Yamaha DX7s Owner's Manual page 108

While the following statements are provided to comply
with FCC Regulations in the United States, the cor-
rective measures listed below are applicable world-
wide.
This series of Yamaha professional music equipment
uses frequencies 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 have been type tested and found
to comply with the specifications set for a class B
computing device in. accordance with those specifi-
cations listed in subpart J of part 15 of the FCC rules.
These rules are designed to provide a reasonable
measure of protection against such interference.
However, this does not guarantee that interference
will not occur. If your professional music equipment
should be suspected of causing interference with other
electronic devices, verification can be made by turning
your combo equipment 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:
DX7S OM
3/10/99 19C0170
FCC INFORMATION
Relocate either the equipment or the electronic device
that is being affected by the interference. Utilize power
outlets for the professional music equipment and the
device being affected that are on different branch
(circuit breaker or fuse) circuits, or install AC line
filters.
In the case of 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 satisfac-
tory results, please contact your authorized Yamaha
professional products dealer for suggestions and/or
corrective measures.
If you cannot locate a franchised Yamaha professional
products dealer in your general area contact the pro-
fessional products Service Department, Yamaha Music
Corporation, 6600 Orangethorpe Ave., Buena Park,
CA 90620, U.S.A.
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 Communi-
cations Commission helpful:
"How to Identify and Resolve Radio —TV Interference
Problems". This booklet is available from the U.S.
Government Printing Office, Washington D.C. 20402
– Stock No. 004-000-00345-4.
YAMAHA
YAMAHA CORPORATION
P.O. Box 1, Hamamatsu. Japan
88 04 2.1 CR Printed in Japan