Mackie 408S Owner's Manual download pdf (Page 27)

APPENDIX A: Service Info

• Is the channel’s

VOLUME

control and

the

MAIN MASTER

control properly set?

Refer to the “Level Setting Procedure” on

page 6.

• Is there something plugged into the

channel’s

INSERT

jack? Plugging into the

INSERT

jack breaks the signal path for

the channel. Try unplugging any

INSERT

devices. If that fixes the problem, make

sure you’re using a properly wired send/

return cable (see “Making the Connec-

tions” on page 21). Make sure the

volume (gain) controls on the external

processor connected to the

INSERT

jack

are properly set.

• Is there something plugged into the

POWER AMP IN

jacks? Plugging into the

POWER AMP IN

jacks breaks the signal

path between the mixer and the ampli-

fier. However, the signal source you have

plugged into the

POWER AMP IN

jacks

should be heard over the speakers

connected to the

SPEAKER OUT

jacks.

• Do you have any external equalizers,

compressors or processors connected

between the

MIXER OUT

and

POWER

AMP IN

jacks? If so, make sure they are

working correctly.

• Are there fuses in the speaker or in-line

fuses in the speaker wire? Check ’em to

see if they’re blown.

• Are the speakers working properly? If

you have another amplifier that you

know works, plug the speakers into it to

make sure they work.

One side is way louder than the other!

For the 408S and 808S:

• Do the

LEVEL

meters read the same on

both sides? If not, the

PAN

control on

the signal source’s channel strip may be

turned too far to one side. If you’re using

a stereo signal source, it may be deliver-

ing an out-of-balance stereo signal.

• Try swapping sides: Turn off the powered

mixer, swap the speaker cables at the

SPEAKER OUT

jacks, turn the mixer

back on. If the same side is still louder,

the problem is with your speakers or

speaker cabling. If the other side is

louder now, the problem is with the

mixer, the amp, or the signal source.

Warranty Service

If you think your powered mixer has a prob-

lem, please do everything you can to confirm it

before calling for service, including reading

through the following Troubleshooting section.

Of all Mackie products returned for service

(which is hardly any at all), many are coded

“CND” — Could Not Duplicate, which usually

means the problem lay somewhere else in the

system. Here are some things you can check:

Troubleshooting

No power!

• Our favorite question: Is it plugged in?

Make sure the AC outlet is live (check

with a tester or lamp).

• Our next favorite question: Is the

POWER

switch on? If not, try turning it on.

• Is the green

POWER

light on the front

panel illuminated? If not, make sure the

AC outlet is live. If so, refer to “No

sound” below.

• The AC line fuse inside the mixer is

blown. This is not a user-serviceable

part. Refer to “Repair” on page 28 to find

out how to proceed.

No sound!

• Are the

INPUT LEVEL SET

controls

turned all the way down? Follow the

procedures in the “Quick Start” section

on page 6 to verify that all the level and

volume controls are properly adjusted.

• Is the signal source working (and

making union scale)? If it’s a micro-

phone, make sure the mic cable is in

good repair and securely connected at

both ends. If it’s a condenser micro-

phone, make sure the

PHANTOM

POWER

switch is turned on. If it’s an

instrument, again make sure the con-

necting cables are in good repair and

securely connected at both ends. Make

sure the output volume (gain) control

for the instrument is turned up suffi-

ciently to drive the inputs of the mixer.

You should be able to see the

INPUT

LEVEL SET

LED blink when you turn up

the

INPUT LEVEL SET

control.

If you’re monitoring the

TAPE IN

, make

sure the tape deck’s Tape/Source switch

is set to “Tape,” and make sure the

TAPE

IN LEVEL

control on the powered mixer

is turned up to unity (center position).

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Mackie 408S Owner's Manual Page 27

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