← Repair Guides|Oscillator Tuning Procedure (Serial Numbers 10175 and Above)
Easy10 min

Oscillator Tuning Procedure (Serial Numbers 10175 and Above)

Symptoms this guide addresses

  • Oscillators out of tune
  • Scale and tracking problems
  1. Set front panel controls as specified in Figure 5-4. Ensure Pitch Wheel is centered.
  2. Turn Power ON and allow a 30 minute warm-up period.
  3. Scale Trimpot Adjustment:
    • Set Octave Range to 8'.
    • Press low A (55Hz) and zero beat with the Shift trimpot.
    • Press high A (440Hz) and zero beat with the Scale trimpot.
    • Repeat until both notes zero beat.
  4. High End Compensation:
    • Set Octave Range to 2'.
    • Press low A (440Hz) and zero beat with Shift trimpot.
    • Press high A (3520Hz) and zero beat with High End trimpot.
    • Repeat until both notes zero beat.
  5. Octave Adjustment:
    • Set Octave Range to 32'. Press high A (220Hz) and zero beat using Shift trimpot.
    • Set Octave Range to 2'. Press high A (3520Hz) and zero beat using Octave trimpot.
  6. Final Shift Adjustment:
    • Set Octave Range to 2'. Press low A (440Hz) and adjust Shift trimpot for zero beat.

Source: MINIMOOG — minimoogservicemanual (manual)