Mackie MR8MK2 User Manual download pdf (Page 9)

Owner’s Manual

Appendix A: Service Information

No Sound

• Is the power indicator [8] on the front panel

illuminated? If not, refer to “No Power” above.

• Is the input level [2] control turned up?

• Is the signal source turned up? Make sure the signal level

from the mixing console (or whatever device

immediately precedes the studio monitor) is high

enough to produce sound.

• 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 monitor end. If the problem

switches sides, it’s not the monitor. It could be a bad

cable, or no signal from the mixer.

Bad Sound

•

Is the input connector plugged completely into the jack?

If using a

⁄4" plug, make sure it is plugged all the way in.

• Is it loud and distorted? Reduce the signal level at the

mixer.

• If possible, listen to the signal source with headphones

plugged into the preamp stage. If it sounds bad there,

it’s not the monitor.

• Too much bass or not enough bass? Move around the

room and see if the bass response changes. It’s possible

your listening position coincides with a room mode

where the low frequencies either become exaggerated

or nulled. If so, try moving the monitors to a different

position, or moving your listening position.

Noise/Hum/Buzz

•

Check the signal cable between the mixer and the

monitor. Make sure all connections are secure. These

problems usually produce crackling noises, hum, or buzz.

•

If connecting an unbalanced output to the MR8mk2

balanced input, make sure the shield is connected to the

unbalanced ground of the source and to pins 1 and 3 of

the XLR.

• If a CATV cable is connected to the system, try

disconnecting it. If the hum goes away, call your cable

carrier to check for proper grounding of the cable.

• Make sure the signal cable is not routed near AC cables,

power transformers, or other EMI sources (including

wall warts and line lumps!). These sources usually

produce hum.

• Is there a light dimmer or other triac-based device on

the same AC circuit as the monitor? Dimmers cause

buzzing noises. Use an AC line ﬁlter or plug the monitor

into a different AC circuit.

• Excessive hiss is an indication of an incorrect gain

setting somewhere before the speaker.

• If possible, listen to the signal source with headphones

plugged in. If it sounds noisy there, it’s not the monitor.

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 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 [6] 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 [5] switch on the rear panel in the ON

position?

• Is the power indicator [8] on the front panel

illuminated? If not, make sure the AC outlet is live.

If so, refer to “No Sound” below.

• If the power indicator is not illuminated, and you are

certain that the AC outlet is live, it is possible the fuse

has blown.

To remove and replace the fuse:

1. Disconnect the power cord from the IEC socket.

2. Remove the fuse drawer by prying it open with a

small screwdriver. It will slide all the way out.

FUSE

3. Remove the fuse and replace it with an

equivalent-type fuse.

115 VAC unit: 1.6 amp slo-blo (T 1.6 AL/250V)

230 VAC unit: 800 milliamp slo-blo (T 800 mAL/250V)

4. Replace the fuse drawer by pushing it all the way

back into the IEC socket.

If two fuses blow in a row, then something is very wrong.

See the “Repair” section on the next page to ﬁnd out

how to proceed.

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Mackie MR8MK2 User Manual Page 9

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