4. VCO2 Pitch Adjustment (adjust trim pots and check the pitch with the tuner)
(Wait for 8 minutes or more after turning the power on before start adjustments.)
Set the PITCH knob to its center position (0)
Set the MASTER TUNE knob to its center position (0)
[SIGNAL_OUT <=> Tuner]
Set the WAVEFORM to the Rectangular, and the SCALE to 8'
On the VCO MIXER, set the VCO1 LEVEL to 0, and VCO2 LEVEL to 10
Connect the tuner to the SIGNAL_OUT (with the Master Volume to its maximum position)
a) Press the C3 key (the leftmost C key), and adjust the trim pot PT4 to get 130.81Hz
(130.74Hz - 130.88Hz, C3 +/- 1cent)
b) Press the C6 key (the rightmost C key), and adjust the trim pot PT5 to get 1046.5Hz
(1045.9Hz - 1047.1Hz, C6 +/- 1cent)
Repeat these adjustments a) and b) to make both frequencies are within these ranges.
Connect the TRIG OUT and INITIAL GAIN with a patch cable
Apply +3.000V to the VCO 1+2 CV IN (V/Oct) JACK (Don't press keys on the external MIDI keyboard)
Adjust the trim pot PT19 to get 1046.5 Hz (1045.9Hz - 1047.1Hz, +/- 1cent)
Apply +1.000V to the VCO 1+2 CV IN (V/Oct) JACK
Confirm the frequency is within the range C4 +/- 2.5cent (Don't press keys on the external MIDI keyboard)
Apply +2.000V to the VCO 1+2 CV IN (V/Oct) JACK
Confirm the frequency is within the range C5 +/- 2.5cent (Don't press keys on the external MIDI keyboard)
Remove the patch cable between the TRIG OUT and INITIAL GAIN
5. After confirming these, set all the knobs to the standard setting.
This concludes the adjustment procedure.
MS-20M Kit Pitch Adjustment Procedure
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MS-20M Kit
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