Filter
Top Products
NOTE FOR SYNTHESIZERS SOLD BY THE U.S.A.
Internally, the DX7 generates signals in the radio frequency spectrum. If the instrument is installed
in the immediate proximity of some types of audio or video devices (within ten feet), interference
may occur.
Federal Communications Commission (FCC) Rule Part 15, Subpart J, establishes design and
manufacturing standards that will provide a reasonable level of protection against the possibility
that two electronic devices, operating simultaneously, might interfere with each other.
The DX7 has been type tested and found to be in compliance with the design and manufacturing
standards established for "Class B" computing devices. Compliance with the standards established
by the FCC does not guarantee that interference will be eliminated. If your instrument is suspected
of causing interference with other electronic devices, verification can be made by turning your
instrument on and off. If the interference continues when your instrument is off, the instrument is
not the source of the interference. If your instrument does indeed appear to be the source of the
interference, one or more of the following corrective measures should be tried.
(1) Relocate either the instrument or the electronic device that is being affected by the interference.
(2) Utilize power outlets for the instrument and the device being affected that are on different branch
circuits (different circuit breakers or fuses), or install AC line filters.
(3) In the case of radio or TV interference, relocate the antenna; if the antenna lead-in wire is 300
ohm ribbon lead, change it to 75 ohm co-axial type cable (utilizing the necessary transformer/
adaptors at either end, as required to match the cable).
If these corrective measures do not produce satisfactory results, please ask for suggestions or
seek corrective measures by contacting your Authorized Yamaha Dealer or:
Music Marketing Group
Service Division
Yamaha International Corporation
6600 Orangethorpe Avenue
P.O.
Box
6600
Buena Park, CA 90622
If, for any reason, you should need additional information relating to radio or TV interference, you
may find helpful a booklet prepared by the FCC: "How to Identify and Resolve Radio-TV Interference
Problems." This booklet, (stock number 004-000-00345-4) is available from:
U.S. Government Printing Office
Washington, DC 20402
2