KRK Systems 12sHO Guide D'utilisation page 20

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If one of the full range monitors is working then exchange the audio input cable from the non-
working monitor to the working unit. This will determine whether it's really the monitor, a faulty
cable, or some other glitch in the audio chain.
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If the unit is still not responding, it should be returned to the dealer that you purchased it from, or to
KRK, for servicing.
If the monitor suddenly stops working...
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Turn the unit's send down or off.
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Repeat the steps in the Troubleshooting sections above before continuing to the next steps.
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Carefully check to see if the amplifier's back plate is hot! If the unit has been running at highest
power output for an extended period of time, it could be that it has become overheated and the
protection circuitry has shut the system down momentarily. The unit provides maximum circuitry
protection against AC power surges, amplifier overdrive, and overheating of the amplifiers. Turn the
unit off then wait 30 minutes to allow the back plate to cool down. Turn the power switch back on.
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Increase the volume to check for normal operation.
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If the unit is still not responding, it should be returned to the dealer that you purchased it from, or to
KRK, for servicing.
The sound quality changes...
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Repeat the steps in the Troubleshooting section above before continuing to the next steps.
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Disconnect the signal cable at the unit's input. With power on, place your ear close to each driver
(tweeter/woofer) and listen for noise (i.e. a slight hiss or hum). If there's absolutely no sound
whatsoever, it could be that one or more of the drivers (woofer, tweeter or both) is at fault. It's also
possible that the problem lies somewhere in the electronics.
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Play some non-distorted source material at a low volume. Carefully cover the tweeter (to block the
sound) without touching the diaphragm. Is the woofer producing a clean sound? If there is not a clear
tonal quality, or any sound at all, then the woofer probably needs to be replaced.
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Cover the woofer so you can hear mostly the tweeter. Is the tweeter producing a clear sound? If there
is not a clear tonal quality, or any sound at all, then the tweeter probably needs to be replaced.
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Once you have a better idea of what may be at fault then call us and speak with someone in the
service department. They will help you determine the best solution to correct your unit. The service
department can be reached at 954-949-9600.
The monitor (or subwoofer) hisses, hums or makes other loud noises...
Here are some suggestions that will help you eliminate these undesirables from your system:
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Make sure that the power cord is plugged snugly into the IEC socket on the rear of the unit.
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Check the connections between the signal source and the unit. The sub and monitor's XLR and TRS
connectors are a completely balanced system. If you're connecting an unbalanced output to the
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