KRK Systems 8S Guide D'utilisation page 8

TROUBLESHOOTING
If there is no power, check to see if...

Check to see if the power cord is plugged into both the IEC socket on the rear panel of the active speaker and into the AC mains. Verify that the AC mains are active by
using an approved AC tester or simply connect a lamp with working light bulb. In some cases, the AC mains may be controlled by a light switch or power strip
suppressor that may not be in the 'on' position.

Verify that the power switch on the active speaker is in the 'on' position.

Check to see if the power light is illuminated. The power light can often to be found on the front panel of the monitors and the rear panel of the subwoofers. If the
power light is not illuminated, turn the power switch OFF and check the A/C mains fuse(s). The fuse is located directly below the power receptacle. Please see the
user guide that came with your monitor for more information.
NEVER USE A LARGER AMPERAGE FUSE THAN IS SPECIFIED!
After the fuse has been checked and replaced, turn the power switch back on. The power light should illuminate.

Check to see if a fuse change was needed. If you power the monitor back up and the fuse blows again, the monitor needs to be returned to the dealer or distributor
where you purchased it or to KRK for servicing.
If you can't hear certain sounds...

Repeat steps in the previous troubleshooting section above before continuing to the next steps.

Check to see if all other audio devices using the same AC outlet are still operating.

Check to see if the audio source cable is plugged into both the source output and the monitor input.

Check to see if the Volume knob is turned up fully clockwise.

Check to see if the signal source (E.g. mixing console, work station, CD player, etc.) is turned up to a level that can properly send a signal to the monitors.

Check to see if the audio source is in mono or stereo, or information in the mix may also be panned differently which will result in differing cancellation. Audio heard
in stereo and not heard in mono may be a result of phase cancellation due to long delays between left and right channels or polarity inversion. Avoid polarity
inversion by using matching cables and use one type of input connection only. Do not use an XLR/TRS balanced input on one monitor and an RCA unbalanced input
on the second monitor.

Check to see if one of the monitors is working. 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.

If the monitor is still not responding, it should be returned to the dealer where you purchased it or to KRK for servicing.
If the subwoofer suddenly stops working...

Turn the subwoofer level down or off.

Repeat steps in the troubleshooting sections above before continuing to the next steps.

Carefully check to see if the amplifier's back plate is hot! If the monitor has been running at highest power output for an extended period of time, it could be that the
unit has become overheated and the protection circuitry has shut the system down momentarily. The monitor provides maximum circuitry protection against AC
power surges, amplifier overdrive, and overheating of the amplifiers. Turn the monitor off then wait 30 minutes to allow the back plate to cool down. Turn the
power switch back on.

Increase the volume to check for normal operation.

If the monitor is still not responding, it should be returned to the dealer where you purchased it or to KRK for servicing.