KRK V4 - Manual (Page 8)

7
Troubleshooting
Problem: If there is no power, check to see if...
• The power cord is plugged into both the IEC socket on the rear panel of the unit and into the AC mains
• The AC mains voltage is matched to the operating voltage requirements (See Changing Voltage in the
Connecting the System section on page 3). If the AC mains voltage is higher than the V-8’s selected
voltage it is possible that the fuse needs to be replaced. (See Changing Fuses in the Connecting the
System section on page 3).
• The power light is illuminated on the front panel of the V-4. If not, turn the power switch OFF and check
the A/C mains fuse(s). NEVER USE A LARGER AMPERAGE FUSE THAN IS SPECIFIED! Turn the power switch
back on. The power light should illuminate.
• If a fuse change was needed and upon powering the monitor back up the fuse(s) blow again, the monitor
needs to be returned to the dealer you purchased it from or to KRK for servicing.
Problem: If you can't hear any sound...
• 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.
• Make sure that:
• The audio source cable is plugged into both the source output and the monitor input.
• The System Gain pot is turned up fully clockwise (+ 6 dB).
• 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.
• 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 that you purchased it from or to
KRK for servicing.
Problem: If the monitor suddenly stops working...
• Turn the monitor send 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 V-4 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 that you purchased it from or to
KRK for servicing.
Problem: The sound quality changes...
• Repeat steps in the previous troubleshooting section above before continuing to the next steps.
• Disconnect the signal cable at the input of the monitor. 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 or tweeter or both) is at fault. It's also
possible that the problem lies somewhere in the electronics.
• 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.
• 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.