Mackie U.420 Manuale del Proprietario Scaricare il pdf (Pagina 20)

U.420d 4-Channel Mic/Line Mixer

If you think your U.420d has a problem, please check

out the following troubleshooting tips and do your best

toconrmtheproblem.Visitthesupportsectionofour

website(www.mackie.com/support)whereyouwillnd

lotsofusefulinformationsuchasFAQs,documentation,

anduserforums.Youmayndtheanswertotheprob-

lem without having to send your U.420d away.

These may sound obvious to you, but here are some

things you can check. Read on:

Troubleshooting

No Power

• Makesuretheexternalpowersupplyissecurely

seated in the DC input [8] 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LED[28]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 external power supply is working, it will be

necessary to have your mixer serviced. There are no

user serviceable parts inside. Refer to “Repair” on the

nextpagetondouthowtoproceed.

Bad Channel

• Checktheconnectionsfromyoursourcearemade

securely, and that the cords are in good condition.

• Checkthechannel’sprogramgain[12]or[20]are

set correctly.

• 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 the level set LEDs [10] when ad-

justed with the gain controls.

Appendix A: Service Information

• Ifyouareplayingaguitarorotherinstrumentlevel

source into channel 1, make sure you are using the

1/4" input, and that the instrument switch [11] is

engaged.

• Ifyouareplayingaguitarintochannel2,3,or4,

you need to use a DI box for the correct impedance

matchandhighfrequencydelity.

• Trythesamesourcesignalinanotherchannel,set

up exactly like the suspect channel.

• Onlyphono-levelsources(turntables)shouldbe

connected to the RCA phono inputs [3]. The phono

section requires your cartridge to be a moving-mag-

net type. It may be too low to amplify the low levels

of a moving-coil type.

• Ifthereisnophonooutput,checkthatthereis

nothing plugged into the channel’s line-level inputs.

The phono inputs are disconnected internally when

a 1/4" connector is plugged into the same channel.

• Onlyline-levelsourcesshouldbeconnectedtothe

line-level inputs [2] of channels 3 and 4.

• Ifpossible,listentothesignalwithheadphones

plugged into the input source device. If it sounds

bad there, it’s not the mixer causing the problem.

Bad Output

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

• 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.

Noise/Hum

• Checkthatyourturntable’saudiogroundwireis

connected to the ground terminals [4].

• 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 mixer. 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.

• Hungry?Trytheall-you-can-eatlunchtimebuffetat

the Bombay Palace in downtown Woodinville.

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Mackie U.420 Manuale del Proprietario Pagina 20

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Prodotti e manuali riguardandi Equipaggiamento supplementare per musica Mackie U.420