Appendix A: Service Information - Mackie ProDX4 Owner's Manual

Appendix A: Service Information

If you think your ProDX has a problem, please
check out the following troubleshooting tips and do
your best to confirm the problem. Visit the Support
section of our website (www.mackie.com/support)
where you will find lots of useful information such as
FAQs and other documentation. You may find the answer
to the problem without having to send your ProDX away.
Troubleshooting
No power
• Our favorite question: Is it plugged in? Make sure
the AC outlet is live [check with a tester or lamp].
• Our next favorite question: Is the power switch
on? If not, try turning it on.
• The internal AC line fuse may be blown. This is
not a user serviceable part. If you suspect the
AC line fuse is blown, please see the "Repair"
section next.
No sound
• Is the input level control for the input source
turned all the way down? Verify that all the level
controls in the system are properly adjusted.
Look at the level meter to ensure that the
ProDX is receiving a signal.
• Is the signal source working? Make sure the
connecting cables are in good repair and securely
connected at both ends. Make sure the output
level control of the source is turned up sufficiently.
• Make sure the source(s) are not turned off
or muted. If you find something like this, make
sure the level is turned down before disengaging
the offending switch.
Poor sound
• Is it loud and distorted? Make sure that you're not
overdriving a stage in the signal chain. Verify that
all level controls are set properly.
• Is the input connector plugged completely into
the jack? Be sure all connections are secure.
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ProDX4 • ProDX8 Wireless Digital Mixers
Noise
• Make sure all connections to the ProDX are
good and sound.
• Make sure none of the signal cables are routed
near AC cables, power transformers, or other
EMI-inducing devices.
• Is there a light dimmer or other SCR-based device
on the same AC circuit as the ProDX? Use an AC
line filter or plug the ProDX into a different
AC circuit.
Hum
• Try disconnecting the cable connected to
the main input jack. If the noise disappears,
it could be a "ground loop," rather than a
problem with the ProDX. Try some of the
following troubleshooting ideas:
• Use balanced connections throughout your system
for the best noise rejection.
• Whenever possible, plug all the audio equipment's
line cords into outlets which share a common
ground. The distance between the outlets and the
common ground should be as short as possible.
Bluetooth Issues
• Please call Technical Support if you are having
Bluetooth connection issues: 1-800-898-3211
Repair
For warranty service, refer to the warranty
information on page 18.
Non-warranty service for ProDX is available at
a factory-authorized service center. To locate the
nearest service center, visit www.mackie.com, click
"Support" and select "Locate a Service Center."
Service for a ProDX living outside the United States
can be obtained through local dealers or distributors.
If you do not have access to our website, you may
call the Tech Support department at 1-800-898-3211,
Monday-Friday, during normal business hours, Pacific
Time, to explain the problem. Tech Support will tell
you where the nearest factory-authorized service center
is located in your area.