Marantz RC1200 - Manual (Page 9)

ENGLISH
LOADING BATTERIES
The life of the batteries used with the remote
control unit is about 6 months with normal use.
Also be sure to replace batteries earlier when
you notice that they are getting weak. Do not
use alkaline, manganese, nickel-cadmium (Ni-
Cd) or other different types of batteries
together.
(1) Remove the back cover.
(2) Insert the new batteries (AA type) with
correct (+) and (–) polarity.
(3) Close until it clicks.