24
1642VLZ4
164
2VLZ4
Appendix A: Service Information
Warranty Service
If you think your 1642VLZ4 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
• Are the channels assigned to the correct mix
(1-2, 3-4, L-R )?
• Is the fader up?
• Try unplugging any insert devices from the
insert [4] jacks.
• Try the same source signal in another channel,
set up exactly like the suspect channel.
Bad Output
• Is the level control (if any) turned up?
• If you’re listening to the CR outs [9] or phones
[10] outputs, has a source selection been
made?
• If it’s one of the main outs [14], try
unplugging its companion. For example,
if it’s the 1/4" output, unplug the RCA output.
If the problem goes away, it’s not the mixer.
• If it’s a stereo pair, try switching them around.
For example, if a left output is presumed dead,
switch the left and right cords, at the mixer
end. If the left is still dead, it’s not the mixer.
• Unplug everthing from the main insert [13].
Noise
• Turn the channel faders and stereo return
knobs down, 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.
Power
• Unplug the power cord and check the fuse.
Repair
For warranty service, refer to the warranty
information on page 31.
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 1642VLZ4 living
outside the United States can be obtained 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, 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.
Appendix B: Connections
Balanced XLR Input Connector
The 1642VLZ4 mixer has 10 female XLR inputs.
Be sure the cables are wired per AES (Audio
Engineering Society) standards:
Balanced XLR Input Connector
Pin 1 – Shield (Ground)
Pin 2 – Positive (+ or hot)
Pin 3 – Negative (– or cold)
2
3
1
SHIELD
COLD
HOT
SHIELD
COLD
HOT
3
2
1
Balanced XLR Input Connector
