Calibration Procedure

This calibration is very easy to do. All that you need is a digital voltmeter capable of reading DC with an accuracy of
1mV. It is highly recommended to connect the voltmeter to a 1/8” plug. (best done by sacrificing a cable with 1/8” plug
at one end and using alligator clips to connect the voltmeter). Use 1/4” plug if NOVA-MOD was done :) A guitar
tuner or frequency counter is also needed.

1. Remove back panel of synth.

2. Adjust SH-101 knobs as follows.
Tune Pot in center position

VCO Mod slider at 0
Range at 8’

Pulse width at 0
Pulse waveform off
Ramp waveform at Max.
Sub-Osc waveform at 0
Noise at 0

Freq. at Max.
Res. at 0
Env at 0
Mod at 0
Kybd at Max.

VCA at Gate

Portamento at Off
Transpose at M
Volume at 10
VCO/VCF/MOD bender assignments at 0

3. Connect voltmeter to CV output jack. Measure DC voltage

4. Power up SH-101 while holding LOAD and KEY TRANSPOSE buttons down. (These LEDS should stay lit)

5. Voltmeter will now read approx. 0.000V. Adjust VR-2 on Synth Board to achieve 0.000V.

6. Press PLAY button.

7. Voltmeter will now read approx. 2.750V. Adjust VR-1 on Synth Board to achieve 2.750V.

8. Press ARPEGGIO DOWN button.

9. Voltmeter will now read approx. 2.500V. Adjust VR-3 on Synth Board to achieve 2.500V

10. Repeat steps 5-9 until all measurements are within 1mV. (note, you can press the LOAD button to return to the
state required for step 5 rather than re-powering.

11. De-power the Synth.

12. Re-power the synth and connect a guitar tuner or frequency counter to its output.

13. Alternate playing the lowest key (F3) and highest key (F5). while looking at the tuner/counter.

14. Adjust VR-6 until both notes are exactly 2 octaves apart. VR-6 adjusts the frequency spacing (width) between the
two notes. It should be exactly 2 octaves however VR-6 can make it greater or less that this amount. If you have
good ears, you may be able to adjust VR-6 without an instrument. (use keys G3 and G4 if you use a guitar tuner
that reads only EADGBE notes) Note :you may have to adjust VR-7 slightly to retune. Unfortunately VR-6
adjusts the width AND the overall tuning. TIP: Play the lowest note and set it to reference point using VR-7 (i.e.
G3 for the guitar tuner) Next press the G4 key and note where it sounds. If it is too high, then adjust VR-6 so that
the G4 note increases in pitch (YES INCREASES). Next, play G3 again and adjust VR-7 to re-center the guitar
tuner. Press G4 and see how close you have come. If G4 is too low then lower the pitch through VR-6. Repeat
this until You get your octave spacing.

15. Press an A key and adjust VR7 until the guitar tuner is centered on A (221/442/884 on a counter).

16. Repeat 14 and 15 until happy or crazy. (Actually SH-101’s are easy compared to Moogs!!!)

17. De-power the Synth

18. Re-power again holding the TRANSPOSE and LOAD keys.

19. Press the U&D button then press the UP button. Adjust VR-5 until the output is at the same pitch for each button.

20. De-power then re-power synth.

21. Adjust sliders so that:
all waveforms and noise levels are 0.
Res. is at Max.
VCF Env and VCF Mod are 0
Cutoff is approx. 8 (adjust so that a tone is hear from the self oscillation of the filter)

22. Alternately play two notes exactly 1 octave apart.

23. Adjust VR-8 until the two notes played sound 1 octave apart. Use a freq. counter or tuner or ear to measure.

24. Measure the DC voltage across the two test points on the Bender Board. (The test points are the wires accessed
through the two holes drilled in the circuit board.) Adjust VR-3 on the bender board for a 0.000V dc reading.