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13. TROUBLESHOOTING
Your M&K Sound subwoofer amplifier provides high reliability and, in the rare event service is
ever required, easy modular replacement of parts. This section of the manual will help you to
solve or diagnose most problems that can occur with your subwoofer. In the event that a fuse
blows,
ALWAYS replace it with a fuse of the correct value to avoid malfunction of the unit or even a fire
hazard. Use of an incorrect fuse value will void your warranty.
A.
If your subwoofer has no output.
1. Make sure that the subwoofer is plugged into an AC outlet that you know is active and that the
power cord is securely plugged into the back of the subwoofer.
2. Make sure that the “POWER” switch is set to the “AUTO” or “ON” position. If you hear no
output with the switch set to “AUTO”, move the switch to the “ON” position.
3. Check the “BASS LEVEL” control and make sure that it is set above the “MIN” position. Rotate
it clockwise, if it is set to the “MIN” position.
4. Check the Power ON LED on the subwoofer’s back panel. If the LED is not lit (usually green),
check the fuse. ALWAYS unplug he subwoofer before changing the fuse. If the element inside the
fuse is broken, replace the fuse with a new one of the same value. If the new fuse blows
immediately, contact your M&K Sound dealer.
5. If the Power LED is lit, but you still hear no sound, try this test: Disconnect the phono
interconnect cable from the back of the receiver or processor. Touch the tip of the connector. If
you hear sound coming from the subwoofer when you touch the connector, the subwoofer is
working. You need to look elsewhere in your system to solve the problem.
6. Make sure that all the cables in your system are OK. Double check all your connections. If
necessary, replace any defective cables.
B.
After operating the subwoofer at high volume levels for a long time, the
subwoofer cuts out or stops working or becomes intermittent:
1. Your subwoofer has a protection circuit that protects it from overheating. After hours of
continuous operation at extremely high volume levels, this circuit may shut off the power to the
subwoofer. When it activates, the sound may switch in and out rapidly, with a fluttering sound. If
this happens, unplug the unit and let it sit for at least half an hour. After that time, plug it back in. It
should operate normally. If you find this happens frequently, contact your M&K Sound dealer.
C
.
If the mid-bass range the area of transition between your subwoofer and
satellite speakers - sounds weak:
1. Refer to the section on phase testing discussed earlier in this manual. Try reversing the phase
switch from plus (+) to minus (-) (or vice versa.)
