Roland SERVICE INFORMATION NO 100206-1

                                     JP-6
    
                                    SUBJECT
    
                        The countermeasure for LFO leakage
    
           This information is for solution to two kinds of LFO leakage
           problems on JP-6 which occurs in two different panel setting
           conditions as below :
    
           1.  LFO Leakage-A
               Panel setting and the phenomenon :
               An LFO leakage can be audible as a noise in synchronization at the
               LFO rate when some controls are set at the following positions
               (even when control "LFO" in VCA section is set at "O" position)
    
                        "RATE" in LFO-1 section        : "3"
                        "ENV-2 LEVEL" in VCA section   : "10"
                        "LFO" in VCA section           : "0"
    
    
               The cause and Countermeasure :
               This LFO leakage is caused among wires which are wired between CPU
               board and MODULE (2 VOICES)/ MODULE (4 VOICES) boards. Please
               separate a bundle of the wires into two bundles to eliminate the
               LFO leakage. Please refer to the attached drawing.
         NOTE: The above modification has already been taken to JP-6 from the
               serial number 280950. Accordingly, this modification is effective
               on JP-6 with serial numbers from 250100 to 280949.
    
           2.  LFO leakage-B
               Panel setting and phenomenon :
               An LFO leakage like clock occurs when the following controls are 
               set at the following points :
    
                       "RATE" in LF0-1 section        :  "3"
                       "WAVEFORM" in LF0-1 section    :  SQUARE
                       "ENV-2" LEVEL" in VCA section  :  "10"
                       "LFO" in VCA section           :  "10"