Appendix A: Service Information

Operation

Warranty Service

If you think your Mackie product 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 Mackie product away.

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 POWER LEDon the front panel illumi- nated? If not, make sure the AC outlet is live. If so, refer to “No Sound” below.

•Are all the lights out in your building? If so, contact your local power company to get power restored.

•If the POWER LED is not illuminated, and you are certain that the AC outlet is live, it will be necessary to have Big Knob serviced. There are no user serviceable parts inside. Refer to “Repair” at the end of this section to find out how to proceed.

No Sound

•Is the POWER LEDon the front panel illumi- nated? If not, refer to “No Power” above.

•Is the correct INPUT SOURCE SELECT button selected? Make sure the LED above the INPUT SOURCE SELECT button is lit.

•Is the signal source turned up? Make sure the signal level from the selected input source is high enough to light up some of the INPUT meter LEDs on Big Knob’s front panel.

•Make sure the trim control and level switch for the selected input are set correctly.

•If there is no sound in the PHONES or STUDIO outputs:

Make sure the PHONES/STUDIO OUTS

SOURCE button on the front panel is up (INPUT SOURCES selected).

Make sure the PHONES or STUDIO Level control is turned up.

Make sure the STUDIO OUTS ON/OFF button is ON.

•If there is no sound in the MONITOR OUTPUTS

:

Make sure the correct MONITOR SELECT button is pushed in and the trim control for the MONITOR OUTPUT is set correctly.

Make sure the cable connecting the MONITOR OUTPUT to the active speaker or power amplifier isn’t defective and the amplifier/speaker combination is working correctly.

Bad Sound

•Is the input connector plugged completely into the jack?

•Is it loud and distorted? Make sure the trim control and level switch for the selected 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 Big Knob causing the problem.

•Make sure the trim control for the MONITOR OUTPUT is set correctly and not overdriving the input stage of the active speaker or amplifier to which it is connected.

Noise/Hum

•If a turntable is connected to the PHONO inputs on Big Knob, make sure the ground wire from the turntable is connected to the GND terminal on Big Knob.

•If a turntable is not connected to the PHONO inputs, make sure the PHONO INPUT SOURCE SELECT button is not pushed in. Also make sure the RCA shorting plugs are connected to the PHONO inputs when not being used.

•Check the signal cables between the input sources and Big Knob. 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 equip- ment into the same AC circuit so they share a common ground.

Guide

Operation Guide

13