[. . . ] CAUTION Read these notes before proceeding These servicing instructions are for use by qualified personnel only. [. . . ] Hold the chassis (top & Bottom) tightly and turn the instrument the right way up, lift off the top chassis as shown in the figure with care without forcing or disconnecting the cables. These operations are valid for the 1st version keyboards, recognized by the codes shown on the label on the back panel of the instrument, only the following codes are valid: 995155 - 995156 - 995157 -995158 are valid. - Fix the Vocal Processor Board [1] by means of the screw [7] to the support [B]. NOTE: The jumper J1 [F] must be set on A position if the buffer modules are installed, on B position if the SIMM dram modules are intalled. [. . . ] NOTE: The jumper J1 [F] must be set on A position if the buffer modules are installed, on B position if the SIMM dram modules are intalled. [. . . ]