QSC Audio Stereo System DSP0002 User Guide

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  
1
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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  
wireserror?  
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  
IDerror 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.  
DSP0002  
3
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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  
4
DSP0002  
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