Mackie FR1400 ユーザーズマニュアル

FR SERIES AMPLIFIERS

•  Is the signal source turned up? Make sure 

the signal level from the mixing console (or 
whatever device immediately precedes the 
amplifier) is high enough to produce sound in 
the amplifier. The SIG LEDs should be blinking 
to indicate that signal is present.

•  If the speakers are wired for BRIDGE mode, 

make sure the AMP MODE switch is set to 
BRIDGE.

•  If the amplifier has gotten extremely hot, the 

thermal protection circuit may have activated. 
Allow the amplifier to cool down and normal 
operation should resume.

•  Are there fuses in the speakers, or in-line fuses 

in the speaker wire? Check to see if they’re 
blown.

•  The power amplifier is clipping. The signal level 

is exceeding the limits of your system and you 
must reduce the level from your mixer or signal 
source.

•  Ensure that no equipment in the signal chain 

is being over driven. For example: input(s) or 
summing bus in the mixing console, equalizers 
etc.

•  Is the input connector plugged completely 

into the jack? Check the speaker connections 
and verify that all connections are tight and 
that there are no stray strands of wire shorting 
across the speaker terminals.

•  If possible, listen to the signal source with 

headphones plugged into the console. If it 
sounds bad there, the problem is not in the 
amplifier.

•  Loudspeakers not working properly.

•  Incorrect EQ settings in the electronic equip-

ment. Ensure all EQ settings and filters on the 
mixing console or preamplifier and on other 
equipment are set for normal operation. Ensure 
level controls on electronic crossovers and as-
sociated amplifiers are correctly set and that all 
cables and connections for such equipment are 
connected and working properly.

•  Loudspeaker not working properly. Swap with a 

good one.

•  Is the LED next to the POWER switch illumi-

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

•  The fuses inside the amplifier may have blown. 

These are not a user-serviceable. See next page 
about service.

Details concerning Warranty Service are spelled out 

in the Warranty section on page 19.

If you think your amplifier has a problem, please 

do everything you can to confirm it before calling for 
service. Doing so might save you from the deprivation of 
your amplifier.

These may sound obvious to you, but here are some 

things you can check. Read on:

•  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).

•  Make sure the front panel POWER switch is in 

the ON position.

•  Has the BREAKER switch popped?
•  Is anything 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 nothing is illuminated, and you are certain 

that the AC outlet is live, it will be necessary to 
have your amplifier serviced. There are no user 
serviceable parts inside. Refer to “Repair” on the 
next page to find out how to proceed.

•  Loudspeaker cables or connectors are not wired 

correctly or they are faulty. Check all cabling, 
referring to these instructions for the correct 
connections. The best way to check a suspect 
cable is to swap it with a known good cable. 
Read the loudspeaker’s input panel to verify 
correct cable connections.

•  Loudspeaker is not working. Connect the 

loudspeaker cable to a known good loudspeaker 
leaving all equipment set to the same levels. 
If the problem disappears, the loudspeaker is 
probably not working correctly.

•  Are the channel Level controls turned up? 

Slowly turn them up and see if you hear any-
thing.