sound
caused by the DSP-3?
Bypass DSP-3; does
noise
Failed
No
Can firmware
file be found?
No
No
disappear?
d3fv0410.efd
where 0410 refers
to firmware
Another
Yes
component in the
system is causing
the noise.
Yes
version 4.1.0.
E-mail configuration file (*.cfg)
to QSC ([email protected])
for further troubleshooting. The
default path for configuration
files is, C:\Program Files\QSC
Audio\Signal Manager\Venues.
Is there a filter
block in the
configuration?
A ’Failed to read DSP
ID’ error is usually fatal.
Try disconnecting and
reconnecting power to
the DSP-3. Otherwise,
return DSP-3 to QSC
for repair or use
No
Yes
software that matches
version of firmware
already installed. See
all software/firmware
releases.
With some filter types, most notably high-
pass filter with 12dB/octave or greater
slope, it is possible to drive the DSP filter
into forced overflow oscillations when the
input to the filter is too large. This is a
normal characteristic of certain DSP filters
and is not a bug or defect. Reduce the gain
at the input of the filter object and
compensate with gain following the filter
object.
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Contact information
If you need any further information regarding this service procedure, please contact QSC Technical Services at the addresses or
numbers below. You can also order CM16 parts; to expedite processing please use the correct part number when ordering.
Telephone:
1-800-772-2834 (within USA only)
+1 714-957-7150
Fax:
+1 714-754-6173
E-mail:
Web Site:
Postal and parcel address:
QSC Audio Products, Inc.
Technical Services Group
1665 MacArthur Blvd.
Costa Mesa, CA 92626 USA
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DSP0002
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