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10) Voice Pitch Tuning
Here's where the fun really starts. Center the master tuning controls VR1 (Adj Center), VR2 (Tune High), VR3 (Tune Low), VR14 (D#4-E4 Adj), VR15 (Tune
Mid) and the tuning knob on the front panel. VR14 is not present in the early production models and VR15 (Tune Mid) is mounted on the KLM-396 daughter
board.
Set Octave to 4' and all other controls at the normal settings. Set the slide switch between VR1 and VR2 so that it is towards the rear of the P6 (away from
CN12). This is the 'normal' tuning position. The other position is for stretch tuning.
a) Play C5 (second top C) and adjust VR11 (next to the blue arrow for each voice) to obtain C7 0 cents. Repeat for all voices. If any of the voices are outside
the trim range then adjust VR2 which will adjust all the voices. This will require all the voices to be redone.
b) Play C2 (second lowest C) and adjust VR1 (next to the switch) to obtain 0 cents. Do this for one voice only. VR1 should be close to the center position, if it
is out of range try a combination of VR1 & VR15.
c) Set Octave to 16' and play C2. Adjust VR10 (next to VR11) to obtain 0 cents. Repeat for all voices. VR3 is used to correct deviation in all voices
d) check other octaves. If they are out of tune you will need to try adjusting VR14 (D#4-E4 Adj) and VR15 (Tune Mid). Each time you adjust one of the master
settings (VR1, VR2, VR3, VR14, VR15) all the voices will be effected and you pretty much need to start from a) again.
Get things as close as you can and it will not be possible to get every voice tracking exactly over the full range as each voice has it's own oscillator, and after
all this is part of the Polysix analog charm and unique sound.
11) EG Time Adjust
Check CN05-12 (on the voice board) with the DVM and adjust the EG Attack control to as close to +0.9v as possible. Set Sustain to 0. Leave other controls
at the normal setting. Connect the oscilloscope to the end nearest the rear of the p6 of R143 (next to IC35 that is between each voice pair). Set Arpeggio to
on, Arpeggio speed to 2.5, Hold on and Unison on. Play any single key and adjust VR12 to obtain an attack time of 250mS ±10mS. Repeat for each voice.
The SW1 switch can be left at the rear position for normal tuning or set to the forward position for stretch tuning.
5) KLM-368 Adjustments
1) Headphone Amp Offset
Use normal settings. Connect a DVM to TP-4 (GND is TP-6). Adjust VR6 to obtain offset of 0mV (± 20mV)
2) Headphone Amp Level
Set Octave to 4'. Connect oscilloscope to TP-4. Play C3 and adjust VR5 to set sawtooth waveform to amplitude of 0.3V p-p (± 5%)
3) Output Amp Offset Adjustment
Set Waveform to PW and PW/PWM to 10, MG Frequency to 7, MG Level to 10 and MG MOD to VCA. Check SIG OUT (TP5) with the oscilloscope. Adjust VR7
to minimize waveform amplitude (less than 0.2v peak to peak).
4) Output Level Adjustment
Set Octave to 4' with other settings at normal. Play C3 and adjust VR8 to obtain an output of 3v Peak to Peak at SIG OUT (TP5) (±5%).
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KiwiSix Upgrade User Manual v3
