Appendix A: Service Information

d.4 Pro 4-channel DJ Production Console

Warranty Service

Details concerning Warranty Service are spelled out in the Warranty section on page 31.

If you think your d.4 Pro 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, documentation, and user forums. You may find the answer to the problem without having to send your d.4 Pro away.

Here are some 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 [17] and plugged all the way into the AC outlet.

•Make sure the AC outlet is live (check with a tester or lamp).

•Make sure the rear panel power switch [16] is in the on position (up).

•Are the EQ controls on the front panel illuminated? If not, make sure the AC outlet is live.

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

•If no LEDs are illuminated, and you are certain that the AC outlet is live, it will be necessary to have your d.4 Pro serviced. There are no user serviceable parts inside. Refer to “Repair” on the next page to find out how to proceed.

•Is the correct input chosen with the source [30] switch, and is its program level [29] turned up far enough?

•Try the same source signal in another channel, set up exactly like the suspect channel.

•Make sure the aux knob [35] is turned to fully dry if you are not using an external processor.

Bad Output

•Is the associated level control (if any) turned up?

•If it’s one of the main outputs, try unplugging the others. For example, if it’s the left XLR main out [12], unplug the left RCA main out [14]. If the problem goes away, it’s not the mixer.

•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 level [29] control 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 d.4 Pro causing the problem.

•If you are using a turntable with a phono-level output, and the sound is low and distorted, check that the line/phono [5] switch is set to phono. Note that the phono section requires your cartridge to be a moving magnet type. It may be too low to amplify the low levels of a moving coil type.

Bad Channel

•Check the assign switch [37] is not in the off posi- tion.

•Check the channel’s program fader [38] is not fully down.

•Are that channel’s EQ controls all turned down?

•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 program meter [39] LEDs.

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d.4 Pro DJ Production Console

Noise/Hum

•Turn down the aux return [41] knob. If the noise disappears, it’s coming from whatever is plugged into the aux returns [9].

•Check that your turntable’s audio ground wire is connected to the phono ground [6] terminals.

•Turn down each channel, one by one. If the noise disappears, it’s coming from whatever is plugged into that channel. Check your whatever.

•Check the signal cables between the input sources and the d.4 Pro. Disconnect them one by one. When the noise goes away, you’ll know which input source is causing the problem.