Roland SERVICE INFORMATION NO 100206-2

                                     JP-6
    
                                   
                The cause and countermeasure :

                The cause is that LFO output always jump into VCA circuit
                directly because LFO circuit is very near to VCA circuit on the
                printed circuit board. The countermeasure is to make a reasonable
                distance between VCA and LFO circuits on the board, and detail of
                solution has been shown in JP-6 service manual (at page 11).
          
          NOTE : This modification has already been carried out on JP-6 from
               the serial number 301700, and this countermeasure is effective
               on JP-6 with serial numbers from 250100 to 301699.