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YAMAHA
STRINGS
SS-30
RACK-MOUNTED WITH MIDI
MIDI STRINGS

Project Tasks

  1. Power up and check supply - Done, okay. 
  2. G Boards recondition.
    1. Broken connections fixed
    2. Problem with G3 oscillator output traced to capacitor mod
    3. G1 and G2 keying drive wires reconnected
  3. K board recondition.
    1. Strip ends and tidy all keying switch wires
    2. Remove key mechanisms from their PCBs
    3. Attach key switch wires back to key PCBs 
  4. Tone Check 
    1. Switch each key wire to ground and check for tone out on each G board
  5. Mock-up Front-panel
    1. Reconnect all knobs and switches
  6. Check all controls and output
    1. Semi functional SS30
  7. Measure +15V rail current 
    1. Is there enough left for the MIDI interface?
  8. Select second PSU?
  9. Connect up the MIDI interface and check drive lines
  10. Evaluate relays
  11. Decide on PCB solution for the relays.
  12. Fit MIDI interface and relays.
    1. Functional SS30-M
  13. Additional features???
    1. Chorus input
    2. Orchestra Speed variable (not just slow or fast).
    3. Orchestra LFO waveform - saw instead of sine?
    4. Orch LFO input or CV control
    5. Voltage control of pitch (1V/Oct?) (and detune!????) (anything else?)
    6. Independent control of both pitches, not just detune (and CV on both?)
  14. PSU case enclosure and cable
  15. Drill and fit the rear panel components
  16. Design front-panel
  17. Fit front-panel
  18. SS30-M complete

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