Boss Dr.Rhythm DR-550 Owner's Manual page 7

[Maintenance]
6 For everyday cleaning, wipe the unit with a soft dry cloth, orone that is dampened slightly.
То remove dirt that is more stubborn, wipe using a mild, neutral detergent. Afterwards,
make sure to wipe thoroughly with a soft cioth.
€ Never apply benzene, thinners, alcohol or any like agents, to avoid the risk of discoloration
and deformation.
[Concerning memory backup]
@ The unit's battery is needed not only for ordinary operation, but also serves in maintaining
the contents of memory while power is off. When the battery gets low, you risk losing the
data you have in memory. To be safe, change the battery ahead of time.
@ Please be aware that the contents of memory may at times be lost; when sent for repairs
or when by some chance a malfunction has occurred. Important data should be saved on
Audio Cassette Tape, or written down on paper. During repairs, due care is taken to avoid
the loss of data, however, in certain cases, such as when circuitry related to memory itself
is out of order, we regret that it may be impossible to restore the data.
[Changing Batteries]
@ Do not mix batteries when using them. Avoid using new ones together with used ones,
or a mixture of different types.
€ Carefully check that the - and + terminals are aligned properly when inserting batteries.
@ When changing batteries, if you leave power to the uniton, by means of an AC adaptor, they
can be changed without loss of data in memory.
@ Whenever the unitis not going to be used for an extended period of time, save the contents
of memory onto Audio Cassette Tape, and remove the batteries.
Ф When operated solely on batteries, and the batteries become depleted, the diplay of
the Pad Bank will blink. If this happens, replacee the batteries immediately.
[Other Precautions]
@ Protect the unit from strong impact.
€ Avoid getting any foreign objects (coins, wire, etc.), or liquids (water, drinks, etc.) into
the unit.
@ Never apply strong pressure to the display, or strike it in any way.