Yamaha DX21 - Manual (Page 53)

FCC CERTIFICATION (USA)
While the following statements are provided to comply
with FCC Regulations in the United States, the corrective
measures listed below are applicable worldwide.
This series of Yamaha combo equiptment uses fre-
quencies that appear in the radio frequency range and
if installed in the immediate proximity of some types of
audio or video devices (within three meters), interference
may occur.
This series of Yamaha combo equipment has been
type tested and found the comply with the specifications
set for a class B computing device in accordance with
those specifications listed in subpart J of part 15 of the
FCC rules. Those rules are designed to provide a reason-
able measure of protection against such interference.
However, this does not guarantee that interference will
not occur. If your combo equipment should be suspected
of causing interference with other electronic devices,
verification can be made by turning your combo equipt-
ment off and on. If the interference continues when
your equipment is off, the equipment is not the source
of interference. If your equipment does appear to be
the source of the interference, you should try to correct
the situation by using one or more of the following
measures:
Relocate either the equipment or the electronic device
that is being affected by the interference.
Utilize power for the combo equipment and the
device being affected that are on different branch
(circuit breaker of fuse) circuits, of install AC line filters.
In the case or radio or TV interference, relocate the
antenna or, if the antenna lead-in is 300 ohm ribbon
lead, change the lead-in to co-axial type cable.
If these corrective measures do not produce satis-
factory results, please contact your authorized Yamaha
combo equipment dealer for suggestions and/or corrective
measures. If you can not locate a authorized Yamaha
combo equipment dealer in your general area contact
the Combo Service Departments, Yamaha International,
6600 Orangethorpe Ave., Buena Park, CA 90620, USA.
If for any reason, you should need additional infor-
mation relating to radio or TV interference, you may
find a booklet prepared by the Federal Communications
Commission helpful; “How to Identify and Resolve
Radio-W Interference Problems”. This booklet is
available from the U.S. Government Printing Office,
Washington D.C.
20402-Stock No. 004-000-00345-4.
YAMAHA
NIPPON GAKKI CO., LTD. HAMAMATSU, JAPAN
OMD-127-1 85 05 2.0 CR Printed in Japan