Behringer MODEL D User Manual page 24

24
MODEL D User Manual
5.4 Octave Range Calibration
The octave calibration ensures that the OSC1 and OSC2 Octave RANGE knobs are
in tune with each other. This calibration is done after the oscillator calibration.
1. Make sure that the preliminary procedures shown in section 5.1 have been
followed, and the MODEL D front panel controls and switches are set as
directed.
2. Turn OFF the A-440 switch, and keep the OSC1 VOLUME switch ON.
3. On the PCB, locate the OSC SW pot.
4. Turn all the Octave RANGE knobs to the 2' position in the OSCILLATOR BANK
section.
RANGE
Highest C6
Octave Adjustment
5. Turn on the front panel OSC2 VOLUME switch in the MIXER section. (OSC1 is
already on, OSC1 and 2 Volumes are up).
OSC1 ON
OSC1 Max
OSC2 Max
OSC2 ON
Highest A5
Lowest A2
6. On your external keyboard, press and hold the C6 key. You should hear both
OSC3 Scale Adjustment
OSC1 and OSC2. Adjust the headphone volume or main volume as required.
7. Listen carefully, and adjust the front panel OSCILLATOR-2 Tune knob until
OSC3 Range Adjustment
there are zero beats between OSC1 and OSC2.
OSC2 Scale Adjustment
TUNE
OSC2 Range Adjustment
OSC1 Scale Adjustment
8. Turn the front panel OSC2 Octave RANGE knob to the 8' position.
OSC1 Range Adjustment
RANGE
8'