22 MODEL D User Manual
5.3 Oscillator Calibration
The oscillator calibration is done by following 3 main procedures: OSC1, OSC2, and
OSC3. Each procedure is slightly dierent. OSC1 is calibrated by referring to the
A-440 test tone, then OSC2 is calibrated against OSC1, and OSC3 is also calibrated
against OSC1.
This calibration does not require the computer or SysEx, or the Voltmeter. The
external keyboard is used, and adjustments are made to the various trimpots.
The PCB and the location of the trimpots is shown below.
OSC3 Scale Adjustment
OSC3 Range Adjustment
Octave Adjustment
OSC1 Scale Adjustment
OSC1 Range Adjustment
OSC2 Range Adjustment
OSC2 Scale Adjustment
Highest A5
Lowest A2
The diagram below shows the keyboard notes that are used in the calibrations.
Only A2, A5, and C6 are used.
A2 Low Value A5 High Value
Oscillator Calibration
C6 Octave Calibration
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