Synthesizers and Samplers
POLY D
Analog 4-Voice Polyphonic Synthesizer with
37 Full-Size Keys, 4 VCOs, Classic Ladder Filter,
LFO, BBD Stereo Chorus, Distortion, 32-Step
Sequencer and Arpeggiator
User Support Bulletin
Introduction
The unit is carefully calibrated at the factory. The performance may change over time or due to environmental changes,
and the following recalibration procedures can be used to bring it back to its factory settings. If you do not feel comfortable
doing these calibrations, then we recommend they are done by an experienced audio service technician. This is especially true
for those units that need to be opened to gain access to voltage test points and calibration potentiometers.
CAUTION: Incorrect calibration or damage to the delicate adjustment potentiometers may lead to the unit
becoming inoperable.
Note: Although re-calibration will not invalidate the warranty, any damage caused during re-calibration may invalidate
the warranty.
Equipment required
1. Guitar tuner
2. Small insulated trimmer screwdriver
985-40000-01085 Rev.A
2021-02-16
Condential, for internal use only. Not to be reproduced.
page 1 of 5
Synthesizers and Samplers
POLY D
Calibration Procedure
Follow all steps in the order in which they are presented.
Make sure the POLY D has been powered on for more than 30 minutes, and that it is in a place where the temperature
will not change drastically while performing the calibration.
Initial Settings:
• TUNE, OSCILLATOR-2, OSCILLATOR-3, OSCILLATOR-4 to middle position
• RANGE set to 8'
• WAVEFORM triangle waveform
• OSC volume turn to 10
• CUTOFF FREQUENCY set to maximum
• EMPHASIS set to 0
• AMOUNT OF CONTOUR set to 0
• SUSTAIN of Loudness contour set to 10
• MODE set to MONO
• OSCILLATOR MODULATION turn to left side
• OSC4 CONTROL turn up
Connect a guitar tuner to the main output L or R jack.
OSC1 Range and Scale Calibration
The back panel of the POLY D has various trim pots that are accessible using an insulated trim screwdriver.
985-40000-01085 Rev.A
2021-02-16
Condential, for internal use only. Not to be reproduced.
page 2 of 5
page 2 of 5
Loading...