Yamaha MU80 Owner's Manual page 10

PRECAUTIONS
ELECTROMAGNETIC INTERFERENCE
Avoid using the unit near televisions, radios or other equipment generating
electromagnetic fields. Proximity to such equipment may cause the unit to
malfunction, and may generate interference noise in the other appliance as
well.
DO NOT OPEN THE CASE OR TRY REPAIRING THE INSTRUMENT
YOURSELF
The instrument contains no user-serviceable parts. Never open the case or
tamper with the internal circuitry in any way, since doing so may result in
damage to the instrument. Refer all servicing to qualified Yamaha service
personnel.
MIDI CABLES
When connecting the instrument to other MIDI equipment, be sure to use
only high-quality cables made especially for MIDI data transmission. Also,
avoid using cables longer than 15 meters, since long cables can result in
data errors.
Yamaha is not responsible for damage caused by improper han-
dling or operation.
viii