Appendix E: Service Information; Warranty Service; Troubleshooting - Mackie TT24 Quick Start Manual

Appendix E: Service Information

Warranty Service

Details concerning Warranty Service are spelled out
in Appendix E: Warranty Information.
If you think your TT24 has a problem, please do ev-
erything you can to confirm it before calling for service.
Doing so might save you from the deprivation of your
TT24 and the associated suffering.
These may sound obvious to you, but the following are
things you can check.

Troubleshooting

No Power
• Our favorite question: Is it plugged in?
• Make sure the power cord is securely seated in the
IEC socket and plugged all the way into the AC
outlet.
• Make sure the AC outlet is live (check with a tester
or lamp).
• Is the POWER switch on? Make sure the POWER
switch on the rear panel is in the ON position (up).
• Is the Touchscreen on the front panel illuminated?
If not, make sure the AC outlet is live.
• Are all the lights out in your building? If so, contact
your local power company to get power restored.
• If the Touchscreen is not illuminated, and you are
certain that the AC outlet is live, it will be neces-
sary to have your TT24 serviced. There are no user
serviceable parts inside. See Repair (below right)
to find out how to proceed.
Bad Channel
• Is the MUTE button pushed in?
• Is the input GAIN control for the channel
turned up?
• Is the fader turned up?
• Is the signal source turned up? Make sure the signal
level from the selected input source is high enough
to light up the Signal LED just above the channel's
V-Pot.
• Is the channel assigned to a Group? Make sure the
Group is assigned to the Left and Right MAINS
OUT.
• Is there something plugged into the CHANNEL
INSERT jack? Try unplugging any INSERT devices.
• Try the same source signal in another channel, set
up exactly like the suspect channel.
Bad Output
• Is the associated level control (if any) turned up?
• 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
problem stays on the left side, it's not the mixer.
Bad Sound
• Is the input connector plugged completely into
the jack?
• Is it loud and distorted? Make sure the input GAIN
control for the input is set correctly. Reduce the
signal level on the input source if possible.
• If possible, listen to the signal with headphones
plugged into the input source device. If it sounds
bad there, it's not the Onyx causing the problem.
Noise/Hum
• Turn down all the faders on the RETURNS bank. If
the noise disappears, it's coming from whatever is
plugged into the RETURNS (LINE Inputs or EFX
Returns).
• Turn down each channel, one by one. If the noise
disappears, it's coming from whatever is plugged
into that channel.
• Check the signal cables between the input sources
and the TT24. Disconnect them one by one. When
the noise goes away, you'll know which input source
is causing the problem.
• Sometimes it helps to plug all the audio equipment
into the same AC circuit so they share a common
ground.
Owner's Manual
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