MK Sound MX-700 - Hum Source Identification Method; AC Ground Loop Hum Mitigation; Unusual Sound with No Music; Fuse Replacement Procedure

page 15powered subwoofers
Subwoofer is the source of the hum. If you hear no hum or less hum, the problem is
probably coming from another component.
Hum can also be caused by AC ground loops. If the Subwoofer is plugged into a
separate AC outlet, try plugging it into the same outlet used for your amplifier or
receiver, or reverse the polarity of its AC plug. If these suggestions do not solve
your problems, contact your dealer or M&K.
7. If there is an unusual sound coming from the Subwoofer with no music playing:
Try removing the input cables as described in Step 5 above. If the noise disappears, it is coming
from another component. If it does not go away, contact your M&K dealer or the factory.
IF YOU NEED TO REPLACE THE EXTERNAL FUSE:
Disconnect supply cord before changing fuse. Replace fuse only with same type.
Remove the fuse cap. If the fuse cap has an arrow printed on it, push the cap in and turn it
counterclockwise. If the fuse cap has a slot in it, use a flat head screwdriver to turn it counterclockwise.
Look carefully at the fuse. If the wire filament inside the glass is broken, replace the fuse ONLY with
one of the identical size and value. Using a fuse of a larger value will void your warranty AND MAY
CREATE A FIRE HAZARD. Plug the Subwoofer back in. If it does not work, unplug it immediately,
and contact your dealer or M&K for service.
REPLACEMENT FUSE VALUES (units with U.S. standard fuses)
Replace only with same type 3AG-250 VAC SLO-BLO 1 1/4" x 1/4" fuse.
MODEL 110 v 220 v MODEL 110 v 220 v
MX-2000 6 amp 3 amp MX-300 6 amp 3 amp
MX-200 4 amp 2 amp MX-700 5 amp 2.5 amp
MX-145 2.5 amp 1.25 amp MX-125 Mk II 4 amp 2 amp
MX-100 4 amp 2 amp MX-105 / Mk II 2.5 amp 1.25 amp
MX-90 2 amp 1 amp MX-80 1.25 amp .75 amp
MX-70/MX-70B 2 amp 1 amp V-100 4 amp 2 amp
V-125 2 amp 1 amp V-90 1.25 amp .75 amp
V-75/V-75 Mk II 1.25 amp .75 amp V-3B 1.25 amp .75 amp
VX-4 1 amp .75 amp VX-7B/VX-7 Mk II 1 amp .75 amp
VX-100 2 amp 1 amp
REPLACEMENT FUSE VALUES (units with IEC 127-2/III standard fuses)
Replace only with same type IEC 127-2/III 5 X 20 mm timelag "T" fuse.
MODEL 220 v MODEL 220 v MODEL 220 v
MX-2000 2.5 A MX-300 2.5 A MX-200 1.6 A
MX-145 1 A MX-125 1.6 A MX-100 1.6 A
MX-105 / Mk II 1 A MX-90 800 ma MX-80 630 ma
MX-70/70B 800 ma V-100 1.6 A V-125 800 ma
V-90 630 ma V-75/V-75 Mk II 630 ma V-3B 630 ma
VX-4 630 ma VX-7/7B/Mk II 630 ma VX-100 800ma