Appendix A: Service Information; Troubleshooting - Mackie 402VLZ4 Owner's Manual

Appendix A: Service Information

If you think your 402VLZ4 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.720trees.com)
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 mixer away.

Troubleshooting

Bad Channel
• Is the gain set correctly?
• Is the level knob turned up?
• Is the instrument switch set correctly?
(Channels 1–2 only).
• Try the same source signal in another
channel, set up exactly like the
suspect channel.
• Check that the stereo pan switch is
set correctly.
• Check the EQ and the low-cut switch.
Bad Output
• Is the associated level knob (if any)
turned up?
• If it's a left main out, try unplugging
the RCA left tape output. If the
problem goes away, its not the mixer.
• If a left speaker is presumed dead,
switch the left and right cords, at the
mixer's main outs. If the left speaker
is still not working, it's not the mixer.
• Visit www.720trees.com and click 'Contact Tech Support' to find: FAQs, manuals,
addendums, and other documents.
• Email us at: techmail@loudtechinc.com.
• Telephone 1-800-898-3211 to speak with one of our splendid technical support
representatives (Monday-Friday, during normal business hours, Pacific Time).
18
402VLZ4
Noise
• Turn the channel level knobs down,
Power
• The power LED on the mixer should
Repair
For warranty service, refer to the warranty
information on page 23.
Non-warranty service is available
at a factory-authorized service center.
To locate the nearest service center, visit
www.720trees.com, click "Contact Tech
Support" and select "Locate a Service Center
or Distributor" [3]. Service for a 402VLZ4
living outside the United States may be ob-
tained through local dealers or distributors.
If you do not have access to our website,
you can call our 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.
Need help with your mixer?
one by one. If the sound disappears,
it's either that channel or whatever
is plugged into it, so unplug whatever
that is. If the noise disappears, it's
from your whatever.
come on when the power switch is on.
Check that the power connection to
the mixer is plugged in.