Mackie TT24 Owner's Manual - Bad Output

65

Owner’s Manual

Owner’

s Manual

Appendix E: Service Information

•  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. 

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.